JPH0743499Y2 - Universal joint - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> This invention relates to a universal joint.

<Prior Art> Conventionally, this type of universal joint has a Y-shaped joint formed by extending in a bifurcated manner at the tip of the base to form pin holes at the tips of the forks, respectively. Position the forks of the so that they are connected by rotating them by 90 °. On the other hand, a cube-shaped intermediate joint is held inside the Y-shaped joint, and pin holes are formed to penetrate through the outer peripheral surface of the intermediate joint in an orthogonal state. Then, one long shaft-shaped pin is passed through the pin hole of one fork portion of one Y-shaped joint to the pin hole of the other fork portion, thereby making the Y-shaped joint an intermediate joint. Lock it swingably. A through hole is formed in the central portion of the long-axis pin.

Next, after inserting two short shaft-shaped pins having hollow insides from both pin holes of the fork portion of the other Y-shaped joint, caulking pins are inserted from the hollow portion of the short shaft-shaped pins to the above-mentioned long shaft-shaped pins. Through the through hole of the pin to communicate with the other short-axis pin, so that the other Y-shaped joint is also swingably locked to the intermediate joint.

<Problems to be solved by the invention> However, in the universal joint as described above, since the diameter of the pin connecting the Y-shaped joints is thin at the orthogonal portion of the pin, the pin may be repeatedly rotated and stopped. There was a problem that the thin part would break due to stress on the.

Moreover, since the intermediate joint and the pin have a divided structure,
The inner diameter of the pin hole of the intermediate joint is usually set to be slightly larger than the outer diameter of the pin in consideration of accuracy error and assemblability. There is also a problem that the pin comes into contact with the inner edge of the pin hole of the intermediate joint, receives stress, and is easily damaged.

On the other hand, in order to improve the strength, the diameter of the pin may be increased, but this causes a new problem that the entire joint becomes large.

The present invention has been made in view of the above-described circumstances, and an object thereof is to smoothly transmit torque without causing pin breakage even if rotation and stop are repeated and without increasing the size of the entire joint. To provide universal joints that can

<< Means for Solving the Problems >> In order to achieve the above object, in the universal joint according to the present invention, a set of Y-shaped joints having a pair of fork portions extending in a bifurcated shape at the tip of the base portion, In a universal joint consisting of an intermediate joint held inside the fork of each Y-shaped joint,
The mold joint includes first and second joint constructs formed by dividing the base portion to have the fork portions, and a ring body for joining and fixing the first and second joint constructs. A pin portion is integrally formed on the outer peripheral surface of the intermediate joint so that the Y-shaped joint can be swingably locked.

<< Operation >> One of the opposing pin portions of the intermediate joint in which the pin portions are integrally formed on the four outer peripheral surfaces is inserted into the pin hole formed in the fork portion of the first joint structure. Next, the other pin portion is inserted into the pin hole of the second joint structure.

After that, a ring body is attached to the outer circumference of each base of the joined first and second joint components, and the first and second joint components are joined and fixed.

<< Embodiment >> A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a universal joint according to the present invention. This universal joint includes an intermediate joint 1 and a set of Y-shaped joints 2,
It consists of 2.

That is, the intermediate joint 1 has a substantially cubic shape, and the pin portions are provided at the central portions of the four side peripheral surfaces of the intermediate joint 1.
5a, 5b, 5c, 5d are integrally formed with the intermediate joint 1 so as to project. A groove 6 is formed on the outer circumference of the tip of each pin.

A C-shaped stop ring 7 for preventing slipping out can be fitted into the groove 6 at one position.

On the other hand, the Y-shaped joint 2 is divided into a first joint structure 8 having one fork part 8a and a second joint structure 9 having a substantially L-shaped cross section and the other fork part 9a. And the first joint structure 8
And the second joint structure 9 are divided on the same plane as the inner surface of the fork part 8a of the first joint structure 8, that is, the first joint structure 8 is divided into the inner surface of the fork part 8a and the base part. The inner surface of 8b is flush. A cylindrical space 10 is formed at the bottom of the base 9b of the second joint structure 9, and a drive (driven) shaft for transmitting a rotational force is connected thereto.

Further, the height of the fork portions 8a, 9a of the Y-shaped joint 2 is formed to be slightly larger than the length of one side of the intermediate joint 1. And each Y-type joint 2 is fork part
8a and 9a are connected so as to face each other via the intermediate block 1. Further, pin holes 8c and 9c through which the pin portions 5a to 5d can be inserted are formed at the centers of the tip ends of the fork portions 8a and 9a.

The first and second joint components 8 and 9 are joined and fixed by a ring body 12. The ring body 12 has a hollow cylindrical shape and its inner diameter is the first joint. The structure 8 and the second joint structure 9 are formed to have substantially the same outer diameter as that of the Y-shaped joint 2 in a joined state, and the length thereof is formed to be equal to the height of the base portions 8b and 9b of the Y-shaped joint 2. .

It should be noted that the joint body 8 and 9 and the ring body 12 have Y
A mold joint 2 is constructed.

In the above structure, after inserting the pin portion 5a of the intermediate joint 1 from the inside of the pin hole 8c of the first joint structure 8 of the one Y-type joint 2, the pin is inserted from the outside of the pin hole 8c. When the stop ring 7 is fitted in the groove 6 of the portion 5a, the pin portion 5a is prevented from coming out of the pin hole 8c. Similarly, the pin hole of the second joint structure 9
After inserting the protrusion 5c into the 9c, the first joint structure 8,
With the divided surfaces of the bases 8b and 9b of the second joint structure 9 joined to each other, the ring body 12 is press-fitted and fixed from the bottom. As a result, the intermediate joint 1 has the fork portions of the first joint structure 8 and the second joint structure 9.
It will be held inside 8a and 9a.

The first joint structure 8 of the other Y-shaped joint 2 is rotated 90 ° from above the intermediate joint 1 with the fork portions 8a, 9a of the one Y-shaped joint 2 to form the first joint structure. The fork portion 8a of 8 is positioned so as to be connected, the pin portion 5b of the intermediate joint 1 is inserted from the inside of the pin hole 8c, and the stop ring 7 is fitted from the outside. Similarly, the pin hole 9c of the second joint structure 9
After inserting the pin portion 5d into the
With the split surfaces of 9b joined to each other, the ring body 12 is press-fitted and fixed from the bottom. This allows the intermediate joint 1
Will be held inside each Y-joint 2. In this way, by making each Y-joint 2 rotatable about the axes of the pin portions 5a to 5d of the intermediate joint 1, universal rotation is achieved and torque is transmitted.

In this embodiment, the joints 8 and 9 of the Y-shaped joint 2 are fixed by press-fitting the ring body 12. However, the joints 8 and 9 are fixed by welding while the ring body 12 is still attached. You may do it.

Further, the shape of each of the joints 8 and 9 may be divided into two at the central portion of the Y-shaped joint to form two joint structures having a substantially L-shaped cross section. However, in this case, a semi-cylindrical space is formed at the bottom of each joint, and the shaft is connected to this space.

<Effect of the Invention> As described above, according to the universal joint of the present invention, the pin portion is integrally formed on the outer peripheral surface of the intermediate joint, and therefore, even if rotation and stop are repeated, the pin can be formed like the conventional one. Since there is no thin part of the shaft, the problem that the pin breaks can be solved. Further, the rattling of the connecting portion is reduced, and the torque can be transmitted smoothly. Therefore, it is possible to provide a small-sized universal joint excellent in strength.

[Brief description of drawings]

FIG. 1 is a perspective view of a universal joint according to the present invention, and FIG. 2 is an exploded perspective view thereof. 1 …… Intermediate joint 2 …… Y type joint 5a, 5b, 5c, 5d …… Pin part 8 …… First joint structure 9 …… Second joint structure 8b, 9b …… Base 8a, 9a… … Fork part 12 …… Ring body

Claims (1)

[Scope of utility model registration request] 1. A universal consisting of a pair of Y-shaped joints having a pair of fork portions extending in a bifurcated shape at the tip of the base portion, and an intermediate joint held inside the fork portions of each Y-shaped joint. In the joint, each of the Y-shaped joints includes a first joint structure and a second joint structure in which the base portion is divided to have the fork portions, respectively.
A ring body for joining and fixing the first and second joint constituent bodies is provided, and a pin portion for integrally swingably locking the Y-shaped joint is integrally provided on an outer peripheral surface of the intermediate joint. Universal joint that is characterized by being formed in a uniform manner.