JPH0687733U - Universal joint - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a universal joint that is easy to assemble, has a small number of parts, and has a simplified part shape. [Structure] A pair of turning pins 13A 13 protruding outward in the radial direction of the hubs 11 and 21 for fixing the rotating shafts.
B, 23A 23B are integrally formed to provide the first and second joint bodies 10, 20. The annular power transmission body 30 is formed of an elastically deformable resin, and four guide grooves 3 are formed on the inner peripheral surface thereof, one end of which opens to one end surface of the power transmission body and engages with the pin.
0a, 30a, 30a ', 30a' and four blind holes communicating therewith are formed. [Effect] The rotating pin can be easily incorporated into the power transmission body, and the shape of the transmission body is also simplified, so that the assembly can be facilitated and the manufacturing cost of parts can be suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a universal joint, and more particularly to a universal joint that has a small number of parts, is easy to assemble, and has a simple part shape.

[0002]

[Prior 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. 4, the pair of left and right joint bodies 110 and 120 are diametrically opposed to the hubs 111 and 121 for inserting and fixing the left and right rotating shafts (not shown) connected to them. It is composed of a pair of yokes 112 and 122 projecting in the direction of the hub from the opposite side. 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 diametrical direction. Oilesleeve sleeves 114 and 124 are press-fitted into the bearing holes. Pins 113 and 123 are slidably and rotatably provided on the sleeves 114 and 124, respectively.

A rectangular column-shaped top 131 with a reduced angle is provided to form a connecting body of both joint bodies 111 and 121. Pins 131 and 123 are formed on the four side surfaces of the top 131 by press-fitting to insert pin holes 131A. Has been drilled.

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

However, even with the above conventional configuration, the number of parts is still large and the number of assembling steps cannot be reduced. Therefore, another universal joint shown in FIG. 5 has been proposed. That is, it is constituted by the joint main bodies 210 and 220 in which the above-mentioned conventional yoke, sleeve and pin are integrated, and a pair of resin-made annular power transmission bodies 231 and 241 for mechanically connecting both joint main bodies. It is a universal joint. Four semi-elliptical notches (bearings) 231a are formed on one end surface of one annular power transmission body 231, and four inclined projections 231b are provided on the outer peripheral surface of the transmission body 231. Has been formed. On the other hand, the other annular force transmitting member 241 has four arc-shaped bearing portions 241a facing the four semi-elliptical notches 231a, and elastically engages with the four inclined projections 231b. Individual fastener parts 241b are provided.

At the time of assembly, the pins 213A and 213B of the first joint main body 210 are aligned and attached to the notches 231a of the one annular power transmission body 231. Next, the pins 223A and 223B of the second joint body are aligned and attached to the remaining notches 231a. Next, the four fastener portions 241b of the other annular power member 241 are slidably moved on the inclined surfaces of the four inclined projections 231b to be elastically engaged with each other to complete the assembly.

[0007]

[Problems to be solved by the device]

 The conventional universal joint shown in FIG. 5 is superior to the configuration shown in FIG. 4 in that the number of parts is reduced, but on the other hand, the pair of annular power transmission members 231 and 241 are connected to each other. Until the engagement, it is troublesome to maintain the temporary positional relationship between the pins 213A, 213B, 223A, 223B and the notch 231a, which reduces the assembly work efficiency. Further, since the pair of annular power transmission members 231 and 241 need to have notches, protrusions, fasteners, etc., the appearance becomes complicated and the manufacturing cost of the injection mold for manufacturing them increases. is there.

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

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a first hub that fixes one end of one rotating shaft, and a first hub that is integrally formed with the first hub and that is located on a diametrically opposite side of the first hub and is radially outward. A first joint body having a pair of first rotating pins projecting in one direction, a second hub fixing one end of the other rotating shaft, and a second hub integrally formed with the second hub and diametrically opposite to each other. A second joint main body having a pair of second pivoting pins located on the side and projecting outward in the radial direction, and a pair of first pivoting pins and second pivoting pins rotatably supported on both rotary shafts. In a universal joint having an annular power transmission body for transmitting power between them, four guides that extend axially on the inner peripheral surface of the annular power transmission body and are in sliding contact with the pair of first and second rotation pins during assembly. The pair of first and second rotating pins are rotatably supported by communicating with the groove and the inner end portion of the guide groove. A hole is formed, one end of one set of guide grooves located on the diametrically opposite side of the guide groove is open to one end face of the annular power transmission body, and one end of the other set of guide grooves. Provides a universal joint having an opening at the other end surface of the annular power transmission body.

As a preferred embodiment, the annular power transmission body is formed of an elastically deformable elastic material, and the first and second rotation pins are press-fitted into the four guide grooves.

In another preferred embodiment, the annular transmission body is formed of a material having high rigidity, and a rear end portion of the guide groove is further formed with a bent groove portion bent in the circumferential direction of the annular transmission body. The blind hole communicates with the bent portion.

[0012]

According to the universal joint of the present invention having the above structure, the first joint body is inserted into the set of guide grooves and slidably moved to the blind hole, so that the first joint body moves with respect to the annular power transmission body. It is rotatably connected. Further, the second joint body is rotatably connected to the annular power transmission body by inserting the second pivot pin into another set of guide grooves and slidingly moving it to the blind hole.

According to a preferred aspect, the annular power transmission body is formed of an elastic material, and the first and second rotation pins are press-fitted to the four guide grooves, so that the rotation pins are After the rotatably supported in the blind hole, the guide groove recovers the original groove width, so that the rotation pin cannot pass through the guide groove naturally, and the rotation pin is prevented from coming off.

According to another preferred embodiment, since the annular transmission body is formed of a material having high rigidity, elastic deformation of the guide groove itself does not occur, but the inner end portion of the guide groove has a peripheral portion of the annular transmission body. Since the bending groove portion that is bent in the direction is further formed to have a key shape or a crank shape, the rotation pin cannot naturally pass through the guide groove and the rotation pin is prevented from coming off.

[0015]

【Example】

 A universal joint according to a first embodiment of the present invention will be described with reference to FIG. The universal joint includes a first joint body 10, a second joint body 20, and an annular power transmission body 30. The first joint body 10 is composed of a first hub 11, a pair of yokes 12 and 12, and a pair of rotating pins 13A and 13B. The first hub 11 is formed with a shaft hole 11a that fits with one end of one of the rotating shafts (not shown), and an abutment portion 11b. A set screw (not shown) is screwed in the vicinity of the abutment portion 11b. It is possible. Therefore, one end of the rotary shaft can be attached to and detached from the shaft hole 11 a of the first hub 11.

The pair of yokes 12, 12 are provided so as to project in the axial direction of the first hub 11 from the surface of the first hub 11 on the side opposite to the rotary shaft insertion side, and the diameter direction of the first hub 11 It is provided integrally with the hub 11 at the opposite side. Then, from the pair of yokes 12, 12, the pair of rotating pins 13A, 13B are projected outward in the radial direction of the hub 11 and integrally with the yokes 12, 12 by sintering, die casting, casting or the like. Has been formed. The pair of rotating pins 13A and 13B are arranged on the same straight line.

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

The annular power transmission body 30 transmits the rotational force of one rotation shaft (not shown) to the other rotation 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 is made of an elastic material, for example, an elastically deformable resin. The annular power transmission body 30 has blind holes 30b, 30b 'for rotatably supporting the pair of first rotating pins 13A, 13B and second rotating pins 23A, 23B, and the blind holes 30b, 30b. Communication grooves (guide grooves) 30a, 30a 'communicating with the blind hole 30b30b' for guiding the turning pin are formed on the inner peripheral surface side.

In detail, the pair of communication grooves 30a and the blind hole 30b are respectively located on the diametrically opposite sides, and one end of the communication groove 30a is open to one end surface of the annular power transmission body 30. The other end of the communication groove 30a communicates with the blind hole 30b, and the blind hole 30b supports the pair of rotating pins 13A and 13B. The other pair of communication grooves 30a 'and the blind hole 30b' are respectively located on the diametrically opposite sides, and one end of the communication groove 30a 'is opened to the other end surface of the annular power transmission body 30. The other end of the communication groove 30a 'communicates with the blind hole 30b', and the blind hole 30b 'supports the pair of rotating pins 23A and 23B. These communication grooves 30a, 30a 'extend in the axial direction of the annular power transmission body 30, and the groove width is formed slightly smaller than the diameter of the rotating pins 13A, 13B, 23A, 23B. The diameter of the blind hole is slightly larger than the diameter of the rotating pin.

Assembly of the universal joint will be described. When the pair of first rotating pins 13A and 13B of the first joint body 10 are pressed against the openings of the pair of communication grooves 30a, the annular power transmission body 30 is elastically deformed to increase the groove width. The rotating pins 13A and 13B are pressed into the groove 30a and move. When the first rotation pins 13A and 13B reach the blind hole 30b, the first rotation pin is rotatably mounted in the blind hole 30b. Therefore, the communication groove 30a recovers the original groove width by elasticity, and the first rotating pin does not drop from the annular power transmission body 30. As a result, the first joint body 10 absorbs the parallel displacement of the rotating shaft as shown by the arrow A in FIG. Similarly, the pair of second rotating pins 23A and 23B of the second joint body 20 are also inserted into the blind holes 30b 'after passing through the communication grooves 30a' from positions opposite to the above. As a result, the second joint main body 20 absorbs the angular displacement of the rotating shaft as shown by the arrow B direction in FIG. Therefore, the rotational position of the first and second joint bodies 10 and 20 with respect to the annular power transmission body 30 changes the relative positional relationship between the first and second joint bodies to function as a universal joint. To do.

Next, a universal joint according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment is an example in which the annular power transmission body 30 of the first embodiment is made of a highly rigid material such as metal, and the joint body is the same as that of the first embodiment. FIG. 2 shows an annular power transmission body 40 according to the second embodiment, in which a pair of communication grooves 40a and another pair of communication grooves 40a 'are formed at the same positions as those of the first embodiment. The end portion on the back side is formed with retaining grooves 40b and 40b 'which are bent in the circumferential direction of the annular power coupling body, and the blind holes 40c and 40c' are formed in communication with these retaining grooves 40b and 40b '. Has been done. The pair of retaining grooves 40b, 40b extend in the same circumferential direction, and the other pair of retaining grooves 40b ', 40b' also extend in the same circumferential direction. Further, the groove widths of the communication groove and the retaining groove are formed to be slightly larger than the diameters of the rotating pins 13A, 13B, 23A and 23B.

Explaining the assembly of such a universal joint, the pair of first rotation pins 13A and 13B of the first joint body 10 are slid into the communication groove 40a from the openings of the pair of communication grooves 40a, respectively. Next, when the annular power transmission body 40 and the first joint body 10 are relatively rotated, the first rotation pins 13A and 13B pass through the retaining groove 40b and reach the blind hole 40c. Therefore, the first rotation pins 13A and 13B are rotatably supported by the annular power transmission body 40. Next, as for the second turning pins 23A and 23B of the second joint body 20, the remaining pair of communication grooves 40a 'and the retaining grooves 40b' are passed through and the assembling is completed in the blind hole 40c '. To do. In the second embodiment, the passage for guiding the turning pin to the blind hole is formed into a hook shape by the communication groove and the retaining groove to prevent the turning pin from coming off the annular power transmission body.

Further, instead of the hook-shaped guide groove (prevention groove) of the second embodiment, as a modification of the second embodiment, as shown in FIG. 3, the inner peripheral surface of the metallic annular power transmission body 50 is shown. It is also possible to form a crank-shaped retaining groove formed by continuously forming the axial groove 50a, the circumferential groove 50b, the axial groove 50c, and the circumferential groove 50d to reach the blind hole 50e. With such a crank-shaped retaining groove, the effect of preventing the turning pin from coming off can be further enhanced.

The present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the technical matters described in the scope of claims for utility model registration.

[0025]

[Effect of device]

 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 each joint body can be easily assembled to the annular power transmission body. It is possible to reduce the number of assembly steps. 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.

[Brief description of drawings]

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

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

FIG. 3 is a partial perspective view showing a modified example of the power transmission body of the second embodiment.

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

FIG. 5 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 30, 40 Annular power transmission body 30a, 30a ', 40a, 40a' Communication groove 40b, 40b 'retaining groove 50a, 50b , 50c, 50d retaining groove 30b, 30b ', 40c, 40c', 50e blind hole

Claims (3)

[Scope of utility model registration request] 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. In a universal joint having a transmission body, the annular power transmission body has an inner peripheral surface having four guide grooves extending in the axial direction and in sliding contact with the pair of first and second rotation pins, and the inner side of the guide groove. A blind hole that communicates with the side end portion and rotatably supports the pair of first and second rotating pins is formed, and a pair of guide grooves located on the diametrically opposite side of the guide groove is formed. One end is open to one end surface of the annular power transmission body, and one end of the other set of guide grooves is to the other end surface of the annular power transmission body. Universal joint, characterized in that it is the mouth. 2. The annular power transmission body is formed of an elastically deformable elastic material, and the first and second rotation pins are press-fitted into the four guide grooves. The universal joint according to claim 1. 3. The annular transmission body is formed of a material having high rigidity, a rear end portion of the guide groove is further formed with a bent groove portion bent in the circumferential direction of the annular transmission body, and the blind hole is formed by the bending hole. The universal joint according to claim 1, wherein the universal joint communicates with the portion.