bicycle drive unit

Abstract

Bicycle drive unit (10), comprising: a crankshaft (14, 114, 214, 314) rotatable about a first axis of rotation (X1); a motor (30, 230, 330) having an output shaft (30c, 230c, 330c) rotatable about a second axis of rotation (X2); a driven element (32, 132, 232, 332) rotatable about the first axis of rotation (X1) in a first direction of rotation, while the crankshaft (14, 114, 214, 314) rotates about the first axis of rotation (X1) in the first direction of rotation;and a torque combination mechanism (36, 136, 236, 336) that effectively couples the output shaft (30c, 230c, 330c) of the motor (30, 230, 330) to the output element (32, 132, 232, 332) in order to transmit the rotation of the output shaft (30c, 230c, 330c) of the motor (30, 230, 330) to the output element (32, 132, 232, 332), wherein the torque combination mechanism (36, 136, 236, 336) is configured to effectively couple the output shaft (30c, 230c, 330c) of the motor (30, 230, 330) from the output element (32, 132, 232, 332) to separate in order to prevent the rotation of the crankshaft (14, 114, 214, 314) from being transferred to the output shaft (30c, 230c, 330c) of the engine (30, 230, 330) while the crankshaft (14, 114, 214, 314) rotates about the first axis of rotation (X1) in a second direction of rotation which is opposite to the first direction of rotation;wherein the output element (32, 132, 232, 332) is rotatable about the first axis of rotation (X1) in the second direction of rotation, while the crankshaft (14, 114, 214, 314) rotates about the first axis of rotation (X1) in the second direction of rotation.

Description

Background / Area of ​​the invention

[0001] The present invention relates generally to a bicycle drive unit. In particular, the present invention relates to a drive unit for an electrically assisted bicycle. Background information

[0002] A conventional coaster brake is known to be fitted to a bicycle (see, for example, European patent application no. 2 380 806 A2 (patent document 1) and Japanese patent no. 4959858 (patent document 2)). Generally, a bicycle crank arm and a front sprocket are fixedly coupled to each other. The coaster brake is mounted on a rear bicycle hub and effectively coupled to the front sprocket. When the bicycle crank arm is turned in a reverse direction, the coaster brake is thus applied.

[0003] On the other hand, an electrically assisted bicycle is conventionally known that uses motor power as a support force (see, for example, Japanese patent application no. H08-310478 (patent reference 3)). In the electrically assisted bicycle, after a pedaling force initiated by means of the pedals is transmitted and the transmitted driving force is combined with a driving force from the motor, the combined driving force is transmitted to the rear wheel, causing the rear wheel to rotate. SUMMARY

[0004] It has been discovered that a coaster brake can be applied to more than just electrically assisted bicycles. Specifically, patent document 3 discloses a freewheel clutch arranged between a crank arm and a front sprocket. The freewheel clutch prevents the crank arm from rotating in response to the rotation of an electric motor. However, it was found that when the crank arm is rotated in the reverse direction, the front sprocket does not rotate. Therefore, even when the coaster brake is applied to an electrically assisted bicycle, it cannot be engaged.

[0005] One aspect is to provide a bicycle drive unit that can be used with a bicycle coaster brake.

[0006] From a first perspective, a bicycle drive unit comprises a crankshaft, a motor, a driven element, and a torque-combining mechanism. The crankshaft is rotatable about a first axis of rotation. The motor has an output shaft (which can also be called the output shaft) that is rotatable about a second axis of rotation. The driven element rotates about the first axis of rotation in a first direction, while the crankshaft rotates about the first axis of rotation in the first direction. The torque-combining mechanism effectively couples the motor's output shaft to the driven element to transmit the rotation of the motor's output shaft to the driven element.The torque combination mechanism is designed to effectively disconnect the engine's output shaft from the output element, preventing the crankshaft's rotation from being transmitted to the engine's output shaft while the crankshaft rotates around its primary axis in a second direction. This second direction of rotation is opposite to the first.

[0007] According to a second aspect, in the bicycle drive unit, the output element is rotatable relative to the crankshaft, in accordance with the first aspect.

[0008] According to a third aspect, in the bicycle drive unit, according to the first or second aspect, the output element is rotatable around the first axis of rotation in the second direction of rotation, while the crankshaft rotates around the first axis of rotation in the second direction of rotation.

[0009] According to a fourth aspect, in the bicycle drive unit, the output element is designed to be attached to a front chainring, in accordance with one of the first to third aspects.

[0010] According to a fifth aspect, in the bicycle drive unit, as defined in the first through fourth aspects, the torque combination mechanism includes a freewheel clutch effectively arranged between the motor's output shaft and the driven element. The freewheel clutch effectively couples the motor's output shaft to the driven element while the crankshaft rotates about its first axis in the first direction. The freewheel clutch effectively disconnects the motor's output shaft from the driven element to prevent the rotation of the crankshaft from being transmitted to the motor's output shaft while the crankshaft rotates about its first axis in the second direction.

[0011] According to a sixth aspect, in the bicycle drive unit, the torque combination mechanism, as defined in the first to fifth aspects, comprises a torque transmission part that is rotatable about the first axis of rotation. The torque transmission part is effectively coupled to the output shaft of the motor.

[0012] According to a seventh aspect, in the bicycle drive unit according to the fifth or sixth aspect, the freewheel clutch comprises an engagement pawl that is pivotably arranged between a release position and an engagement position. The engagement pawl is configured to engage with a toothed section of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the first direction. The engagement pawl is configured to disengage from the toothed section of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the second direction.

[0013] According to an eighth aspect, the freewheel clutch in the bicycle drive unit, according to the seventh aspect, further includes a preload element that preloads the pawl to the engagement position.

[0014] According to a ninth aspect, in the bicycle drive unit, according to one of the fifth to eighth aspects, the freewheel clutch comprises an engagement element that is pivotably arranged between a release position and an engagement position. The engagement element is configured to engage frictionally with an inner edge surface of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the first direction. The engagement element is configured to be released, at least frictionally, from the inner edge surface of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the second direction.

[0015] According to a tenth aspect, the freewheel clutch in the bicycle drive unit, according to the ninth aspect, further comprises a preload element that preloads the engagement element to the release position.

[0016] According to an eleventh aspect, the bicycle drive unit further comprises a control part designed to move the engagement element to the engagement position while the crankshaft rotates about the first axis of rotation in the first direction of rotation.

[0017] According to a twelfth aspect, the bicycle drive unit, according to one of the first to eleventh aspects, further comprises a contact part designed to transmit the rotation of the crankshaft to the output element while the crankshaft rotates about the first axis of rotation in the second direction of rotation.

[0018] According to a thirteenth aspect, in the bicycle drive unit according to the seventh aspect, the freewheel clutch further comprises a preload element that preloads the pawl to the engagement position.

[0019] According to a fourteenth aspect, the bicycle drive unit further comprises a control part designed to move the engagement pawl to the release position while the crankshaft rotates about the first axis of rotation in the second direction of rotation.

[0020] According to a fifteenth aspect, in the bicycle drive unit, according to the fourteenth aspect, the control part has a contact surface which contacts an inner surface of a recess part of the output element in the circumferential direction in order to transmit the rotation of the crankshaft to the output element while the crankshaft rotates about the first axis of rotation in the second direction of rotation.

[0021] According to a sixteenth aspect, in the bicycle drive unit, according to one of the seventh to fifteenth aspects, the toothed section is arranged on an inner edge surface of the torque transmission part of the torque combination mechanism.

[0022] According to a seventeenth aspect, in the bicycle drive unit, according to one of the seventh to fifteenth aspects, the toothed section is arranged on an outer edge surface of the torque transmission part of the torque combination mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Reference is now made to the attached drawings, which form part of this original revelation:

[0024] Fig. Figure 1 is a side view of a drive train of an electrically assisted bicycle equipped with a drive unit according to a first embodiment;

[0025] Fig. Figure 2 is a cross-sectional view of the drive unit according to the first embodiment;

[0026] Fig. 3A is an enlarged cross-sectional view of a coupling mechanism located in Fig. 2 drive unit shown along line III-III in Fig. 2, showing an engagement latch that has been moved towards a release position of the engagement latch;

[0027] Fig. 3B is an enlarged cross-sectional view of the coupling mechanism of the in Fig. 2 drive unit shown along line III-III in Fig. 2, showing the engagement latch that has been moved towards an engagement position of the engagement latch;

[0028] Fig. 4A is a cross-sectional view of the coupling mechanism of the in Fig. 2 drive unit shown along line IV-IV in Fig. 2, showing the engagement pawl that has been moved towards the release position of the engagement pawl;

[0029] Fig. 4B is a cross-sectional view of the coupling mechanism of the in Fig. 2 drive unit shown along line IV-IV in Fig. 2, showing the engagement latch that has been moved towards the engagement position of the engagement latch;

[0030] Fig. Figure 5A is a cross-sectional view of a modified coupling mechanism of the drive unit according to the first embodiment, showing an engagement pawl that has been moved towards an engagement position of the engagement pawl;

[0031] Fig. 5B is a cross-sectional view of the in Fig. 5A shows the modified coupling mechanism, which shows the engagement pawl being moved towards a release position of the engagement pawl;

[0032] Fig. Figure 6 is a cross-sectional view of a drive unit according to a second embodiment;

[0033] Fig. 7A is an enlarged partial cross-sectional view of a coupling mechanism located in Fig. 6 drive unit shown, which shows an engagement pawl that has been moved towards an engagement position of the engagement pawl;

[0034] Fig. 7B is an enlarged partial cross-sectional view of the coupling mechanism of the in Fig. 6 drive unit shown, which shows the engagement pawl being moved towards a release position of the engagement pawl;

[0035] Fig. Figure 8 is a cross-sectional view of a drive unit according to a third embodiment;

[0036] Fig. 9A is an enlarged partial cross-sectional view of a coupling mechanism located in Fig. 8 drive unit shown, which shows an engagement pawl that has been moved towards an engagement position of the engagement pawl; and

[0037] Fig. 9B is an enlarged partial cross-sectional view of the coupling mechanism of the in Fig. 8 shown drive unit, which shows the engagement pawl being moved towards a release position of the engagement pawl. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0038] Selected embodiments will now be explained with reference to the accompanying drawings. It will be clear to those skilled in the art from this disclosure that the following descriptions of the embodiments are provided for illustrative purposes only and not for the purpose of limiting the invention as described by the appended claims and their equivalents.

[0039] Initially referring to the Fig. 1 and Fig. 2 becomes a drive unit 10 (e.g., a bicycle drive unit) according to a first embodiment. As shown in Fig. As shown in 1, the drive unit 10 on a drivetrain 11 arranged in the embodiment shown. Fig. 1 only sections that include the drivetrain 11of the electrically assisted bicycle, as other sections of the electrically assisted bicycle may be conventional. Therefore, for the sake of brevity, a detailed description of the electrically assisted bicycle is omitted. As in Fig. As shown in 1, the drivetrain includes 11 Essentially a pair of pedals 100 , a pair of crank arms 101 , the drive unit 10 , a first chain 102 , a rear sprocket 103 and a rear hub 104 The pedals 100 are rotatable at the free ends of the crank arms 101 Assembled. The inner ends of the crank arms 101 are located at opposite ends of a crankshaft 14 (see Fig. 2) the drive unit 10 fixed. The first chain 102 is effective between the drive unit 10 and the rear sprocket 103 connected. For the powertrain 11The electrically assisted bicycle generates a pedaling force that is applied to the pedals. 100 acts on the rear hub 104 transmitted, which are rotatable with a rear hub axle 105 is coupled to rotate a rear wheel (not shown) of the electrically assisted bicycle via the following transmission path: the crank arms 101 → the drive unit 10 → the first chain 102 → the rear sprocket 103 → the rear hub 104 . When transmitting the pedaling force, the drive unit builds 10 A motor output torque is used as an assist force to support the pedaling force. In the illustrated embodiment, when a pedaling force greater than a prescribed threshold is detected, the motor output torque corresponding to the pedaling force is generated as the assist force. The drive unit 10It is typically located near a connecting section between a seat tube (not shown) and a down tube (not shown) of a bicycle frame. A battery for the drive unit. 10 is positioned along a rear support, the down tube, or the seat tube.

[0040] In the embodiment shown, the rear hub 104 with a coaster brake 104a equipped with a coaster brake. 104a is activated to shift via the rear hub 104 as a reaction to a backward rotation of the crank arms 101 to generate a braking force on the rear wheel. In the illustrated embodiment, the coaster brake is used in particular. 104a the rear hub 104 as a reaction to a backward rotation of the crank arms 101 via the drive unit 10 , the first chain 102 and the rear sprocket 103The brake was activated. Since coaster brakes are conventionally well-known, a detailed description is omitted for the sake of brevity.

[0041] As in Fig. As shown in 1, the drive unit 10 near the crank arms 101 arranged. In the embodiment shown, as in Fig. As shown in section 2, the drive unit 10 a case 12 , the crankshaft 14 , a first rotary transmission element 16 , an intermediate axis 18 , a second rotary transmission element 20 , a third rotary transmission element 26 and a front sprocket 28 (e.g., a front sprocket). In the illustrated embodiment, the crankshaft 14 and the intermediate axis 18 arranged so that they extend parallel to each other at distanced locations. As in Fig. 2 shown, the drive unit 10 an engine30 , a driven element 32 and a torque combination mechanism 36 with a freewheel clutch 38 on. Thus, the bicycle drive unit includes 10 the crankshaft 14 , the engine 30 , the output element 32 and the torque combination mechanism 36 .

[0042] As in Fig. As shown in section 2, the case houses 12 the first rotary transmission element 16 , the second rotary transmission element 20 , the third rotary transmission element 26 , the engine 30 , the output element 32 and the torque combination mechanism 36 with the freewheel clutch 38 .

[0043] The case 12 is an element made of, for example, aluminum or another metal. However, part or all of the housing may be 12 also made of a synthetic resin. The casing12 a first side panel 12a and a second side panel 12b open. The first side panel 12a and the second side panel 12b are formed independently of each other as separate parts, and are aligned with each other in an axial direction of the crankshaft 14 Facing the first side panel 12a and the second side panel 12b are detachably coupled to each other in a conventional manner to create a receiving space for receiving the first rotary transmission element. 16 , of the second rotary transmission element 20 , of the third rotary transmission element 26 , of the engine 30 , of the drive element 32 and the torque combination mechanism 36 with the freewheel clutch 38 to form.

[0044] The crankshaft 14 The crankshaft is a metallic axle component, made of materials such as iron, stainless steel, or similar. 14The crankshaft is rotatable about a first axis of rotation X1. 14 is regarding the housing 12 through a first, second and third camp 45a , 45b and 45c , such as ball bearings, are mounted. The first bearing 45a is radial between the first side part 12a and the crankshaft 14 in the opening of the first side panel 12a arranged. The second camp 45b is radial between the front sprocket 28 and the crankshaft 14 in a middle hole of a sleeve 28a of the front sprocket 28 arranged. The third camp 45c is radial between the second side part 12b and the front sprocket 28 on an outer edge surface of the sleeve 28a of the front sprocket 28 arranged. The two ends of the crankshaft 14 are arranged so that they emerge from the first side panel 12aor the second side panel 12b protrude. At the end sections of the crankshaft 14 are the crank arms 101 Each detachable and rotationally fixed to the crankshaft 14 coupled. In the final section of the crankshaft 14 on the side of the first side panel 12a the crankshaft 14 a toothed section for connection with the first rotary transmission element 16 The toothed section extends over the entire circumference in the circumferential direction of the crankshaft. 14 formed. Of course, the toothed section can alternatively be intermittent in the circumferential direction of the crankshaft. 14 be trained.

[0045] The first rotary transmission element 16 is rotationally fixed to the crankshaft 14 coupled, that the first rotary transmission element 16 the rotation of the crank arms 101 transmits. The first rotary transmission element 16It consists, for example, of a synthetic resin or a metal. The first rotary transmission element 16 is thus connected to the toothed section of the crankshaft 14 connected that the first rotary transmission element 16 and the crankshaft 14 They rotate together. Of course, the first rotary transmission element can 16 by press fit, joining or other suitable method of attachment to the crankshaft 14 to be attached. The first rotary transmission element 16 is essentially a tubular element with a flanged section 16a The formations of the first rotary transmission element 16 will be described in more detail later.

[0046] The intermediate axis 18 is an axle element made of, for example, iron, stainless steel, or another metal. The intermediate axle 18 has a first and a second terminal section 18a and18b up. The first and second final sections 18a and 18b They are each rotatable on the first and second side panels 12a and 12b supported by a pair of bearings, such as a ball bearing. The intermediate axle 18 the second rotary transmission element is mounted 20 rotatable.

[0047] The second rotary transmission element 20 is effective between the third rotary transmission element 26 and the torque combination mechanism 36 arranged. The second rotary transmission element 20 is an element that controls the rotation of the engine 30 to the torque combination mechanism 36 transmits. The second rotary transmission element 20 has a large gear 20a and a small gear 20b on, which has a smaller diameter than that of the large gear 20a features the large gear. 20a and the small gear 20bThese are elements made of materials such as synthetic resin or metal. The large gear 20a is on the intermediate axis 18 near the first end section 18a via a freewheel clutch 40 rotatably mounted. The freewheel clutch 40 only transmits the rotation of the motor 30 in one direction to assist the pedaling force during a forward rotation of the crank arms 101 In the embodiment shown, the freewheel clutch 40 designed as a roller clutch. Of course, in the illustrated embodiment, the freewheel clutch can be used. 40 between an output shaft 30c of the engine 30 and a third rotary transmission element 26 be arranged instead of between the intermediate axis 18 and the large gear 20a to be arranged. In this case, the large gear 20a fixed to the intermediate axle 18coupled. The small gear 20b is fixed to the intermediate axle 18 near the second end section 18b coupled.

[0048] The third rotary transmission element 26 is effective between the engine 30 and the second rotary transmission element 20 arranged. The third rotary transmission element 26 is an element that controls the rotation of the engine 30 to the second rotary transmission element 20 transmits. The third rotary transmission element 26 features an externally toothed gear 26a on, which is firmly attached to the output shaft 30c of the engine 30 is coupled. The gear 26a of the third rotary transmission element 26 is with the large gear 20a of the second rotary transmission element 20 in intervention.

[0049] The front sprocket 28It features a front bicycle sprocket with a conventional design. The front sprocket 28 is through the second camp 45b rotatable on the crankshaft 14 The front sprocket is mounted. 28 is through the third camp 45c also rotatable on the housing 12 The front sprocket is mounted. 28 is around the first axis of rotation X1 of the crankshaft 14 rotatable. Thus, the axis of rotation of the crankshaft 14 and the axis of rotation of the front pinion 28 together. In the illustrated embodiment, the front pinion is 28 integrally designed as a single, unified element. However, the front sprocket can of course be... 28 It can be made up of several separate parts. For example, the front pinion can be 28 a conventional spider with the sleeve 28aand include a conventional chainring attached to the spider in a conventional manner. The front sprocket 28 can be done at the output element 32 without crankshaft bearing 14 be fixed. The second bearing 45b can be between the output element 32 and the case 12 be arranged. The third camp 45c can be between the crankshaft 14 and the output element 32 be arranged.

[0050] The engine 30 is an internal rotor type motor. The motor 30 features a rotor 30a and a stator 30b up. Since the engine 30 Since it has a conventional design, a detailed description is omitted for the sake of brevity. The stator 30b is fixed to an inner side surface of the second side part 12b of the case 12 coupled. The engine 30The output shaft also shows 30c up. The rotor 30a is fixed to the output shaft 30c of the engine 30 coupled. The output shaft 30c is relative to the case 12 The output shaft is rotatably mounted on a pair of bearings. More precisely, the output shaft... 30c rotatable about a second axis of rotation X2. In the illustrated embodiment, the second axis of rotation X2 is arranged such that it extends parallel to the first axis of rotation X1 at spaced-apart locations.

[0051] In the embodiment shown, the gear 26a of the third rotary transmission element 26 fixed to a distal end of the output shaft 30c of the engine 30 coupled. The gear 26a is with the large gear 20a of the second rotary transmission element 20 in engagement. The large gear 20a is connected to the intermediate axis 18 via the freewheel clutch40 Rotatably coupled. The freewheel clutch 40 transmits only one rotary output of the motor 30 for the forward rotation of the front pinion 28 to the intermediate axle 18 The small gear 20b is fixed to the intermediate axle 18 coupled.

[0052] The output element 32 is a cylindrical element that extends axially along the first axis of rotation X1. The output element 32 has a first end section 32a , which selectively engages with the first rotary transmission element 16 is involved, and a second terminal section 32b up, which is rotationally fixed to the sleeve 28a of the front sprocket 28 is coupled. In other words, the output element is 32 formed, on the front sprocket 28 to be attached. Thus, the front sprocket rotates. 28 and the output element 32together. The output element 32 It also has a torque sensor 50 with a pair of magnetic deflection elements 50a and a pair of coils 50b on. The magnetic deflection elements 50a and the coils 50b are each facing each other. This is due to the torque sensor. 50 The detected torque is used to control the rotary output of the motor. 30 to control. Of course, experts will clearly understand from this revelation that the torque sensor 50 could be a different type of torque sensor.

[0053] The output element 32 It is rotatable on the crankshaft 14 It is mounted. More precisely, the output element is mounted. 32 relative to the crankshaft 14 rotatable. The output element 32 is rotatable about the first axis of rotation X1 in a forward direction of rotation (e.g. a first direction of rotation), while the crankshaft 14about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the output element 32 rotatable around the first axis of rotation X1 in a reverse direction of rotation (e.g. a second direction of rotation), while the crankshaft 14 about the first axis of rotation X1 in the reverse direction (e.g., the second direction of rotation). The reverse direction (e.g., the second direction of rotation) is opposite to the forward direction of rotation (e.g., the first direction of rotation). In particular, the output element 32 relative to the crankshaft 14 and the first rotary transmission element 16 rotatable within a limited range of relative rotation. More precisely, the output element is 32 with the first rotary transmission element 16 and the torque combination mechanism 36 in engagement, in order to align itself together with the first rotary transmission element 16and the torque combination mechanism 36 to rotate in the forward direction while the crankshaft 14 rotates in the forward direction. On the other hand, the output element 32 with the first rotary transmission element 16 in engagement, in order to align itself together with the first rotary transmission element 16 to rotate in a reverse direction (e.g. a second direction of rotation) while the crankshaft is rotating 14 rotates around the first axis of rotation X1 in the reverse direction. The design of the output element 32 will be described in detail later.

[0054] The torque combination mechanism 36 is effective between the engine 30 and the output element 32 arranged. The torque combination mechanism 36 couples the output shaft 30c of the engine 30 effective with the drive element 32 , to rotate the output shaft 30cof the engine 30 on the output element 32 to transmit. The torque combination mechanism 36 is formed, the output shaft 30c of the engine 30 effective from the drive element 32 to separate in order to prevent the rotation of the crankshaft 14 on the output shaft 30c of the engine 30 is transferred while the crankshaft 14 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0055] More precisely, the torque combination mechanism features 36 the freewheel clutch 38 The torque combination mechanism 36 It also features a torque transmission component. 42 up. The torque transmission part 42 It is rotatable about the first axis of rotation X1. The torque transmission part 42 is effective with the output shaft 30c of the engine 30coupled. More precisely, the torque transmission part. 42 on an outer edge surface 16b of the flange section 16a of the first rotary transmission element 16 It is rotatably mounted. Thus, the first rotary transmission element transmits 16 the rotation of the crankshaft 14 not directly connected to the torque transmission part 42 The torque transmission part 42 has an outer gear 46 on an outer edge surface of the torque transmission part 42 on. The outer gear 46 is with the small gear 20b of the second rotary transmission element 20 in engagement. Thus, the torque transmission component transmits 42 the rotation of the engine 30 The torque transmission part 42 is with the output element 32 via the freewheel clutch 38 rotatably mounted. The second rotary transmission element 20, the third rotary transmission element 26 and the torque transmission part 42 can form a reduction mechanism.

[0056] The freewheel clutch 38 is between an inner boundary surface 42a of the torque transmission part 42 and the first final section 32a of the output element 32 arranged.

[0057] In other words, the freewheel clutch 38 effective between the output shaft 30c of the engine 30 and the output element 32 arranged. The freewheel clutch 38 only transmits the rotation of the motor 30 to the output element 32 , while the crankshaft 14 rotates in the forward direction. The torque combination mechanism 36 combines the rotary output of the motor 30 , which is attached to the outer gear 46 of the torque transmission part 42is transmitted, and the rotary output of the crankshaft 14 , which is from the first rotary transmission element 16 via the freewheel clutch 38 is transmitted. More precisely, the freewheel clutch couples 38 the output shaft 30c of the engine 30 effective with the drive element 32 , while the crankshaft 14 about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the freewheel clutch disengages. 38 the output shaft 30c of the engine 30 effective from the drive element 32 , to prevent the rotation of the crankshaft 14 on the output shaft 30c of the engine 30 is transferred while the crankshaft 14 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0058] Referring to the Fig. 3A, Fig. 3B, Fig. 4A and Fig. 4B will now describe the construction of the freewheel clutch. 38 further described in detail. The freewheel clutch 38 includes an internally toothed section 60 , an access handle 64 and a pre-tensioning element 66 The freewheel clutch 38 It also includes a control unit. 68 .

[0059] The gear section 60 is on the inner edge surface 42a of the torque transmission part 42 arranged. The gear section 60 has a majority of surgical teeth 60a on, which are located on the inner edge surface 42a of the torque transmission part 42 are formed. The intervention teeth 60a indicate intervention areas 60b on, which selectively with the engagement latch 64 to intervene in order to stop the rotation of the engine 30 to the output element 32 to transfer.

[0060] The access handle 64 is at the first end section 32a of the output element 32 Swivel-mounted. The engagement latch. 64 is between a release position (see Fig. 3A and Fig. 4A) and an intervention position (see Fig. 3B and Fig. 4B) pivotally arranged. The engagement latch 64 is formed, with the gear section 60 to engage while the crankshaft is rotating 14 around the first axis of rotation X1 in the forward direction of rotation (e.g. the first direction of rotation or clockwise in the Fig. 3B and Fig. 4B) rotates. The engagement latch 64 is formed by the gear section 60 to be resolved while the crankshaft 14 around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation or counterclockwise in the Fig. 3A and Fig. 4A) rotates. In the embodiment shown, "releasing" the engagement pawl requires 64 from the gear section 60 not necessarily that the intervention handle 64 from the gear section 60 is spaced apart. Rather, this can mean that the intervention handle 64 over the gear section 60 slides while it passes through the gear section 60 touched. In this case, the intervention handle is 64 from the gear section 60 released to prevent the rotation of the crankshaft 14 on the output shaft 30c of the engine 30 is transferred while the crankshaft 14 about the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). However, it is preferred that the engagement pawl 64 mechanically from the friction engagement section 160is spaced to reduce mechanical loss when the crankshaft 14 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0061] The access handle 64 indicates the end of the intervention 64a , a storage end 64b and a controlling end 64c up. The end of the procedure. 64a is with the surgical teeth 60a of the gear section 60 during the procedure, while the operating handle is moving 64 at the intervention position. The end of the intervention. 64a is from the surgical teeth 60a of the gear section 60 released, while the engagement latch 64 at the release position. The engagement latch. 64 is on an outer edge surface 32c of the first end section 32a of the output element 32 It is mounted in a conventional, swiveling manner. For example, the bearing end is64b the intervention handle 64 pivotably coupled to a pivot pin, which is attached to the first end section 32a of the output element 32 is arranged. The controlling end 64c protrudes axially from the end of the intervention 64a the intervention handle 64 The controlling end 64c is controlled by the control unit 68 actuated in such a way that the engagement latch 64 pivots between the release position and the engagement position. In the illustrated embodiment, the freewheel clutch comprises 38 a single access handle 64 However, experts will clearly understand from this revelation that the freewheel clutch 38 includes a number of interventional clinics.

[0062] The pretensioning element 66 tensions the engagement latch 64 towards the engagement position. The preload element 66It essentially comprises a latch spring that effectively engages the pawl. 64 and the output element 32 is arranged. In the embodiment shown, the freewheel clutch comprises 38 a single prestressing element 66 However, experts will clearly understand from this revelation that the freewheel clutch 38 comprises a plurality of prestressing elements, which correspond to a plurality of engagement pawls.

[0063] The control unit 68 is on an inner boundary surface 16c of the flange section 16a of the first rotary transmission element 16 arranged. More precisely, the control unit has 68 a cut-out section 71 with a sloping surface 71a open. The exclusion section 71 is in the inner boundary surface 16c of the flange section 16a formed. The inclined surface 71aof the exclusion section 71 is relative to a radial direction of the first axis of rotation X1 of the crankshaft 14 inclined. As in the Fig. 3A and Fig. As shown in 3B, the output element 32 a lowered section 85 on the outer edge surface 32c of the first end section 32a of the output element 32 up. The lowered section 85 is arranged circumferentially at a location corresponding to the recessed section 71 corresponds. The controlling end 64c the intervention handle 64 glides along the inclined surface 71a of the exclusion section 71 , while the first rotary transmission element 16 relative to the drive element 32 turns. To be precise, it's like in Fig. As shown in 3B, the control end 64c the intervention handle 64 within the exclusion section 71arranged when the crankshaft 14 rotates in the forward direction and the first rotary transmission element 16 in the forward direction of rotation with respect to the output element 32 It rotates. This moves the engagement pawl. 64 towards the intervention position, as in Fig. 4B shown. On the other hand, as in Fig. 3A shows the control end 64c the intervention handle 64 outside the exclusion section 71 and within the lowered section 85 arranged when the crankshaft 14 rotates in the reverse direction and the first rotary transmission element 16 in the reverse direction of rotation with respect to the output element 32 It rotates. This moves the engagement pawl. 64 towards the release position, as in Fig. 4A shown.

[0064] Furthermore, as shown in the Fig. 3A and Fig. 3B shows the first rotary transmission element 16 a plurality of exceptions 87 on the inner edge surface 16c of the flange section 16a open. The cutouts 87 are in the circumferential direction on the inner edge surface 16c of the flange section 16a arranged. On the other hand, the output element has 32 a plurality of protrusions 89 on the outer edge surface 32c of the first end section 32a up. The protrusions 89 are in the circumferential direction on the outer edge surface 32c of the first end section 32a arranged. The recesses 87 and the protrusions 89 are arranged relative to each other with a circumferential spacing between them to limit the range of relative rotation between the first rotary transmission element 16 and the output element 32 to provide.

[0065] In the embodiment shown, as in the Fig. 3A and Fig. 3B shows each of the recesses 87 a first and a second inner surface 87a and 87b up, while each of the protrusions 89 a first and a second contact surface 89a and 89b exhibits.

[0066] As in Fig. Shown in 3B, the first inner surfaces make contact 87a the exceptions 87 in the circumferential direction, the first contact surfaces in each case 89a the protrusions 89 , while the crankshaft 14 rotates in the forward direction. Furthermore, it couples while the crankshaft rotates. 14 in the forward direction of rotation, the freewheel clutch 38 effectively the torque transmission part 42 with the output element 32 However, if the torque sensor 50If the detected pedaling force is less than a prescribed threshold, the motor output torque of the motor will be reduced. 30 not generated, even if the crankshaft 14 rotates in the forward direction. In this case, the first inner surfaces make contact. 87a the exceptions 87 of the first rotary transmission element 16 each of the first contact surfaces 89a the protrusions 89 of the output element 32 such that the rotation of the crankshaft 14 in the forward direction of rotation of the first rotary transmission element 16 to the output element 32 is transmitted. Furthermore, while the torque sensor is used 50 The detected pedaling force is greater than the prescribed threshold, the motor output torque of the motor 30 generated as a supporting force to assist the pedaling force when the crankshaft 14rotates in the forward direction. In this case, the first inner surfaces make contact. 87a the exceptions 87 of the first rotary transmission element 16 each of the first contact surfaces 89a the protrusions 89 of the output element 32 such that the motor output torque of the motor 30 to the output element 32 via the torque transmission part 42 and the freewheel clutch 38 is transferred.

[0067] As in Fig. 3B shown, on the other hand the second inner surfaces make contact 87b the exceptions 87 in the circumferential direction, the second contact surfaces in each case 89b the protrusions 89 , while the crankshaft 14 rotates in the reverse direction. While the crankshaft 14 When rotating in the reverse direction, the freewheel clutch disengages. 38 the torque transmission part 42effective from the drive element 32 , to prevent the rotation of the crankshaft 14 on the output shaft 30c of the engine 30 via the torque transmission part 42 is transferred. When the crankshaft 14 When rotating in the reverse direction, the second inner surfaces contact 87b the exceptions 87 of the first rotary transmission element 16 each of the second contact surfaces 89b the protrusions 89 of the output element 32 such that the rotation of the crankshaft 14 in the reverse direction of rotation directly from the first rotary transmission element 16 to the output element 32 is transferred.

[0068] This drive unit 10 The torque in the forward direction of rotation, generated by the pedaling force, is transmitted via the following transmission path: the crank arms 101→ the crankshaft 14 → the first rotary transmission element 16 → the output element 32 → the front sprocket 28 Furthermore, the output torque of the motor is 30 To support the pedaling force in the forward direction of rotation, it is transmitted via the following path: the third rotary transmission element 26 → the second rotary transmission element 20 → the torque transmission part 42 → the freewheel clutch 38 → the output element 32 → the front sprocket 28 .

[0069] On the other hand, this drive unit is used 10 including the reverse rotation of the crank arms 101 to the front sprocket 28 transferred to the front sprocket 28 to rotate in the reverse direction. More precisely, the torque generated by the pedaling force is also transmitted in the reverse direction via the following transmission path: the crank arms. 101→ the crankshaft 14 → the first rotary transmission element 16 → the output element 32 → the front sprocket 28 The reverse rotation of the crank arms 101 It is not connected to the torque transmission part 42 of the torque combination mechanism 36 by actuating the freewheel clutch 38 transmitted.

[0070] In the embodiment shown, the drive unit comprises 10 the freewheel clutch 38 , to selectively control the engine 30 with the front sprocket 28 to couple. However, the drive unit can 10 one of the freewheel clutch 38 Various freewheel clutches are included. Referring to the Fig. 5A and Fig. 5B will now be the freewheel clutch 138 further detailed as a modified example of the freewheel clutch 38 as described in the first embodiment. Fig. 5A and Fig. Shown in 5B, the freewheel clutch includes 138 a friction engagement section 160 , a plurality (three in this embodiment) of engagement pawls 164 (e.g. engagement elements) and a plurality (three in this embodiment) of prestressing elements 166 The freewheel clutch 138 It also includes a plurality (three in this embodiment) of control parts 168 and a plurality (three in this embodiment) of contact parts 170 Of course, experts will clearly see from this revelation that the number of interventional clinics 164 , the prestressing elements 166 , the control parts 168 and the contact parts 170 The number can be less or more than three, as needed and / or desired.

[0071] The friction engagement section 160 is on a cylindrical inner edge surface 142a a torque transmission component142 arranged. The torque transmission part 142 is essentially identical to the torque transmission part 42 , except that the torque transmission part 142 a non-toothed cylindrical inner surface 142a includes the torque transmission part. 142 is effective with the engine 30 coupled. The friction engagement section 160 engages selectively and frictionally with the engagement latches. 164 in action to control the rotation of the engine 30 to a drive element 132 to transfer. The output element 132 is also essentially identical to the output element 32 , except that the output element 132 the intervention handles 164 is pivotably mounted, and that the output element 132 a cylindrical outer edge surface without the projections 89 of the output element 32 exhibits. The output element 132is fixed to the front sprocket 28 coupled.

[0072] The intervention handles 164 are between a release position (see Fig. 5B) and an intervention position (see Fig. 5A) pivotably arranged. In the embodiment shown, the engagement pawls are 164 in the conventional way with the output element 132 coupled. The engagement latches 164 are arranged relative to each other at equal circumferential intervals, with the engagement latches positioned between them in the circumferential direction. 164 are formed, with the inner boundary surface 142a (i.e., the friction engagement section) 160 ) of the torque transmission part 142 to engage frictionally while the crankshaft 14 rotates around the first axis of rotation X1 in the forward direction (e.g., the first direction of rotation). The engagement pawls 164 are formed from the inner boundary surface 142aof the torque transmission part 142 to be loosened at least by friction, while the crankshaft 14 about the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). In the illustrated embodiment, the phrase "the engagement pawls" engages 164 are formed from the inner boundary surface 142a of the torque transmission part 142 "at least to be resolved by friction" does not necessarily require that the engagement latches 164 from the friction engagement section 160 are spaced apart. Rather, it can mean that the intervention handles are spaced apart. 164 along the inner boundary surface 142a of the torque transmission part 142 slide while gliding with the inner edge surface 142a are in contact. In this case, the intervention points will be used. 164 from the inner edge surface 142a (i.e., the friction engagement section) 160) solved to prevent the rotation of the crankshaft 14 on the output shaft 30c of the engine 30 is transferred while the crankshaft 14 about the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). Furthermore, in the illustrated embodiment, the friction engagement section 160 and the intervention handles 164 used to create a frictional engagement in the freewheel clutch 138 to obtain. However, other types of friction-lock engagement elements can of course be used in the freewheel clutch. 138 instead of the intervention handles 164 be used.

[0073] The prestressing elements 166 tension the engagement latches 164 towards the release position, as in Fig. 5B shown. The prestressing elements 166 are attached to the intervention handles in the conventional way 164 attached.

[0074] The control units 168 are trained, the interventional clinics 164 to move each time towards the release position, while the crankshaft 14 rotates around the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). The contact parts 170 are designed to rotate the crankshaft 14 on the output element 132 to transfer while the crankshaft 14 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0075] As in the Fig. 5A and Fig. As shown in 5B, the control parts, to be precise, jump 168 radially at an outer edge surface 116a of the first rotary transmission element 116 at locations that are spaced apart from each other in the circumferential direction. The contact parts 170 They also jump radially at the outer edge surface. 116a of the first rotary transmission element 116at locations that are situated circumferentially between the control parts 168 lie. As in Fig. 5A shown, press the control parts 168 the intervention handles 164 on interior surfaces 164a the interventional handles 164 each towards the engagement position, while the crankshaft 14 rotates in the forward direction. This brings the outer surfaces 164b the interventional handles 164 with the friction engagement section 160 in action. Thus, the rotation of the motor is stopped. 30 to the front sprocket 28 via the torque transmission part 142 , the free-running clutch 138 and the output element 132 transmitted while the crankshaft 14 rotates in the forward direction. On the other hand, they rotate, as in Fig. 5B shows the control parts 168 relative to the inner surfaces 164a the interventional handles 164away, while the crankshaft 14 rotates in the reverse direction. Then the preload elements move. 166 the intervention handles 164 towards the release position. This releases the outer surfaces. 164b the interventional handles 164 from the friction engagement section 160 Furthermore, the contact parts make contact 170 Storage 164c the interventional handles 164 , while the crankshaft 14 rotates in the reverse direction. This rotates the output element. 132 in the reverse direction of rotation. Thus, the reverse rotation of the crankshaft 14 to the front sprocket 28 via the first rotary transmission element 116 and the output element 132 transmitted. SECOND VERSION

[0076] With reference to Fig. 6 will now be a drive unit 210 explained according to a second embodiment.

[0077] Given the similarity between the first and second embodiments, those parts of the second embodiment that are identical to the parts of the first embodiment are given the same reference numerals as the parts of the first embodiment. Likewise, parts of this second embodiment that are functionally identical and / or substantially identical to parts of the first embodiment are given the same reference numerals, except that "200" is added. In any case, for the sake of brevity, the descriptions of those parts of the second embodiment that are substantially identical to the parts of the first embodiment can be omitted. However, it will be clear to those skilled in the art from this disclosure that the descriptions and illustrations of the first embodiment also apply to this second embodiment, with the exception of what is discussed and / or illustrated here.

[0078] Essentially, the drive unit 210 near the crank arms 101 arranged (see Fig. 1) In the embodiment shown, as in Fig. As shown in section 6, the drive unit 210 a case 212 , a crankshaft 214 , a first rotary transmission element 216 , an intermediate axis 218 , a second rotary transmission element 220 , a third rotary transmission element 226 and a front sprocket 228 (e.g., a front sprocket). As in Fig. As shown in 6, the drive unit 210 an engine 230 , a driven element 232 and a torque combination mechanism 236 with a freewheel clutch 238 on. Thus, the bicycle drive unit includes 210 the crankshaft 214 , the engine 230 , the output element 232 and the torque combination mechanism 236 .

[0079] In the embodiment shown, the intermediate axis 218 , the second rotary transmission element 220 , the third rotary transmission element 226 and the engine 230 identical to the intermediate axis 18 , the second rotary transmission element 20 , the third rotary transmission element 26 and the engine 30 according to the first embodiment. Therefore, for the sake of brevity, the detailed configurations are omitted. Furthermore, the housing 212 also identical to the housing 12 according to the first embodiment, with the exception of minor modifications for accommodating the first rotary transmission element 216 , the intermediate axis 218 , of the second rotary transmission element 220 , of the third rotary transmission element 226 , of the engine 230 and the torque combination mechanism 236according to the second embodiment. Therefore, for the sake of brevity, the detailed configurations are omitted.

[0080] The case 212 It mainly houses the first rotary transmission element. 216 , the intermediate axis 218 , the second rotary transmission element 220 , the third rotary transmission element 226 , the engine 230 and the torque combination mechanism 236 The housing also stores 212 the crankshaft 214 rotatable. The crankshaft 214 extends axially through the housing 212 .

[0081] The crankshaft 214 is essentially identical to the crankshaft 14 according to the first embodiment. The crankshaft 214 The crankshaft is rotatable about a first axis of rotation X1. 214 is regarding the housing 212 through a first, second, third and fourth camp 245a , 245b ,245c and 245d , such as ball bearings, are mounted. The first bearing 245a is radially between a first side part 212a of the case 212 and the crankshaft 214 in the opening of the first side panel 212a arranged. The second camp 245b is between the output element 232 and the crankshaft 214 radially arranged. The third bearing 245c is between the output element 232 and a torque transmission component 242 of the torque combination mechanism 236 radially arranged. The fourth bearing 245d is between the torque transmission part 242 of the torque combination mechanism 236 and a second side panel 212b of the case 212 radially arranged. The two ends of the crankshaft 214 are arranged so that they emerge from the first side panel 212a or the second side panel 212b stand out.

[0082] The first rotary transmission element 216 features a freewheel clutch 244 on, which are between the crankshaft 214 and the output element 232 is arranged radially. The freewheel clutch 244 It only transmits the rotation of the crankshaft. 214 in the forward direction of rotation to the output element 232 In the embodiment shown, the freewheel clutch 244 designed as a roller coupling. The intermediate shaft 218 is inside the case 212 The second rotary transmission element is rotatably mounted by a pair of bearings. 220 has a large gear 220a and a small gear 220b up. The large gear 220a is on the intermediate axis 218 via a freewheel clutch 240 rotatably mounted. The freewheel clutch 240 only transmits the rotation of the motor 230in one direction to support the pedaling force in the forward rotation. The third rotational transmission element 226 features an externally toothed gear 226a on.

[0083] In the embodiment shown, the front pinion 228 and the output element 232 integrally designed as a single, unified element. Thus, the front pinion rotates 228 and the output element 232 together. The output element 232 is essentially a cylindrical element that extends axially along the first axis of rotation X1. The front pinion 228 rotates around the first axis of rotation X1 of the crankshaft 214 Thus, the axis of rotation of the crankshaft 214 and the axis of rotation of the front pinion 228 together. In the embodiment shown, the front pinion 228 and the output element 232integrally designed as a single, unified element. However, the front sprocket can of course be... 228 and the output element 232 They can be designed independently as separate parts. In this case, the output element is... 232 formed, on the front sprocket 228 (e.g., the front sprocket). For example, the front sprocket can be attached. 228 It comprises a conventional spider with a sleeve and a conventional ring sprocket attached to the spider in a conventional manner. Then the output part can 232 firmly attached to the sleeve of the spider of the front sprocket 228 be coupled.

[0084] The output element 232 It is rotatable on the crankshaft 214 It is mounted. More precisely, the output element is mounted. 232 relative to the crankshaft 214 rotatable. The output element 232is rotatable about the first axis of rotation X1 in the forward direction of rotation (e.g. a first direction of rotation), while the crankshaft 214 about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the output element 232 rotatable around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation), while the crankshaft 214 The first axis of rotation X1 rotates in the reverse direction (e.g., the second direction of rotation). The reverse direction (e.g., the second direction of rotation) is opposite to the forward direction of rotation (e.g., the first direction of rotation). The output element 232 is via the freewheel clutch 244 and the second camp 245b rotatable on the crankshaft 214 It is mounted. More precisely, the output element has 232 a first and a second final section 232a and 232b up. The first final section 232ais on the crankshaft 214 via the freewheel clutch 244 stored, while the second end section 232b on the crankshaft 214 about the second camp 245b is mounted. The output element 232 It also has a torque sensor 250 with a pair of magnetic deflection elements and a pair of coils (only the magnetic deflection elements are in Fig. (shown in Figure 6). The magnetic deflection elements and the coils are oriented towards each other in the conventional manner. The torque sensor 250 The detected torque is used to control the rotary output of the motor. 230 to control. Of course, experts will clearly understand from this revelation that the torque sensor 250 could be a different type of torque sensor.

[0085] In the embodiment shown, the motor 230 an internal rotor type motor. The motor 230features a rotor 230a and a stator 230b up. Since the engine 230 Since it has a conventional design, a detailed description is omitted for the sake of brevity. The stator 230b is fixed to an inner side surface of the housing 212 coupled. The rotor 230a is fixed to an output shaft 230c of the engine 230 coupled. The output shaft 230c is relative to the case 212 The output shaft is rotatably mounted on a pair of bearings. More precisely, the output shaft... 230c rotatable about a second axis of rotation X2. In the illustrated embodiment, the second axis of rotation X2 is arranged such that it extends parallel to the first axis of rotation X1 at spaced-apart locations.

[0086] In the embodiment shown, the gear 226a of the third rotary transmission element 226 fixed to a distal end of the output shaft 230c of the engine230 coupled. The gear 226a is also with the large gear 220a of the second rotary transmission element 220 in engagement. The large gear 220a is connected to the intermediate axis 218 via the freewheel clutch 240 Rotatably coupled. The freewheel clutch 240 transmits only one rotary output of the motor 230 for the forward rotation of the front pinion 228 to the intermediate axle 218 The small gear 220b is fixed to the intermediate axle 218 coupled.

[0087] The torque combination mechanism 236 is effective between the engine 230 and the output element 232 arranged. The torque combination mechanism 236 couples the output shaft 230c of the engine 230 effective with the drive element 232 , to control the rotation of the output shaft 230c of the engine 230 on the output element232 to transmit. The torque combination mechanism 236 is formed, the output shaft 230c of the engine 230 effective from the drive element 232 to separate in order to prevent the rotation of the crankshaft 214 on the output shaft 230c of the engine 230 is transferred while the crankshaft 214 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0088] More precisely, the torque combination mechanism features 236 the freewheel clutch 238 The torque combination mechanism 236 It also features a torque transmission component. 242 up. The torque transmission part 242 It is rotatable about the first axis of rotation X1. The torque transmission part 242 is effective with the output shaft 230c of the engine 230 coupled. More precisely, the torque transmission part. 242on an outer edge surface of the first end section 232a of the output element 232 about the third camp 245c It is rotatably mounted. Furthermore, the torque transmission component is 242 rotatable on the housing 212 about the third camp 245d The torque transmission part is mounted. 242 has an outer gear 246 on an outer edge surface of a large-diameter section of the torque transmission part 242 on. The outer gear 246 is with the small gear 220b of the second rotary transmission element 220 in engagement. Thus, the torque transmission component transmits 242 the rotation of the engine 230 The torque transmission part 242 is with the output element 232 via the freewheel clutch 238 Rotatable mounting.

[0089] The freewheel clutch 238 is between an inner boundary surface 242aof the torque transmission part 242 and the second final section 232b of the output element 232 arranged. In other words, the freewheel clutch is 238 effective between the output shaft 230c of the engine 230 and the output element 232 arranged. The freewheel clutch 238 only transmits the rotation of the motor 230 to the output element 232 , while the crankshaft 214 rotates in the forward direction. The torque combination mechanism 236 combines the rotary output of the motor 230 , which is attached to the outer gear 246 of the torque transmission part 242 is transmitted, and the rotary output of the crankshaft 214 , which is from the first rotary transmission element 216 via the freewheel clutch 244 is transmitted. More precisely, the freewheel clutch couples 238 the output shaft 230c of the engine 230effective with the drive element 232 , while the crankshaft 214 about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the freewheel clutch disengages. 238 the output shaft 230c of the engine 230 effective from the drive element 232 , to prevent the rotation of the crankshaft 214 on the output shaft 230c of the engine 230 is transferred while the crankshaft 214 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0090] Referring to the Fig. 7A and Fig. 7B will now describe the construction of the freewheel clutch. 238 further described in detail. The freewheel clutch 238 includes an internally toothed section 260 , an access handle 264 and a pre-tensioning element 266 The freewheel clutch 238It also includes a control unit. 268 .

[0091] The gear section 260 is on the inner edge surface 242a of the torque transmission part 242 arranged. The gear section 260 has a majority of surgical teeth 260a on, which are located on the inner edge surface 242a of the torque transmission part 242 are formed. The intervention teeth 260a indicate intervention areas 260b on, which selectively with the engagement latch 264 to intervene in order to stop the rotation of the engine 230 to the output element 232 to transfer.

[0092] The access handle 264 is at the second end section 232b of the output element 232 Swivel-mounted. The engagement latch. 264 is between a release position (see Fig. 7B) and an intervention position (see Fig. 7A) is pivotably arranged. The engagement latch 264 is formed, with the gear section 260 to engage while the crankshaft is rotating 214 around the first axis of rotation X1 in the forward direction of rotation (e.g. the first direction of rotation or clockwise in Fig. 7A) rotates. The engagement pawl 264 is formed by the gear section 260 to be resolved while the crankshaft 214 around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation or counterclockwise in Fig. 7B) rotates. In the embodiment shown, "releasing" the engagement pawl requires 264 from the gear section 260 not necessarily that the intervention handle 264 from the gear section 260 is spaced apart. Rather, this can mean that the intervention handle 264 over the gear section 260slides while it passes through the gear section 260 touched. In this case, the intervention handle is 264 from the gear section 260 released to prevent the rotation of the crankshaft 214 on the output shaft 230c of the engine 230 is transferred while the crankshaft 214 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0093] The access handle 264 indicates the end of the intervention 264a , a controlling end 264b and a storage end 264c up, which occurs between the end of the procedure 264a and the steering end 264b is ordered. The end of the intervention. 264a is with the surgical teeth 260a of the gear section 260 during the procedure, while the operating handle is moving 264 at the intervention position. The end of the intervention. 264a is from the surgical teeth 260aof the gear section 260 released while the engagement latch 264 at the release position. The engagement latch. 264 is at the second end section 232b of the output part 232 It is mounted in a conventional, swiveling manner. To be precise, the engagement latch is 264 within a handle opening 232c of the second final section 232b of the output part 232 Arranged in a swiveling manner. As in the Fig. 7A and Fig. As shown in 7B, the latch opening extends 232c radially through the second end section 232b In the embodiment shown, the bearing part 264c the intervention handle 264 swiveling, coupled with a pivot pin that is located within the latch opening 232c of the output part 232 is arranged. The engagement handle 264 is relative to the second end section 232carranged so that the intervention ends 264a relative to the second end section 232b protrudes radially outwards and the controlling end 264b relative to the second end section 232b protrudes radially inwards. The control end 264c is controlled by the control unit 268 actuated in such a way that the engagement latch 264 pivots between the release position and the engagement position. In the illustrated embodiment, the freewheel clutch comprises 238 a single access handle 264 However, experts will clearly understand from this revelation that the freewheel clutch 238 includes a number of interventional clinics.

[0094] The preloading element 266 tensions the engagement latch 264 towards the engagement position. The preload element 266 It essentially comprises a latch spring that effectively engages the latch. 264and the output element 232 is arranged. In the embodiment shown, the freewheel clutch comprises 238 a single prestressing element 266 However, experts will clearly understand from this revelation that the freewheel clutch 238 comprises a plurality of prestressing elements, which correspond to a plurality of engagement pawls.

[0095] The control unit 268 is on an outer surface of the crankshaft 214 arranged. The control unit 268 is trained, the intervention handle 264 to move towards the release position while the crankshaft 214 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). As in the Fig. 7A and Fig. As shown in 7B, specifically the output part is shown. 232 a plurality of exceptions 287 (e.g. recessed parts) on an inner edge surface 232dof the second final section 232b open. The cutouts 287 are in the circumferential direction on the inner edge surface 232d of the second final section 232b arranged. On the other hand, the crankshaft 214 a plurality of protrusions 289 on an outer edge surface 214a the crankshaft 214 up. The protrusions 289 are in the circumferential direction on the outer edge surface 214a the crankshaft 214 arranged. In the embodiment shown, one of the projections forms 289 the control unit 268 out. The exceptions 287 and the protrusions 289 are arranged relative to each other with a circumferential spacing between them to limit the range of relative rotation between the crankshaft 214 and the output element 232 to provide.

[0096] In the embodiment shown, as in the Fig. 7A and Fig. 7b shows each of the recesses 287 a first and a second inner surface 287a and 287b up, while each of the protrusions 289 a first and a second contact surface 289a and 289b exhibits.

[0097] As in Fig. 7A shows the first contact surfaces. 289a the protrusions 289 in the circumferential direction the first inner surfaces 287a the exceptions 287 Neither, while the crankshaft 214 rotates in the forward direction. Rather, each of the first contact surfaces 289a the protrusions 289 in the circumferential direction of each of the first inner surfaces 287a the exceptions 287 facing each other with a gap in between, while the crankshaft 214 rotates in the forward direction. Furthermore, it couples while the crankshaft rotates. 214in the forward direction of rotation, the freewheel clutch 238 effectively the torque transmission part 242 with the output element 232 However, if the torque sensor 250 If the detected pedaling force is less than a prescribed threshold, the motor output torque of the motor will be reduced. 230 not generated, even if the crankshaft 214 rotates in the forward direction. In this case, the freewheel clutch engages. 244 of the first rotary transmission element 216 the crankshaft 214 effectively in this way with the drive element 232 that the rotation of the crankshaft 214 in the forward direction of rotation from the crankshaft 214 via the freewheel clutch 244 on the output element 232 is transmitted. Furthermore, while the torque sensor is used 250The detected pedaling force is greater than the prescribed threshold, the motor output torque of the motor 230 generated as a supporting force to assist the pedaling force when the crankshaft 214 rotates in the forward direction. In this case, the freewheel clutch engages. 238 the torque transmission part 242 effectively in this way with the drive element 232 , that the motor output torque of the motor 230 via the torque transmission part 242 and the freewheel clutch 238 to the output element 232 is transferred.

[0098] In the embodiment shown, the rotation of the crankshaft 214 in the forward direction of rotation from the crankshaft 214 only via the freewheel clutch 244 of the first rotary transmission element 216 on the output element 232 transmitted.

[0099] As in Fig. 7B shown, on the other hand the second contact surfaces make contact 289b the protrusions 289 (e.g. a contact surface of the control part) in the circumferential direction the second inner surfaces 287b the exceptions 287 (e.g. an inner surface of the recessed part of the output element) to control the rotation of the crankshaft 214 each to the output element 232 to transfer while the crankshaft 214 about the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). While the crankshaft 214 When rotating in the reverse direction, the freewheel clutch disengages. 238 the torque transmission part 242 effective from the drive element 232 , to prevent the rotation of the crankshaft 214 on the output shaft 230c of the engine 230 via the torque transmission part 242 is transferred. When the crankshaft 214When rotating in the reverse direction, the second contact surfaces make contact 289b the protrusions 289 the crankshaft 214 each of the second inner surfaces 287b the exceptions 287 of the output element 232 such that the rotation of the crankshaft 214 in the reverse direction of rotation directly from the crankshaft 214 to the output element 232 is transferred.

[0100] This drive unit 210 The torque in the forward direction of rotation, generated by the pedaling force, is transmitted via the following transmission path: the crank arms 101 → the crankshaft 214 → the first rotary transmission element 216 → the output element 232 → the front sprocket 228 Furthermore, the output torque of the motor is 230To support the pedaling force in the forward direction of rotation, it is transmitted via the following path: the third rotary transmission element 226 → the second rotary transmission element 220 → the torque transmission part 242 → the freewheel clutch 238 → the output element 232 → the front sprocket 228 .

[0101] On the other hand, this drive unit is used 210 including the reverse rotation of the crank arms 101 to the front sprocket 228 transferred to the front sprocket 228 to rotate in the reverse direction. More precisely, the torque generated by the pedaling force is also transmitted in the reverse direction via the following transmission path: the crank arms. 101 → the crankshaft 214 → the intervention between the recesses 287 and the protrusions 289 → the output element 232 → the front sprocket 228The reverse rotation of the crank arms 101 It is not connected to the torque transmission part. 242 of the torque combination mechanism 236 by actuating the freewheel clutch 238 transmitted. THIRD VERSION

[0102] With reference to Fig. 8 will now be a drive unit 310 explained according to a third embodiment.

[0103] Given the similarity between the first and third embodiments, those parts of the third embodiment that are identical to the parts of the first embodiment are given the same reference numerals as the parts of the first embodiment. Likewise, parts of this third embodiment that are functionally identical and / or substantially identical to parts of the first embodiment are given the same reference numerals, except that "300" is added. In any case, for the sake of brevity, the descriptions of those parts of the third embodiment that are substantially identical to the parts of the first embodiment can be omitted. However, it will be clear to those skilled in the art from this disclosure that the descriptions and illustrations of the first embodiment also apply to this third embodiment, with the exception of what is discussed and / or illustrated here.

[0104] Essentially, the drive unit 310 near the crank arms 101 arranged (see Fig. 1) In the embodiment shown, as in Fig. As shown in section 8, the drive unit 310 a case 312 , a crankshaft 314 , a first rotary transmission element 316 , an intermediate axis 318 , a second rotary transmission element 320 , a third rotary transmission element 326 and a front sprocket 328 (e.g., a front sprocket). As in Fig. As shown in 8, the drive unit 310 an engine 330 , a driven element 332 and a torque combination mechanism 336 with a freewheel clutch 338 on. Thus, the bicycle drive unit includes 310 the crankshaft 314 , the engine 330 , the output element 332 and the torque combination mechanism 336 .

[0105] In the embodiment shown, the intermediate axis 318 , the second rotary transmission element 320 , the third rotary transmission element 326 and the engine 330 identical to the intermediate axis 18 , the second rotary transmission element 20 , the third rotary transmission element 26 and the engine 30 according to the first embodiment. Therefore, for the sake of brevity, the detailed configurations are omitted. Furthermore, the housing 312 also identical to the housing 12 according to the first embodiment, with the exception of minor modifications for accommodating the first rotary transmission element 316 , the intermediate axis 318 , of the second rotary transmission element 320 , of the third rotary transmission element 326 , of the engine 330 and the torque combination mechanism 336according to the third embodiment. Therefore, for the sake of brevity, the detailed configurations are omitted.

[0106] The case 312 It mainly houses the first rotary transmission element. 316 , the intermediate axis 318 , the second rotary transmission element 320 , the third rotary transmission element 326 , the engine 330 and the torque combination mechanism 336 The housing also stores 312 the crankshaft 314 rotatable. The crankshaft 314 extends axially through the housing 312 .

[0107] The crankshaft 314 is essentially identical to the crankshaft 14 according to the first embodiment. The crankshaft 314 The crankshaft is rotatable about a first axis of rotation X1. 314 is regarding the housing 312 through a first, second and third camp 345a , 345b and 345c, such as ball bearings, are mounted. The first bearing 345a is radially between a first side part 312a of the case 312 and the crankshaft 314 in the opening of the first side panel 312a arranged. The second camp 345b is between the output element 332 and the crankshaft 314 radially arranged. The third bearing 345b is between the output element 332 and the second side panel 312b of the case 312 radially arranged. The two ends of the crankshaft 314 are arranged so that they emerge from the first side panel 312a or the second side panel 312b protrude. The first rotary transmission element 316 features an enlarged gear section 316a on, which is fixed to the crankshaft 314 is coupled. The intermediate axis 318 is inside the case 312The second rotary transmission element is rotatably mounted by a pair of bearings. 320 has a large gear 320a and a small gear 320b up. The large gear 320a is on the intermediate axis 318 via a freewheel clutch 340 rotatably mounted. The freewheel clutch 340 only transmits the rotation of the motor 330 in one direction to support the pedaling force in the forward rotation. The third rotational transmission element 326 features an externally toothed gear 326a on.

[0108] In the embodiment shown, the front pinion 328 and the output element 332 firmly coupled together. In other words, the output element is 332 formed, on the front sprocket 328 (e.g., the front sprocket). This allows the front sprocket to rotate. 328 and the output element 332together. The output element 332 is essentially a cylindrical element that extends axially along the first axis of rotation X1. The front pinion 328 rotates around the first axis of rotation X1 of the crankshaft 314 Thus, the axis of rotation of the crankshaft 314 and the axis of rotation of the front pinion 328 together. In the illustrated embodiment, the front pinion 328 and the output element 332 independently designed as separate parts. However, the front sprocket can of course be... 328 and the output element 332 It must be designed as an integral, one-piece, unified element.

[0109] The output element 332 It is rotatable on the crankshaft 314 It is mounted. More precisely, the output element is mounted. 332 relative to the crankshaft 314 rotatable. The output element 332is rotatable about the first axis of rotation X1 in the forward direction of rotation (e.g. a first direction of rotation), while the crankshaft 314 about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the output element 332 rotatable around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation), while the crankshaft 314 The first axis of rotation X1 rotates in the reverse direction (e.g., the second direction of rotation). The reverse direction (e.g., the second direction of rotation) is opposite to the forward direction of rotation (e.g., the first direction of rotation). The output element 332 is about the second camp 345b rotatable on the crankshaft 314 stored.

[0110] In the embodiment shown, the motor 330 an internal rotor type motor. The motor 330 features a rotor 330a and a stator 330b up. Since the engine330 Since it has a conventional design, a detailed description is omitted for the sake of brevity. The stator 330b is fixed to an inner side surface of the housing 312 coupled. The rotor 330a is fixed to an output shaft 330c of the engine 330 coupled. The output shaft 330c is relative to the case 312 The output shaft is rotatably mounted on a pair of bearings. More precisely, the output shaft... 330c rotatable about a second axis of rotation X2. In the illustrated embodiment, the second axis of rotation X2 is arranged such that it extends parallel to the first axis of rotation X1 at spaced-apart locations.

[0111] In the embodiment shown, the gear 326a of the third rotary transmission element 326 fixed to a distal end of the output shaft 330c of the engine 330 coupled. The gear 326a is also with the large gear320a of the second rotary transmission element 320 in engagement. The large gear 320a with the intermediate axle 318 via the freewheel clutch 340 Rotatably coupled. The freewheel clutch 340 transmits only one rotary output of the motor 330 for the forward rotation of the front pinion 328 to the intermediate axle 318 The small gear 320b is fixed to the intermediate axle 318 coupled.

[0112] The torque combination mechanism 336 couples the motor 330 and the crankshaft 314 effective to the rotary outputs of the motor 330 and the crankshaft 314 to combine. The torque combination mechanism 336 is effective between the engine 330 and the output element 332 arranged. The torque combination mechanism 336 couples the output shaft 330c of the engine 330effective with the drive element 332 , to control the rotation of the output shaft 330c of the engine 330 on the output element 332 to transmit. The torque combination mechanism 336 is formed, the output shaft 330c of the engine 330 effective from the drive element 332 to separate in order to prevent the rotation of the crankshaft 314 on the output shaft 330c of the engine 330 is transferred while the crankshaft 314 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0113] More precisely, the torque combination mechanism features 336 the freewheel clutch 338 The torque combination mechanism 336 The torque transmission part also features 342 up. The torque transmission part 342 It is rotatable about the first axis of rotation X1. The torque transmission part342 is effective with the output shaft 330c of the engine 330 coupled. More precisely, the torque transmission part. 342 rotatable on the crankshaft 314 about a fourth camp 345d The torque transmission part is mounted. 342 features a cladding section 343 and an axially extending sleeve 344 up. The fairing section 343 has an outer gear 346 on an outer edge surface of the cladding section 343 on. The outer gear 346 is with the small gear 320b of the second rotary transmission element 320 in intervention. The fairing section 343 is via a freewheel clutch 348 rotatable with the first rotary transmission element 316 coupled. In particular, the freewheel clutch 348 between an inner edge surface of the cladding section 343and the enlarged gear section 316a of the first rotary transmission element 316 arranged. The freewheel clutch 348 only transmits the forward rotation of the crankshaft 314 to the fairing section 343 of the torque transmission part 342 Thus, the torque combination mechanism combines 336 the rotary output of the motor 330 , which is attached to the outer gear 346 of the cladding section 343 is transmitted, and the rotary output of the crankshaft 314 , which is due to the enlarged gear section 316a via the freewheel clutch 348 is transferred. The axially extending sleeve 344 of the torque transmission part 342 is with the output element 332 via the freewheel clutch 338 at a final section 344a the axially extending sleeve 344 rotatably mounted. The axially extending sleeve 344of the torque transmission part 342 features a torque sensor 350 with a pair of magnetic deflection elements 350a and a pair of coils 350b on, which are radially facing each other. This is due to the torque sensor 350 The detected torque is used to control the rotary output of the motor. 330 to control. Of course, experts will clearly understand from this revelation that the torque sensor 350 could be a different type of torque sensor.

[0114] The freewheel clutch 338 is between an outer boundary surface 344b the axially extending sleeve 344 and the output element 332 at the final section 344a the axially extending sleeve 344 arranged. In other words, the freewheel clutch is 338 effective between the output shaft 330c of the engine 330 and the output element 332arranged. The freewheel clutch 338 only transmits the rotation of the motor 330 to the output element 332 , while the crankshaft 314 rotates in the forward direction. The torque combination mechanism 336 combines the rotary output of the motor 330 , which is attached to the outer gear 346 of the torque transmission part 342 is transmitted, and the rotary output of the crankshaft 314 , which is from the first rotary transmission element 316 via the freewheel clutch 338 is transmitted. More precisely, the freewheel clutch couples 338 the output shaft 330c of the engine 330 effective with the drive element 332 , while the crankshaft 314 about the first axis of rotation X1 in the forward direction of rotation (e.g., the first direction of rotation). On the other hand, the freewheel clutch disengages. 338 the output shaft 330c of the engine 330effective from the drive element 332 , to prevent the rotation of the crankshaft 314 on the output shaft 330c of the engine 330 is transferred while the crankshaft 314 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0115] Referring to the Fig. 9A and Fig. 9B will now cover the construction of the freewheel clutch. 338 further described in detail. The freewheel clutch 338 includes an externally toothed section 360 , an access handle 364 and a pre-tensioning element 366 The freewheel clutch 338 It also includes a control unit. 368 .

[0116] The gear section 360 is on the outer edge surface 344b the axially extending sleeve 344 of the torque transmission part 342 arranged. The gear section 360has a majority of surgical teeth 360a on, which are located on the outer edge surface 344b the axially extending sleeve 344 are formed. The intervention teeth 360a indicate intervention areas 360b on, which selectively with the engagement latch 364 to intervene in order to stop the rotation of the engine 330 to the output element 332 to transfer.

[0117] The access handle 364 is on the output element 332 Swivel-mounted. The engagement latch. 364 is between a release position (see Fig. 9B) and an intervention position (see Fig. 9A) is pivotally arranged. The engagement latch 364 is formed, with the gear section 360 to engage while the crankshaft is rotating 314 around the first axis of rotation X1 in the forward direction of rotation (e.g. the first direction of rotation or clockwise in Fig. 9A) rotates. The engagement pawl 364 is formed by the gear section 360 to be resolved while the crankshaft 314 around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation or counterclockwise in Fig. 9B) rotates. In the embodiment shown, "releasing" the engagement pawl requires 364 from the gear section 360 not necessarily that the intervention handle 364 from the gear section 360 is spaced apart. Rather, this can mean that the intervention handle 364 over the gear section 360 slides while it passes through the gear section 360 touched. In this case, the intervention handle is 364 from the gear section 360 released to prevent the rotation of the crankshaft 314 on the output shaft 330c of the engine 330is transferred while the crankshaft 314 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g. the second direction of rotation).

[0118] The access handle 364 indicates the end of the intervention 364a and a storage end 364b up. The end of the procedure. 364a is with the surgical teeth 360a of the gear section 360 during the procedure, while the operating handle is moving 364 at the intervention position. The end of the intervention. 364a is from the surgical teeth 360a of the gear section 360 released while the engagement latch 364 at the release position. The engagement latch. 364 is attached to the output element in the conventional manner 332 It is mounted in a swiveling position. To be precise, the engagement latch is... 364 within a clinic reception room 332a of the output element 332It is arranged to pivot. In the embodiment shown, the bearing part 364b the intervention handle 364 swiveling, coupled with a swivel pin that is located within the jack socket area 332a of the output element 332 is arranged. The engagement handle 364 is relative to the output element 332 arranged so that the intervention ends 364a protrudes radially inwards relative to the output element. The control end 364c is controlled by the control unit 368 actuated in such a way that the engagement latch 364 pivots between the release position and the engagement position. In the illustrated embodiment, the freewheel clutch comprises 338 a single access handle 364 However, experts will clearly understand from this revelation that the freewheel clutch 338 includes a number of interventional clinics.

[0119] The preloading element 366tensions the engagement latch 364 towards the engagement position. The preload element 366 It essentially comprises a latch spring that effectively engages the latch. 364 and the output element 332 is arranged. In the embodiment shown, the freewheel clutch comprises 338 a single prestressing element 366 However, experts will clearly understand from this revelation that the freewheel clutch 338 comprises a plurality of prestressing elements, which correspond to a plurality of engagement pawls.

[0120] The control unit 368 is on an outer edge surface 314a the crankshaft 314 arranged. The control unit 368 is trained, the intervention handle 364 to move towards the release position while the crankshaft 314 rotates around the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). As in the Fig. 9A and Fig. Shown in 9B, specifically the output element 332 a plurality of exceptions 387 (only one excluded part) 387 is in the Fig. 9A and Fig. (shown in 9B) on an inner boundary surface 332b of the output element 332 open. The cutouts 387 are in the circumferential direction on the inner edge surface 332b of the output element 332 arranged. On the other hand, the crankshaft 314 a plurality of protrusions 389 (only one lead) 389 will be in the Fig. 9A and Fig. (shown in 9B) on an outer edge surface 314a the crankshaft 314 up. The protrusions 389 are in the circumferential direction on the outer edge surface 314a the crankshaft 314 arranged. In the embodiment shown, one of the projections forms 389 the control unit 368 out. The exceptions 387and the protrusions 389 are arranged relative to each other with a circumferential spacing between them to limit the range of relative rotation between the crankshaft 314 and the output element 332 to provide. In the embodiment shown, the output element has 332 the majority of exceptions 387 on, while the crankshaft 314 the majority of protrusions 389 exhibits this. However, the driven element can of course 332 only one exception 387 exhibit, while the crankshaft 314 only one exception 389 can exhibit.

[0121] In the embodiment shown, as in the Fig. 9A and Fig. 9B shows each of the recesses 387 a first inner surface 387a up, while each of the protrusions 389 a first contact surface 389a exhibits.

[0122] As in Fig. As shown in 9A, the first contact surfaces are 389a the protrusions 389 in the circumferential direction from the first inner surfaces 387a the exceptions 387 each spaced apart, while the crankshaft 314 rotates in the forward direction. Furthermore, it couples while the crankshaft rotates. 314 in the forward direction of rotation, the freewheel clutch 338 effectively the final section 344a the axially extending sleeve 344 of the torque transmission part 342 with the output element 332 However, if the torque sensor 350 If the detected pedaling force is less than a prescribed threshold, the motor output torque of the motor will be reduced. 330 not generated, even if the crankshaft 314 rotates in the forward direction. In this case, the rotation of the crankshaft 314 in the forward direction of rotation from the crankshaft 314via the first rotary transmission element 316 , the freewheel clutch 348 , the torque transmission part 342 and the freewheel clutch 338 on the output element 332 transmitted. Furthermore, while the torque sensor is used 350 The detected pedaling force is greater than the prescribed threshold, the motor output torque of the motor 330 generated as a supporting force to assist the pedaling force when the crankshaft 314 rotates in the forward direction. In this case, the motor output torque of the motor 330 via the torque transmission part 342 and the freewheel clutch 338 to the output element 332 transmitted.

[0123] As in Fig. 9B shown, on the other hand, the first contact surfaces make contact 389a the protrusions 389 (e.g. a contact surface of the control part) in the circumferential direction the first inner surfaces387a the exceptions 387 (e.g. an inner surface of the recessed part of the output element) to control the rotation of the crankshaft 314 each to the output element 332 to transfer while the crankshaft 314 about the first axis of rotation X1 in the reverse direction of rotation (e.g., the second direction of rotation). While the crankshaft 314 When rotating in the reverse direction, the freewheel clutch disengages. 338 the torque transmission part 342 effective from the drive element 332 , to prevent the rotation of the crankshaft 314 on the output shaft 330c of the engine 330 via the torque transmission part 342 is transferred. When the crankshaft 314 When rotating in the reverse direction, the first contact surfaces make contact 389a the protrusions 389 the crankshaft 314 each of the first inner surfaces 387athe exceptions 387 of the output element 332 such that the rotation of the crankshaft 314 in the reverse direction of rotation directly from the crankshaft 314 to the output element 332 is transferred.

[0124] This drive unit 310 The torque in the forward direction of rotation, generated by the pedaling force, is transmitted via the following transmission path: the crank arms 101 → the crankshaft 314 → the first rotary transmission element 316 → the freewheel clutch 348 → the torque transmission part 342 → the freewheel clutch 338 → the output element 332 → the front sprocket 328 Furthermore, the output torque of the motor is 330 To support the pedaling force in the forward direction of rotation, it is transmitted via the following path: the third rotary transmission element 326 → the second rotary transmission element320 → the torque transmission part 342 → the freewheel clutch 338 → the output element 332 → the front sprocket 328 .

[0125] On the other hand, this drive unit is used 310 including the reverse rotation of the crank arms 101 to the front sprocket 328 transferred to the front sprocket 328 to rotate in the reverse direction. More precisely, the torque generated by the pedaling force is also transmitted in the reverse direction via the following transmission path: the crank arms. 101 → the crankshaft 314 → the intervention between the recesses 387 and the protrusions 389 → the output element 332 → the front sprocket 328 The reverse rotation of the crank arms 101 It is not connected to the torque transmission part. 342 of the torque combination mechanism 336 by actuating the freewheel clutch338 transmitted.

[0126] In the embodiments mentioned above, the drive unit can include a rotation detection sensor for detecting the direction of rotation of the crankshaft. A motor control device can control the motor based on a signal from the sensor. If the control device receives a detection signal from the sensor and determines that the crankshaft is rotating in the reverse direction, then the control device controls the motor so that it stops. The rotation detection sensor is configured to be a magnetic sensor or a rotary encoder.

[0127] To understand the scope of the present invention: the term "coupled" or "coupled," as used herein, includes configurations in which one element is directly attached to another by attaching the element directly to the other element; configurations in which the element is indirectly attached to the other element by attaching the element to the intermediate element(s), which in turn are attached to the other element; and configurations in which one element is integral with another element, i.e., one element is in principle part of the other element. This definition also applies to words with similar meanings, for example, "joined," "attached," "fastened," "mounted," "connected," "fixed," and their derivatives.

[0128] For the understanding of the scope of the present invention: the term "comprising" and its derivatives, as used herein, are intended to be open terms that indicate the presence of the specified features, elements, components, groups, numbers, and / or steps, but do not exclude the presence of other, unspecified features, elements, components, groups, numbers, and / or steps. The foregoing also applies to words with similar meanings, such as "include," "exhibit," and their derivatives.

[0129] It is also understood that, although the terms "first" and "second" may be used here to describe different components, these components should not be limited by these terms. These terms are used only to distinguish one component from another. Thus, for example, a first component discussed above could be referred to as a second component, and vice versa, without departing from the teachings of the present invention. Likewise, the terms "part," "section," "section," "component," or "element," when used in the singular, can have the dual meaning of a single part or a plurality of parts. Finally, terms of degree, such as "essentially," "approximately," and "approximately," as used here, signify a degree of deviation from the relative term, such that the final result is not significantly altered.

[0130] Although only selected embodiments have been chosen to illustrate the present invention, it will be clear to those skilled in the art from this disclosure that various changes and modifications can be made here without departing from the scope of the invention as defined in the appended claims. For example, the size, shape, location, or orientation of the various components can be changed as needed or desired, as long as they do not substantially impair their intended function. Components shown to be directly connected or in contact with one another may have intermediate structures arranged between them, unless specifically stated otherwise. The functions of one element may be performed by two, and vice versa, unless specifically stated otherwise. The structures and functions of one embodiment may be incorporated into another embodiment.It is not necessary for all advantages to be present simultaneously in a particular embodiment. Each feature that is unique compared to the prior art, alone or in combination with other features, should also be considered a separate description of further inventions of the applicant, including the structural and / or functional concepts embodied by such feature(s). Thus, the foregoing descriptions of embodiments according to the present invention are provided for clarification only and not for the purpose of limiting the invention as described by the appended claims and their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0131] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0132] EP 2380806 A2

[0002] JP 4959858

[0002] JP 08-310478 A

[0003]

Claims

[1] Bicycle drive unit, comprising: a crankshaft that is rotatable about a first axis of rotation; a motor which has an output shaft that is rotatable about a second axis of rotation; a driven element that is rotatable about the first axis of rotation in a first direction of rotation while the crankshaft rotates about the first axis of rotation in the first direction of rotation; and a torque combination mechanism that effectively couples the output shaft of the motor to the output element in order to transmit the rotation of the output shaft of the motor to the output element, wherein the torque combination mechanism is configured to effectively disconnect the output shaft of the motor from the output element in order to prevent the rotation of the crankshaft from being transmitted to the output shaft of the motor while the crankshaft rotates about the first axis of rotation in a second direction of rotation which is opposite to the first direction of rotation. [2] Bicycle drive unit according to claim 1, wherein the output element is rotatable relative to the crankshaft. [3] Bicycle drive unit according to claim 1 or 2, wherein the output element is rotatable about the first axis of rotation in the second direction of rotation, while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [4] Bicycle drive unit according to one of claims 1 to 3, wherein the output element is designed to be attached to a front sprocket. [5] Bicycle drive unit according to one of claims 1 to 4, wherein the torque combination mechanism comprises a freewheel clutch effectively arranged between the output shaft of the motor and the output element, wherein the freewheel clutch effectively couples the output shaft of the motor to the output element while the crankshaft rotates about the first axis of rotation in the first direction of rotation, and the freewheel clutch effectively disconnects the output shaft of the motor from the output element to prevent the rotation of the crankshaft from being transmitted to the output shaft of the motor while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [6] Bicycle drive unit according to one of claims 1 to 5, wherein the torque combination mechanism comprises a torque transmission part rotatable about the first axis of rotation, wherein the torque transmission part is effectively coupled to the output shaft of the motor. [7] Bicycle drive unit according to claim 5 or 6, wherein the freewheel clutch comprises a pawl which is pivotably arranged between a release position and an engagement position, wherein the pawl is configured to engage with a toothed section of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the first direction of rotation, wherein the pawl is configured to disengage from the toothed section of the torque transmission part of the torque combining mechanism while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [8] Bicycle drive unit according to claim 7, wherein the freewheel clutch further comprises a preloading element that preloads the engagement pawl to the engagement position. [9] Bicycle drive unit according to one of claims 5 to 8, wherein the freewheel clutch comprises an engagement element which is pivotably arranged between a release position and an engagement position, wherein the engagement element is configured to engage frictionally with an inner edge surface of the torque transmission part of the torque combination mechanism while the crankshaft rotates about the first axis of rotation in the first direction of rotation, wherein the engagement element is configured to be released at least frictionally from the inner edge surface of the torque transmission part of the torque combination mechanism while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [10] Bicycle drive unit according to claim 9, wherein the freewheel clutch further comprises a preloading element which preloads the engagement element to the release position. [11] Bicycle drive unit according to claim 9 or 10, further comprising: a control element designed to move the engagement element towards the engagement position while the crankshaft rotates about the first axis of rotation in the first direction of rotation. [12] Bicycle drive unit according to any one of claims 1 to 11, further comprising: a contact part designed to transmit the rotation of the crankshaft to the output element while the crankshaft rotates around the first axis of rotation in the second direction of rotation. [13] Bicycle drive unit according to claim 7, wherein the freewheel clutch further comprises a preloading element that preloads the engagement pawl to the engagement position. [14] Bicycle drive unit according to claim 13, further comprising: a control element designed to move the engagement pawl to the release position while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [15] Bicycle drive unit according to claim 14, wherein the control part has a contact surface which contacts an inner surface of a recess part of the output element in the circumferential direction in order to transmit the rotation of the crankshaft to the output element while the crankshaft rotates about the first axis of rotation in the second direction of rotation. [16] Bicycle drive unit according to one of claims 7 to 15, wherein the toothed section is arranged on an inner edge surface of the torque transmission part of the torque combination mechanism. [17] Bicycle drive unit according to one of claims 7 to 15, wherein the toothed section is arranged on an outer edge surface of the torque transmission part of the torque combination mechanism.

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