Unit

Abstract

In a unit internally provided with a power transmission mechanism, the inter-stage ratio during gear shifting is reduced. The unit includes an input member, an output member, first to third engagement members, a first planetary gear mechanism in which first to third rotating members are sequentially arranged on a collinear diagram, and a second planetary gear mechanism in which fourth to sixth rotating members are sequentially arranged on the collinear diagram. The input member is connected to the first rotating member and the sixth rotating member, the output member is connected to the second rotating member, one side of the first engaging member is connected to the third rotating member and the fifth rotating member, the other side of the first engaging member is fixed, and the other side of the second engaging member is fixed to the third rotating member. One side of the second engaging member is connected to the fourth rotating member, the other side of the second engaging member is fixed, and the third engaging member connects two rotating members which are selected from among the first to sixth rotating members and are not connected to each other.

Description

Technical Field

[0001] The present invention relates to a unit having a power transmission mechanism therein. Background Art

[0002] Patent Document 1 discloses a two-speed forward electric vehicle automatic transmission unit. In this unit, by switching the engagement states of two friction clutches, a first speed and a second speed with a smaller speed ratio (=input rotation speed / output rotation speed) than the first speed can be realized.

[0003] Patent Documents 2 to 4 also disclose similar units.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: German Patent No. 102019107517

[0007] Patent Document 2: German Patent Application Publication No. 102019119947

[0008] Patent Document 3: German Patent Application Publication No. 102019119949

[0009] Patent Document 4: Chinese Utility Model Specification No. 207333597 Summary of the invention

[0010] Technical problem to be solved by the invention

[0011] In an automatic transmission unit for electric vehicles with two forward gears, the greater the speed ratio of the first gear, the greater the torque amplification effect caused by deceleration. Therefore, the greater the speed ratio of the first gear, the smaller the maximum torque of the motor, and the smaller the motor can be selected. In contrast, the smaller the speed ratio of the second gear, the lower the rotation speed of the motor when achieving a certain vehicle speed, which is beneficial for high-speed cruising.

[0012] However, when the speed ratios of the first gear and the second gear are set separately based on the above design concept, the step ratio (= first gear speed ratio / second gear speed ratio) increases when switching between the first gear and the second gear, and the acceleration / deceleration of the output rotation increases during the speed change.

[0013] The present invention has been made in view of the above-mentioned technical problems, and an object of the present invention is to reduce the step ratio during speed change in a unit having a power transmission mechanism therein.

[0014] Technical solutions for solving technical problems

[0015] According to one aspect of the present invention, the unit has:

[0016] Input components;

[0017] Output components;

[0018] a first engaging member;

[0019] a second engaging member;

[0020] a third engaging member;

[0021] A first planetary gear mechanism, which includes a first rotating member, a second rotating member, and a third rotating member arranged in sequence on a collinear diagram;

[0022] The second planetary gear mechanism includes a fourth rotating member, a fifth rotating member, and a sixth rotating member arranged in sequence on the collinear diagram.

[0023] The input member is connected to the first rotating member and the sixth rotating member.

[0024] The output member is connected to the second rotating member,

[0025] One side of the first engaging member is connected to the third rotating member and the fifth rotating member.

[0026] The other side of the first engaging member is fixed,

[0027] One side of the second engaging member is connected to the fourth rotating member.

[0028] The other side of the second engaging member is fixed,

[0029] The third engaging member connects two rotation members selected from the first to sixth rotation members that are not connected to each other.

[0030] Effects of the Invention

[0031] According to the above method, by changing the engagement state of the first to third engagement members, three or more speed stages can be realized. As a result, the inter-stage ratio is reduced compared to a two-speed forward unit, and the acceleration / deceleration of the output rotation during the speed change can be suppressed to be smaller than that of a two-speed forward unit. In addition, a more appropriate speed ratio can be set in each speed stage.

[0032] When the first and second engagement members are released and the third engagement member is engaged, the speed ratio is 1, and all the rotating members constituting the first and second planetary gear mechanisms rotate at the same rotation speed, thereby reducing power transmission loss caused by the rotation difference between the rotating members. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a skeleton diagram of the units according to the embodiment of the present invention.

[0034] Figure 2 This is an engagement table showing the engagement state of each engagement member at each speed stage.

[0035] Figure 3 is the collinearity diagram of the unit.

[0036] Figure 4A It is a skeleton diagram of a modified example of the unit.

[0037] Figure 4B It is a skeleton diagram of a modified example of the unit.

[0038] Figure 4C It is a skeleton diagram of a modified example of the unit. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the terms used in this specification are defined as follows.

[0040] The term “unit” refers to any device having a power transmission mechanism such as a gear mechanism or a differential gear mechanism inside, and includes a motor unit having a motor and a power transmission mechanism, an automatic transmission unit, a speed reducer unit, and the like.

[0041] The “speed ratio” is the value obtained by dividing the input rotational speed of the unit by the output rotational speed. The “input rotation” includes not only the rotation input to the unit from a power source outside the unit but also the rotation input to the unit from a power source inside the unit.

[0042] The “step ratio” is a value obtained by dividing the larger speed ratio (for low speed) by the smaller speed ratio (for high speed) of two speed ratios realized in the unit.

[0043] “Axial direction” refers to the axial direction of the rotating shaft of an accessory constituting a unit. The accessory is a motor, a gear mechanism, a differential gear mechanism, etc. “Radial direction” refers to the radial direction from the central axis of the rotating shaft.

[0044] The "housing" refers to a housing that contains the motor, inverter, and power transmission mechanism, and is composed of one or more housings. The method of integrally forming a housing that contains the motor, the inverter, and the power transmission mechanism is called "three-in-one".

[0045] The term "motor" refers to a rotating electrical machine having a motor function, and may have a generator function in addition to the motor function.

[0046] “Component A is connected to component B” means that component A is connected to component B upstream or downstream in a manner that power can be transmitted between component A and component B. The input side of power is upstream, and the output side of power is downstream. The method of connecting component A to component B directly or via other components is not limited, and the connection may be via a clutch or the like.

[0047] “Component A is fixed to component B” includes both a method in which component A is directly fixed to component B and a method in which component A is fixed to component B via another component C other than components A and B. “Component A is fixed” means that component A is fixed to another component and cannot rotate.

[0048] “Component A and component B overlap in a predetermined direction” means that component A and component B are arranged in a predetermined direction (axial direction, radial direction, gravity direction, etc.), and when viewed from the predetermined direction, component A and component B at least partially overlap. This is the same as “component A and component B overlap in a predetermined direction”. When component A and component B overlap in an axial direction, component A and component B are coaxial. When component A and component B are arranged in a predetermined direction in a drawing, component A and component B overlap in a predetermined direction.

[0049] In contrast, “components A and B do not overlap in a predetermined direction” means that components A and B are not arranged in a predetermined direction (axial direction, radial direction, gravity direction, vehicle travel direction, etc.), and there is no overlap between components A and B when viewed from a predetermined direction. This is the same as “components A and B do not overlap in a predetermined direction”. In the drawings, components A and B are not arranged in a predetermined direction but are drawn, which means that components A and B do not overlap in a predetermined direction.

[0050] “Component A is located between component B and component C in a predetermined direction” means that component A is located between component B and component C when viewed from a predetermined direction (axial direction, radial direction, gravity direction, etc.). For example, when component B, component A, and component C are arranged in sequence along the axial direction, component A is located between component B and component C in a radial perspective, so component A can be said to be located between component B and component C. Component A does not need to overlap with components B and C in an axial perspective. The case where component A is drawn between component B and component C in a drawing means that component A is located between component B and component C in a predetermined direction.

[0051] "Closely arranged" means that two components overlap each other in an axial or radial perspective, and no other components are inserted between the two components. For example, "two engaging components are closely arranged" means that no planetary gear mechanism is arranged between the two engaging components. In the drawings, when no other components are drawn between component A and component B, it means that component A and component B are closely arranged.

[0052] “One side of the engaging component” and “the other side of the engaging component” refer to two components included in the engaging component that cannot rotate relative to each other when the engaging component is in the engaged state and can rotate relative to each other when the engaging component is in the released state. “One side of the engaging component” and “the other side of the engaging component” can be a combination of rotating components, or a combination of a rotating component and a non-rotating component. Usually, the former is called a clutch, and the latter is called a brake. In addition, “one side of the engaging component” refers to any one of “one side of the engaging component” and “the other side of the engaging component”.

[0053] Other terms are defined as appropriate in the main text of the specification.

[0054] Figure 1 1 is a frame diagram showing the basic structure of a unit 100 according to an embodiment of the present invention. The unit 100 is a three-speed forward automatic transmission unit for an electric vehicle that changes the speed of rotation input from a motor (not shown) as a power source to an input member IN at a speed ratio corresponding to the speed stage, and transmits the rotation from an output member OUT to a drive wheel (not shown). In this example, both the input member IN and the output member OUT are rotating shafts.

[0055] The unit 100 is a so-called three-in-one unit that accommodates an input member IN, first and second planetary gear mechanisms PG1 and PG2, first to third engagement members B1, B2, and CL, an output member OUT, and a motor and inverter (not shown) in a housing 1. The housing 1 is fixed to the vehicle in a non-rotatable manner.

[0056] One end of the input component IN is connected to the output shaft of the motor, and the input component IN rotates using the power input from the motor. The rotation speed of the input component IN is the input rotation speed of the unit 100. The motor is used as an electric motor, and is electrically connected to a battery (not shown) outside the unit 100 via an inverter to receive power supply from the battery. In addition, the motor can also be used as a generator.

[0057] The first planetary gear mechanism PG1 is a single pinion planetary gear mechanism having a first sun gear S1 as a first rotating component, a plurality of first pinion gears (not shown), a first carrier C1 as a second rotating component rotatably supporting the plurality of first pinion gears, and a first internal ring gear R1 as a third rotating component. The first sun gear S1 meshes with the plurality of first pinion gears, and the plurality of first pinion gears mesh with the first internal ring gear R1.

[0058] The second planetary gear mechanism PG2 is a single pinion planetary gear mechanism having a second sun gear S2 as a fourth rotating member, a plurality of second pinion gears (not shown), a second planet carrier C2 as a fifth rotating member rotatably supporting the plurality of second pinion gears, and a second internal ring gear R2 as a sixth rotating member. The second sun gear S2 meshes with the plurality of second pinion gears, and the plurality of second pinion gears mesh with the second internal ring gear R2.

[0059] The first sun gear S1 is connected to the input member IN and the second ring gear R2. The first planetary carrier C1 is connected to the output member OUT. The first ring gear R1 is connected to the second planetary carrier C2.

[0060] The rotation speed of the output component OUT is the output rotation speed of the unit 100 .

[0061] The first engaging component B1 is a brake. The first engaging component B1 is composed of a hydraulic or electric clutch. When the two parts of the first engaging component B1 to be engaged are used as one side and the other side, one side is connected to the first internal gear ring R1 and the second planetary carrier C2, and the other side is fixed to the housing 1. Therefore, as long as the first engaging component B1 is engaged, the first internal gear ring R1 and the second planetary carrier C2 can be fixed to the housing 1.

[0062] The second engaging component B2 is a brake. The second engaging component B2 is composed of a hydraulic or electric clutch. When the two parts of the engaged second engaging component B2 are used as one side and the other side during the engagement state of the second engaging component B2, one side is connected to the second sun gear S2, and the other side is fixed to the housing 1. Therefore, as long as the second engaging component B2 is engaged, the second sun gear S2 can be fixed to the housing 1.

[0063] The third engagement member CL is a clutch. The third engagement member CL is composed of an electric multi-disc clutch.

[0064] The third engagement member CL includes a hub 11 , inner friction plates 12 and outer friction plates 13 that are alternately arranged, a roller 14 , and an electric actuator 15 .

[0065] The inner friction plate 12 is splined to the outer periphery of the hub 11 and is relatively displaceable in the axial direction but not rotatable relative to the hub 11. The hub 11 is splined to the input member IN and is not rotatable relative to the input member IN.

[0066] The outer friction plate 13 is spline-fitted to the inner periphery of the drum 14, and the outer friction plate 13 is relatively displaceable but non-rotatable with respect to the drum 14. The drum 14 is connected to the first carrier C1 and the output member OUT.

[0067] The electric actuator 15 is an actuator that drives the third engagement member CL. When the motor built into the electric actuator 15 is driven, the piston 15p is sent out in the axial direction, pressing the inner friction plate 12 and the outer friction plate 13 so that they cannot rotate relative to each other, and the third engagement member CL is in an engagement state. In addition to applying a mechanical force to the piston 15p, the electric actuator 15 also receives a reaction force from the piston 15p, thereby fixing the electric actuator 15 to the housing 1.

[0068] Furthermore, when the motor built into the electric actuator 15 is driven in the reverse direction, the piston 15p moves backward, the inner friction plate 12 and the outer friction plate 13 are separated, and the third engagement member CL is brought into a released state.

[0069] It should be noted that a hydraulic actuator that uses hydraulic pressure to push out the piston 15p may be used instead of the electric actuator 15. The supply of oil to the hydraulic actuator may be performed by a hydraulic supply unit mounted on the housing 1 or the like, or by a control valve unit formed of a slide valve, a solenoid valve or the like.

[0070] When the two parts of the third engaging member CL that are engaged are respectively one side (the hub 11) and the other side (the roller 14), one side is connected to the input member IN, the first sun gear S1, and the second internal gear ring R2, and the other side is connected to the first planetary carrier C1 and the output member OUT. Therefore, as long as the third engaging member CL is engaged, the input member IN, the first sun gear S1, and the second internal gear ring R2 are connected to the first planetary carrier C1 and the output member OUT.

[0071] Furthermore, by connecting the first sun gear S1 and the first carrier C1 by the third engagement member CL, it is not necessary to arrange the third engagement member CL between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, thereby facilitating layout design.

[0072] The actuators that can be used in the third engagement member CL include actuators that are easily restricted by layout (electric actuators that need to be fixed to the housing 1 etc. by utilizing the relationship of reaction force, hydraulic actuators that need to install a hydraulic supply unit on the housing 1 etc.), and actuators that are not easily restricted by layout (hydraulic actuators that supply hydraulic pressure from a control valve unit etc.). When the former actuator is used, if the third engagement member CL needs to be arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, the difficulty of layout design increases.

[0073] Regarding this point, as long as Figure 1 By configuring as shown, it is possible to facilitate layout design without depending on the type of actuator, and the degree of freedom in selecting the actuator that drives the third engagement member CL is increased.

[0074] In addition, by configuring the second planetary gear mechanism PG2 on one axial side of the first planetary gear mechanism PG1 and configuring the third engaging member CL on the other axial side of the first planetary gear mechanism PG1, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are arranged close to each other. This increases the layout freedom of other components and reduces the axial dimension of the unit 100.

[0075] The third engagement member CL is arranged coaxially with the first and second planetary gear mechanisms PG1 and PG2 and has a portion overlapping with the first planetary gear mechanism PG1 and a portion overlapping with the second planetary gear mechanism PG2 in an axial view.

[0076] Figure 2 : is an engagement table showing the relationship between the engagement states of the first to third engagement members B1, B2, CL and the speed stages realized in the unit 100. In the table, a black circle indicates an engaged state, and a blank indicates a released state.

[0077] As shown in the engagement table, the first gear is achieved by engaging the first engagement component B1 and releasing the second and third engagement components B2 and CL. The second gear is achieved by engaging the second engagement component B2 and releasing the first and third engagement components B1 and CL. The third gear is achieved by engaging the third engagement component CL and releasing the first and second engagement components B1 and B2.

[0078] in addition, Figure 3It is a co-linear diagram of unit 100. In the accompanying figure, vertical lines l1 to l4 correspond to the rotating parts of the first and second planetary gear mechanisms PG1 and PG2. With respect to the first planetary gear mechanism PG1, the first sun gear S1, the first planetary carrier C1, and the first internal gear ring R1 are arranged in sequence from the left side of the figure. With respect to the second planetary gear mechanism PG2, the second sun gear S2, the second planetary carrier C2, and the second internal gear ring R2 are arranged in sequence from the right side of the figure.

[0079] Since the first sun gear S1 and the second inner ring gear R2 are connected to each other, they correspond to the same longitudinal line l1. Similarly, since the first inner ring gear R1 and the second planetary carrier C2 are also connected to each other, they correspond to the same longitudinal line l3. When the interval between the longitudinal line l1 and the longitudinal line l2 is 1, the interval α1 between the longitudinal line l2 and the longitudinal line l3 is the value obtained by dividing the number of teeth of the first sun gear S1 by the number of teeth of the first inner ring gear R1. In addition, when the interval between the longitudinal line l4 and the longitudinal line l3 is 1, the interval α2 between the longitudinal line l3 and the longitudinal line l1 is the value obtained by dividing the number of teeth of the second sun gear S2 by the number of teeth of the second inner ring gear R2.

[0080] Straight lines L1 to L3 corresponding to the respective speed stages are plotted in the collinear diagram. The rotation speed of each rotating member is represented by the ordinate of the intersection of the straight lines L1 to L3 corresponding to the respective speed stages and the ordinates l1 to l4.

[0081] In the first gear, the first engagement member B1 is engaged to fix the first ring gear R1 and the second carrier C2 to the case 1. The rotation speeds of the first ring gear R1 and the second carrier C2 are zero. Therefore, the straight line L1 corresponding to the first gear is a straight line passing through the point X1.

[0082] When the rotation speed of the first sun gear S1 and the second inner ring gear R2 is r4, and the rotation speed of the first planetary carrier C1 is r1, the input rotation speed rin of unit 100 is the same as the rotation speed r4 of the first sun gear S1 and the second inner ring gear R2, and the output rotation speed rout is the same as the rotation speed r1 of the first planetary carrier C1, so the speed ratio of the first gear is rin / rout=r4 / r1.

[0083] In the second gear, the second sun gear S2 is fixed to the case 1 by engaging the second engagement member B2, and the rotation speed of the second sun gear S2 is zero. Therefore, the straight line L2 corresponding to the second gear is a straight line passing through the point X2.

[0084] When the rotation speed of the first sun gear S1 and the second inner gear ring R2 is set to r4, and the rotation speed of the first planetary carrier C1 is set to r2, the input rotation speed rin of the unit 100 is the same as the rotation speed r4 of the first sun gear S1 and the second inner gear ring R2, and the output rotation speed rout is the same as the rotation speed r2 of the first planetary carrier C1, so the speed ratio of the second gear is rin / rout = r4 / r2. Since r2 is larger than r1, the speed ratio of the second gear is smaller than the speed ratio of the first gear.

[0085] In the third gear, the input member IN, the first sun gear S1 and the second ring gear R2 are connected to the first planetary carrier C1 and the output member OUT by engaging the third engagement member CL, so that the rotation speeds of all the rotating members are the same, that is, r3. As a result, the input rotation speed rin and the output rotation speed rout are also the same, and the speed ratio of the third gear is 1, which is smaller than that of the second gear.

[0086] Therefore, since the unit 100 can realize three speed stages including the third stage with a speed ratio of 1, the step ratio is reduced compared with the unit with two speeds, and the acceleration / deceleration of the output rotation during the speed change can be suppressed to be smaller than that of the unit with two speeds. In addition, since the first to third gears can be used for low speed, medium speed, and high speed, respectively, an appropriate speed ratio can be set according to the speed range.

[0087] In addition, in the third gear, the speed ratio is 1. That is, since all the rotating parts constituting the first and second planetary gear mechanisms PG1 and PG2 rotate at the same rotation speed, the power transmission loss caused by the rotation difference between the rotating parts can be reduced. In addition, the input part IN is connected to the output part OUT, and the power transmission line from the input part IN to the output part OUT is the shortest, which can further reduce the power transmission loss.

[0088] Next, a modification of the unit 100 will be described.

[0089] Figure 4A to Figure 4C is a schematic diagram of a modified example of the unit 100. Figure 1 The difference between the frame diagram shown is the position of the third engaging part CL. Figure 1 The same reference numerals are used for the same components in the frame diagram shown.

[0090] Since the third engaging member CL can achieve a speed ratio of 1 by engagement, the position of the third engaging member CL can also be Figure 1 other than those shown.

[0091] Specifically, in order to Figure 3In the collinear diagram shown, to achieve a speed ratio of 1, the straight line L3 corresponding to the third gear can be horizontal, so any two vertical lines can be selected from the four vertical lines, and the rotating parts corresponding to the selected two vertical lines can be connected to each other.

[0092] In other words, from all combinations of two rotating parts selected from the six rotating parts S1, C1, R1, S2, C2, R2 of the first and second planetary gear mechanisms PG1 and PG2, the already connected combinations (the first sun gear S1 and the second ring gear R2, and the first ring gear R1 and the second planetary carrier C2) can be removed, and a combination of two rotating parts that are not connected to each other can be selected, and the above two rotating parts can be connected.

[0093] exist Figure 4A In the modified example shown, the third engaging member CL is arranged at a position that enables the input member IN, the first sun gear S1, and the second inner ring gear R2 to be connected to the second sun gear S2. Specifically, one side (hub 11) of the third engaging member CL is connected to the input member IN, the first sun gear S1, and the second inner ring gear R2, and the other side (roller 14) is connected to one side of the second engaging member B2 and the second sun gear S2.

[0094] This arrangement is suitable for a layout design in which the third engagement member CL is not arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. In addition, the freedom of selecting an actuator that drives the third engagement member CL can be increased unless the third engagement member CL is arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2.

[0095] As an actuator for driving the third engagement member CL, an actuator similar to Figure 1 The electric actuator 15 in the illustrated example may also be a hydraulic actuator supplied with hydraulic pressure from a hydraulic pressure supply unit or a control valve unit mounted on the housing 1 or the like.

[0096] Furthermore, the first planetary gear mechanism PG1 is arranged on one axial side of the second planetary gear mechanism PG2 , and the third engagement member CL is arranged on the other axial side of the second planetary gear mechanism PG2 .

[0097] Since the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are arranged close to each other, the degree of freedom in layout of other components increases, and the axial dimension of the unit 100 can be reduced.

[0098] In addition, since one side (drum 14) of the third engagement member CL is connected to one side of the second engagement member B2, they can be used as a shared component (integrated component). Thus, the number of components of the unit 100 can be reduced.

[0099] The third engagement member CL is arranged coaxially with the first and second planetary gear mechanisms PG1 and PG2 and has a portion overlapping with the first planetary gear mechanism PG1 and a portion overlapping with the second planetary gear mechanism PG2 in an axial view.

[0100] exist Figure 4B In the modified example shown, the third engaging member CL is arranged at a position capable of connecting the input member IN, the first sun gear S1 and the second inner ring gear R2 to the first planetary carrier C1 and the output member OUT. Specifically, one side (hub 11) of the third engaging member CL is connected to the input member IN, the first sun gear S1 and the second inner ring gear R2, and the other side (drum 14) is connected to the first planetary carrier C1 and the output member OUT.

[0101] In this arrangement, the third engagement element CL is arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. Therefore, as an actuator for driving the third engagement element CL, the hydraulic actuator 16 which has few layout restrictions and to which hydraulic pressure is supplied from the control valve unit is preferably used.

[0102] The third engagement member CL is arranged coaxially with the first and second planetary gear mechanisms PG1 and PG2 and has a portion overlapping with the first planetary gear mechanism PG1 and a portion overlapping with the second planetary gear mechanism PG2 in an axial view.

[0103] Furthermore, when the third engagement member CL is engaged, in addition to achieving a speed ratio of 1, the input member IN is connected to the output member OUT. Therefore, the power transmission line from the input member IN to the output member OUT is the shortest, and the power transmission loss can be further reduced.

[0104] exist Figure 4C In the modified example shown, the third engaging member CL is arranged at a position capable of connecting the input member IN, the first sun gear S1, and the second inner ring gear R2 to the first inner ring gear R1 and the second planetary carrier C2. Specifically, one side (hub 11) of the third engaging member CL is connected to the input member IN, the first sun gear S1, and the second inner ring gear R2, and the other side (roller 14) is connected to one side of the first engaging member B1, the first inner ring gear R1, and the second planetary carrier C2.

[0105] In this arrangement, the third engagement element CL is arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. Therefore, as an actuator for driving the third engagement element CL, the hydraulic actuator 16 which has few layout restrictions and to which hydraulic pressure is supplied from the control valve unit is preferably used.

[0106] The third engagement member CL is provided coaxially with the first and second planetary gear mechanisms PG1 and PG2 and has a portion overlapping with the first planetary gear mechanism PG1 and a portion overlapping with the second planetary gear mechanism PG2 in an axial view.

[0107] In addition, since one side (drum 14) of the third engagement member CL is connected to one side of the first engagement member B1, they can be a shared component (integrated component). Thus, the number of components of the unit 100 can be reduced.

[0108] Figure 4A to Figure 4C The matching table and collinear diagram of the modified example shown are Figure 2 , Figure 3 shown Figure 1 The framework diagram is the same.

[0109] Next, the effects of the embodiment of the present invention will be described.

[0110] (1) The unit 100 according to the embodiment of the present invention has:

[0111] Input component IN;

[0112] Output component OUT;

[0113] A first engaging member B1;

[0114] A second engaging member B2;

[0115] A third engaging member CL;

[0116] A first planetary gear mechanism PG1, which includes a first sun gear S1, a first planet carrier C1, and a first ring gear R1 arranged in sequence on a collinear diagram;

[0117] The second planetary gear mechanism PG2 includes a second sun gear S2, a second planet carrier C2, and a second ring gear R2 arranged in sequence on the collinear diagram.

[0118] The input member IN is connected to the first sun gear S1 and the second ring gear R2.

[0119] The output component OUT is connected to the first planet carrier C1.

[0120] One side of the first engagement member B1 is connected to the first ring gear R1 and the second carrier C2.

[0121] The other side of the first engaging member B1 is fixed.

[0122] One side of the second engagement member B2 is connected to the second sun gear S2.

[0123] The other side of the second engaging member B2 is fixed.

[0124] The third engaging member CL connects two rotating members selected from the first sun gear S1, the first carrier C1, the first ring gear R1, the second sun gear S2, the second carrier C2, and the second ring gear R2 that are not connected to each other.

[0125] According to this structure, by changing the engagement state of the first to third engagement components B1, B2, CL, three or more speed stages can be realized. As a result, the inter-stage ratio is reduced compared to a two-speed forward unit, and the acceleration / deceleration of the output rotation during the speed change can be suppressed to be smaller than that of a two-speed forward unit. In addition, a more appropriate speed ratio can be set at each speed stage.

[0126] Furthermore, when the first and second engagement members B and B2 are released and the third engagement member CL is engaged, the speed ratio is 1 and all the rotating members constituting the first and second planetary gear mechanisms PG1 and PG2 rotate at the same rotation speed, thereby reducing power transmission loss caused by the rotation difference between the rotating members.

[0127] (2) In addition, Figure 1 In the illustrated example, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single pinion planetary gear mechanisms, and the third engagement member CL connects the first sun gear S1 and the first carrier C1.

[0128] This arrangement is suitable for a layout design in which the third engagement member CL is not arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. In addition, the freedom of selecting an actuator that drives the third engagement member CL can be increased unless the third engagement member CL is arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2.

[0129] Furthermore, when the third engagement member CL is engaged, in addition to achieving a speed ratio of 1, the input member IN is connected to the output member OUT. Therefore, the power transmission line from the input member IN to the output member OUT is the shortest, and the power transmission loss can be further reduced.

[0130] (3) In addition, Figure 1In the illustrated example, the second planetary gear mechanism PG2 is arranged on one axial side of the first planetary gear mechanism PG1 , and the third engagement member CL is arranged on the other axial side of the first planetary gear mechanism PG1 .

[0131] According to this configuration, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are arranged close to each other. This increases the degree of freedom in layout of other components and also enables the axial dimension of the unit 100 to be reduced.

[0132] (4) In addition, Figure 4A In the illustrated example, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single pinion planetary gear mechanisms, and the third engagement member CL connects the first sun gear S1 and the second sun gear S2 .

[0133] This arrangement is suitable for a layout design in which the third engagement member CL is not arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. In addition, the freedom of selecting an actuator that drives the third engagement member CL can be increased unless the third engagement member CL is arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2.

[0134] (5) In addition, Figure 4A In the illustrated example, the first planetary gear mechanism PG1 is arranged on one axial side of the second planetary gear mechanism PG2 , and the third engagement member CL is arranged on the other axial side of the second planetary gear mechanism PG2 .

[0135] According to this configuration, since the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are arranged close to each other, the degree of freedom in layout of other components is increased, and the axial dimension of the unit 100 can be reduced.

[0136] (6) In addition, Figure 1 , Figure 4A to Figure 4C In the example shown, the third engagement member CL has a portion overlapping with the first planetary gear mechanism PG1 in the axial view. Also, the third engagement member CL has a portion overlapping with the second planetary gear mechanism PG2 in the axial view.

[0137] Thus, the radial dimension of the unit 100 can be reduced.

[0138] (7) In addition, Figure 4A , Figure 4C In the example shown, one side (drum 14) of the third engagement member CL is connected to one side of the first engagement member B1 or one side of the second engagement member B2.

[0139] According to this configuration, one side of the third engagement component CL and one side of the first engagement component B1 or one side of the second engagement component B2 can be used as a shared component (integrated component), thereby reducing the number of components of the unit 100 .

[0140] Although the embodiments of the present invention have been described above, the above embodiments are merely application examples of the present invention and are not intended to limit the technical scope of the present invention to the specific structures of the above embodiments.

[0141] For example, Figure 1 , Figure 4A to Figure 4C The illustrated framework diagram is a part of an application example of the present invention, and the framework diagram of the unit to which the present invention is applied is not limited thereto.

[0142] Furthermore, although the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single-pinion planetary gear mechanisms, they may be double-pinion planetary gear mechanisms.

[0143] Description of Reference Numerals

[0144] 1 housing; 100 units; B1 first engaging member; B2 second engaging member; CL third engaging member; S1 first sun gear (first rotating member); C1 first planetary carrier (second rotating member); R1 first internal ring gear (third rotating member); S2 second sun gear (fourth rotating member); C2 second planetary carrier (fifth rotating member); R2 second internal ring gear (sixth rotating member); IN input member; OUT output member; PG1 first planetary gear mechanism; PG2 second planetary gear mechanism.

Claims

1. A unit, characterized in that have: Input components; Output components; a first engaging member; a second engaging member; a third engaging member; A first planetary gear mechanism, which includes a first rotating member, a second rotating member, and a third rotating member arranged in sequence on a collinear diagram; A second planetary gear mechanism, wherein a fourth rotating member, a fifth rotating member, and a sixth rotating member are sequentially arranged on the collinear diagram; The input member is connected to the first rotating member and the sixth rotating member. The output member is connected to the second rotating member, One side of the first engaging member is connected to the third rotating member and the fifth rotating member. The other side of the first engaging member is fixed, One side of the second engaging member is connected to the fourth rotating member. The other side of the second engaging member is fixed, The third engaging member connects two rotation members selected from the first to sixth rotation members that are not connected to each other.

2. The unit according to claim 1, characterized in that The first planetary gear mechanism and the second planetary gear mechanism are single pinion planetary gear mechanisms, The third engaging member connects the first rotating member and the second rotating member.

3. The unit according to claim 2, characterized in that The second planetary gear mechanism is arranged on one axial side of the first planetary gear mechanism. The third engagement member is arranged on the other axial side of the first planetary gear mechanism.

4. The unit according to claim 1, characterized in that The first planetary gear mechanism and the second planetary gear mechanism are single pinion planetary gear mechanisms, The third engaging member connects the first rotating member and the fourth rotating member.

5. The unit according to claim 4, characterized in that The first planetary gear mechanism is arranged on one axial side of the second planetary gear mechanism. The third engagement member is arranged on the other axial side of the second planetary gear mechanism.

6. A unit according to claim 3 or 5, characterized in that In the axial perspective, the third engaging member has a portion overlapping with the first planetary gear mechanism. The third engaging member has a portion overlapping with the second planetary gear mechanism in an axial view.

7. The unit according to claim 1, characterized in that One side of the third engaging member is connected to one side of the first engaging member or one side of the second engaging member.

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