JPH08200381A - Electric vehicle drive joint - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The bolts can be easily inserted and removed, and the work can be done in a short time. [Structure] A plurality of taper holes 3d for penetrating both flanges 3c are bored, and a taper pin 30 having a screw threaded at both ends is fitted into the taper hole, and a nut is attached to a screw part on the small diameter side of the taper hole. 20 is fastened to integrate the intermediate joint 3, and a tightening hole which is in a direction opposite to the tapered hole from the tightened side of the nut to the other side and which is larger than the large diameter side of the tapered hole is formed in the nut. After the hole is formed in the side flange portion and the taper pin is fitted into the flange portion, a bush is fitted between the tightening hole of the flange portion and the taper pin, and the nut is screwed onto the taper pin so as to press the bush.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device in which an electric motor shaft in an electric vehicle is used as a drive shaft and a small gear shaft of a reduction gear (gear device) connected to the axle is used as a driven shaft. The present invention relates to a joint for an electric vehicle drive device used for connecting drive shafts.

[0002]

2. Description of the Related Art An example of a conventional electric vehicle drive system joint will be described with reference to FIGS. FIG. 7 shows a structure of a conventional flexible joint and is a sectional view taken along the line AA of FIG. FIG.
Is a sectional view taken along line BB of FIG. 7 as viewed in the direction of the arrow, and FIG.
In FIGS. 7 to 9, 1 is a drive shaft, 11 is a driven shaft that axially opposes the drive shaft 1, and 2 and 12 are bosses fitted to the tapered tip portions of the drive shaft 1 and the driven shaft 11, respectively. It is a joint that is attached and has radial joint arms 2a and 12a formed on the outer circumference of the boss in opposite directions.

3, 3 have radial joint arms 3a, 13a formed in opposite directions at one end portion, and a flange is formed at the other end portion, and a plurality of reamer bolts 9 are provided between these flanges. Is an intermediate joint that is integrated by being coupled with a nut 20.
4 and 14 are seat plates 6 at each corner on one diagonal line.
Via reamer bolt 5 and nut 8
Bearing surfaces 2b, 1 at the tips of the radial joint arms 2a, 12a of 2
It is a regular quadrangular frame-shaped leaf spring which is fastened to 2b and whose nut 8 is prevented from rotating by a washer 7. The reamer bolt 5 and the nut 8 are fixed to the other diagonal corners of the leaf springs 4 and 14 by a washer 7 via a washer 6. In the flexible joint configured as described above, the rotational power from the drive shaft 1 is generated by the joint 2, the leaf spring 4, the intermediate joint 3,
It is transmitted to the driven shaft 11 via the intermediate joint 13, the leaf spring 14, and the joint 12. The relative displacement between the axes of the drive shaft 1 and the driven shaft 11 generated during the power transmission is absorbed by the leaf springs 4 and 14.

[0004]

In the conventional electric vehicle drive shaft joint, the flange portions of the intermediate joint are connected to each other by a plurality of reamer bolts and nuts. Therefore, when an excessive torque is generated, the flange portions are connected to each other. Reamer bolts with the same outer diameter as the flange hole diameter are used to prevent damage to the bolts by hitting them with a gap between them. For this reason, it is difficult to insert and remove the bolts, and particularly the work of connecting and disconnecting the intermediate joint flange portion of the drive device joint in an electric vehicle is a work in a narrow pit, which is a very troublesome work.

Not only a flexible joint using a leaf spring but also a gear type joint (WN joint) used for an electric vehicle drive device, a flange portion of an outer cylinder (internal gear) corresponding to an intermediate joint. The same applies to the combination of. The present invention has been made in view of the above-mentioned points, and an object thereof is to solve these drawbacks, to easily insert and remove bolts, and to provide a joint for an electric vehicle drive device that can perform work in a short time. It is provided.

[0006]

[Means for Solving the Problems] That is, the means for achieving the object are as follows: 1) Electricity for connecting a drive shaft on the electric motor side and a driven shaft on the gear unit side by intermediate joints each having a flange portion. In a vehicle drive joint, a plurality of taper holes are formed so as to pass through the flanges of both of them, and a taper pin having threads at both ends is fitted into the taper holes, and a screw part on the small diameter side of the taper hole is fitted. The nut is fastened to and the intermediate joint is integrated. 2) From the fastening side of the nut in 1) to the other side, form a tightening hole in the direction opposite to the taper hole and larger than the large diameter side hole of this taper hole in the flange part of the nut side, and attach the taper pin. After being fitted into the flange portion, a bush is fitted between the tightening hole of the flange portion and the taper pin, and a nut is screwed onto the taper pin so as to press the bush.

3) A slit is provided on the bush in the item 2),
Moreover, the inner circumference and the outer circumference of the bush are formed so as to face the inner circumference of the tightening hole and the outer circumference of the taper pin. 4) From the fastening side of the nut in 1) to the other side, in the direction opposite to the taper hole and forming a tightening taper hole larger than the large diameter side hole of this taper hole in the flange part of the nut side, After fitting on the flange part, a bush with a slit between the tightening taper hole and the taper pin of the flange part is fitted, and the nut is screwed onto the taper pin to press the bush. .

[0008]

Next, the operation will be described. Since the intermediate joint flange joint portion of the joint for an electric vehicle drive device of the present invention is configured as described above, when the taper pin is manually inserted into the taper hole of the flange portion, the screw on the small diameter side is located outside the taper hole. The taper pin can be pushed out and easily pulled in by the nut.The taper hole and the taper pin of the flange part are fitted together without a gap by the taper wedge action, and even if excessive torque occurs, the intermediate joint flange parts do not shift from each other The flange portion of the joint can be firmly joined.

When releasing the connection of the intermediate joint,
It can be easily removed by loosening and removing the nut on the small diameter side of the taper pin and tightening the screw part on the large diameter side with the nut. That is, when the taper pin moves to a slightly larger diameter side, the interference between the taper hole and the taper pin of the intermediate joint flange portion is lost, causing rattling, and the taper pin can be easily pulled out by hand. An embodiment of the present invention will be described in detail below with reference to the drawings.

[0010]

FIG. 1 is an enlarged sectional view of a flange portion of an intermediate joint showing a first embodiment of the first embodiment of the joint for an electric vehicle drive device of the present invention. In FIG. 1, both flange portions 3
a plurality of taper holes 3d and 13d for penetrating c and 13c
A taper pin 30 having threaded portions 30a and 30b at both ends is fitted into the tapered holes 3d and 13d, and the nut 20 is fastened to the male screw portion 30a on the small diameter side of the tapered holes 3d and 13d. The intermediate joints 3 and 13 are integrated together.

That is, the spigot 3 of the intermediate joints 3 and 13
The flange portions 3c and 13c at the tip end by fitting f and 13f
Respectively, and a plurality of tapered holes 3d and 13d are simultaneously formed on the concentric pitch circle, so that the tapered hole 3d of the intermediate joint 3 and the tapered hole 13d of the intermediate joint 13 are formed in a straight line. Further, threaded portions 30a and 30b are provided at both ends, and the tapered pin 30 having substantially the same diameter and the same length as the tapered holes 3d and 13d of the flange portions 3c and 13c is formed in the tapered holes 3d and 3d.
The intermediate joints 3 and 13 are integrated with each other by inserting the intermediate fittings 13 and 13d and tightening the male threaded portion 30a on the small diameter side with the nut 20 through the washer 20a. The washer 20a may be any spring washer, a washer with a claw, a washer with a tongue, or the like as long as it has a function of preventing the loosening of the nut.

FIG. 2 shows a second embodiment similar to FIG. In FIG. 2, the length of the taper part of the taper pin 31 is made slightly longer than the taper holes 3d and 13d of the flange part, and the nut 2
The contact portion of No. 1 is cut out to escape. Incidentally, 31a and 31b are male screw parts.

FIG. 3 is an enlarged sectional view of a flange portion of an intermediate joint showing an embodiment of the joint for an electric vehicle drive device according to the present invention. In FIG. 3, the tightening hole 1 is in a direction opposite to the tapered holes 3d and 16a from the fastening side of the nut 20 to the other side, and is larger than the hole 3f on the large diameter side of the tapered hole 3d.
5b is bored in the flange portion 15a on the nut side, the taper pin 30 is fitted in the flange portions 3c, 15a, and then the bush 16 is fitted between the tightening hole 15b of the flange portion 15a and the taper pin 30. The nut 20 is screwed onto the taper pin 30 so as to press.

That is, the taper pin 30 and the taper pin 3
The taper hole 3d formed in the flange portion 3c of the intermediate joint 3 on the large diameter side of 0 is configured the same as the joint of the above-described embodiment, but the flange portion 15a of the intermediate joint 15 on the small diameter side of the taper pin 30 is formed. At the same position as the tapered hole 3d of the flange portion 3c of the intermediate joint 3, a cylindrical tightening hole 15b slightly larger than the outer diameter of the taper pin 30 is bored.
It has an outer peripheral surface 16b of the same size as b, has a tapered hole 16a that matches the tapered pin 30, and when assembled, creates a gap between the tip of the hole 3f on the large diameter side and the flange surface 3e of the intermediate joint 3. Also, an integrated bush 16 having a length in which the end surface of the hole on the small diameter side is slightly projected from the flange portion 15a of the intermediate joint 15 is inserted into the nut 20 through the washer 20a, and the taper pin 30 and the flange portion of the intermediate joint 15 are inserted. 1
It is configured to be interposed between 5a. By pushing the bush 16 with the nut 20, the taper pin 30 and the bush inner diameter are brought into close contact with each other, and at the same time, the outer circumference of the bush is pushed and spread by the wedge action of the taper so that the bush 15 is brought into close contact with the tapered hole 16a of the flange portion 15a of the intermediate joint 15.

FIG. 4 is a perspective view showing an embodiment of a bush according to claim 3 of the present invention. In FIG. 4, the bush 16 is provided with a slit 16c, and the bush 16 has an inner circumference and an outer circumference. It is formed so as to face the inner circumference of the tightening hole 15b and the outer circumference of the taper pin 30. That is, the inner and outer peripheries of the bush 16 are processed so as to be in close contact with the tapered hole 16a and the outer peripheral surface 16b. Since such a bush 16 is used, the intermediate joints 3, 1
Even if there are some differences in the dimensions of the holes of the flange portions 3c and 15a of 5 and the outer diameter of the bush, the nut can be engaged and coupled to a position where both the inner and outer surfaces of the bush come into close contact with each other.

FIG. 5 is an enlarged sectional view of a flange portion of an intermediate joint showing one embodiment of the joint for an electric vehicle drive device according to the present invention. In FIG. 5, from the fastening side of the nut 20 to the other side, the tightening taper hole 18b in the direction opposite to the taper holes 3d and 18a and larger than the large diameter side hole 3f of the taper hole 3d is formed in the flange portion 17a of the nut 20 side. After the taper pin 30 is fitted to the flange portion 3d,
Tightening taper hole 18b of flange part 18a and taper pin 3
6, the bush 18 shown in FIG. 6 provided with the slit 18c is fitted, and the nut 20 is screwed onto the taper pin 30 so as to press the bush 18. In the joint configured as described above, when the taper pin 30 is pulled out, it takes a little time to move because of a gap formed between the bush tip and the intermediate joint flange surface, but the bush 18 of the present embodiment does not move. Therefore, it is easy to remove the taper pin. Further, in this embodiment, since the taper outer peripheral surface slitting configuration is in the opposite direction to the taper pin, the tightening force of the nut is more effectively transmitted to the flange coupling surface of the intermediate joint, and a large friction force is generated. It can be more firmly integrated. In the present invention, the case of a gear type joint (WN joint) and the coupling of the flange portion of the outer cylinder (internal gear) corresponding to the intermediate joint are similarly applied.

[0017]

As described above, according to the present invention, the coupling of the flange portion of the intermediate joint is changed from the conventional straight reamer hole and reamer bolt nut coupling to a tapered hole, taper pin and nut coupling. Can be easily connected and separated by tightening the small diameter side screw with a nut and separating the large diameter side screw with a nut. For this reason, even in the work in a narrow pit, the work for connecting and separating the intermediate joint can be easily performed in a short time. Further, by using the joint of the present invention, it is particularly effective when the coupling / separation work of the intermediate joint is automated by a robot.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a flange portion of an intermediate joint showing the first embodiment of the first aspect of the joint for an electric vehicle drive device of the present invention.

2 is a second embodiment similar to FIG. 1. FIG.

FIG. 3 is an enlarged sectional view of a flange portion of an intermediate joint showing an embodiment of claim 2 of the joint for an electric vehicle drive device of the present invention.

FIG. 4 is a perspective view showing an embodiment of the bush according to claim 3 of the present invention.

FIG. 5 is an enlarged sectional view of a flange portion of an intermediate joint showing an embodiment of claim 4 of the joint for an electric vehicle drive device of the present invention.

FIG. 6 is a perspective view showing an embodiment of the bush according to claim 4 of the present invention.

FIG. 7 shows a structure of a conventional flexible joint,
It is sectional drawing which follows the -A line.

8 is a cross-sectional view taken along line BB of FIG. 7 as seen in the direction of the arrows.

FIG. 9 is an enlarged cross-sectional view showing details of a joint portion of a flange of an intermediate joint.

[Explanation of symbols]

 3,13 Intermediate joint 3c, 13c, 15a, 17a Flange part 3d, 13d, 16a, 18a Tapered hole 3f Hole 3e Flange surface 20,21 Nut 15b Tightening hole 16 Bushing 16b Outer peripheral surface 16c, 18c Slotted 18b Tightening taper Hole 20a Washer 30 Tapered pin 30a, 30b Male thread

Claims (4)

[Claims] 1. A joint for an electric vehicle drive device, wherein a drive shaft on the electric motor side and a driven shaft on the gear device side are connected to each other by an intermediate joint having a flange portion, and a plurality of tapers for penetrating the both flange portions. Drill a hole and fit a taper pin with threads on both ends into the taper hole.
A joint for an electric vehicle drive device, characterized in that a nut is fastened to a screw portion on the small diameter side of the tapered hole to integrate the intermediate joint. 2. A tightening hole, which is opposite to the tapered hole from the fastening side of the nut to the other side and is larger than the large diameter side hole of the tapered hole, is formed in the flange portion of the nut side, 2. The electric vehicle drive device according to claim 1, wherein after the taper pin is fitted in the flange portion, a bush is fitted between the tightening hole of the flange portion and the taper pin, and a nut is screwed to the taper pin so as to press the bush. For fittings. 3. The joint for an electric vehicle drive device according to claim 2, wherein the bush is provided with a slit, and an inner circumference and an outer circumference of the bush are formed to face an inner circumference of the tightening hole and an outer circumference of the taper pin. 4. A tightening taper hole is formed in the flange portion on the nut side in a direction opposite to the taper hole from the fastening side of the nut to the other side and larger than the hole on the large diameter side of the taper hole. After fitting the taper pin to the flange,
A joint for an electric vehicle drive device according to claim 1, wherein a bush provided with a slit is fitted between the tightening taper hole of the flange portion and the taper pin, and a nut is screwed to the taper pin so as to press the bush.