JPH0238093Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a power transmission joint that connects an air cylinder or a hydraulic cylinder and a driven body operated by these cylinders.

[Background Art] The direction of motion of the driven body operated by an air cylinder or hydraulic cylinder must be aligned with the axial direction in which the piston rod of each cylinder moves. Otherwise, stick slip may occur during low-speed operation, or the stroke may be distorted. The piston rod will not move smoothly, such as not being able to push it all the way or return it all the way.

Also, if the above two directions do not match and the operation continues,
The piston rod becomes bent or galled, resulting in uneven wear of the rod packing and piston packing, which causes fluid leakage and shortens the life of the cylinder.

Therefore, the work of installing cylinders and the like for the above-mentioned axis alignment becomes troublesome and takes a lot of time.
In other words, it is difficult to control the precision of axis alignment, which is disadvantageous in terms of workability and economy.

On the other hand, power transmission joints that can hinge the cylinder and driven body are widely used today in order to significantly reduce the number of man-hours required for tedious machining, assembly, and adjustment to eliminate the above-mentioned mismatch between the shaft centers. It is becoming more and more popular.

FIG. 1 shows a conventional example of such a power transmission joint.

First, to describe this, reference numeral 1 is a cylindrical case having a side wall, and a stud shaft 4 containing a spherical body 3 accommodated in the case 1 is inserted into a through hole 2 provided in the side wall of the case 1.

Reference numeral 5 denotes a stud bolt that is continuous with the stud shaft 4 and is used to connect a shaft of a moving body, etc., and a nut 6 is screwed into this stud bolt 5. The spherical body 3, stud shaft 4, and stud bolt 5 are integrally formed to constitute a stud body.

Reference numeral 7 denotes a flange that projects integrally with the stud shaft 4. A rubber cap-shaped dust cover 8 is fitted onto the stud shaft 4 so as to be prevented from coming off by the flange 7. The peripheral portion covers the area around the through hole 2.

Rings 9 and 10 slide and support the spherical body 3 from two opposing locations, and are in contact with the spherical body 3 at arcuate contact surfaces 9a and 10a of a certain width.

Reference numeral 11 denotes a socket into which the end of the piston rod on the cylinder side is screwed, the tip of which is screwed into the case 1, and the end surface of the tip presses the ring 10 in the direction of the stud ball 3. The pressing force is such that each ring 9, 10 can slide on the inner surface of the side wall of the case 1 and the end surface of the tip end of the socket 11. 12 is case 1 and socket 11
This is a pin that fixes the

In such a power transmission joint, the stud bolt 5
By connecting the driven body to the stud bolt 5 and the piston rod on the cylinder side to the socket 11, even if the moving direction of the driven body deviates by a predetermined angle from the axial direction in which the piston rod moves, the stud bolt 5 By tilting the axial direction of the case 1 with respect to the axial direction of the case 1, it is possible to absorb uneven forces acting on each piston rod or driven body due to the misalignment.

In addition, if the axial direction in which the piston rod moves is equal to the direction in which the driven body moves, and if a deviation occurs in each axial center position, the rings 9 and 10 should be slid against the inner surface of the case side wall and the socket end surface. By this, the stud bolt 5 can be displaced with respect to the case 1, and the uneven force acting on the piston rod or the driven body due to the above-mentioned displacement can be absorbed.

In other words, even if the axial direction or axial center position of the piston rod and the driven body deviate, by connecting them with a power transmission joint, the linked operation can be carried out smoothly, and the bending of the piston rod as in the conventional case can be avoided. It can effectively prevent uneven wear of various packings.

However, such conventional power transmission joints have problems in terms of installation and installation space, such as the inability to connect cylinders and driven bodies that are close to each other due to their large overall axial length. Ta.

Further, as other power transmission joints, for example, there is one described in Japanese Utility Model Publication No. 51-38099.

That is, other power transmission joints include a spherical hollow body provided at the end of a rack shaft and a spherical body provided at the end of a stud shaft, and the sliding contact between the spherical body and the hollow body enables the easy transmission. The stud shaft can be swingably connected to the shaft.

However, when the above-mentioned other power transmission joints are applied to the piston rod of the cylinder and the joint of the driven body, not only does the axial length of the connecting portion become large, but it also makes it difficult to swing the driven body relative to the piston rod. However, if the axes of the piston rod and the driven body are misaligned, it is impossible to align the axes, so there is a problem that the two cannot be connected.

Furthermore, other power transmission joints include those described in Japanese Patent Publication No. 49-10781.

In other words, other power transmission joints have a double spherical joint structure with inner and outer concentricity that allows only rocking, and consists of a hemispherical hollow body provided at the end of the ball stud and a hemispherical hollow body provided on the socket side. It is equipped with an insert and a hemispherical body, and the hemispherical hollow body is slidably held between the insert and the hemisphere so that the driven body on the ball stud side can swing freely relative to the movable body on the socket side. This allows them to be connected.

However, with the other power transmission joints mentioned above, even if the axial length of the connecting part is halved and the driven body can be swung relative to the moving body, the axes of the moving body and the driven body are misaligned. In this case, there was a problem in that the two could not be connected because the axes could not be aligned.

[Purpose of invention]

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a power transmission joint that can be downsized by shortening the axial length of the connecting portion.

Another object of the present invention is to provide a power transmission joint that can align the axes of the moving body on the socket side and the driven body on the stud body side.

[Structure of the idea]

The power transmission joint of the present invention includes a stud body whose one end is rotatably and movably supported in a case, and a socket connected to the case on the opposite side of the stud body. In the case, a ring having an arcuate contact surface or a conical contact surface and a ball base having a hemispherical or conical surface are attached to the side wall of the case and the end surface of the socket, respectively, in a direction perpendicular to the axial direction. A hemispherical member that is slidably provided and protrudes from the one end of the stud body is oscillated between the arcuate contact surface or conical contact surface of the ring and the hemispherical surface portion or conical surface portion of the ball base. It has a structure in which it can be slid and held.

[Example 1] Fig. 2 shows an embodiment of the power transmission joint of the present invention, and the same components as those shown in Fig. 1 are denoted by the same reference numerals, and redundant explanations are omitted. Omitted.

In FIG. 2, reference numeral 13 designates a ball base integrally having a hemispherical surface portion 13a and a flat plate portion 13b, and the flat surface of the flat plate portion 13b is adapted to be slidably abutted on the end surface of the socket 11. Further, the center portion of the hemispherical portion 13a faces the stud side.

Further, a hemispherical member 14 is integrally connected to the stud shaft 4 end of the stud body, and this hemispherical member 1
The stud side of 4 is the arcuate contact surface 9a of the ring 9.
The arcuate surface 14a is in surface contact with the surface.
Therefore, the arcuate surface 14a can slide smoothly within a certain range with respect to the arcuate contact surface 9a.

Further, the socket side of the hemispherical member 14 is basically a surface parallel to the plane of the flat plate portion 13b, but a hemispherical surface portion 14b is recessed in the center, and this hemispherical surface portion 14b is a surface parallel to the plane of the flat plate portion 13b. It is slidably fitted into the hemispherical surface portion 13a of No. 13.

Note that the ring 9, hemispherical member 14, and ball base 13 are inside the case 1, and the socket 1
1 is pressed and held with a constant force, so that each of the above-mentioned sliding movements can be performed smoothly.

Reference numeral 15 indicates a hole formed when forming the hemispherical portion 14b, and 16 indicates a notch provided to facilitate molding of the hemispherical portion 13a.

In a power transmission joint having such a configuration, even if the axial direction of the stud bolt 5 of the stud body and the axial center of the socket 11, and furthermore the axial direction of the piston rod of the cylinder that is threadedly connected to the socket 11, are misaligned, By fitting and sliding the hemispherical portions 14b and 13a, the movement of the piston rod connected thereto can be transmitted to the driven body without difficulty.

Furthermore, even if the axial direction of the stud bolt 5 and the axial direction of the socket 11 are aligned, if these axial center positions are misaligned, the ring 9 may be attached to the case 1.
flat plate part 1 of the ball base 13.
3b also slides on the end face of the socket 11,
By correcting this deviation and aligning the axes of the piston rod and the driven body, their linked operations can be made smoother.

[Embodiment 2] FIG. 3 shows another embodiment of the present invention.

Embodiment 2 is different from Embodiment 1 shown in FIG.
c.

By providing this conical surface portion 14c, the hemispherical surface portion 13a comes into line contact with the conical surface portion 14c, and the contact resistance therebetween is reduced. Thus, there is an advantage that sliding between them becomes easier. Further, the conical surface portion 14c is larger than the hemispherical surface portion 1.
It is easier to mold than 4b, and the processing accuracy is stable.

In addition, 17 is a machined hole made when forming the above-mentioned conical surface part 14c.

Even in the power transmission joint of this embodiment, the same function as in the above embodiment is achieved.
In addition to enabling smooth stroke motion of the driven body by the cylinder, the life of the cylinder can be extended.

The advantages common to both Embodiments 1 and 2 are that a hemispherical member 14 is provided at the stud end, and a hemispherical surface is formed at the end of the stud, whereas in the conventional case a large spherical body 3 is provided at the stud end. By slidably inserting the hemispherical surface portion 13a of the ball base 13, which can slide on the end surface of the socket 11, into the conical surface portion 14b or the conical surface portion 14c, the axial distance between the side wall of the case 1 and the end surface of the socket 11 can be greatly reduced. It is something that can be reduced. In other words, the axial length of this joint can be shortened compared to conventional products without impairing its function as a power transmission joint, and the hinge connection between the piston rod on the cylinder side and the driven body, which are arranged close to each other, can be made. It is extremely effective when used. Note that, unlike the above-mentioned embodiments, it is also practically possible to connect the piston rod on the cylinder side to the stud bolt 5 and to connect the driven body to the socket 11.

[Effects] As explained above, according to the power transmission joint of the present invention, the case includes a ring having an arcuate contact surface or a conical contact surface and a ball base having a hemispherical or conical surface. is provided on the side wall of the case and the end face of the socket so as to be slidable in the direction perpendicular to the axial direction, respectively, and a hemispherical member protruding from one end of the stud body is connected to the arc-shaped contact surface or conical contact surface of the ring and the above-mentioned Since the structure is such that it is slidably sandwiched between the hemispherical surface or conical surface of the ball base, the axial length of the connecting portion is halved to reduce the size of the ball base, making it easier for moving objects on the socket side. Not only can the driven body on the stud body side be swung, but it also has the function of aligning the axes of the moving body and the driven body when their axes are misaligned.
This allows the two to be easily connected.

In addition, the number of man-hours required for processing and assembly is small, resulting in effects such as lower cost as a product.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional power transmission joint, Figure 2 is a sectional view of a conventional power transmission joint.
The figure is a cross-sectional view showing one embodiment of the power transmission joint of the present invention, and FIG. 3 is a cross-sectional view showing another embodiment of the present invention. 1...Case, 5...Stud bolt, 9...
Ring, 11... Socket, 13... Ball base, 13a... Hemispherical part, 14... Hemispherical member, 1
4a...Circular surface, 14b...Semispherical surface part, 14c...
...Conical surface part.

Claims (1)

[Scope of utility model registration request] A power transmission joint having a stud body whose one end is rotatably and movably supported in a case, and a socket connected to the case on the opposite side of the stud body, in which an arc-shaped stud body is provided in the case. A ring with a contact surface or a conical contact surface and a ball base with a hemispherical surface or a conical surface are
A hemispherical member is provided on the side wall of the case and the end face of the socket so as to be slidable in a direction perpendicular to the axial direction, and protrudes from the one end of the stud body, and is connected to the arcuate contact surface or the conical contact surface of the ring. and the hemispherical surface portion or the conical surface portion of the ball base, the joint for power transmission being slidably held in a swingable manner.