JP2565952Y2 - Universal joint - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, two fork-like members are pivotally supported in opposition to a center connecting member by pivot pins respectively so as to be rotatable about orthogonal axes in the same plane.
With the axes of the fork members crossing in the same plane,
The present invention relates to a hook-type universal joint in which rotation of one fork-like member is transmitted to another fork-like member via a center connecting member.

[0002]

2. Description of the Related Art Conventionally, as a joint for connecting two shafts intersecting at a predetermined angle in the same plane so as to be able to transmit a rotational force, two fork-like members are respectively connected to a center connecting member by a pivot pin. There is a so-called hook-type universal joint which is rotatable about an axis orthogonal to a plane and pivotally supported in an opposed state. The center connecting member is formed in a cross shape in which the shafts cross each other in a cross shape, and a fork-like member is pivotally attached to each shaft end via a bearing so as to be swingable.

[0003]

However, the universal joint as described above has a complicated structure, a large number of parts, and is extremely troublesome to assemble. This problem is particularly remarkable when attempting to reduce the size, because the components become smaller.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a universal joint which can be constructed with a small number of parts, is easy to assemble, and is suitable for miniaturization.

[0005]

In order to achieve the above object, a universal joint according to the present invention comprises a center connecting member located between two fork-like members and a center connecting member provided between the yokes of the two fork-like members. And a pivot pin for pivoting to the vehicle. The pivot pin has a shaft portion and a head portion having a diameter larger than that of the shaft portion, and the shaft portion is connected to the center by penetrating the yoke and engaging with the center connecting member. While engaging with the member, the head is located at the outer peripheral portion of the yoke, a groove is formed in the head in a direction perpendicular to the axial direction of the pivot pin, and a fixing ring having elasticity is formed in the groove of the pivot pin. By mounting it, the pivot pin is held undetachably.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of the universal joint according to the present invention, and FIG. 2 is an exploded perspective view thereof. The illustrated universal joint 1 includes two spherically shaped center connecting members 2, each having two forked members 10, 10 of the same shape having a substantially U-shaped yoke 11.
0 is mounted on the outer surface so as to be swingable within a predetermined angle range. Yoke 11, 11 of fork-like member 10, 10
Are pivotally supported by a pivot pin 40 which covers the outer surface of the center connecting member 20 in a complementary manner and which cannot be dropped off by the fixing ring 30 so as to be able to swing within a predetermined angle range.

The center connecting member 20 has a spherical shape with a predetermined diameter as described above, and has four pin fitting holes 21 formed in the outer surface thereof. The pin fitting holes 21 are connected to the center connecting member 2.
In a plane including the center of 0, the holes are drilled in two orthogonal directions perpendicular to each other at a depth not communicating with each other. The fork-shaped member 10 is formed by extending a shaft portion 12 having a predetermined diameter and a predetermined length at the center of the outer surface of a substantially U-shaped yoke 11.

The yoke 11 has an inner surface 11A formed into a spherical shape capable of accommodating the center connecting member 20, and an outer surface 1A.
1B is formed as a spherical surface having a predetermined diameter. Through holes 11C, 11C passing through the center of the inner spherical portion are provided at both ends thereof.
Is formed, and the two yokes 11 are relatively centered on the through hole 11C in a state where the two yokes 11 face each other from opposite directions and cover the outer surface of the center connecting member 20 in a complementary manner. Are formed so as to be swingable within a predetermined angle range. Further, on the outer surface 11B, a groove 11E having a width and a depth into which a head 42 of a pivot pin 40 described later can be fitted is extended around the through hole 11C in a direction orthogonal to the extending direction of the yoke 11. ing.

In the pivot pin 40, a head 42 having a larger diameter and a predetermined thickness is formed integrally with one end of the shaft 41. The shaft portion 41 has a diameter that fits into the through hole 11 </ b> C of the yoke 11 and the pin fitting hole 21 of the center connecting member 20 with a predetermined tolerance allowing swinging thereof. On the outer surface of the head portion 41, a groove 42A having a width that allows the fixing ring 30 to be fitted in the radial direction and a predetermined depth is extended in the radial direction.
The fixing ring 30 is formed by forming a wire having spring properties, such as spring steel or stainless steel, into a discontinuous ring shape with one slit 31.
The yoke 11 has a spherical outer diameter substantially equal to that of the yoke 11.
In this embodiment, parts other than the pivot pin 40 and the fixing ring 30 are made of plastic.

The universal joint 1 is constructed by assembling the above-described components as follows. That is, the fork-like member 10 is arranged such that the through hole 11C of the yoke 11
At 1 while being extrapolated so as to cover the center connecting member 20,
The shaft portion 41 of the pivot pin 40 is inserted into the through hole 11C and the pin fitting hole 21 from the outer surface side of the yoke 11, whereby the fork-like member 10 is pivotally supported by the center connecting member 20 so as to swing by a predetermined angle. . Each pivot pin 40 has its head 42
Of the groove 42 </ b> A of the center connecting member 20 are aligned with (aligned with) the plane in which the pin fitting holes 21.
The fixing ring 30 is inserted into the groove 42A, and the pivot pin 40 is held by the fixing ring 30 so as not to fall off, and at the same time, the fixing ring 30 also becomes immovable. The fixing of the fixing ring 30 is made possible by elastic deformation due to the opening of the slit 31, and after being inserted, the fixing ring 30 is returned by elastic force to hold the pivot pin 40.

With the above configuration, the fork-like member 1
Reference numerals 0 and 10 denote axes orthogonal to each other in the same plane (the pivot pins 4).
0) around the center connecting member 20 so as to be able to swing around a predetermined angle range, and the rotation of one fork-shaped member 10 can be transmitted to the other fork-shaped member 10 via the center connecting member 20; By connecting the drive shaft and the driven shaft to the shaft portions 12, 12 of the fork-shaped members 10, 10, respectively,
The rotation can be transmitted from the drive shaft intersecting in the same plane to the driven shaft. As described above, the fork-like member 10 is pivotally supported on the center connecting member 20 by the insertion of the pivot pin 40 as described above, and the fixing ring 30 is elastically deformed so that the groove of the head 42 of the pivot pin 40. By inserting it into 42A, it can be easily performed.

In the above embodiment, the center connecting member 20 is made spherical and the fork-like member 10 is made spherical. However, the present invention is not limited to this. It is something. Also, pivot pin 4
Although the example of the groove 42A of the head 42 of 0 is shown as a single groove, the groove 42A may be a plurality of grooves, for example, by further adding a groove orthogonal to the groove 42A, so that assembling becomes easier.

[0013]

As described above, according to the universal joint according to the present invention, it can be configured with a small number of parts, does not require troublesome work such as screw tightening, and is easy to assemble and downsized. It is also suitable for.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Universal joint 10 ... Fork-shaped member 20 ... Center connection member 30 ... Fixing ring 40 ... Pivot pin 42A ... Groove

Continuation of the front page (56) References JP-A-2-35224 (JP, A) JP-A 63-73907 (JP, U) JP-A 2-12526 (JP, U) JP-A 61-105429 (JP , U) Fully open Hei 2-60718 (JP, U) Fully open sho 63-3524 (JP, U) Really open sho 64-57423 (JP, U) Really open sho 53-55049 (JP, U) Really open 51-157752 (JP, U) JP-B-59-7050 (JP, B2) Jiko-48-6100 (JP, Y1)

Claims (3)

(57) [Scope of request for utility model registration] 1. A fork-like member comprising a shaft and a yoke divided into two forks from an end edge of the shaft, wherein the two fork-like members are opposed to each other so that axes passing through the respective yokes cross each other. By holding each yoke rotatably around the axis,
A hook-shaped universal joint for transmitting rotation of one fork-like member to another fork-like member, comprising: a center connection member located between the two fork-like members; and a yoke of each of the two fork-like members. A pivot pin pivotally supported by the center connecting member, wherein the pivot pin has a shaft portion and a head portion having a larger diameter than the shaft portion, and the pivot pin is passed through the yoke. By engaging the center connecting member, the shaft portion is engaged with the center connecting member, and the head is located at the outer peripheral portion of the yoke, and the head is orthogonal to the axial direction of the pivot pin. A universal joint, wherein the pivot pin is held undetachably by forming a groove in a direction in which the pivot pin moves, and attaching an elastic fixing ring to the groove of the pivot pin. 2. The universal joint according to claim 1, wherein said yoke has a substantially spherical shape while being pivotally supported by said center connecting member. 3. The universal joint according to claim 1, wherein the center connecting member is formed in a substantially spherical shape.