JPS5821940Y2 - Fixing device for universal joint and shaft - Google Patents

Description

[Detailed description of the invention] This invention relates to a fixing device for a mating rotating shaft, and more specifically, when taking an example of a fixing device between a universal joint and a shaft, the device is attached to a hole drilled in the axial direction of the body of a universal joint. This invention relates to a fixing device for a universal joint and a shaft, which is a type of device in which the inner end of a driving shaft or a driven shaft is inserted and both the body of the universal joint and the shaft are fixed with a pin orthogonal to the axial direction.

The hardened body of the universal joint is aligned with the holes for inserting a pair of upper and lower fixing pins that extend in a straight line perpendicular to the axial direction, and the shaft is inserted into the hole for an accurate series of penetrations. Drilling a hole is most desirable when fixing a joint and a shaft with a pin, but precise drilling of this shaft is extremely difficult and requires a high degree of skill.

For example, place the body of the joint on a triangular stand, position a pair of upper and lower holes previously drilled in the body of the joint directly below a drill set vertically, and then insert the drill into the hole in the body of the joint. Although drilling work is performed on the shaft, the hole drilled in the shaft is almost exactly aligned and communicates with the upper hole of the joint body at the initial stage of work, but at the connection part with the lower hole of the joint body. There is a slight amount of looseness (error), and it is very difficult to obtain a series of communicating holes that match exactly, so it is extremely difficult to fit a single fixing pin tightly into the communicating holes. It was difficult.

In view of these circumstances, this invention was designed to allow easy fixation of the joint body and shaft, without making the error between the through hole drilled in the shaft and the lower hole of the joint body a major problem. The purpose is to provide a fixing device that makes it possible to fix the pin, in which a single pin is fitted into a series of communicating holes, and a spring is attached to the head, which is the part with the largest diameter that fits tightly into the communicating holes, and to the outer periphery. The small-diameter constricted body attached to the spring has a special structure in which a collar portion with a smaller diameter than the head portion and a tail portion are integrally connected to prevent the spring from coming off, so that the springs fit together exactly. The large diameter head of the pin is located at the connection between the upper hole of the joint and the through hole of the shaft, and the lower hole of the joint is located between the through hole of the shaft and the lower hole of the joint, which is difficult to finish accurately. The small-diameter tail of the pin is positioned to facilitate insertion of the pin into a series of communicating holes, and the inserted pin expands within the communicating hole and is expanded and crimped onto the inner wall surface of the through-hole of the shaft. Next, a concrete example of this invention will be explained with reference to the drawings, focusing on the fixed portion between the universal joint and the shaft.

In the axial direction of the body part 2 of the universal joint 1, there is a hole 3 into which the inner end of the shaft 4 (driving shaft or driven shaft) is inserted. An upper hole 5 and a lower hole 6 are bored in a straight line orthogonally to each other.

On the other hand, the shaft 4 inserted into the hole 3 is also provided with a through hole I perpendicular to the axial direction, and by inserting the shaft 4 into the hole 3 of the joint 1, the three holes 5, 7 A communicating hole is formed at 6 and 6 perpendicular to the axial direction.

A pin 8 is inserted into this communication hole in place of a conventional fixing pin that is tightly inserted into the communication hole and has a length that is approximately equal to the length of both holes.
is a constricted body having a smaller diameter than the head 9, which is connected to the head 9 having the largest diameter among the pins that match the diameter of the communication hole and tightly fit into the throttle hole; 11, a spring ring 10 having a longitudinal slit 10' is loosely fitted in a state slightly protruding from the outer surface of the large diameter head 9, with the intention of preventing the spring ring 10 from coming off, The spring ring 1 is connected to the constricted body portion 11.
In order to facilitate attachment to the constricted body part 11 of the 0, it has a structure in which a tail part 14 and a tail part 13 with a diameter slightly smaller than the large-diameter head part 9 with a tapered part 12 are successively installed. ing.

Alternatively, the tapered tail 14' can be formed integrally with the collar 12 by extending the tapered portion 12 of the collar 12 into a separate small diameter tail as shown in FIG. 5 (FIG. 1).

Upper hole 5 of the joint that matches almost exactly among the series of communication holes
The large-diameter head 9 of the pin 80 is positioned over a part of the through hole 7 of the shaft, that is, at the connecting portion of both the holes 5 and 7, and the pin 8
During insertion, the spring pin 10 enters the through hole 7 of the shaft in a compressed state, and after insertion, the spring 10 expands and comes into pressure contact with the inner surface of the through hole, suppressing the withdrawal of the pin 8. The pin is stably positioned within a series of communicating holes.

In addition, considering the existence of the through hole 7 of the shaft and the lower hole 6 of the joint, which are difficult to match accurately, the collar 13 or tail of the pin 8, which can be loosely inserted, is provided at the joint between the holes 7 and 8. Position 14.

The pin 8 is inserted into the series of communicating holes by inserting the small diameter tail portion 14 of the housing pin 8, and while compressing the spring 10, the large diameter head 9 is press-fitted by hitting the large diameter head 9 with a hammer or the like.

In order to make it easy to press fit the spring 10 in this folded and enlarged state into the communicating hole, the upper button and both lower holes 5 of the joint 1 are
, 6 have shallow countersink-shaped openings 5' on the periphery of the openings on the surface side.
, 6' has been opened.

In the fixing device between the universal joint and the shaft constructed as described above, the large-diameter head 9 that fits tightly into the communication hole is in charge of transmitting torque and resisting large shearing forces. Difficulty in inserting the pin due to drilling errors occurring between the through hole 7 and the lower hole 6 of the joint can be resolved by positioning a collar portion 13 or a tail portion 14 with a smaller diameter than the head 9 of the pin in this area (lower hole of the joint). This problem has been resolved.

In this invention, there is a hole on one side of the body 2 of the universal joint 1, that is, a lower hole 6, and a through hole 7 drilled in the shaft 4.
In order to compensate for the difficulty of precision drilling work to ensure accurate matching and communication between the By locating the small-diameter collar portion 13 or tail portion 14 of the pin, which is smaller than the diameter of the hole 6 and is easy to insert, in the lower hole 6, the difficulty of drilling between the universal joint and the shaft and the associated work are reduced. It is possible to eliminate a decrease in efficiency, and the upper hole 5 of the joint 1 and the through hole 7 of the shaft 4 are relatively easy to match when inserting the pin 8. The head 9 has the largest diameter of the pin in the connecting part between the lower hole 6 of the joint and the through hole 7 of the shaft, which conventionally involved the most trouble and difficulty in inserting the pin. Since the configuration has a smaller diameter collar 13 or tail 14, the pin installation work is extremely simple, and when removing the pin, the pin can be easily removed by hitting the small diameter tail, and the joint and shaft can be easily removed. The spring that prevents the pin from coming out of the communication hole when it is installed is placed deep in the series of communication holes, that is, in the through-hole of the shaft, so it cannot be damaged or detached. Of course, when the universal joint is stationary,
This has the effect of reliably preventing the pin from falling off even during rotational driving.

[Brief explanation of drawings]

Figure 1 is a front view of a universal joint with a drive shaft and a driven shaft fixed to both ends, Figure 2 is an enlarged cross-sectional view taken along line A-A in Figure 1, and Figure 3 is when it is not inserted. Fig. 4 is a partially cutaway front view of the pin, Fig. 4 is a cross-sectional view taken along line B-B in Fig. 3, Fig. 5 is a partially cutaway front view of the bottle when inserted, and Fig. 6 is a partially cutaway front view of Fig. 5. FIG. 7, a cross-sectional view taken along line C--C, is a diagram corresponding to FIG. 3 showing another embodiment. In the figure, 1 is the universal joint, 2 is the body, 3 is the hole, 4 is the shaft, 5 is the upper hole, 5' is the countersunk opening of the upper hole, 6 is the lower hole, and 6' is the lower hole. 7 is a through hole, 8 is a pin, 9 is a large diameter head, 10 is a spring, 11 is a small diameter body, 12 is a tapered portion, 13 is a collar, and 14 is a small diameter tail.

Claims (1)

[Scope of utility model registration request] An upper hole 5 and a lower hole 6 are bored in the body in communication with and orthogonally to the hole 3 bored in the axial direction of the body of the universal joint 1, and -
A through hole 7 is bored in the blade shaft 4 perpendicular to the axial direction, the shaft 4 is inserted into the hole 3, and the three holes 5, 7 and 6 form one communicating hole, Continuing with the large-diameter head 9, a constricted body 11 having a spring ring 10 with a longitudinal slit 10' loosely fitted in the surface thereof is disposed in the communication hole, and a constricted body 11 is connected to the large diameter head 9 and has a spring ring 10 loosely fitted thereon. The pin 8, which has a ring 10 with a smaller diameter each, a collar 13 for preventing falling off, and a tail part 14 successively connected to the head 9, is connected to the upper hole 5 and the through hole 7, and the head 9, which is tightly fitted, is attached to the inner wall of the through hole 7. A fixing device for a universal joint and a shaft, in which a spring ring 10 that is brought into contact with an enlarged pressure is fitted over the lower hole 6 and the remainder of the through hole I by positioning and inserting the collar portion 13 or the tail portion 14, respectively.