JP2553349Y2 - Valve structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve structure of a fluid coupling used for a hydraulic differential limiting device.

[0002]

2. Description of the Related Art As a conventional valve structure provided in this type of fluid coupling, there is, for example, one shown in FIGS. 5 and 6, when a rotation difference occurs between the cam housing 2 fixed to the left axle shaft 1 and the rotor 4 fixed to the right axle shaft 3, the plunger 5 in the discharge stroke moves the cam housing 2 Is pushed inward by the cam surface 2A.

For this reason, the plunger 5 pushes the oil in the plunger chamber 6 from the discharge passage 7 to the hydraulic chamber 9 through the orifice 8, and the one-way valve 10 as a suction valve closes the suction passage 11. At this time, the hydraulic pressure in the discharge path 7 and the plunger chamber 6 increases due to the flow resistance of the orifice 8, and a reaction force is generated in the plunger 5. By rotating the cam housing 2 against the plunger reaction force, a torque is generated, and the torque is transmitted between the cam housing 2 and the rotor 4.

Further, when the cam housing 2 rotates,
The plunger 5 is in the suction stroke, the oil in the hydraulic chamber 9 is sucked into the plunger chamber 6 via the one-way valve 10, and the plunger 5 is moved to the cam surface 2 A of the cam housing 2.
Return to the original position along. Here, one-way valve 1
7 is held by a return spring 12 in order to prevent floating due to centrifugal force, as shown in FIGS. 7 and 8, between the retainer 13 press-fitted into the suction passage 11 and the one-way valve 10. It is interposed in.

The retainer 13 is fixed to the rotor 4 by bolts 14 after being press-fitted into the suction passage 11, and is prevented from coming off. Reference numeral 15 denotes oil holes formed on both sides of the retainer 13.

[0006]

However, in such a conventional valve structure, the performance is sufficient, but the number of parts such as bolts is increased, and a rotor tapping process is required.
There was a problem that the cost was increased due to the counterboring of the carbon-proof plunger and the complicated shape of the retainer.

In addition, there is a problem that the retainer bolt hole and the rotor tap need to be aligned, and the assemblability is reduced. The present invention has been made in view of such conventional problems, and can reduce costs.
It is another object of the present invention to provide a valve structure that can improve assemblability.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a valve element seated on a valve seat of an oil passage, a return spring for pressing the valve element, and a retainer for holding the return spring. In the valve structure of a fluid coupling having, the retainer as a snap ring type having a cantilever beam portion having a projection in the center and a pair of curved portions forming an oil hole outside the cantilever beam portion, When assembled in the groove of the oil passage, the load of the return spring is received at three points of the cantilever beam portion and both heads of the pair of curved portions.

[0009]

In the present invention, since the retainer is of a snap ring type and is fixed to the groove of the oil passage, it is possible to completely prevent the retainer from coming off. At the time of assembling, the load of the return spring is received at the three points of the cantilever beam portion and the two heads of the pair of curved portions, so that sufficient strength can be obtained and the function of the conventional spring receiver is obtained.

Since an oil hole is formed between the cantilever beam and the pair of curved portions, a sufficient oil hole area can be secured. A single member satisfies the functions of the conventional retainer (spring receiving, securing oil hole area, complete retaining), not only reducing the number of parts, but also eliminating the need for conventional processing such as rotor tapping. Therefore, the cost can be reduced.

[0011] Further, the positioning between the retainer bolt hole and the rotor tap as in the prior art is not required, and it is only necessary to fix the retainer bolt hole in the groove, so that the assemblability can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention.
In FIG. 2, reference numeral 21 denotes a rotor, which drives a plunger (not shown) based on a rotational speed difference between the rotor 21 and a cam housing (not shown) to generate flow resistance and control transmission torque.

Reference numeral 22 denotes an oil passage as a suction passage formed in the rotor 21. A check ball 24 as a valve body is seated on a valve seat 23 of the oil passage 22. 25 is check ball 2
The return spring 25 is disposed between the check ball 24 and a snap ring type retainer 26. A groove 27 is formed in the inner wall of the oil passage 22, and a retainer 26 is fixed to the groove 27 and holds the return spring 25.

The retainer 26 in the free state before assembly is shown in FIG.
As shown in FIG. 4 and FIG. 4, a cantilever beam portion 28 having a projection 36 fixed at the center portion by caulking is provided.
A pair of curved portions 29, 30 extend from the base end portion 8 so as to surround the cantilever beam portion 28. A pair of curved portions 2
Heads 33, 34 having round holes 31, 32, respectively, are formed integrally with 9, 30 respectively. Cantilever beam 28
An oil hole 35 through which oil flows is formed between the pair of curved portions 29 and 30.

Next, a snap ring type retainer 2
FIGS. 1 and 2 show a state in which the rotor 6 is assembled in the groove 27 of the rotor 21. Since the retainer 26 is fixed to the groove 27, it is possible to sufficiently prevent the retainer 26 from coming off. At the time of assembling, not only the cantilever beam portion 28 but also a pair of heads 33 and 34
At this point, the load of the return spring 25 and the check ball 24 is received, so that sufficient strength can be secured. That is, the cantilever beam 28 and the heads 33, 3
4 come into contact with each other and interfere with each other, so that a sufficient function as a return spring receiver can be exhibited.

Further, as the area of the oil hole 35, a sufficient area can be secured as in the conventional case. Conventional retainer functions (return spring, check ball receiver,
Oil hole area and complete removal prevention) can be satisfied with one member. In this way, the number of parts can be reduced, and machining such as rotor tapping is not required.
Cost can be reduced. Also, as before,
It is not necessary to align the retainer bolt hole with the rotor tap, and it is only necessary to fix the retainer 26 to the groove 27 as a snap ring type, so that the assemblability can be improved.

[0017]

As described above, according to the present invention, since the retainer is a snap ring type and is fixed to the groove of the rotor, the cost can be reduced, and the assembling property can be reduced. Can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 is a diagram showing a state at the time of assembly.

FIG. 3 is a diagram showing a retainer in a free state.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

FIG. 5 is a half sectional view of a conventional fluid coupling.

FIG. 6 is a sectional view of a conventional fluid coupling.

FIG. 7 is a diagram showing fixing of a conventional retainer.

FIG. 8 is a view showing a conventional valve structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Rotor 22 ... Oil passage 23 ... Valve seat 24 ... Check ball (valve element) 25 ... Return spring 26 ... Retainer 27 ... Groove 28 ... Cantilever part 29, 30 ... Curved part 31, 32 ... Round hole 33, 34 ... head 35 ... oil hole 36 ... projection

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-38575 (JP, U) JP-A-59-195263 (JP, U) JP-A-63-94311 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] In a valve structure of a fluid coupling having a valve body seated on a valve seat of an oil passage, a return spring for pressing the valve body, and a retainer for holding the return spring, the retainer is provided at a center portion. As a snap ring type having a cantilever beam portion having a projection and a pair of curved portions forming an oil hole outside the cantilever beam portion, when assembled to the groove of the oil passage, the cantilever beam portion and the A valve structure, wherein a load of the return spring is received at three points on both heads of a pair of curved portions.