JPH06341449A - Universal joint - Google Patents

Abstract

PURPOSE:To provide a universal joint of which assembling is easy, the number of parts is small and the shapes of parts are simplified. CONSTITUTION:First and second joint main bodies 10, 20 in which hubs 11, 21 fixing rotary shafts arein tegratedly formed with respective pairs of rotational moving pins 13A, 13B, and 23A, 23B projecting outward in the radial direction of the hubs are provided. An annular power transmitting body 30 is provided with an elastic ring 31 in which four through holes 31A, 31B, 31C, 31B to be engaged with the pins are formed and an abutment part 31a is provided, and a second elastic ring 32 to close the abutment part 31a at mounting it on the outer circumferential face of the elastic ring 31. Hereby, the rotational moving pins can be easily fitted into the elastic ring 31, the shapes are simplified, assembling is facilitated, and manufacturing cost of the parts can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint, and more particularly to a universal joint which has a small number of parts, is easy to assemble, and has a simple part shape.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 3-74632 describes a universal joint for the purpose of improving assembly accuracy and reducing component manufacturing cost. As shown in FIG. 3, the pair of left and right joint bodies 110 and 120 include hubs 111 and 121 for inserting and fixing the left and right rotary shafts (not shown) connected to the joint main bodies 110 and 120, respectively.
It is composed of a pair of yokes 112, 122 projecting from the diametrically opposed positions on the end face of the hub in the direction of the mating hub. The hubs 111 and 121 and the yokes 112 and 122 are integrally formed. Bearing holes 112a and 122a are formed in the yokes 112 and 122 so as to penetrate in the diameter direction, and sleeves 114 and 124 made of oilless metal are press-fitted into the bearing holes. And the pins 11 are attached to the sleeves 114 and 124.
3, 123 are provided so as to be slidably rotatable.

A rectangular column-shaped top 131 having a reduced angle is provided to form a connecting body of both joint bodies 111 and 121.
Pin holes 131 </ b> A for implanting the pins 113 and 123 by press fitting are formed on four side surfaces of 31.

In the case of universal joint assembly, the yoke 11 is first
The sleeve 11 is fitted in the bearing holes 112a and 122a of the two 122.
4 and 124 are press-fitted and fixed, and pins 113 and 123 are inserted into the sleeves 114 and 124 from the outside. Next, the top 131 is arranged between the pair of yokes 122 of the one hub 121, and the tips of the pins 123 passed through the sleeve 124 of the yoke 122 are aligned with the pin holes 131D on both sides thereof. Then, the pin 123 is pressed from the outside in the press machine, and the tip is press-fitted into the pin hole 131A of the top 131. Next, the top 131 connected to one hub 121 is connected to the other hub 111.
Between the pair of yokes 112, and the tip of the pin 113 passed through the sleeve 114 of the yoke 112 is pin hole 131.
In conformity with A, the pin 113 is pressed from the outside with a press machine and press-fitted. In this way, four pins 113, 123 are planted on the four side surfaces of the top 131, and at the same time, the pins 113, 1
The hubs 111 and 121 are mechanically connected to each other by the 23 and the top 131.

However, even with the above conventional structure, the number of parts is still large and the number of assembling steps cannot be reduced. Therefore, another universal joint shown in FIG. 4 has been proposed. That is, the joint body 2 in which the above-mentioned conventional yoke, sleeve and pin are integrated.
It is a universal joint constituted by 10, 220 and a pair of resin-made annular power transmission bodies 231, 241 for dynamically connecting both joint main bodies. One annular power transmission body 23
Four semi-elliptical notches (bearings) 231 on one end face of No. 1
a is formed, and 4 is formed on the outer peripheral surface of the transmission body 231.
The individual inclined protrusions 231b are formed in a protruding manner. The other annular equal force transmitter 241 has the four semi-oval cutouts 2
31a, four arcuate bearing portions 241a, and 4
Four fastener portions 241b that are elastically engaged with the individual inclined protrusions 231b are provided.

At the time of assembly, the pins 213A and 213B of the first joint main body 210 are aligned and mounted in the notches 231a of one annular power transmission body, for example, 231. Next, insert the pins 223A and 223B of the second joint body into the remaining notches 231a.
Align and attach to. Next, the other annular power member 241
The four fasteners 241b of the four inclined projections 231b
Assembly is completed by slidingly moving on the inclined surface of and engaging elastically.

[0007]

The conventional universal joint shown in FIG. 4 is superior to the configuration shown in FIG. 3 in that the number of parts is reduced, but on the other hand, a pair of annular joints is used. Until the power transmission members 231 and 241 are engaged with each other, the pins 213A, 213B, 223A, 223B and the notches 2
It is troublesome to maintain the temporary positional relationship with 31a, and as a result, the assembly work efficiency decreases. Further, since the pair of annular power transmission members 231 and 241 need to be formed with notches, protrusions, fasteners, etc., the appearance becomes complicated and there is a drawback that the manufacturing cost of the injection molding die for manufacturing them increases. is there.

Therefore, the present invention provides a universal joint which overcomes the above-mentioned conventional problems, has a small number of parts, has a simple shape of each part, can keep the manufacturing cost of parts low, and is easy to assemble. The purpose is to

[0009]

In order to achieve the above object, the present invention provides a first hub for fixing one end of one rotating shaft, and a diametrical direction of the first hub which is integrally provided on the first hub. A pair of firsts located on opposite sides and projecting radially outward
A first joint body having a turning pin; a second hub fixing one end of the other rotating shaft; and a second hub integrally provided on the second hub and located on the diametrically opposite side of the second hub and radially outward. A second joint body having a pair of second rotating pins projecting in one direction, and an annular power for rotatably supporting the pair of first rotating pins and second rotating pins to transmit power between both rotating shafts. A universal joint having a transmission member, wherein the annular power transmission member has a first elastic ring capable of expanding and contracting and having a fitting portion formed therein and a supporting portion for supporting the first and second rotating pins formed therein; There is provided a universal joint configured by a second elastic ring that is expandable and contractable and is fitted to an outer peripheral surface of the first elastic ring to reduce the diameter of the first elastic ring.

[0010]

According to the universal joint of the present invention having the above structure,
The diameter of the first elastic ring having a mating portion is expanded, and the first and second turning pins of the first and second joint bodies are incorporated in the bearing portion, respectively. Next, the assembly is completed by mounting the second elastic ring on the outer peripheral surface of the first elastic ring.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A universal joint according to one embodiment of the present invention will be described with reference to FIGS. Universal joint is the first joint body 1
0, the second joint body 20, and the annular power transmission body 30. The first joint body 10 is the first hub 1
1, a pair of yokes 12 and 12, and a pair of rotating pins 13
It is composed of A and 13B. The first hub 11 is formed with a shaft hole 11a that fits with one end of one rotating shaft (not shown), and also has a mating portion 11b.
A set screw (not shown) is provided in the vicinity of b so that it can be screwed. Therefore, one end of the rotary shaft can be attached to and detached from the shaft hole 11a of the first hub 11.

The pair of yokes 12, 12 are the first hub 1
The first hub 11 is provided so as to project in the axial direction from a surface opposite to the rotary shaft insertion side of the first hub 11, and is integrally provided with the hub 11 at a position on the diametrically opposite side of the first hub 11. Then, from the pair of yokes 12, 12, the pair of rotating pins 13A,
13B is radially outward of the hub 11 and the yoke 1
It is formed integrally with Nos. 2 and 12 by sintering, die casting, casting or the like. In addition, the pair of rotating pins 13A, 13
Bs are arranged on the same straight line.

The second joint body 20 which is connected to the other rotating shaft (not shown) has the same structure as the first joint body 10,
It has a hub 21, a pair of yokes 22 and 22, and a pair of second rotating pins 23A and 23B. The line X in FIG. 1 indicates the axis center when the two rotary shafts are aligned.

The annular power transmission body 30 transmits the rotational force of one rotating shaft (not shown) to the other rotating shaft so as to bring the first and second joint bodies 10 and 20 into a power connection relationship with each other. It is provided. The annular power transmission body 30 includes the pair of first rotating pins 13A and 13B and the second rotating pin 23.
It has a first elastic ring 31 for rotatably supporting A and 23B, and a second elastic ring 32 mounted on the outer peripheral surface of the first elastic ring 31.

The first elastic ring 31 is made of an elastic material such as metal or hard resin, and rotatably supports the mating portion 31a and the first and second rotating pins 13A, 13B, 23A and 23B. Through holes 31A, 31
B, 31C and 31D are formed. Abutment part 31a
1, the first elastic ring 31 can be expanded in the direction of arrow A in FIG. 1, and the first and second rotation pins 13A, 13B,
23A, 23B through holes 31A, 31B, 31 respectively
It is easy to install in C and 31D. Second elastic ring 3
2 is made of an elastic material and is composed of, for example, a stretchable endless rubber band. As shown in FIG. 2, the diameter of the second elastic ring 32 is expanded and fitted on the outer peripheral surface of the first elastic ring.

Explaining the universal joint assembly, the diameter of the first elastic ring 31 is increased in the direction of arrow A, and the first joint body 10
The pair of first rotation pins 13A and 13B are assembled in the through holes 31A and 31B, respectively. As a result, the first joint body 10 absorbs the parallel displacement of the rotating shaft as shown by the arrow B in FIG. Further, the pair of second rotating pins 23A and 23B of the second joint body 20 are respectively connected to the through holes 31C and
Installed in 31D. As a result, the second joint body 20 absorbs the angular displacement of the rotary shaft as shown by the arrow C in FIG. Next, as shown in FIG. 2, the second elastic ring 32 is mounted on the outer peripheral surface of the first elastic ring 31, and the assembly is completed. At this time, the mating portion 31a of the first elastic ring 31 is closed. The relative positional relationship between the first and second joint bodies 10 and 20 changes with respect to the first elastic ring 31 to function as a universal joint. The present invention is not limited to the above-described embodiments, and various modifications and improvements are possible within the scope of the technical matters described in the claims.

[0017]

According to the universal joint of the present invention described in detail above, the number of parts is remarkably reduced as compared with the conventional universal joint, and the respective joint bodies utilize the elastic deformation of the first elastic ring. Since the assembly is very simple assembling and mounting the second elastic ring on the first elastic ring, the assembly is simplified and simplified, and the number of assembling steps can be reduced. Further, since the annular power transmission body itself has a simple structure, it is not necessary to prepare a complicated mold, and the manufacturing cost can be reduced. Further, the material of the power transmission body is not limited to resin, and since the shape thereof is simple, there is a secondary effect that the size and material of the elastic ring can be easily changed according to the power transmission torque.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a universal joint according to an embodiment of the present invention.

FIG. 2 is a front view showing a power transmission body of a universal joint according to the present embodiment.

FIG. 3 is an exploded perspective view showing a conventional universal joint.

FIG. 4 is an exploded perspective view showing another conventional universal joint.

[Explanation of symbols]

 10, 20 Joint body 11, 21 Yoke 13A, 13B, 23A, 23B Rotating pin 31 First elastic ring 31A Abutment portion 32 Second elastic ring

Claims (1)

[Claims] 1. A first hub for fixing one end of one rotating shaft, and a pair of integrally provided on the first hub, located on the diametrically opposite side of the first hub and projecting outward in the radial direction. First
A first joint body having a rotating pin; a second hub fixing one end of the other rotating shaft; and a second hub integrally provided on the second hub and located on the diametrically opposite side of the second hub and radially outward. A second joint body having a pair of second rotating pins projecting in one direction, and an annular power for rotatably supporting the pair of first rotating pins and the second rotating pins to transmit power between both rotating shafts. A universal joint having a transmission member, wherein the annular power transmission member has a first elastic ring capable of expanding and contracting and having a mating portion formed therein and a bearing portion for supporting the first and second rotating pins formed therein; A universal joint, comprising: an elastic second elastic ring fitted to an outer peripheral surface of the first elastic ring to reduce the diameter of the first elastic ring.