JP2006264520A - Driving device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device of coaxial type capable of reducing the manufacturing cost by simplifying the structure. <P>SOLUTION: The driving device 1 to run a vehicle is equipped with a motor 3, a deceleration device 4 to decelerate the rotation fed from the driving shaft 33 of the motor 3, a differential device 5 to emit the rotation fed from the deceleration device 4 to two lines, a first 61 and a second axle shaft 62 extending coaxially from the differential device 5 to the driving shaft 33, a pair of driving wheels 8 coupled with the ends of the two axle shafts 61 and 62, a housing 2 accommodating the motor 3, deceleration device 4, and the differential device 5, and a plurality of coupling bolts 24 installed at the housing 2 not able to make relative rotation and penetrating at least either of the motor 3 and deceleration device 4 in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device in which the respective axes are coaxially arranged.

  2. Description of the Related Art As a drive device for an industrial vehicle such as a forklift, an apparatus using an electric motor as a power source is known. The drive device includes, for example, an electric motor, a speed reducer, a differential device, a pair of differential output shafts, a pair of drive wheels, and a housing that accommodates them. In this drive device, the rotation of the drive shaft of the electric motor is decelerated by a reduction device, and the reduced rotation is output to a pair of differential output shafts by a differential device, and each drive wheel connected to the differential output shaft. Rotation can be transmitted to

  In this drive device, an electric motor and a speed reducer are often arranged on the side of the differential output shaft in the axial direction, and it is difficult to reduce the size. For this reason, a coaxial type driving device has been proposed in which each shaft is coaxially arranged to reduce the size (see, for example, Patent Document 1).

In this coaxial type drive device, the speed reducer or the like is constituted by a planetary gear mechanism, and the drive shaft of the electric motor is a cylindrical member, and one differential output shaft passes through the inside of the drive shaft. Yes. Therefore, the electric motor, the reduction gear, the differential device, and the differential output shaft can be arranged on the same axis, and the size can be reduced as compared with the case where the type is not coaxial.
Japanese Patent Laid-Open No. 2001-121981

  In the coaxial drive device described above, since the reaction force of the driving force acts on the electric motor and the speed reducer, it is necessary to fix the electric motor and the speed reducer so that they cannot rotate relative to the housing. Specifically, it is necessary to form a spline portion on the inner peripheral side of the housing and the outer peripheral side of the electric motor or the speed reducer, and press-fit in a state where the spline portions are engaged with each other. However, if spline parts are formed in each part, the structure becomes complicated and the manufacturing cost tends to increase.

  Further, when the electric motor and the speed reducer are fixed to the housing, a reaction force from the electric motor or the like is transmitted to the housing. However, since the housing is divided in the axial direction in consideration of maintenance or the like, there is a possibility that a reaction force acts on the divided portion to cause damage or the like.

  An object of the present invention is to simplify the structure and reduce the manufacturing cost in a coaxial drive device.

  Another object of the present invention is to improve the strength of a divided housing in a coaxial drive device.

  The drive device according to claim 1 is for driving a vehicle, and includes an electric motor, a reduction device for reducing rotation input from a drive shaft of the electric motor, and rotation input from the reduction device. A differential device for outputting to two systems, a pair of differential output shafts extending coaxially with respect to the drive shaft from the differential device, and a pair of drive wheels connected to the end of the differential output shaft And a housing that houses the electric motor, the reduction gear, and the differential device, and a plurality of connecting members that are provided in the housing so as not to be relatively rotatable and penetrate at least one of the electric motor and the reduction gear in the axial direction.

  Since this drive device includes a plurality of connecting members penetrating the electric motor and the speed reducer, the electric motor, the speed reducer, and the housing can be connected so as not to be relatively rotatable. As a result, there is no need to provide a spline portion for fixing the electric motor and the speed reducer in the housing as in the conventional case. Thereby, the structure can be simplified and the manufacturing cost can be reduced.

  A drive device according to a second aspect is the drive device according to the first aspect, wherein the housing includes a cylindrical first housing, and second and third housings that are detachably provided at both axial ends of the first housing. ing. The first, second and third housings are connected in the axial direction by a connecting member.

  In this drive device, since the first, second, and third housings are connected in the axial direction by the plurality of connecting members, the first, second, and third housings can be formed as an integral rigid body. Thereby, the intensity | strength of the housing divided | segmented compared with the past can be improved.

  According to a third aspect of the present invention, there is provided a drive device for driving a vehicle, wherein the motor, a reduction device for reducing the rotation input from the drive shaft of the electric motor, and the rotation input from the reduction device. A differential device for outputting to two systems, a pair of differential output shafts extending coaxially with respect to the drive shaft from the differential device, and a pair of drive wheels connected to the end of the differential output shaft And a housing that houses the electric motor, the reduction gear, and the differential device, and a plurality of connecting members that are provided in the housing so as not to rotate relative to each other. The housing includes a cylindrical first housing and second and third housings that are detachably provided at both axial ends of the first housing. The first, second and third housings are connected in the axial direction by a connecting member.

  In this drive device, since the first, second and third housings are connected in the axial direction by a plurality of connecting members, the first, second and third housings can be integrated into a rigid body. In comparison, the strength of the divided housing can be improved.

A drive device according to a fourth aspect is the drive device according to the second or third aspect, wherein the speed reducer is inserted into the first and second housings.
In this drive device, since the speed reducer is inserted into the first and second housings, the first and second housings can be easily centered using the speed reducer.

According to a fifth aspect of the present invention, in the drive device according to any one of the second to fourth aspects, the third housing has a cylindrical portion that is fitted into the first housing.
In this drive device, the second and third housings can be easily centered.

According to a sixth aspect of the present invention, there is provided the drive device according to any one of the first to fifth aspects, wherein the reduction gear is provided at the end of the drive shaft, and a plurality of planetary gears that are disposed on the outer peripheral side of the sun gear and mesh with the sun gear. And an annular ring gear arranged on the outer peripheral side of the planetary gear and meshing with the planetary gear. The connecting member penetrates the ring gear in the axial direction.
In this drive device, the reaction force acting on the ring gear can be received by the housing via the connecting member.

The drive device according to claim 7 is the drive device according to any one of claims 1 to 6, wherein the electric motor is disposed on the outer peripheral side of the rotor, the rotor being fixed to the outer peripheral side of the drive shaft, the drive shaft, And a stator that is inserted into the. The connecting member penetrates the stator in the axial direction.
In this drive device, the reaction force acting on the stator can be received by the housing via the connecting member.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the fixing member is screwed into at least one end of the connecting member.
In this drive device, since the connecting member can be easily attached and detached, the first, second, and third housings can be easily disassembled and assembled. Thereby, the maintainability of a drive device can be improved.

  A drive device according to a ninth aspect is for driving a vehicle, and includes an electric motor, a reduction device for reducing rotation input from a drive shaft of the electric motor, and rotation input from the reduction device. A differential device for outputting to two systems, a pair of differential output shafts extending coaxially with respect to the drive shaft from the differential device, and a pair of drive wheels connected to the end of the differential output shaft A housing that houses the electric motor, the speed reducer, and the differential, a plurality of first connecting members that are provided in the housing so as not to rotate relative to each other in the axial direction, and that are provided in the housing so as not to rotate relative to each other. And a plurality of second connecting members penetrating the apparatus in the axial direction.

  Since this drive device includes a plurality of first and second connecting members that penetrate the electric motor and the speed reducer, the electric motor and the speed reducer can be connected to the housing in a relatively non-rotatable manner. Thereby, it is not necessary to provide a spline portion for fixing the electric motor and the speed reducer in the housing as in the conventional case, the structure can be simplified, and the manufacturing cost can be reduced.

  According to a tenth aspect of the present invention, in the drive device according to the ninth aspect, the housing includes a cylindrical first housing, second and third housings that are detachably provided at both axial ends of the first housing, and a first housing. And an intermediate member provided between the second housing and inserted into the first and second housings. The third housing and the intermediate member are connected in the axial direction by the first connecting member. The second housing and the intermediate member are connected in the axial direction by the second connecting member.

  In this drive device, since the second and third housings and the intermediate member are connected in the axial direction by the plurality of first and second connecting members, the first, second and third housings and the intermediate member are integrated. Can be a rigid body. Thereby, the intensity | strength of the housing divided | segmented compared with the past can be improved.

  A drive device according to an eleventh aspect is for driving a vehicle, and includes an electric motor, a reduction device for reducing rotation input from a drive shaft of the electric motor, and rotation input from the reduction device. A differential device for outputting to two systems, a pair of differential output shafts extending coaxially with respect to the drive shaft from the differential device, and a pair of drive wheels connected to the end of the differential output shaft A housing that houses the electric motor, the speed reducer, and the differential, a plurality of first connecting members that are provided in the housing so as not to rotate relative to each other in the axial direction, and that are provided in the housing so as not to rotate relative to each other. And a plurality of second connecting members penetrating the apparatus in the axial direction. The housing includes a cylindrical first housing, second and third housings detachably provided at both axial ends of the first housing, and the first and second housings provided between the first and second housings. And an intermediate member to be inserted into the inside. The third housing and the intermediate member are connected in the axial direction by the first connecting member. The second housing and the intermediate member are connected in the axial direction by the second connecting member.

  In this drive device, since the second and third housings and the intermediate member are connected in the axial direction by the plurality of first and second connecting members, the first, second and third housings and the intermediate member are integrated. Can be a rigid body. Thereby, the intensity | strength of the housing divided | segmented compared with the past can be improved.

A drive device according to a twelfth aspect of the present invention is the drive device according to the twelfth or eleventh aspect, wherein the intermediate member has a disk-shaped intermediate member main body, and extends from the outer peripheral side of the intermediate member main body to both axial sides. It has cylindrical first and second intermediate cylindrical portions to be inserted and an annular portion extending radially outward from the outer peripheral side of the intermediate member main body and sandwiched between the first and second housings. .
In this drive device, since the intermediate member has the above-described configuration, the first and second housings can be easily centered.

A drive device according to a thirteenth aspect is the drive device according to any one of the ninth to twelfth aspects, wherein the speed reducer is disposed on the outer end side of the first sun gear and is engaged with the sun gear. It has a planetary gear and an annular ring gear arranged on the outer peripheral side of the planetary gear and meshing with the planetary gear. The first and second connecting members penetrate the ring gear in the axial direction.
In this drive device, the reaction force acting on the first ring gear can be received by the housing via the connecting member.

A drive device according to a fourteenth aspect of the present invention is the drive device according to any one of the ninth to thirteenth aspects, wherein the electric motor is disposed on the outer peripheral side of the rotor, the rotor being fixed to the outer peripheral side of the drive shaft, the drive shaft And a stator that is inserted into the. The first and second connecting members penetrate the stator in the axial direction.
In this drive device, the reaction force acting on the stator can be received by the housing via the connecting member.

In the drive device according to the present invention, by providing the connecting member, the structure can be simplified, and the manufacturing cost can be reduced.
In the drive device according to the present invention, the strength of the divided housing can be increased by providing the connecting member.

  An embodiment of the present invention will be described with reference to the drawings.

A. First embodiment
1. Schematic cross-sectional view of the driving device 1 of the first embodiment of the present invention in overall block diagram 1 of a drive device, showing a schematic cross-sectional view of the inner housing 2 of the drive device 1 of the first embodiment of the present invention in FIG. 2 . As shown in FIG. 1, the drive device 1 mainly includes a housing 2, an electric motor 3, a speed reducer 4, a differential device 5, a pair of axles 6, a pair of brake devices 7, 1 A pair of drive wheels 8 is included.

(1) Housing The housing 2 is for housing the electric motor 3, the speed reduction device 4, and the differential device 5 therein. The housing 2 is divided into a plurality of members and can be disassembled as will be described later. Details of the housing 2 will be described later.

(2) Electric motor The electric motor 3 is a power source of the drive device 1 and is disposed inside the housing 2. As shown in FIG. 2, the electric motor 3 includes a stator 31, a rotor 32, and a drive shaft 33.

  The stator 31 is a cylindrical member provided on the outer peripheral side, and is fixed to the housing 2. A cylindrical rotor 32 and a drive shaft 33 are disposed on the inner peripheral side of the stator 31 so as to be relatively rotatable. The rotor 32 is fixed to the outer peripheral side of the drive shaft 33. The drive shaft 33 is a cylindrical member extending in the axial direction, and both ends of the drive shaft 33 are supported by the first and second bearings 33b and 33c so as to be relatively rotatable with respect to the housing 2. A disc-shaped motor cover 35 that constitutes a part of the housing 2 is provided on the speed reducer 4 side of the electric motor 3. The motor cover 35 is fixed to the second housing 22 together with a first ring gear 45 of the reduction gear 4 described later. The above-described second bearing 33 c is disposed on the inner peripheral side of the motor cover 35. The space on the speed reducer 4 side of the motor cover 35 is filled with hydraulic oil, and the spaces on both axial sides of the motor cover 35 are sealed by the motor cover 35 and the seal member 34. Examples of the electric motor 3 include a DC motor, an AC motor, an SR motor (Switched Reluctance Motor), and the like.

(3) Deceleration Device The deceleration device 4 is for decelerating the rotation input from the electric motor 3, and is connected to the drive shaft 33 of the electric motor 3. FIG. 3 shows a schematic cross-sectional view around the reduction gear 4 and the differential 5. As shown in FIG. 3, the speed reduction device 4 includes a first speed reduction device 40 and a second speed reduction device 44.

  The first reduction gear 40 is for reducing the rotation of the drive shaft 33 of the electric motor 3, and includes a first sun gear (sun gear) 33a, a plurality of first planetary gears 41 (planetary gears), and a first ring gear 45 (ring gear). And a planetary gear mechanism composed of a first carrier 42 and a second carrier 49.

  The first sun gear 33 a is fixed to the outer peripheral side of the end portion of the drive shaft 33. A plurality of first planetary gears 41 that mesh with the first sun gear 33a are disposed on the outer peripheral side of the first sun gear 33a. An annular first ring gear 45 that meshes with each first planetary gear 41 is disposed on the outer peripheral side of each first planetary gear 41. The first ring gear 45 is fixed to the housing 2 by the first bolt 22c together with the motor cover 35 (FIG. 2). The first carrier 42 is an annular member for connecting a plurality of first pins 41 a provided in the first planetary gear 41 in the circumferential direction. A cylindrical second sun gear 43 extending in the axial direction is fixed to the inner peripheral side of the first carrier 42. A second carrier 49 is arranged on the opposite side of the first planetary gear 41 from the first carrier 42. The second carrier 49 connects the first pin 41 a together with the first carrier 42 in the circumferential direction. The second carrier 49 is supported by the third bearing 49 a so as to be rotatable relative to the motor cover 35.

  The second reduction device 44 is for further reducing the rotation input from the first reduction device 40, and is a planet composed of a plurality of second planetary gears 46, a third carrier 47, and a first ring gear 45. It is a gear mechanism.

  A plurality of second planetary gears 46 that mesh with the second sun gear 43 are arranged on the outer peripheral side of the second sun gear 43 described above. Each second planetary gear 46 also meshes with the first ring gear 45. The third carrier 47 is an annular member for connecting a plurality of second pins 46 a provided in the second planetary gear 46 in the circumferential direction.

  With the above configuration, the rotation of the drive shaft 33 of the electric motor 3 is decelerated in two stages, output to the third carrier 47 and transmitted to the differential device 5.

(4) Differential Device The differential device 5 is for outputting the rotation input from the speed reducer 4 to two systems and transmitting it to the pair of drive wheels 8 via the axle 6, as shown in FIG. As described above, the planetary gear mechanism includes the third ring gear 54, the plurality of third planetary gears 53, the third carrier 51, the third sun gear 52, and the fifth carrier 56.

  The third ring gear 54 is a cylindrical member fixed to the outer peripheral side of the third carrier 47 of the second reduction gear 44. A plurality of third planetary gears 53 that mesh with the third ring gear 54 are arranged on the inner peripheral side of the third ring gear 54. The third carrier 51 is an annular member for connecting a plurality of third pins 53 a provided in the third planetary gear 53 in the circumferential direction, and is connected to the third carrier 47 by the third bearing 51 a. It is supported for relative rotation.

  A third sun gear 52 that meshes with each third planetary gear 53 is disposed on the inner peripheral side of each third planetary gear 53. The third sun gear 52 is fixed to an end portion of a second axle shaft 62 described later. A fifth carrier 56 is disposed on the opposite side of the third planetary gear 53 from the third carrier 51. The fifth carrier 56 connects the plurality of third pins 53 a together with the third carrier 51 in the circumferential direction. The fifth carrier 56 is fixed to an end portion of a first axle shaft 61 described later, and is supported by two fourth bearings 56a so as to be relatively rotatable with respect to a first support member 64 of the axle 6 described later. .

  With the above configuration, the rotation output from the reduction gear 4 is transmitted to each drive wheel 8 while adjusting the difference in rotation between the left and right drive wheels 8.

(5) Axle The axle 6 is for transmitting the rotation output from the differential 5 to the pair of drive wheels 8, and as shown in FIG. 1, the second axle shaft 62 and the first axle shaft are provided. 61, a second support member 65, and a first support member 64.

  The first and second axle shafts 61 and 62 are disposed coaxially and extend from the differential 5 to the left and right. The first axle shaft 61 is supported so as to be rotatable relative to the housing 2 by a first support member 64 fixed to the second housing 22 and a bearing (not shown). The second axle shaft 62 penetrates the inside of the drive shaft 33 and is supported by the second support member 65 and a bearing (not shown) so as to be relatively rotatable with respect to the housing 2. A pair of drive wheels 8 are connected to the ends of the first and second axle shafts 61 and 62.

(6) Brake Device The brake device 7 is for braking the rotation of the drive wheel 8, and is disposed on the outer peripheral side of the axle 6 as shown in FIG. Examples of the brake device 7 include a drum brake and a wet brake using hydraulic pressure. In this embodiment, the brake device 7 is described as a drum brake. Since the configuration of the brake device 7 is not different from that of a conventional drum brake, detailed description thereof is omitted.

2. Structure around the housing The drive device 1 according to the present invention is characterized by the structure around the housing 2. Specifically, as shown in FIG. 2, the housing 2 includes a first housing 21, a second housing 22, and a third housing 23.

  The first housing 21 is a cylindrical member extending in the axial direction, and the electric motor 3 and the speed reducer 4 are disposed on the inner peripheral side thereof. A pair of second and third housings 22 and 23 are detachably disposed at both axial ends of the first housing 21.

  The second housing 22 has a second disc portion 22a and a second cylindrical portion 22b. The second disk portion 22a is a disk-shaped portion formed on the first housing 21 side. The second cylindrical portion 22b is a cylindrical portion extending in the axial direction from the second disc portion 22a, and is in contact with the first housing 21 in the axial direction. The first ring gear 45 and the motor cover 35 are fixed to the second disc portion 22a by the first bolts 22c. The first ring gear 45 is inserted into the first housing 21 and the inner peripheral side of the second cylindrical portion 22b without a gap. With these configurations, the relative positions in the axial direction and the radial direction of the first and second housings 21 and 22 are determined, and the first and second housings 21 and 22 can be easily centered. The first and second housings 21 and 22 can support the first ring gear 45 in the axial direction and the radial direction.

  The 3rd housing 23 has the 3rd disk part 23a and the 3rd cylindrical part 23b. The third disc portion 23a is a disc-shaped portion formed on the first housing 21 side. The third cylindrical portion 23b is a cylindrical portion that extends in the axial direction from the third disc portion 23a. The 1st housing 21 is inserted by the outer peripheral part of the 3rd cylindrical part 23b, and is contact | abutting in the axial direction with the outer peripheral part of the 3rd disc part 23a. Further, the stator 31 of the above-described electric motor 3 is inserted into the first housing 21, and the stator 31 is fixed to the third cylindrical portion 23b by a plurality of first bolts 23c. With these configurations, the relative positions in the axial direction and the radial direction of the first and third housings 21 and 23 are determined, and the first and third housings 21 and 23 can be easily centered. The first and third housings 21 and 23 can support the stator 31 in the axial direction and the radial direction.

  In order to connect the first, second, and third housings 21, 22, and 23 described above in the axial direction, the drive device 1 further includes a plurality of long connection bolts 24. Specifically, the connecting bolt 24 is an elongated rod-like member extending between the second housing 22 and the third housing 23, and a pair of nuts 25 are screwed to both ends. The connecting bolt 24 passes through the second and third housings 22 and 23 (more specifically, the second and third disk portions 22a and 23a) in the axial direction, and is circumferential so that the connection state is uniform. Evenly arranged in the direction. In this embodiment, the number of connecting bolts 24 is twelve. The holes 22e and 23e into which the connecting bolt 24 is fitted are set to dimensions that do not cause a gap between the connecting bolt 24 and the holes 22e and 23e. The second and third housings 22 and 23 are tightened in the axial direction by connecting bolts 24 and nuts 25.

  With the above configuration, the first, second, and third housings 21, 22, and 23 can be integrated into a rigid body by the plurality of connecting bolts 24. Therefore, the strength of the housing 2 can be improved as compared with the conventional case. . Further, since the connecting bolt 24 is fitted in the holes 22e and 23e with almost no gap, the second and third housings 22 and 23 are not rattled in the circumferential direction, and the connecting strength between the two housings 22 and 23 is increased. Can be improved.

  Further, the connecting bolt 24 passes through the stator 31 and the first ring gear 45 in the axial direction, and the stator 31 and the first ring gear 45 are connected to the housing 2 so as not to be relatively rotatable. As a result, the reaction force in the rotational direction acting on the stator 31 and the first ring gear 45 can be received by the housing 2 via the connecting bolt 24. Thereby, it is not necessary to provide a spline portion for fixing the stator and the ring gear in the housing as in the conventional case, and the structure can be simplified. That is, the manufacturing cost can be reduced.

  In addition, the holes 31e and 45e into which the connecting bolt 24 is fitted are set to dimensions that do not cause a gap between the connecting bolt 24 and the holes 31e and 45e. As a result, the backlash in the rotational direction between the housing 2 and the stator 31 and the first ring gear 45 can be reduced. Therefore, the rotational reaction force acting on the stator 31 and the first ring gear 45 is caused by the housing 2 via the connecting bolt 24. I can receive it reliably. That is, the connection strength of the housing 2, the stator 31, and the first ring gear 45 can be improved.

3. Work procedure during maintenance Since the drive device 1 includes the connecting bolt 24, disassembly and assembly work during maintenance can be easily performed. Hereinafter, a disassembling work procedure at the time of maintenance of the drive device 1 will be described. 4 and 5 show exploded state diagrams of the driving device 1. As shown in FIG. 4, when the nut 25 and the first bolt 22 c of the connecting bolt 24 are first removed, the second housing 22, the axle 6, the brake device 7, and the drive wheel 8 can be integrally removed in the axial direction. In this state, maintenance around the reduction gear 4 and the differential 5 can be performed.

  Next, as shown in FIG. 5, when the third sun gear 52 of the differential 5 is removed from the second axle shaft 62, the differential 5, the speed reducer 4, and the motor cover 35 can be removed in the axial direction. Although FIG. 5 shows a state where the speed reduction device 4 and the differential device 5 are integrally removed, they may be removed for each constituent member. In this state, maintenance around the motor 3 can be performed. As shown in FIG. 5, when the first bolt 23c is removed, the electric motor 3 can be removed in the axial direction. Thus, the internal maintenance can be facilitated in this drive device 1.

  Further, in the assembly work, the stator 31 and the first ring gear 45 can be easily centered by the connecting bolt 24. Further, as shown in FIG. 4, the second housing 22 is inserted into the connecting bolt 24 and the second cylindrical portion 22 b of the second housing 22 is inserted into the first ring gear 45. The housings 21 and 22 can be easily centered. Note that the assembly work of the drive device 1 may be performed in the reverse order of the above-described disassembly work, and thus detailed description thereof is omitted.

5. Operational Effects The operational effects of the drive device 1 according to the present invention are summarized below.
Since the drive device 1 includes the plurality of connection bolts 24, the stator 31 of the electric motor 3 and the first ring gear 45 of the speed reduction device 4 can be connected to the housing in a relatively non-rotatable manner. Accordingly, it is not necessary to provide a spline portion for fixing the stator and the ring gear in the housing as in the conventional case, and the structure can be simplified. That is, the manufacturing cost can be reduced.

  Moreover, in this drive device 1, since the first, second and third housings 21, 22, 23 are connected in the axial direction by the plurality of connecting bolts 24, the first, second and third housings 21, 22, 23 can be formed as an integral rigid body, and the strength of the housing 2 can be improved as compared with the conventional case. Moreover, since the 2nd and 3rd housings 22 and 23 can be easily removed by removing the connection volt | bolt 24, maintainability can be improved.

  Further, in this drive device 1, since the holes 31 e and 45 e into which the connecting bolt 24 is fitted are set to dimensions that do not cause a gap between the connecting bolt 24 and the housing 2, the stator 31, and the first The play in the rotation direction with the one ring gear 45 can be reduced. As a result, the rotational reaction force acting on the stator 31 and the first ring gear 45 can be reliably received by the housing 2 via the connecting bolt 24. That is, the connection strength of the housing 2, the stator 31, and the first ring gear 45 can be improved.

  Furthermore, in this drive device 1, since the first ring gear 45 of the reduction gear 4 is inserted into the first and second housings 21 and 22, the first and second housings 21, 22 can be easily centered. Moreover, in this drive device 1, since the 3rd housing 23 has the 3rd cylindrical part 23b, the 2nd and 3rd housings 22 and 23 can be centered easily.

B. Second Embodiment In the first embodiment described above, the second and third housings 22 and 23 are connected by the connecting bolt 24, but the following embodiments are also conceivable.

1. Schematic cross-sectional view of the driving device 101 of the second embodiment of the present invention in overall block diagram 6 of the driving device, shows a cross-sectional schematic view of the inner housing 102 of the driving device 101 of the second embodiment of the present invention in FIG. 7 . As shown in FIG. 6, the basic configuration of the drive device 101 is the same as that of the drive device 1 of the first embodiment, but the configuration of the housing 102 is slightly different.

  Specifically, as shown in FIG. 7, the housing 102 in the present embodiment includes a first housing 121, a second housing 122, a third housing 123, and an intermediate plate 135 (intermediate member). . Since the basic configuration of the first, second, and third housings 121, 122, and 123 is the same as that of the first embodiment described above, detailed description thereof is omitted.

  The intermediate plate 135 is a member corresponding to the motor cover 35 of the first embodiment described above, and constitutes a part of the housing 102. The intermediate plate 135 is disposed between the first and second housings 121 and 122, and includes an intermediate plate body 135a, a first intermediate cylindrical portion 135c, a second intermediate cylindrical portion 135b, and an annular portion 135d. have. The intermediate plate main body 135 a is a disk-shaped part that constitutes a main part of the intermediate plate 135. The first and second intermediate cylindrical portions 135b and 135c are cylindrical portions extending from the outer peripheral side of the intermediate plate body 135a to both sides in the axial direction, and are inserted into the first and second housings 121 and 122, respectively. ing. The annular portion 135d is a portion that extends further outward in the radial direction from the outer peripheral side of the intermediate plate body 135a, and is sandwiched between the first housing 121 and the second cylindrical portion 122b of the second housing 122. .

  The second housing 122 is fixed to the first intermediate cylindrical portion 135c of the intermediate plate 135 by a plurality of first connection bolts 124a. Specifically, the first connecting bolt 124a is an elongated rod-like member extending between the second housing 122 and the intermediate plate 135, and the second housing 122 (more specifically, the second disc portion 122a) is pivoted. One end portion is screwed into the first intermediate cylindrical portion 135c in a state of penetrating in the direction. A head portion 125a having an outer diameter larger than that of the first connection bolt 124a is provided at the other end of the first connection bolt 124a. The intermediate plate 135 and the second housing 122 are tightened in the axial direction by the first connecting bolt 124a and the head 125a. In the present embodiment, the head 125a is fixed to the first connecting bolt 124a, but may be screwed to the first connecting bolt 124a. Further, the first connecting bolt 124 a penetrates the second housing 122 and penetrates the first ring gear 145 of the reduction gear 104 in the axial direction. The holes 122e and 145e into which the first connection bolts 124a are fitted are set to dimensions that do not cause a gap between the first connection bolts 124a. The first ring gear 145 is fixed to the intermediate plate 135 by a plurality of first bolts 122c. The first connection bolts 124a and the first bolts 122c are equally arranged in the circumferential direction so that the connection state is uniform.

  The third housing 123 is fixed to the second intermediate cylindrical portion 135b of the intermediate plate 135 by a plurality of second connecting bolts 124b with the first housing 121 sandwiched between the annular portion 135d. Specifically, it is an elongated rod-like member extending between the third housing 123 and the intermediate plate 135, and is one end in a state of passing through the third housing 123 (more specifically, the third disc portion 123a) in the axial direction. The portion is screwed into the first intermediate cylindrical portion 135c. A head 125b having a larger outer diameter than the second connection bolt 124b is provided at the other end of the second connection bolt 124b. The intermediate plate 135 and the third housing 123 are tightened in the axial direction by the second connecting bolt 124b and the head 125b. In the present embodiment, the head 125b is fixed to the second connecting bolt 124b, but may be screwed to the second connecting bolt 124b. The second connecting bolt 124 b penetrates the third housing 123 and penetrates the stator 131 of the electric motor 103 in the axial direction. The holes 123e and 131e into which the second connection bolt 124b is fitted are set to dimensions that do not cause a gap between the second connection bolt 124b. The stator 131 is fixed to the intermediate plate 135 by a plurality of second bolts 123c. The second connection bolts 124b and the second bolts 123c are equally arranged in the circumferential direction so that the connection state is uniform.

  With the above configuration, the first, second, and third housings 121, 122, and 123 and the intermediate plate 135 can be integrated into a rigid body, so that the strength of the housing 102 can be improved as compared with the conventional case. Similarly to the first embodiment, the first and second connection bolts 124a and 124b are fitted in the holes 122e and 123e with almost no gap, so that the second and third housings 122 and 123 are arranged in the circumferential direction. The connection strength between the housings 122 and 123 can be improved without rattling.

  The first and second connection bolts 124 a and 124 b penetrate the stator 131 and the first ring gear 145 in the axial direction, and the stator 131 and the first ring gear 145 are connected to the housing 102 so as not to rotate relative to each other. . As a result, the reaction force in the rotational direction acting on the stator 131 and the first ring gear 145 can be received by the housing 102 and the intermediate plate 135 via the first and second connection bolts 124a and 124b. Thereby, it is not necessary to provide a spline portion for fixing the stator and the ring gear in the housing as in the conventional case, and the structure can be simplified. That is, the manufacturing cost can be reduced.

  In addition, the holes 131e and 145e into which the first and second connection bolts 124a and 124b are fitted are set to dimensions that do not substantially cause gaps between the first and second connection bolts 124a and 124b, respectively. ing. As a result, the backlash in the rotational direction between the housing 102 and the stator 131 and the first ring gear 145 can be reduced. Therefore, the reaction force in the rotational direction acting on the stator 131 and the first ring gear 145 can be reduced by the first and second couplings. It can be reliably received by the housing 102 and the intermediate plate 135 via the bolts 124a and 124b. That is, the connection strength of the housing 102, the stator 131, and the first ring gear 145 can be improved.

3. Work Procedure at Maintenance The disassembly work procedure at the time of maintenance of the drive device 101 described above will be described. 8 and 9 show exploded state diagrams of the drive device 101. FIG. As shown in FIG. 8, when the first connecting bolt 124a is first removed, the second housing 122, the axle 106, the brake device 107, and the drive wheel 108 can be integrally removed in the axial direction. In this case, since only the first connecting bolt 124a is removed, this operation can be facilitated. In this state, maintenance around the reduction gear 104 and the differential 105 can be performed.

  Next, as shown in FIG. 9, when the second connecting bolt 124b is removed and the third sun gear 152 of the differential 105 is removed from the first axle shaft 161, the speed reducer 104, the differential 105, the intermediate plate 135, and The electric motor 103 can be integrally removed in the axial direction. Further, when the first bolt 122c is removed, the reduction gear 104 and the differential device 105 can be removed from the intermediate plate 135, and when the second bolt 123c is removed, the electric motor 103 can be removed from the intermediate plate 135. Through the above operations, the reduction gear 104, the differential gear 105, and the electric motor 103 can be maintained. In this way, the internal maintenance can be facilitated in this drive device 101.

  Further, during the assembly work, the stator 31 and the first ring gear 45 can be easily centered by the first and second connecting bolts 124a and 124b. Further, as shown in FIG. 8, the second cylindrical portion 122b and the first housing 121 of the second housing 122 are inserted into the first and second intermediate cylindrical portions 135c and 135b. The housings 121 and 122 can be easily centered. Note that the assembly operation of the drive device 101 may be performed in the reverse order of the above-described disassembly operation, and thus detailed description thereof is omitted.

5. Operational Effects The operational effects of the drive device 101 according to the present invention are summarized below.
Since the drive device 101 includes a plurality of first and second connection bolts 124a and 124b, the stator 131 of the electric motor 103 and the first ring gear 145 of the speed reduction device 104 are connected to the housing in a relatively non-rotatable manner. Can do. Accordingly, it is not necessary to provide a spline portion for fixing the stator and the ring gear in the housing as in the conventional case, the structure can be simplified, and the manufacturing cost can be reduced.

  In the driving device 1, the first, second, and third housings 121, 122, 123 and the intermediate plate 135 are connected in the axial direction by the plurality of first and second connecting bolts 124a, 124b. The first, second, and third housings 121, 122, and 123 and the intermediate plate 135 can be formed as an integral rigid body, and the strength of the housing 102 can be improved as compared with the conventional case. Further, since the second and third housings 122 and 123 can be easily removed by removing the first and second connecting bolts 124a and 124b, the maintainability can be improved.

  Further, in this drive device 1, the holes 131e and 145e into which the first and second connection bolts 124a and 124b are fitted do not substantially cause gaps between the first and second connection bolts 124a and 124b, respectively. The dimensions are set. As a result, the backlash in the rotational direction between the housing 102 and the stator 131 and the first ring gear 145 can be reduced. Therefore, the reaction force in the rotational direction acting on the stator 131 and the first ring gear 145 can be reduced by the first and second couplings. It can be reliably received by the housing 102 and the intermediate plate 135 via the bolts 124a and 124b. That is, the connection strength of the housing 102, the stator 131, and the first ring gear 145 can be improved.

  Furthermore, since the drive device 101 has the first and second intermediate cylindrical portions 135b and 135c of the intermediate plate 135, the first and second housings can be easily centered. Further, in the driving device 101, since the third housing 123 has the third cylindrical portion 123b, the second and third housings 122 and 123 can be easily centered.

C. Other Embodiments The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

(1) Electric motor The first and second embodiments described above do not limit the type of electric motor.

(2) Connection Bolt In the first embodiment described above, the pair of nuts 25 are screwed to both ends of the connection bolt 24, but one nut 25 may be fixed to the connection bolt 24.

(3) Brake device In the first and second embodiments described above, the brake device is described as a drum brake, but the present invention is not limited to this. Wet brakes or other types may be used.

1 is a schematic cross-sectional view of a drive device 1 as a first embodiment of the present invention. The cross-sectional schematic inside the housing 2 of the drive device 1 as 1st Embodiment of this invention. FIG. 3 is a schematic cross-sectional view of the speed reducer 4 and the differential device 5. The disassembled state figure of the drive device 1 as 1st Embodiment of this invention. The disassembled state figure of the drive device 1 as 1st Embodiment of this invention. Sectional schematic of the drive device 101 as 2nd Embodiment of this invention. The cross-sectional schematic inside the housing 102 of the drive device 101 as 2nd Embodiment of this invention. The disassembled state figure of the drive device 101 as 2nd Embodiment of this invention. The disassembled state figure of the drive device 101 as 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive device 2 Housing 3 Electric motor 4 Deceleration device 5 Differential device 6 Axle 7 Brake device 8 Drive wheel 21, 121 1st housing 22, 122 2nd housing 23, 123 3rd housing 24 Connection bolt (connection member)
24a Nut (fixing member)
33a First sun gear (sun gear)
41 1st planetary gear (planetary gear)
45 1st ring gear (ring gear)
124a First connecting bolt (first connecting member)
124b Second connecting bolt (second connecting member)
135 Intermediate plate (intermediate member)
135a Intermediate plate body (intermediate member body)
135c 1st intermediate cylindrical part 135b 2nd intermediate cylindrical part 135d Annular part

Claims (14)

A drive device for running a vehicle,
An electric motor,
A reduction gear for reducing the rotation input from the drive shaft of the electric motor;
A differential for outputting the rotation input from the speed reducer to two systems;
A pair of differential output shafts extending coaxially from the differential device to the drive shaft;
A pair of drive wheels coupled to an end of the differential output shaft;
A housing that houses the electric motor, the reduction gear, and the differential;
A plurality of connecting members provided in the housing in a relatively non-rotatable manner and penetrating at least one of the electric motor and the speed reducer in the axial direction;
Drive device. The housing includes a cylindrical first housing, and second and third housings that are detachably provided at both axial ends of the first housing.
The first, second and third housings are connected in the axial direction by the connecting member,
The drive device according to claim 1. A drive device for running a vehicle,
An electric motor,
A reduction gear for reducing the rotation input from the drive shaft of the electric motor;
A differential for outputting the rotation input from the speed reducer to two systems;
A pair of differential output shafts extending coaxially from the differential device to the drive shaft;
A pair of drive wheels coupled to an end of the differential output shaft;
A housing that houses the electric motor, the reduction gear, and the differential;
A plurality of connecting members provided in the housing so as not to be relatively rotatable,
The housing includes a cylindrical first housing, and second and third housings that are detachably provided at both axial ends of the first housing.
The first, second and third housings are connected in the axial direction by the connecting member,
Drive device. The speed reducer is inserted into the first and second housings,
The drive device according to claim 2 or 3. The third housing has a cylindrical portion that is inserted into the first housing.
The drive device according to any one of claims 2 to 4. The speed reducer includes a sun gear provided at an end of the drive shaft, a plurality of planetary gears arranged on the outer peripheral side of the sun gear and meshing with the sun gear, and an annular shape arranged on the outer circumferential side of the planetary gear and meshed with the planetary gear Ring gear,
The connecting member penetrates the ring gear in the axial direction.
The drive device according to any one of claims 1 to 5. The electric motor includes the drive shaft, a rotor fixed to the outer peripheral side of the drive shaft, and a stator that is disposed on the outer peripheral side of the rotor and is inserted into the first housing,
The connecting member penetrates the stator in the axial direction,
The drive device according to any one of claims 1 to 6. A fixing member is screwed to at least one end of the connecting member.
The drive device according to any one of claims 1 to 7. A drive device for running a vehicle,
An electric motor,
A reduction gear for reducing the rotation input from the drive shaft of the electric motor;
A differential for outputting the rotation input from the speed reducer to two systems;
A pair of differential output shafts extending coaxially from the differential device to the drive shaft;
A pair of drive wheels coupled to an end of the differential output shaft;
A housing that houses the electric motor, the reduction gear, and the differential;
A plurality of first connecting members provided in the housing in a relatively non-rotatable manner and passing through the electric motor in the axial direction;
A plurality of second connecting members provided in the housing so as not to rotate relative to each other and penetrating the speed reducer in the axial direction;
Drive device. The housing is provided between a cylindrical first housing, second and third housings detachably provided at both axial ends of the first housing, and the first and second housings. An intermediate member inserted into the first and second housings,
The third housing and the intermediate member are connected in the axial direction by the first connecting member,
The second housing and the intermediate member are connected in the axial direction by the second connecting member,
The drive device according to claim 9. A drive device for running a vehicle,
An electric motor,
A reduction gear for reducing the rotation input from the drive shaft of the electric motor;
A differential for outputting the rotation input from the speed reducer to two systems;
A pair of differential output shafts extending coaxially from the differential device to the drive shaft;
A pair of drive wheels coupled to an end of the differential output shaft;
A housing that houses the electric motor, the reduction gear, and the differential;
A plurality of first connecting members provided in the housing in a relatively non-rotatable manner and passing through the electric motor in the axial direction;
A plurality of second connecting members provided in the housing in a relatively non-rotatable manner and penetrating the speed reducer in the axial direction;
The housing is provided between a cylindrical first housing, second and third housings detachably provided at both axial ends of the first housing, and the first and second housings. An intermediate member inserted into the first and second housings,
The third housing and the intermediate member are connected in the axial direction by the first connecting member,
The second housing and the intermediate member are connected in the axial direction by the second connecting member,
Drive device. The intermediate member includes a disc-shaped intermediate member main body, and cylindrical first and second cylinders that extend axially from the outer peripheral side of the intermediate member main body and are fitted into the first and second housings. An intermediate cylindrical portion, and an annular portion extending radially outward from the outer peripheral side of the intermediate member main body and sandwiched between the first and second housings,
The drive device according to claim 10 or 11. The speed reducer includes a sun gear provided at an end of the drive shaft, a plurality of planetary gears arranged on the outer peripheral side of the sun gear and meshing with the sun gear, and an annular shape arranged on the outer circumferential side of the planetary gear and meshed with the planetary gear Ring gear,
The second connecting member penetrates the ring gear in the axial direction.
The drive device according to any one of claims 9 to 12. The electric motor includes the drive shaft, a rotor fixed to the outer peripheral side of the drive shaft, and a stator that is disposed on the outer peripheral side of the rotor and is inserted into the first housing.
The first connecting member penetrates the stator in the axial direction.
The drive device according to claim 9.

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