초록 ▼

A check valve, a retainer and a washer are secured to a valve body by inserting a pin therethrough and staking a distal end portion of the pin to form a staked portion. A restraining member is interposed between the washer and the staked portion. The fit clearance between the restraining member and

A check valve, a retainer and a washer are secured to a valve body by inserting a pin therethrough and staking a distal end portion of the pin to form a staked portion. A restraining member is interposed between the washer and the staked portion. The fit clearance between the restraining member and the shank of the pin is set smaller than the fit clearance between the check valve, the retainer and the washer on the one hand and the shank of the pin on the other. Thus, when the distal end portion of the pin is staked, the deformation of the shank of the pin is restrained by the restraining member that defines a small clearance between the same and the pin. Therefore, it is possible to suppress the enlargement in diameter of a portion of the pin where the check valve is fitted and hence possible to prevent deformation of the check valve. Thus, stable valve characteristics can be obtained.

대표청구항 ▼

1. A valve apparatus comprising: a valve body having an opening and a hydraulic fluid passage spaced apart from the opening;at least one valve member comprising an annular disk that selectively opens and closes the hydraulic fluid passage, the valve member being provided at one end of the valve body

1. A valve apparatus comprising: a valve body having an opening and a hydraulic fluid passage spaced apart from the opening;at least one valve member comprising an annular disk that selectively opens and closes the hydraulic fluid passage, the valve member being provided at one end of the valve body;a pin extending through the valve body and the valve member, a distal end portion of the pin being inserted into the opening of the valve body from an opposite end of the valve body;a staked portion formed by staking the distal end portion of the pin so as to clamp an inner peripheral portion of the valve member to the valve body; andat least one ring-shaped restraining member provided between the valve member and the staked portion, the pin extending through the restraining member, the restraining member being adapted to prevent enlargement of a diameter of the pin due to the staking of the distal end of the pin,wherein the inner peripheral portion of the valve member and an inner peripheral portion of the restraining member directly face an outer peripheral portion of the pin,wherein an inner diameter of the restraining member is smaller than an inner diameter of the valve member, andwherein the inner peripheral portion of the valve member is clamped between a clamp portion of the valve body and the restraining member, and an outer peripheral portion of the valve member is arranged to open and close the hydraulic fluid passage of the valve body. 2. The valve apparatus according to claim 1, further comprising: at least one ring-shaped washer provided between the restraining member and the valve member, the pin extending through the washer;wherein an inner diameter of the washer is larger than the inner diameter of the restraining member. 3. The valve apparatus according to claim 2, wherein the washer is formed of a material softer than that of the restraining member. 4. The valve apparatus according to claim 2, wherein the washer has a first surface and a second surface at opposite ends of the washer in an axial direction of the washer, wherein the first surface and the second surface each extend from a radially innermost edge of the washer to a radially outer edge of the washer, and wherein the first surface and the second surface are both entirely flat. 5. The valve apparatus according to claim 1, further comprising: at least one ring-shaped washer provided between the staked portion and the restraining member, the pin extending through the washer;wherein an inner diameter of the washer is larger than the inner diameter of the restraining member. 6. The valve apparatus according to claim 5, wherein the washer is formed of a material softer than that of the restraining member. 7. The valve apparatus according to claim 1, wherein the restraining member is press-fitted to the pin. 8. The valve apparatus according to claim 1, wherein the valve member has a check valve comprising a single disk valve. 9. The valve apparatus according to claim 1, further comprising: a washer and a retainer, the pin extending through the washer and the retainer,wherein the washer, the retainer and the restraining member are all provided between the valve member and the staked portion. 10. A hydraulic shock absorber comprising: a cylinder having a hydraulic fluid sealed therein, the cylinder having two opposite ends;an outer tube surrounding an outer periphery of the cylinder;a reservoir formed between the cylinder and the outer tube;a piston slidably fitted in the cylinder;a piston rod having one end projecting from one end of the cylinder, an opposite end of the piston rod being fixedly secured to the piston;a valve body provided at the other end of the cylinder so as to divide between an interior of the cylinder and the reservoir, the valve body having an opening, anda hydraulic fluid passage spaced apart from the opening, the hydraulic fluid passage communicating between the interior of the cylinder and the reservoir;at least one disk-shaped valve member provided at one end of the valve body inside the cylinder to selectively open and close the hydraulic fluid passage;a pin extending through the valve body and the valve member, a distal end portion of the pin being inserted into the opening of the valve body from an opposite end of the valve body;a staked portion formed by staking the distal end portion of the pin inside the cylinder so as to clamp an inner peripheral portion of the valve member to the valve body; andat least one ring-shaped restraining member provided between the valve member and the staked portion, the pin extending through the restraining member, the restraining member being adapted to prevent enlargement of a diameter of the pin due to the staking of the distal end of the pin,wherein the inner peripheral portion of the valve member and an inner peripheral portion of the restraining member directly face an outer peripheral portion of the pin,wherein an inner diameter of the restraining member is smaller than an inner diameter of the valve member, andwherein the inner peripheral portion of the valve member is clamped between a clamp portion of the valve body and the restraining member, and an outer peripheral portion of the valve member is arranged to open and close the hydraulic fluid passage of the valve body. 11. The hydraulic shock absorber according to claim 10, further comprising: at least one ring-shaped washer provided between the restraining member and the valve member, the pin extending through the washer;wherein an inner diameter of the washer is larger than the inner diameter of the restraining member. 12. The hydraulic shock absorber according to claim 11, wherein the washer is formed of a material softer than that of the restraining member. 13. The hydraulic shock absorber according to claim 11, wherein the washer has a first surface and a second surface at opposite ends of the washer in an axial direction of the washer, wherein the first surface and the second surface each extend from a radially innermost edge of the washer to a radially outer edge of the washer, and wherein the first surface and the second surface are both entirely flat. 14. The hydraulic shock absorber according to claim 10, further comprising: at least one ring-shaped washer provided between the staked portion and the restraining member, the pin extending through the washer;wherein an inner diameter of the washer is larger than the inner diameter of the restraining member. 15. The hydraulic shock absorber according to claim 14, wherein the washer is formed of a material softer than that of the restraining member. 16. The hydraulic shock absorber according to claim 10, wherein the restraining member is press-fitted to the pin. 17. The hydraulic shock absorber according to claim 10, wherein the valve member has a check valve comprising a single disk valve. 18. The hydraulic shock absorber according to claim 10, further comprising: a washer and a retainer, the pin extending through the washer and the retainer,wherein the washer, the retainer and the restraining member are all provided between the valve member and the staked portion.