Motor drive unit

Abstract

To enable a mounted part to be driven, even when hybridizing a vehicle by connecting a motor to a PTO shaft.SOLUTION: A motor driving device 100 for outputting driving force of a motor for a hybrid vehicle is provided with: a motor 21; a first output shaft 22 configured to be connected to a PTO shaft for taking out driving force of an engine for the hybrid vehicle; a power transmitting mechanism 23 that connects the motor to the first output shaft; a second output shaft 24 configured to be connected to a power source 11 of a mounted object loaded on the hybrid vehicle; and a switching mechanism 25 configured to selectively connect the first output shaft to the second output shaft.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a motor drive device for outputting motor driving force for a hybrid vehicle. [Background technology]

[0002] For example, in a vehicle such as a truck, an electric motor may be connected to a PTO (Power Take Off) shaft for extracting engine driving force, thereby converting the vehicle into a hybrid vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-32754 Summary of the Invention [Problem to be solved by the invention]

[0004] However, this means that the PTO shaft cannot be used to drive the mounted equipment on the vehicle. In other words, the PTO shaft is used to transmit the motor driving force, so the PTO shaft cannot be used for its original purpose of driving the mounted equipment.

[0005] Therefore, the present disclosure was devised in consideration of such circumstances, and its purpose is to provide a motor drive device that can drive mounted equipment even when a motor is connected to the PTO shaft to make the vehicle hybrid. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, A motor drive device for outputting motor drive force for a hybrid vehicle, comprising: A motor; a first output shaft configured to be connected to a PTO shaft for extracting engine driving force from the hybrid vehicle; a power transmission mechanism that connects the motor and the first output shaft; A second output shaft configured to be connected to a drive source of an attached object mounted on the hybrid vehicle; a switching mechanism configured to selectively connect the first output shaft to the second output shaft; A motor drive device is provided, comprising:

[0007] Preferably, the first output shaft and the second output shaft are arranged coaxially, The switching mechanism is a first spline provided on an outer periphery of the first output shaft; a second spline provided on an outer periphery of the second output shaft; a sleeve movable between a second position in which it meshes with only the second spline and a first position in which it meshes with both the first spline and the second spline; a sleeve driving member that drives the sleeve; Equipped with.

[0008] Preferably, the switching mechanism includes an actuator that drives the sleeve drive member.

[0009] Preferably, the second output shaft is configured to be coaxially connected to the input shaft of the drive source.

[0010] Preferably, the second output shaft is configured to be directly connected to the input shaft of the drive source.

[0011] Preferably, the second output shaft is configured to be connected to the input shaft of the drive source in an offset state.

[0012] Preferably, the motor drive device includes a housing that accommodates the motor, the first output shaft, the power transmission mechanism, the second output shaft, and the switching mechanism.

[0013] Preferably, the housing has a seat for directly mounting the drive source.

[0014] Preferably, the drive source is a hydraulic pump. [Effects of the Invention]

[0015] According to the present disclosure, even when a motor is connected to the PTO shaft to make the vehicle hybrid, it is possible to drive mounted equipment. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic plan view showing a vehicle to which a motor drive device is applied; [Figure 2] FIG. 2 is a side cross-sectional view showing the motor drive device. [Figure 3] FIG. 3 is an enlarged view of a main part of FIG. 2. [Figure 4] FIG. 4 is a rear view showing the vicinity of the seat of the motor drive device. [Figure 5] FIG. 10 is a schematic diagram showing a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0018] FIG. 1 shows a vehicle V to which a motor drive device 100 according to this embodiment is applied. The vehicle V is a parallel hybrid vehicle (HEV) that can run on either or both of the driving force of an engine (internal combustion engine) 1 and the driving force of an electric motor, and in this embodiment is a commercial vehicle, specifically a truck. However, the type of vehicle is arbitrary. The front, rear, left, right, top, and bottom directions of the vehicle V are indicated in the figure.

[0019] Vehicle V comprises engine 1, clutch assembly 2 connected to the crankshaft of engine 1, automatic transmission 3 connected to the output shaft of clutch assembly 2, propeller shaft 4 connected to the output shaft of automatic transmission 3, final drive unit 5 connected to the output section of propeller shaft 4, and left and right rear wheels 7 connected to the left and right output shafts of final drive unit 5 via axles 6. As indicated by solid arrow a, the driving force of engine 1 is transmitted in this order: clutch assembly 2, automatic transmission 3, propeller shaft 4, final drive unit 5, axles 6, and rear wheels 7. The transmission system for engine driving force from engine 1 to rear wheels 7 is called the engine drive system.

[0020] The clutch assembly 2 includes a torque converter and a lock-up clutch. The automatic transmission 3 is a type that automatically changes gears from a manual transmission using an actuator. The combination of the clutch assembly 2 and the automatic transmission 3 constitutes an AMT (Automated Manual Transmission). The final drive unit 5 includes a differential gear that distributes driving force to the left and right axles 6.

[0021] The automatic transmission 3 is provided with a PTO device 8 for extracting engine driving force. The output shaft of this PTO device 8 is PTO shaft 9. The PTO shaft 9 faces rearward. The output shaft of a motor drive device 100 is connected to this PTO shaft 9 via a propeller shaft 10. A vehicle driving motor is provided in this motor drive device 100. As indicated by the dashed arrow b, the motor driving force is transmitted in this order from the output shaft of the motor drive device 100 to the propeller shaft 10, PTO shaft 9, PTO device 8, and automatic transmission 3, and then to the rear wheels 7 via the same path as described above.

[0022] On the other hand, a mounted object (not shown) is attached to the vehicle V. The mounted object is, for example, a crane, a water pump, or a garbage collection machine, but is not limited to these. A hydraulic pump 11, which is the drive source for the mounted object, is attached to the motor drive device 100. In this embodiment, the vehicle drive motor is used to drive the hydraulic pump 11, thereby operating the mounted object.

[0023] In this embodiment, the propeller shaft 10 is positioned in front of the motor drive device 100, and the hydraulic pump 11 is positioned in the rear of the motor drive device 100. However, this layout is arbitrary, and other arrangements are also possible.

[0024] The vehicle V includes a battery 12 that serves as a power source for the motor, and a motor control device (not shown) that controls the current between the battery 12 and the motor. The motor is a motor generator. The motor control device controls the current that flows from the battery 12 to the motor when the vehicle is driven by the motor, and controls the current that flows from the motor to the battery 12 during regenerative braking.

[0025] Next, motor drive device 100 will be described with reference to Figures 2 and 3. Figure 2 is a left side cross-sectional view showing the entire motor drive device 100, and Figure 3 is an enlarged view of a main part of Figure 2. For convenience, the front, rear, left, right, top and bottom directions are defined as the same as the directions of vehicle V.

[0026] The motor drive device 100 includes the aforementioned motor 21, a first output shaft 22 configured to be connected to the PTO shaft 9, a power transmission mechanism 23 connecting the motor 21 and the first output shaft 22, a second output shaft 24 configured to be connected to the hydraulic pump 11, and a switching mechanism 25 configured to selectively connect the first output shaft 22 to the second output shaft 24.

[0027] In the illustrated example, the first output shaft 22 is actually connected to the PTO shaft 9 via the propeller shaft 10. The second output shaft 24 is actually connected to the input shaft 13 of the hydraulic pump 11.

[0028] In this embodiment, the second output shaft 24 is configured to be coaxially connected to the input shaft 13 of the hydraulic pump 11. The second output shaft 24 is also configured to be directly connected to the input shaft 13 of the hydraulic pump 11.

[0029] The motor drive device 100 includes a housing 26. The housing 26 accommodates the motor 21, the first output shaft 22, the power transmission mechanism 23, the second output shaft 24, and the switching mechanism 25. This allows the motor drive device 100 to be integrated or unitized.

[0030] Within the housing 26, the motor 21 is disposed above the first output shaft 22 and the second output shaft 24, which are disposed coaxially. Reference symbol C1 denotes the central axis of the motor 21, and reference symbol C2 denotes the common central axis of the first output shaft 22 and the second output shaft 24. The axis C1 is parallel to the axis C2 and is positioned above the axis C2. The axes C1 and C2 extend in the front-rear direction.

[0031] The housing 26 includes a housing body 27 and a housing lid 28 attached to the housing body 27 and closing the front open end thereof.

[0032] The motor 21 includes a stator 29 made of a permanent magnet fixed to the housing body 27, and a rotor 31 rotatably attached to the housing body 27 via a pair of bearings 30. The rotor 31 includes a motor output shaft 32 and an electromagnet 33 attached to the outer periphery of the motor output shaft 32.

[0033] In this embodiment, the power transmission mechanism 23 is configured by a chain and sprocket mechanism, but is not limited to this and may be configured by a gear mechanism or the like.

[0034] A drive sprocket 34 is attached to the tip or front end of the motor output shaft 32, and a driven sprocket 35 is attached to the middle portion of the first output shaft 22. A chain 36 is wound around these sprockets 34, 35. The driven sprocket 35 has more teeth than the drive sprocket 34, so that the rotation of the motor 21 is transmitted to the first output shaft 22 at a reduced speed. The drive sprocket 34 is spline-fitted to the motor output shaft 32 and secured in place by a nut 37.

[0035] The first output shaft 22 is rotatably supported by a pair of bearings 38 attached to the housing main body 27 and the housing lid 28, respectively. A cylindrical flange member 39 is attached to the first output shaft 22 adjacent to the front side of the driven sprocket 35. The driven sprocket 35 and flange member 39 are spline-fitted to the first output shaft 22 and fixed in place by a nut 40. A first seal member 41 seals the gap between the flange member 39 and the housing lid 28.

[0036] The flange member 39 protrudes forward from the housing lid 28, and a flange 42 of the propeller shaft 10 is fixed to the flange member 39 by a plurality of bolts 43 (only one is shown).

[0037] The driven sprocket 35 is disposed between the pair of bearings 38. On the other hand, the base end or rear end of the first output shaft 22 protrudes rearward from the rear bearing 38. At this protruding rear end, the first output shaft 22 can be connected to the second output shaft 24 by a switching mechanism 25.

[0038] The base end or rear end of the first output shaft 22 is formed in a generally cylindrical shape with an open rear end. A first spline 44 is provided on the outer periphery of the rear end, and a reduced diameter tubular portion 45 is provided behind the first spline 44.

[0039] The second output shaft 24 is also formed in a substantially cylindrical shape, and its interior is divided into front and rear sections by a partition wall 46. A front pipe section 47 located forward of the partition wall 46 is fitted onto the outside of the reduced diameter pipe section 45 with a gap therebetween, and is rotatably supported by the reduced diameter pipe section 45 via a plurality of needle bearings 48.

[0040] A second spline 49 similar to the first spline 44 is provided coaxially adjacent to the rear of the first spline 44 on the outer periphery of the front tube portion 47 .

[0041] A rear pipe portion 50 located rearward of the partition wall 46 is rotatably supported by the housing body 27 via a bearing 51 .

[0042] The housing main body 27 is formed with a tubular portion 52 that protrudes into the housing to support the first output shaft 22 and the second output shaft 24. Bearings 38 and 51 are attached to this tubular portion 52. The right end of the tubular portion 52 is open, and a gap between the inner circumferential surface of the tubular portion 52 and the second output shaft 24 is sealed by a seal member 53.

[0043] The hydraulic pump 11 is attached directly to the rear end surface of the housing body 27 with a plurality of stud bolts 54 and nuts 55, with its input shaft 13 facing forward.

[0044] 4, a seat 56 is formed on the rear end surface of the housing main body 27 for seating or surface contact with the front end surface of the hydraulic pump 11. In this embodiment, the seat 56 is formed in a generally spindle shape, and a flange 57 of the hydraulic pump 11, which has a generally identical shape, is seated on this seat 56. The flange 57 is fixed in close contact with the seat 56 of the housing main body 27 by two pairs of stud bolts 54 and nuts 55 arranged diagonally.

[0045] The input shaft 13 of the hydraulic pump 11 is inserted into the tubular portion 52 and is coaxially fitted inside the rear tubular portion 50 of the second output shaft 24. Key grooves 58, 59 are formed in the input shaft 13 of the hydraulic pump 11 and the rear tubular portion 50 of the second output shaft 24, respectively. A key 60 is inserted into these key grooves 58, 59, and the input shaft 13 and the rear tubular portion 50 are connected so as to be movable in the direction of axis C2 but immovable in the rotational direction.

[0046] The switching mechanism 25 includes the first spline 44 and the second spline 49 described above, a sleeve 61, and a sleeve drive member 62 that drives the sleeve 61. The sleeve 61 is movable between a second position P2 (shown by a solid line) where it meshes with only the second spline 49, and a first position P1 (shown by a virtual line) where it meshes with both the first spline 44 and the second spline 49.

[0047] The switching mechanism 25 also includes an actuator 63 that drives the sleeve driving member 62 .

[0048] This embodiment employs a switching mechanism 25 similar to that used in a manual transmission for a vehicle. The sleeve 61 is ring-shaped, has splines formed on its inner periphery, and is normally fitted around the second spline 49 so as to be movable in the direction of the axis C2 but immovable in the rotational direction. A fork groove 61A is formed on the outer periphery of the sleeve 61.

[0049] The sleeve drive member 62 includes a shift fork 64 having a tip engaged with the fork groove 61A, a fork rod 65 to which the base end of the shift fork 64 is fixed, and a coil spring 66 as a biasing member that biases the shift fork 64 and the fork rod 65 toward the second position P2.

[0050] The shift fork 64 extends vertically, with its base end positioned higher than its tip end. An insertion hole 67 is provided in the tubular portion 52 of the housing main body 27, through which the shift fork 64 is inserted. The fork rod 65 is slidably inserted in the direction of axis C3 through guide holes 68, 69 provided in the housing main body 27 and the housing lid 28, respectively. The axis C3 is parallel to the axis C2.

[0051] The coil spring 66 is fitted onto the outside of the fork rod 65 and is sandwiched in a compressed state between the housing cover body 28 and the shift fork 64, urging the shift fork 64 toward the second position P2 and pressing it against the stopper surface 70 of the housing main body 27.

[0052] In this embodiment, the actuator 63 is configured by an electromagnetic solenoid that drives the fork rod 65 in the direction of axis C3. The actuator 63 is attached to the front end surface of the housing lid 28, and the front end of the fork rod 65 is inserted into it. The solid line in the figure indicates the state when the actuator 63 is off (stopped). When the actuator 63 is turned on (activated), the actuator 63 attracts and pulls the fork rod 65 forward in the direction of axis C3, moving the fork rod 65 and sleeve 61 to a first position P1 as shown by the imaginary line.

[0053] Next, the operation of the motor driving device 100 will be described.

[0054] During normal driving of the vehicle V, the actuator 63 is turned off, the sleeve 61 is positioned at the second position P2, and is engaged only with the second spline 49. This separates the first output shaft 22 and the second output shaft 24 from each other and allows them to rotate relative to each other.

[0055] The PTO device 8 is equipped with a PTO clutch, which can be engaged or disengaged to connect or disconnect the PTO shaft 9 to or from the automatic transmission 3. During normal driving of the vehicle V, the PTO clutch is engaged, thereby connecting the PTO shaft 9 to the automatic transmission 3 so that power can be transmitted. The on / off state of the actuator 63 and the engaged or disengaged state of the PTO clutch can be easily switched by operating a switch in the driver's cab, for example.

[0056] When the motor 21 is driven in this state, the rotational driving force of the motor 21 is transmitted to the first output shaft 22 via the motor output shaft 32, drive sprocket 34, chain 36, driven sprocket 35, and first output shaft 22. The rotational driving force is then transmitted from the first output shaft 22 to the automatic transmission 3 via the propeller shaft 10, PTO shaft 9, PTO device 8, and automatic transmission 3, and is then finally transmitted to the rear wheels 7.

[0057] As with a normal parallel hybrid vehicle, the rear wheels 7 can be driven by a combination of the driving force of the engine 1 and the driving force of the motor 21. Alternatively, when the vehicle V decelerates, the motor 21 can be driven by the rear wheels 7, and regenerative braking can be performed in which the electric power generated by the motor 21 is recovered in the battery 12. In addition, the engine 1 and the motor 21 can be controlled in various control modes that are normally used in parallel hybrid vehicles.

[0058] During normal running of the vehicle V, the second output shaft 24 is separated from the first output shaft 22, so the second output shaft 24 does not rotate and the hydraulic pump 11 is not operated. Therefore, the mounted equipment is also stopped.

[0059] On the other hand, when the mounted equipment is in operation, the vehicle V is stopped, the actuator 63 is turned on, the sleeve 61 is positioned at the first position P1, and is engaged with both the first spline 44 and the second spline 49. As a result, the first output shaft 22 and the second output shaft 24 are connected to each other and cannot rotate relative to each other.

[0060] In addition, the PTO clutch is disengaged, which disables the PTO shaft 9 from transmitting power to the automatic transmission 3, and the rotational driving force of the motor 21 is no longer transmitted to the automatic transmission 3.

[0061] When the motor 21 is driven in this state, the rotational driving force of the motor 21 is transmitted to the input shaft 13 of the hydraulic pump 11 via the motor output shaft 32, drive sprocket 34, chain 36, driven sprocket 35, first output shaft 22, sleeve 61, second output shaft 24, and input shaft 13. This operates the hydraulic pump 11, and the mounted object.

[0062] As described above, according to this embodiment, even when the motor 21 is connected to the PTO shaft 9 to make the vehicle V a hybrid, it is possible to drive mounted equipment.

[0063] Furthermore, if the motor 21 stops operating due to an electrical problem or the like, the sleeve 61 can be positioned at the first position P1 to directly connect the first output shaft 22 and the second output shaft 24, allowing the engine 1 to drive the hydraulic pump 11 like a normal PTO. In this case, the driving force of the engine 1 is transmitted to the input shaft 13 of the hydraulic pump 11 via the automatic transmission 3, PTO device 8, PTO shaft 9, propeller shaft 10, first output shaft 22, sleeve 61, second output shaft 24, and input shaft 13.

[0064] Even if an abnormality occurs in which the motor 21 does not operate in this way, the hydraulic pump 11 and the mounted equipment can be operated by the engine 1, thereby achieving a fail-safe function.

[0065] Furthermore, when the motor 21 is operating normally, the hydraulic pump 11 and the mounted equipment can be intentionally operated by the engine 1. In this case, the motor 21 is driven to rotate, so that the motor 21 can function as a generator to charge the battery 12.

[0066] Incidentally, if a vehicle is converted into a hybrid by connecting a vehicle drive motor to the PTO shaft, it is possible to install an additional motor dedicated to the mounted equipment. However, this increases the number of motors, which increases manufacturing costs and reduces marketability due to the reduced vehicle space.

[0067] According to this embodiment, the vehicle drive motor 21 is also used to drive the mounted equipment, so that such problems can be avoided.

[0068] In this embodiment, the housing 26 is provided with a seat 56 for directly mounting the hydraulic pump 11. This makes it possible to directly mount the hydraulic pump 11 to the housing 26, eliminating the need for intermediate members (adapters, couplings, etc.) for indirectly mounting the hydraulic pump 11 to the housing 26, thereby reducing manufacturing costs.

[0069] Although the embodiments of the present disclosure have been described in detail above, various other embodiments and modifications of the present disclosure are possible.

[0070] (1) For example, in the above embodiment, the second output shaft 24 is configured to be coaxially connected to the input shaft 13 of the hydraulic pump 11. However, this is not limiting, and the second output shaft 24 may be configured to be connected to the input shaft 13 of the hydraulic pump 11 in an offset state.

[0071] FIG. 5 shows a simplified modification of this case. The center axis C4 of the second output shaft 24 and the center axis C5 of the input shaft 13 are offset, and gears 71 and 72 are provided on the outer peripheries of the second output shaft 24 and the input shaft 13. These gears 71 and 72 are meshed, and when the second output shaft 24 rotates, the input shaft 13 rotates. In the illustrated example, the input shaft 13 is disposed below the second output shaft 24, but this layout can be changed as desired. An idle gear (not shown) may be provided between the gears 71 and 72 to increase the offset amount. A power transmission mechanism other than a gear mechanism (such as a chain mechanism or a belt mechanism) may also be used.

[0072] For example, when the second output shaft 24 and the input shaft 13 cannot be arranged coaxially due to vehicle layout or other reasons, such an offset arrangement is effective.

[0073] (2) In the above embodiment, an electromagnetic solenoid is used as the actuator 63, but other actuators (such as an electric motor) can also be used. Furthermore, the sleeve drive member 62 can be operated automatically by the actuator 63 or manually.

[0074] The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents encompassed within the spirit of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the spirit of the present disclosure. [Explanation of symbols]

[0075] V vehicle 100 Motor drive device 11 Hydraulic pump 13 Input shaft 21 Motor 22 First output shaft 23 Power transmission mechanism 24 Second output shaft 25 Switching mechanism 26 Housing 44 First Spline 49 Second Spline 56 Seat 61 Sleeve 62 Sleeve drive member 63 Actuator

Claims

1. A motor drive device for outputting motor drive force for a hybrid vehicle, comprising: A motor; a first output shaft configured to be connected to a PTO shaft for extracting engine driving force of the hybrid vehicle; a power transmission mechanism that connects the motor and the first output shaft; a second output shaft configured to be connected to a drive source of an attached object mounted on the hybrid vehicle; a switching mechanism configured to selectively connect the first output shaft to the second output shaft; Equipped with the first output shaft and the second output shaft are coaxially arranged, The switching mechanism is a first spline provided on an outer periphery of the first output shaft; a second spline provided on an outer periphery of the second output shaft; a sleeve movable between a second position in which it meshes with only the second spline and a first position in which it meshes with both the first spline and the second spline; a sleeve driving member that drives the sleeve; Equipped with A motor drive device characterized by:

2. The switching mechanism includes an actuator that drives the sleeve drive member. The motor drive device according to claim 1 .

3. The second output shaft is configured to be coaxially connected to the input shaft of the drive source. The motor drive device according to claim 1 .

4. The second output shaft is configured to be directly connected to the input shaft of the drive source. The motor drive device according to claim 1 .

5. The second output shaft is configured to be connected to the input shaft of the drive source in an offset state. The motor drive device according to claim 1 .

6. a housing that accommodates the motor, the first output shaft, the power transmission mechanism, the second output shaft, and the switching mechanism; The motor drive device according to claim 1 .

7. The housing has a seat for directly mounting the drive source. The motor drive device according to claim 6.

8. The drive source is a hydraulic pump The motor drive device according to claim 1 .

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