JPH0530652U - Valve structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to reduce the cost and improve the assemblability of the valve structure of the fluid coupling. [Structure] Assembling a retainer as a snap ring type having a cantilever beam portion having a protrusion in the center and a pair of curved portions forming an oil hole on the outside of the cantilever beam so as to be assembled in a groove of an oil passage. To configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve structure of a fluid coupling used in a hydraulic differential limiting device or the like.

[0002]

[Prior Art]

 As a conventional valve structure provided in this type of fluid coupling, there is, for example, one shown in FIGS. In FIGS. 5 and 6, when there is a difference in rotation 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 causes the cam housing to move. The cam surface 2A of 2 pushes it inward.

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

Further, when the cam housing 2 rotates, the plunger 5 enters 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 of the cam housing 2. Return to the original position along 2A. Here, as shown in FIGS. 7 and 8, the one-way valve 10 is held by a return spring 12 in order to prevent lifting due to centrifugal force, and the return spring 12 is press-fitted into the intake passage 11. It is interposed between 13 and the one-way valve 10.

The retainer 13 is fixed to the rotor 4 with a bolt 14 after being press-fitted into the suction passage 11 to prevent the retainer 13 from coming off. Reference numeral 15 is an oil hole formed on both sides of the retainer 13.

[0006]

[Problems to be solved by the device]

 However, although such a conventional valve structure has sufficient performance, due to an increase in the number of parts such as bolts, rotor tap processing, carburizing plunger counter boring processing, and complicated retainer shape, etc. There was a problem that the cost increased.

Further, there is a problem in that the retainer bolt hole and the rotor tap need to be aligned with each other, which deteriorates the assembling property. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a valve structure capable of reducing the cost and improving the assemblability. ..

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a valve structure of a fluid coupling having 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. When the retainer is a snap ring type having a cantilever beam having a protrusion in the center and a pair of curved portions forming an oil hole outside the cantilever beam, when assembled in the groove of the oil passage. The load of the return spring is received at three points, that is, both the head portions of the cantilever beam portion and the pair of curved portions.

[0009]

[Action]

 In the present invention, the retainer is of a snap ring type and is fixed in the groove of the oil passage, so that the retainer can be completely prevented from coming off. At the time of assembly, the load of the return spring is received at the three points of the cantilever beam and both heads of the pair of curved portions, so sufficient strength can be obtained, and it has the same function as the spring support.

Since the oil hole is formed between the cantilever beam portion and the pair of curved portions, it is possible to secure a sufficient oil hole surface area. A single member can fulfill the functions of a conventional retainer (spring receiver, secure oil hole area, complete removal prevention), not only can the number of parts be reduced, but also conventional rotor tapping and other processing can be performed. Since it is unnecessary, the cost can be reduced.

Further, it is not necessary to align the retainer bolt hole with the rotor tap as in the conventional case, and it is only necessary to fix the retainer bolt hole and the rotor tap in the groove, so that the assembling property can be improved.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention. In FIG. 2, reference numeral 21 denotes a rotor, which drives a plunger (not shown) by a difference in rotational speed between the rotor 21 and a cam housing (not shown) to generate a flow resistance to control a transmission torque.

Reference numeral 22 denotes an oil passage formed as a suction passage in the rotor 21, and a check ball 24, which is a valve element, sits on a valve seat 23 of the oil passage 22. A return spring 25 presses the check ball 24, and the return spring 25 is interposed between the check ball 24 and a snap ring type retainer 26. A groove 27 is formed on the inner wall of the oil passage 22, and a retainer 26 is fixed to the groove 27 to hold the return spring 25.

As shown in FIGS. 3 and 4, the retainer 26 in the free state before assembly has a cantilever beam portion 28 having a protrusion 36 fixed to the center portion by caulking, and the base of the cantilever beam portion 28. A pair of curved portions 29, 30 extends from the end portion so as to enclose the cantilever portion 28. Head portions 33 and 34, in which round holes 31 and 32 are formed, are integrally formed on the pair of curved portions 29 and 30, respectively. An oil hole 35 through which oil flows is formed between the cantilever portion 28 and the pair of curved portions 29, 30.

Next, FIGS. 1 and 2 show a state in which the snap ring type retainer 26 is assembled in the groove 27 of the rotor 21. Since the retainer 26 is fixed in the groove 27, sufficient retainer can be prevented. At the time of assembling, not only the cantilever beam portion 28 but also the pair of head portions 33 and 34 at three points receive the load of the return spring 25 and the check ball 24, so that sufficient strength can be secured. That is, since the cantilever portion 28 and the head portions 33 and 34 come into contact with each other and interfere with each other, 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. The function of the conventional retainer (return spring, check ball receiver, securing oil hole area, complete removal prevention) can be satisfied with one member. In this way, the number of parts can be reduced, and processing such as rotor tap processing is unnecessary, so that cost can be reduced. Further, unlike the conventional case, it is not necessary to align the retainer bolt hole with the rotor tap, and it is only necessary to fix the retainer 26 in the groove 27 as a snap ring type, so that the assembling property can be improved.

[0017]

[Effect of the device]

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

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a state when assembled.

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

FIG. 4 is a view on arrow AA of FIG.

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 view showing fixing of a conventional retainer.

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

[Explanation of symbols]

 21 ... Rotor 22 ... Oil passage 23 ... Valve seat 24 ... Check ball (valve body) 25 ... Return spring 26 ... Retainer 27 ... Groove 28 ... Cantilever beam 29, 30 ... Curved portion 31, 32 ... Round hole 33, 34 … Head 35… Oil hole 36… Protrusion

Claims (1)

[Scope of utility model registration request] 1. 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. As a snap ring type having a cantilever portion having a projection and a pair of curved portions forming an oil hole on the outside of the cantilever portion, when assembled in the groove of the oil passage, the cantilever portion and the A valve structure in which the load of the return spring is received at three points on both heads of a pair of curved portions.