JP2016176586A - Motor drive device with speed reducer for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assemblability in assembling an input gear shaft, an output gear shaft and one or more intermediate gear shafts into a speed reducer casing.SOLUTION: When an input gear shaft 23R, an output gear shaft 25R and one or more intermediate gear shafts 24R are assembled in to speed reducer casings 20a, 20bR divided in an axial direction, a slide amount of at least one gear shaft in assembly to the speed reducer casings 20a, 20bR is made different from a slide amount of the other gear shafts. Consequently, positions of the gear shafts in assembly can be adjusted, and assemblability is improved compared to a case where all gear shafts are simultaneously assembled.SELECTED DRAWING: Figure 6

Description

  The present invention is a parallel gear shaft speed reducer that includes an electric motor and a speed reducer that decelerates the power of the electric motor and transmits it to a drive wheel, and the speed reducer has a plurality of gear shafts arranged in parallel in a casing. The present invention relates to a motor drive device with a reduction gear for automobiles.

  Patent Documents 1 and 2 disclose a motor drive device with a reduction gear for an automobile that includes two electric motors and a reduction gear for independently driving left and right drive wheels.

  As shown in FIG. 11, this conventional motor drive device with a reduction gear for an automobile includes left and right electric motors 101 that individually drive left and right drive wheels, and two reduction gears 102 that reduce the rotation of the electric motor 101. The two reduction gears 102 are arranged in the center of the left and right electric motors 101.

  As shown in FIG. 11, the speed reducer 102 includes an input gear shaft 123 having an input gear to which power is transmitted from the motor shaft 112, a large-diameter gear that meshes with the input gear of the input gear shaft 123, and a small-diameter that meshes with the output gear. A plurality of intermediate gear shafts 124 having gears, and an output gear shaft 125 having an output gear, which is pulled out from the reduction gear casing 128 and transmits a driving force to the driving wheels via the constant velocity joint 126 and the drive shaft 127. It is a parallel gear reducer provided. Each gear is a helical gear, and each gear shaft is supported by a reduction gear casing 128 so that both ends can be rotated by rolling bearings. The left and right gear shafts are arranged coaxially with each other.

Japanese Patent Laid-Open No. 11-243664 US2012 / 0304790A1

  By the way, the assembly of the parallel gear shaft reduction gear used for the motor drive device with a reduction gear for automobiles is performed as follows.

  For example, as shown in FIG. 12, the speed reducer casing 128 that accommodates the gear shafts 123, 124, and 125 is divided into a central casing 128a and a side casing 128b in the axial direction, and the central casing 128a divided in the axial direction. Bearing fitting holes 123c, 123d, 124c for fitting rolling bearings 123a, 123b, 124a, 124b, 125a, 125b provided at both ends of the gear shafts 123, 124, 125 to the opposing surface of the side casing 128b. 124d, 125c, and 125d are provided.

  When assembling the right parallel gear shaft speed reducer, rolling bearings 123a, 123b, 124a, 124b, 125a, 125b are attached to both ends of the gear shafts 123, 124, 125 as shown in FIG. After that, as shown in FIG. 13, in the bearing fitting holes 123c, 124c, and 125c of the central casing 128a, each of the gear shaft assemblies having the rolling bearings 123a, 123b, 124a, 124b, 125a, and 125b attached to both ends. One rolling bearing 123a, 124a, 125a is inserted. Then, as shown in FIG. 14, while inserting the other rolling bearings 123b, 124b, 125b of each gear shaft assembly into the bearing fitting holes 123d, 124d, 125d of the other side casing 128b, the side casing 128b This is a procedure for assembling to the central casing 128a. At this time, the input gear shaft 123 and the output shaft 125 are also fitted with oil seals 129 and 130 attached in advance to the side casing 128b. Further, the center casing 128a and the side casing 128b are positioned by knock pins 131.

  However, as shown in FIG. 14, when the rolling bearings 123b, 124b, 125b of the gear shaft assembly are inserted into the bearing fitting holes 123d, 124d, 125d of the side casing 128b, the bearing fitting holes 123d, 124d, If the positional accuracy of 125d is poor, the three gear shafts 123, 124, 125 are inclined. That is, by driving with the meshing surfaces of the gears tilted, the rolling bearings 123a, 123b, 124a, 124b, 125a, 125b that support the gear tooth surfaces and the gear shafts 123, 124, 125 are damaged due to wear or fatigue. May cause. It can also cause increased vibration.

  In order to prevent wear of the rolling bearings 123a, 123b, 124a, 124b, 125a, and 125b that support the gear tooth surfaces and the gear shafts 123, 124, and 125, damage due to fatigue, and increase in vibration, the central casing 128a and the side surfaces are prevented. The positional accuracy between the bearing fitting holes 123c, 123d, 124c, 124d, 125c, and 125d of the casing 128b needs to be high. Therefore, the rolling bearings 123b, 124b, and 125b of the three gear shafts 123, 124, and 125 are simultaneously inserted into the entrances of the three bearing fitting holes 123d, 124d, and 125d of the side casing 128b as shown in FIG. It is very difficult to do.

  Further, the input gear shaft 123 and the output gear shaft 125 penetrate through the end portions of the bearing fitting holes 123d and 125d of the side casing 128b for connection with the electric motor 101 and the constant velocity joint 126 (see FIG. 15). Therefore, fine adjustment is possible when the rolling bearings 123b and 125b are inserted. However, since the end of the bearing fitting hole 124d of the side casing 128b does not penetrate the intermediate gear shaft 124, the rolling bearing 124b is inserted. It is difficult to make fine adjustments.

  In the assembly procedure shown in FIGS. 12 to 14, the gear shaft assembly is formed by attaching rolling bearings 123 a, 123 b, 124 a, 124 b, 125 a, 125 b to both ends of each gear shaft 123, 124, 125. Later, the rolling bearings 123a, 123b, 124a, 124b, 125a, 125b are inserted into the bearing fitting holes 123c, 124c, 125c of the central casing 128a and the bearing fitting holes 123d, 124d, 125d of the side casing 128b. Is adopted. Therefore, the fitting between the both ends of each gear shaft 123, 124, 125 and the bearing inner rings of the rolling bearings 123a, 123b, 124a, 124b, 125a, 125b is a tight fitting, and the rolling bearings 123a, 123b, 124a, The fitting between the bearing outer rings 124b, 125a, 125b and the bearing fitting holes 123c, 123d, 124c, 124d, 125c, 125d is a clearance fitting.

  As shown in FIG. 15, the assembly procedure is as follows: rolling bearings 123a, 123b, 124a, 124b, 125a, 125b, bearing fitting holes 123c, 124c, 125c in the central casing 128a and bearing fitting holes 123d in the side casing 128b. , 124d, 125d first, and then both ends of the gear shafts 123, 124, 125 are fitted into the rolling bearings 123a, 123b, 124a, 124b, 125a, 125b. The fitting between the bearing outer rings of the bearings 123a, 123b, 124a, 124b, 125a, 125b and the bearing fitting holes 123c, 123d, 124c, 124d, 125c, 125d is tight fitting, and the rolling bearings 123a, 123b, 124a are fitted. , 124b, 125a, 125b bearing inner rings and each Fitting the two ends of the axle 123, 124, 125 will clearance fit.

  As described above, the rolling bearings 123b, 124b, and 125b of the three gear shafts 123, 124, and 125 are provided at the entrances of the three bearing fitting holes 123d, 124d, and 125d of the side casing 128b, as shown in FIG. It is very difficult to insert at the same time.

That is, the sliding amounts L ₁₂₃ , L ₁₂₄ , L ₁₂₅ of the gear shafts ₁₂₃ , ₁₂₄ , ₁₂₅ from the entrance to the bottom of the three bearing fitting holes ₁₂₃ d, ₁₂₄ d, ₁₂₅ d during assembly are as shown in FIG. Since all are set to be the same, it is difficult to insert all the gear shafts 123, 124, 125 into the bearing fitting holes 123d, 124d, 125d at the same time.

  The difficulty in assembling such a plurality of gear shafts 123, 124, 125 to the reducer casings 128a, 128b divided in the axial direction is that rolling bearings 123a, 123b, 124a, 124b as shown in FIG. , 125a, 125b and the bearing fitting holes 123c, 123d, 124c, 124d, 125c, 125d, even when the fitting is a clearance fitting, the rolling bearings 123a, 123b, 124a as shown in FIG. , 124b, 125a, 125b and the bearing fitting holes 123c, 123d, 124c, 124d, 125c, 125d are tightly fitted, and the rolling bearings 123a, 123b, 124a, 124b, 125a, 125b are fitted. The inner ring of the bearing and the both ends of each gear shaft 123, 124, 125 are fitted. Or The same is true if you have fitted.

  Further, the problem at the time of assembling in such a reduction gear is not limited to the configuration of the three-shaft gear shaft as in the above example, but also applies to the configuration of four or more gear shafts. The same occurs not only in the motor drive device but also in a one-motor type motor drive device.

  Therefore, according to the present invention, when assembling a reduction gear provided with a plurality of gear shafts, one end of the plurality of gear shafts can be assembled at the same time into the bearing fitting holes of the divided reduction gear casings. It is an object to improve the assemblability of the reduction gear by avoiding the above and enabling the position adjustment of the gear shaft at the time of assembly.

  In order to solve the above-described problems, the present invention includes an electric motor and a speed reducer that decelerates the power of the electric motor and transmits the power to the drive wheels. The speed reducer is an input that receives power from the motor shaft. One or more having an input gear shaft having gears, an output gear shaft having an output gear for transmitting a driving force to the drive wheels via the drive shaft, and an intermediate gear provided between the input gear shaft and the output gear shaft In the motor drive device with a reduction gear for an automobile, which is a parallel gear shaft speed reducer arranged in parallel with the intermediate gear shaft, a plurality of gear shafts constituting the parallel gear shaft speed reducer are parallel gear shaft speed reductions at both ends thereof. Of the fitting between the inner ring of the rolling bearing and the gear shaft and the fitting between the outer ring of the rolling bearing and the bearing fitting hole of the reduction gear casing, supported by the reduction gear casing that houses the machine through the rolling bearing, One is clearance fitting and the other is tight fitting, the reduction gear casing is divided into two in the axial direction, and the rolling bearings provided at both ends of each gear shaft are divided in the axial direction. With respect to all the rolling bearings supported by at least one of the two reduction gear casings, a bearing ring that is clearance-fitted, and a member that is clearance-fitted with the bearing ring At least one of the sliding amounts at the time of assembling the speed reducer casing is different from the others.

  With respect to all the rolling bearings supported by at least one of the two reduction gear casings, the sliding amount at the time of assembling the reduction gear casing between the bearing ring for clearance fitting and the member for clearance fitting with the bearing ring is all It may be different.

The gear shaft housed in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and when the reduction gear casing of the input gear shaft and the output gear shaft is assembled. The sliding amount at may be smaller than the sliding amount when the reduction gear casing of the intermediate gear shaft is assembled.
The assembly structure of the gear shaft and the reduction gear casing can be employed in a motor drive device with a reduction gear for an automobile that includes one electric motor and one reduction gear.

  The assembly structure of the gear shaft and the speed reducer casing includes two electric motors for independently driving the left and right driving wheels, and the power of the two electric motors is individually decelerated to reduce the left and right driving motors. The present invention can also be adopted in a motor drive device with a vehicle speed reducer that includes two speed reducers that transmit to drive wheels.

  The gear shaft housed in the reducer casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, between the input gear shaft and the reducer casing and between the output gear shaft and the speed reducer. An oil seal is attached to each of the machine casings, and for all the gear shafts, after the bearing wheel to be clearance-fitted and the member to be clearance-fitted to the bearing wheel are fitted, the input gear shaft and The oil seal is preferably disposed at an axial position where the output gear shaft is fitted with the oil seal.

  The gear shaft accommodated in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and the two divided reduction gear casings are positioned by knock pins. With regard to all gear shafts, the bearing ring to be clearance-fitted and the member to be clearance-fitted to the bearing ring are fitted, and after the input gear shaft and the output gear shaft are fitted to the oil seal, the knotpins are fitted. It is preferable to set the protruding height of the knock pin to be matched.

  The gear shaft accommodated in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and the two divided reduction gear casings are positioned by in-row coupling. With respect to all gear shafts, after a bearing ring to be clearance-fitted and a member to be clearance-fitted to the bearing ring are fitted, and an input shaft and an output shaft are fitted to an oil seal, It is preferable that the speed reducer casing has a protrusion height of the spigot protrusion in which the spigot protrusion of the spigot joint fits into the spigot recess.

  As described above, according to the present invention, the amount of sliding at the time of assembling the reduction gear casing of at least one gear shaft is different from that of other gear shafts, so that all gear shafts can be assembled at the same time. However, the position can be adjusted and the assemblability is improved.

  In addition, the assemblability is further improved by adopting a configuration in which the slide amounts are different when the reduction gear casings of all the gear shafts are assembled.

  Furthermore, by adopting a configuration in which one or more intermediate gear shafts are fitted first, after the intermediate gear shafts are fitted, the input gear shaft opening and the output gear shaft opening of the reduction gear casing are used. Thus, fine adjustment of the assembly becomes possible.

  Further, after the rolling bearings supporting all the gear shafts are fitted to the rolling bearings and the members to be clearance-fitted, the oils are attached in advance to the input gear shaft opening and the output gear shaft opening of the reduction casing. By arranging the axial position of the oil seal at the axial height where the input gear shaft and the output gear shaft are fitted to the seal, the oil seal prevents position adjustment when the reducer housing is assembled. Can be prevented.

  Furthermore, after the rolling bearing and the oil seal are fitted, the knock pin protruding height at which the knock pin is fitted prevents the position adjustment from being hindered when the reducer housing is assembled and when the oil seal is fitted. it can.

It is a cross-sectional top view which shows embodiment of the motor drive device with a reduction gear for motor vehicles of the 2 motor type to which this invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view showing an example of an electric vehicle using a two-motor type motor drive device with a reduction gear for an automobile according to the present invention. It is the end elevation which looked at the gear train of the embodiment of FIG. 1 from the axial direction. It is the cross-sectional top view which decomposed | disassembled the reduction gear part of FIG. It is a cross-sectional top view which shows the step in the middle of assembling the reduction gear on the right side of FIG. It is a cross-sectional top view which shows an example of the positional relationship of the gear shaft and reduction gear casing at the time of the assembly of the reduction gear on the right side of FIG. It is a cross-sectional top view which shows the other example of the positional relationship of the gear shaft and reduction gear casing at the time of the assembly of the reduction gear of the right side of FIG. It is a cross-sectional top view which shows the other example of the positional relationship of the gear shaft and reduction gear casing at the time of the assembly of the reduction gear of the right side of FIG. It is a cross-sectional top view which shows another example of an assembly of the right reduction gear. FIG. 10 is a cross-sectional plan view illustrating another example of the assembly example of FIG. 9. It is a cross-sectional top view which shows the motor drive device with a conventional motor type reduction gear for motor vehicles. It is a reference cross-sectional top view which shows the procedure of incorporating a gear shaft in a reduction gear casing. It is a reference cross-sectional top view which shows the procedure of incorporating a gear shaft in a reduction gear casing. It is a reference cross-sectional top view which shows the procedure of incorporating a gear shaft in a reduction gear casing. It is a reference cross-sectional top view which shows another procedure which integrates a gear shaft in a reduction gear casing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  A motor drive device A with a reduction gear for an automobile shown in FIG. 1 has a reduction gear casing 20 that houses two reduction gears 2L and 2R in parallel on the left and right sides, and two electric motors on the left and right sides of the reduction gear casing 20. 1L and 1R motor casings 3L and 3R are fixedly arranged.

  The electric vehicle B shown in FIG. 2 is a front-wheel drive system, and is a two-motor type vehicle deceleration that independently drives a chassis 41, front wheels 42 as drive wheels, rear wheels 43, and left and right drive wheels. The motor drive device A with a two-motor type automobile reduction gear is mounted on the chassis 41 at the center position of the left and right front wheels 42 which are drive wheels. The driving force of the motor drive device A with a reduction gear is transmitted to the front wheels 42 that are the left and right drive wheels via the constant velocity joint 15 and the drive shaft 16.

  As a mounting form of the two-motor type motor drive device A with a reduction gear for automobiles, a rear wheel drive system or a four wheel drive system may be used in addition to the front wheel drive system shown in FIG.

  As shown in FIG. 1, the left and right electric motors 1 </ b> L and 1 </ b> R in the two-motor type motor drive device A with a reduction gear for an automobile are accommodated in motor casings 3 </ b> L and 3 </ b> R.

  The motor casings 3L and 3R include cylindrical motor casing bodies 3aL and 3aR, outer walls 3bL and 3bR that close the outer surfaces of the motor casing bodies 3aL and 3aR, and reduction gears on the inner surfaces of the motor casing bodies 3aL and 3aR. It consists of inner walls 3cL and 3cR separated from 2L and 2R. The inner walls 3cL and 3cR of the motor casing bodies 3aL and 3aR are provided with openings for drawing out the motor shaft 12a.

  As shown in FIG. 1, the electric motors 1 </ b> L and 1 </ b> R are of a radial gap type in which a stator 11 is provided on the inner peripheral surface of the motor casing body 3 aL and 3 aR, and a rotor 12 is provided on the inner periphery of the stator 11. I am using something. The electric motors 1L and 1R may be axial gap types.

  The rotor 12 has a motor shaft 12a in the center, and the motor shaft 12a is drawn from the openings of the inner side walls 3cL and 3cR of the motor casing bodies 3aL and 3aR to the speed reducers 2L and 2R, respectively. A seal member 13 is provided between the openings of the motor casing bodies 3aL and 3aR and the motor shaft 12a.

  The motor shaft 12a is rotatably supported by the rolling bearings 14a and 14b on the inner side walls 3cL and 3cR and the outer side walls 3bL and 3bR of the motor casing bodies 3aL and 3aR (FIG. 1).

  As shown in FIG. 1, a speed reducer casing 20 that accommodates two speed reducers 2L and 2R provided in parallel in the left and right is a central casing 20a and left and right side casings 20bL fixed to both side surfaces of the central casing 20a. , 20bR three-piece structure. The left and right side casings 20bL and 20bR are fixed to the openings on both sides of the central casing 20a by a plurality of bolts (not shown).

  By fixing the side surface of the side casings 20bL and 20bR of the reduction gear casing 20 on the outboard side and the inner side walls 3cL and 3cR of the motor casing bodies 3aL and 3aR of the electric motors 1L and 1R with a plurality of bolts 29, the reduction gears are obtained. Two electric motors 1L and 1R are fixedly arranged on the left and right sides of the casing 20 (FIG. 1).

  As shown in FIG. 1, a partition wall 21 is provided at the center of the center casing 20a. The reduction gear casing 20 is divided into right and left parts by the partition wall 21, and independent left and right accommodation chambers for accommodating the two reduction gears 2L, 2R are provided in parallel.

  As shown in FIGS. 1 and 4, the speed reducers 2L and 2R are provided symmetrically and have input gear shafts 23L and 23R having an input gear 23a to which power is transmitted from the motor shaft 12a, and the input gear 23a. Intermediate gear shafts 24L, 24R having a large diameter gear 24a meshing with the output gear 25a, and a small diameter gear 24b meshing with the output gear 25a, and an output gear 25a. This is a parallel gear reducer including output gear shafts 25L and 25R that transmit a driving force to the driving wheels via 2). The left and right input gear shafts 23L and 23R, intermediate gear shafts 24L and 24R, and output gear shafts 25L and 25R are arranged coaxially.

  Both ends of the input gear shafts 23L, 23R of the speed reducers 2L, 2R roll into bearing fitting holes 27a formed on both the left and right sides of the partition wall 21 of the central casing 20a and bearing fitting holes 27b formed in the side casings 20bL, 20bR. The bearings 28a and 28b are rotatably supported.

  The end portions on the outboard side of the input gear shafts 23L and 23R are drawn outward from the opening portions 27c provided in the side casings 20bL and 20bR, and the openings 27c and the outer end portions of the input gear shafts 23L and 23R are connected to each other. An oil seal 31 is provided between them to prevent leakage of the lubricating oil filled in the speed reducers 2L and 2R.

  The input gear shafts 23L and 23R have a hollow structure, and the motor shaft 12a is inserted into the hollow input gear shafts 23L and 23R. The input gear shafts 23L, 23R and the motor shaft 12a are spline-coupled.

  The intermediate gear shafts 24L and 24R are stepped gears having a large-diameter gear 24a meshing with the input gear 23a and a small-diameter gear 24b meshing with the output gear 25a on the outer peripheral surface. At both ends of the intermediate gear shafts 24L and 24R, rolling bearings 34a and 34b are formed into bearing fitting holes 32a formed on both surfaces of the partition wall 21 of the central casing 20a and bearing fitting holes 32b formed on the side casings 20bL and 20bR. Is supported through.

  The output gear shafts 25L and 25R have a large-diameter output gear 25a, and are formed in bearing fitting holes 35a formed on both surfaces of the partition wall 21 of the central casing 20a and bearing fitting holes 35b formed on the side casings 20bL and 20bR. It is supported by rolling bearings 37a and 37b.

  Outboard side ends of the output gear shafts 25L and 25R are pulled out to the outside of the reduction gear casing 20 through openings 35c formed in the side casings 20bL and 20bR, and the output gear shafts 25L and 25R are pulled out to the outboard side. The outer ring member of the constant velocity joint 15 is spline-coupled (including serrated coupling) to the outer peripheral surface of the end portion.

  The constant velocity joint 15 coupled to the output gear shafts 25L and 25R is connected to the drive wheels via the drive shaft 16 (FIG. 2).

  An oil seal 39 is provided between the end of the output gear shafts 25L and 25R on the outboard side and the opening 35c formed in the side casings 20bL and 20bR, and leakage of the lubricating oil filled in the speed reducers 2L and 2R occurs. Is preventing.

  The input gear shafts 23L and 23R, the intermediate gear shafts 24L and 24R, and the output gear shafts 25L and 25R of the two left and right speed reducers 2L and 2R are coaxially arranged.

  The speed reducers 2L and 2R are symmetrical, and the assembly procedure will be described below.

  First, as shown in FIG. 4, by attaching rolling bearings 28a, 28b, 34a, 34b, 37a, 37b to both ends of the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R, a gear shaft assembly is obtained. The rolling bearings 28a, 28b, 34a, 34b, 37a, 37b are fitted into the bearing fitting holes 27a, 32a, 35a of the central casing 20a and the bearing fitting holes 27b, 32b, 35b of the side casing 20bR. Explain the procedure of putting in. In this assembling procedure, the both end portions of the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R are fitted to the bearing inner rings of the rolling bearings 28a, 28b, 34a, 34b, 37a, and 37b. Assembling is carried out with clearance fitting between the bearing outer rings of the rolling bearings 28a, 28b, 34a, 34b, 37a, 37b and the bearing fitting holes 27a, 27b, 32a, 32b, 35a, 35b. It is an example. Hereinafter, the assembly procedure of the right reduction gear 2R will be described.

  In this example, first, as shown in FIG. 5, the rolling bearing 28a attached to the input gear shaft 23R and the rolling bearing 34a attached to the intermediate gear shaft 24R are inserted into the bearing fitting holes 27a, 32a and 35a of the central casing 20a. Then, each bearing outer ring of the rolling bearing 37a attached to the output gear shaft 25R is inserted by clearance fitting.

  Thereafter, as shown in FIG. 6, the side casing 20bR is put on the gear shafts of the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R, and the bearing fitting holes 27b, 32b, 35b of the side casing 20bR are covered. The bearing outer rings of the rolling bearing 28b attached to the input gear shaft 23R, the rolling bearing 34b attached to the intermediate gear shaft 24R, and the rolling bearing 37b attached to the output gear shaft 25R are inserted by clearance fitting.

In the example of FIG. 6, the sliding amount L ₂₃ in which the rolling bearing 28b attached to the input gear shaft 23R is inserted into the bearing fitting hole 27b of the side casing 20bR and slides, that is, from the entrance to the bottom of the bearing fitting hole 27b. And a sliding amount L ₂₄ that slides when the rolling bearing 34b attached to the intermediate gear shaft 24R is inserted into the bearing fitting hole 32b of the side casing 20bR, that is, the distance from the entrance to the bottom of the bearing fitting hole 32b, The sliding amount L ₂₅ in which the rolling bearing 37b attached to the output gear shaft 25R is inserted and slid into the bearing fitting hole 35b of the side casing 20bR, that is, out of the distance from the entrance to the bottom of the bearing fitting hole 35b, is the bearing. the sliding amount L ₂₃ of the rolling bearing 28b mounted on the input gear shaft 23R in the fitting hole 27b is inserted and slides, among other Sliding amount L ₂₄ of the gear shaft 24R, and smaller than the sliding distance L ₂₅ of the output gear shaft 25R, before rolling bearing 28b mounted on the input gear shaft 23R to the bearing fitting hole 27b is inserted, the intermediate gear shaft The rolling bearing 34b of 24R and the rolling bearing 37b of the output gear shaft 25R are fitted in the bearing fitting holes 32b and 35b.

That is, by satisfying the relationship of L ₂₃ <L ₂₄ (L ₂₅ ), the rolling bearing 28b of the input gear shaft 23R, the rolling bearing 34b of the intermediate gear shaft 24R, and the rolling bearing 37b of the output gear shaft 25R are bearing-fitted. First, the rolling bearing 34b of the intermediate gear shaft 24R and the rolling bearing 37b of the output gear shaft 25R are first fitted into the bearing fitting holes 32b and 35b, not simultaneously with the joint holes 27b, 32b and 35b. Since the rolling bearing 28b of the input gear shaft 23R can be fitted into the bearing fitting hole 27b, when the rolling bearing 28b of the input gear shaft 23R is fitted into the bearing fitting hole 27b, it is easily fitted while adjusting the position. Can do.

In the example of FIG. 6, one of the three gear shafts is fitted later than the other two gear shafts. However, as shown in FIG. L ₂₃ , L ₂₄ and L ₂₅ may all be different. In the example of FIG. 7, the relationship is L ₂₃ <L ₂₅ <L ₂₄ . Regardless of the relationship between FIG. 6 and FIG. 7, the relationship between L ₂₃ , L ₂₄ , and L ₂₅ can be changed as appropriate.

Further, an intermediate gear shaft 24R one or more, i.e., 4 when assembling the reduction gear 2R having gear shaft above the gear shaft, a sliding amount L ₂₄ of the intermediate gear shaft 24R of the other gear shaft sliding amount By making it larger than L ₂₃ and L ₂₅ , one or more intermediate gear shafts 24R can be fitted first, and after the intermediate gear shaft 24R is fitted, the input gear shaft 23R and the output gear When the shaft 25R is fitted, the position adjustment can be performed using the openings 27c and 35c of the bearing fitting holes 27b and 35b of the input gear shaft 23R and the output gear shaft 25R provided in the side casing 20bR.

Furthermore, in the examples of FIGS. 6 and 7, the rolling bearings 28b, 34b, and 37b of all the gear shafts (the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R) are connected to the bearing fitting holes 27b, 32b, and 35b. Are fitted to the openings 27c, 35c of the bearing fitting holes 27b, 35b of the input gear shaft 23R, and the fitting portions of the input gear shaft 23R and the output gear shaft 25R. The oil seals 31 and 39 are arranged at the height in the axial direction between which the gaps L ₁ and L ₂ are provided, so that the oil seals 31 and 39 can be adjusted when the side casing 20bR is assembled. So as not to interfere.

Further, in the example of FIGS. 6 and 7, a plurality of knock pins 33a are provided on the end surface of the central casing 20a, and pin holes 33b into which the knock pins 33a are fitted are provided on the end surface of the side casing 20bR. The casing 20bR can be positioned. The height of the knock pin 33a is such that the knock pin 33a is pinned after the input gear shaft 23R and the output gear shaft 25R are fitted to the oil seals 31 and 39 of the side casing 20bR. The front end of the knock pin 33a and the side casing 20bR are located between the oil seals 31 and 39 and the fitting portions of the input gear shaft 23R and the output gear shaft 25R so as to fit into the hole 33b, rather than the gaps L ₁ and L ₂ . is set larger the gap L ₃ between the end face.

In the example of FIG. 8, the center casing 20a and the side casing 20bR are formed by providing the spigot convex part 33c on the end surface of the central casing 20a, and providing the spigot concave part 33d into which the spigot convex part 33c is fitted on the end face of the side casing 20bR. In this example, as in the example of FIG. 7, the height of the inlay projection 33c is set so that the oil seals 31 and 39 of the side casing 20bR are connected to the input gear shaft 23R and the output. After the gear shaft 25R is fitted, the gap L between the oil seals 31 and 39, the input gear shaft 23R, and the fitting portion of the output gear shaft 25R so that the spigot convex portion 33c fits into the spigot concave portion 33d. ₁ and L ₂ , the gap L ₃ between the tip of the spigot protrusion 33 c and the end surface of the side casing 20 b R is set larger. The

  Next, in the example of FIGS. 9 and 10, first, the rolling bearings 28 a, 28 b, and the bearing fitting holes 27 a, 32 a, 35 a of the central casing 20 a and the bearing fitting holes 27 b, 32 b, 35 b of the side casing 20 b R are provided. After attaching 34a, 34b, 37a, 37b, both ends of the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R are fitted to the rolling bearings 28a, 28b, 34a, 34b, 37a, 37b. is there. In this assembling procedure, the gap between the both ends of each of the input gear shaft 23R, the intermediate gear shaft 24R, and the output gear shaft 25R and the bearing inner rings of the rolling bearings 28a, 28b, 34a, 34b, 37a, 37b is clearance. Assembling is performed by fitting the rolling bearings 28a, 28b, 34a, 34b, 37a, and 37b with the bearing fitting holes 27a, 27b, 32a, 32b, 35a, and 35b. It is an example.

Examples of Figure 9, the sliding amount L ₂₃ of the input gear shaft 23R, is set to be smaller than the sliding amount L ₂₅ of the sliding amount L ₂₄ of the intermediate gear shaft 24R output gear shaft 25R, i.e., L ₂₃ <L ₂₄ ( L ₂₅ ), the intermediate gear shaft 24R and the output gear shaft 25R are connected to the bearing fitting hole 32b before the input gear shaft 23R is fitted to the rolling bearing 28b attached to the bearing fitting hole 27b. Are fitted into a rolling bearing 34b attached to the rolling bearing 37b and a rolling bearing 37b attached to the bearing fitting hole 35b.

Example of FIG. 10, the sliding amount L ₂₄ of the intermediate gear shaft 24R, the input gear shaft and greater than the sliding amount L ₂₃ and the output gear shaft sliding amount L ₂₅ of 25R of 23R, the input gear shaft 23R sliding amount L ₂₃ Is larger than the slide amount L ₂₅ of the output gear shaft 25R, that is, the relationship of L ₂₅ <L ₂₃ <L ₂₄ is established, so that the intermediate gear shaft 24R is the earliest rolling bearing attached to the bearing fitting hole 32b. 34b. Regardless of the relationship between FIGS. 9 and 10, the relationship between L ₂₃ , L ₂₄ , and L ₂₅ can be changed as appropriate.

  The above embodiment has been described by taking the two-motor type motor drive device A with a reduction gear for an automobile as an example, but the assembling procedure of the reduction gear in the present invention is a one-motor type motor drive device with a reduction gear for an automobile. The present invention can also be applied to the assembly of a reduction gear. In the case of a one-motor type motor drive device with a reduction gear for an automobile, the reduction gear casing has a configuration of a motor side casing and a reduction gear side casing, and the motor side casing is a two-motor type motor drive with an automobile reduction gear. The reduction gear side casing corresponds to the central casing 20a in the side casings 20bL and 20bR in the apparatus A.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. The scope of the present invention is claimed. The equivalent meanings recited in the claims, and all modifications within the scope.

1L, 1R: Electric motor 2L, 2R: Reducer 3L, 3R: Motor casing 3aL, 3aR: Motor casing body 3bL, 3bR: Outer wall 3cL, 3cR: Inner wall 11: Stator 12: Rotor 12a: Motor shaft 13: Seal Members 14a, 14b: Rolling bearing 15: Constant velocity joint 16: Drive shaft 20: Reduction gear casing 20a: Central casing 20bL, 20bR: Side casing 21: Partition walls 23L, 23R: Input gear shaft 23a: Input gear shafts 24L, 24R: Intermediate gear shaft 24a: Large-diameter gear 24b: Small-diameter gear 25L, 25R: Output gear shaft 25a: Output gear 27a, 27b: Bearing fitting hole 27c: Openings 28a, 28b: Rolling bearing 29: Bolt 31: Oil seal 32a, 32b: Bearing fitting hole 33a: Knock pin 33b: pin hole 33c: spigot protrusion 33d: spigot recess 34a, 34b: rolling bearing 35a, 35b: bearing fitting hole 35c: opening 37a, 37b: rolling bearing 39: oil seal 41: chassis 42: front wheel 43: Rear wheel A: Motor drive device B with reduction gear for automobile B: Electric vehicle

Claims (8)

  An electric motor and a speed reducer that decelerates the power of the electric motor and transmits it to the drive wheel. The speed reducer includes an input gear shaft having an input gear to which power is transmitted from the motor shaft, and a drive shaft. A parallel gear shaft in which an output gear shaft having an output gear for transmitting a driving force to a driving wheel and one or more intermediate gear shafts having an intermediate gear provided between the input gear shaft and the output gear shaft are arranged in parallel. In the motor drive device with a reduction gear for automobiles, which is a reduction gear, a plurality of gear shafts constituting the parallel gear shaft reduction gear are provided with rolling bearings with respect to a reduction gear casing accommodating the parallel gear shaft reduction gear at both ends thereof. Of the inner ring of the rolling bearing and the gear shaft, and the fitting of the outer ring of the rolling bearing and the bearing fitting hole of the reducer casing, one is clearance fitting and the other is tight fitting. The reduction gear casing is divided into two in the axial direction, and rolling bearings provided at both ends of each gear shaft are supported by the respective bearing fitting holes of the two reduction gear casings divided in the axial direction. With respect to all the rolling bearings supported by at least one of the two reduction gear casings, the sliding amount at the time of assembling the reduction gear casing between the bearing ring for clearance fitting and the bearing ring and the member for clearance fitting. A motor drive device with a reduction gear for automobiles, wherein at least one of the above is different from the others.   With respect to all the rolling bearings supported by at least one of the two reduction gear casings, the sliding amount at the time of assembling the reduction gear casing between the bearing ring for clearance fitting and the member for clearance fitting with the bearing ring is all The motor drive apparatus with a reduction gear for an automobile according to claim 1, which is different.   The gear shaft housed in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and when the reduction gear casing of the input gear shaft and the output gear shaft is assembled. The motor drive device with a reduction gear for an automobile according to claim 1 or 2, wherein the slide amount is smaller than the slide amount when the reduction gear casing of the intermediate gear shaft is assembled.   The motor drive device with a reduction gear for an automobile according to claim 1, comprising one electric motor and one reduction gear.   2. An electric motor for driving the left and right drive wheels independently, and two speed reducers for individually decelerating the power of the two electric motors and transmitting them to the left and right drive wheels. 4. A motor drive device with a reduction gear for an automobile according to 3.   The gear shaft housed in the reducer casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, between the input gear shaft and the reducer casing and between the output gear shaft and the speed reducer. An oil seal is attached to each of the machine casings, and for all the gear shafts, after the bearing wheel to be clearance-fitted and the member to be clearance-fitted to the bearing wheel are fitted, the input gear shaft and 6. The motor drive unit with a reduction gear for an automobile according to claim 1, wherein the oil seal is disposed at an axial position where the output gear shaft is fitted with the oil seal.   The gear shaft housed in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and the two divided reduction gear casings are positioned by knock pins. With respect to all gear shafts, a bearing ring to be clearance-fitted and a member to be clearance-fitted to the bearing ring are fitted, and after the input gear shaft and the output gear shaft are fitted to the oil seal, the knotpin is fitted. The motor drive device with a reduction gear for an automobile according to claim 1, wherein the knock pin has a protruding height.   The gear shaft accommodated in the reduction gear casing is one input gear shaft, one output gear shaft, and one or more intermediate gear shafts, and the two divided reduction gear casings are positioned by in-row coupling. Then, with respect to all the gear shafts, after the bearing ring to be clearance-fitted and the member to be clearance-fitted to the bearing ring are fitted, and the input shaft and the output shaft are fitted to the oil seal, two speed reducers The motor drive device with a reduction gear for an automobile according to any one of claims 1 to 6, characterized in that the casing has a projection height of the spigot projection that the spigot projection of the spigot joint fits into the spigot recess.

Images