JPH0612850U - Support structure for pin member of hydraulic shock absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] To support the metering pin and position detection sleeve so that they can rotate and move in parallel. [Structure] The position detection sleeve 25 has a spherical end 2 at one end.
7, the spherical end 27 is fitted into the recess 16a formed at the tip of the bottom bolt 16 via the O-ring 28, and is further divided by the O-ring 29 at the stopper plates 30 and 30. The side is pressed and the stopper 31
And the stopper plate 30 was fixed with the lock nut 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for a pin member of a hydraulic shock absorber used in a vehicle or the like, for example, a position detection sleeve or a metering pin.

[0002]

[Prior art]

 As a hydraulic shock absorber provided with a position detection sleeve and a metering pin, there is one disclosed in Japanese Utility Model Laid-Open No. 61-70641. In this hydraulic shock absorber, as shown in FIG. 3, a hollow cylinder 103 is erected in an outer tube 101 and a hollow rod 103 is inserted from above through a rod guide 104. A damper is provided at the tip of the hollow rod 103. A piston 104 having an oil passage for generating a damping force and a valve mechanism, which is in sliding contact with the inner peripheral surface of the cylinder 102, is fixed.

Then, a bypass oil passage 105 that bypasses the oil passage of the piston 104 is formed in the middle portion of the hollow rod 103, and a metering pin 106 erected in the damper cylinder 102 is inserted into the hollow rod 103. The metering pin 106 is formed with a taper portion 106a for adjusting the opening area of the bypass oil passage 105 of the hollow rod 103. A spherical end 106b is formed at the rear end of the metering pin 106, and the spherical end 106b is rotatably supported by the pair of support members 107 and 108.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned pin member supporting structure of the hydraulic shock absorber, since the metering pin which is the pin member is only rotatably supported by the spherical end portion, it can be rotated. Since they cannot be moved in parallel, the pin member and the hollow rod may be difficult to be centered due to an integration tolerance in manufacturing or assembling parts, or a sufficient function may not be obtained.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention supports a spherical end portion of a pin member via an elastic member, and can be applied to a position detection sleeve or a metering pin as the pin member.

[0006]

[Action]

 Since the spherical end portion of the pin member is supported via the elastic member, the pin member is rotatable and can be moved in parallel, and the pin member and the hollow rod can be easily centered. Will not impair the function of.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a sectional view of a hydraulic shock absorber to which the pin member support structure according to the present invention is applied, and FIG. 2 is an enlarged sectional view of a main part of FIG.

The cylinder 1 is fitted with an end cap 2 at the upper end and a bottom cap 3 at the lower end to close them, and the cylinder 1 is closed from above by a rod guide 4 and an oil seal 5. The hollow rod 6 is inserted, and the hollow rod end 7 is screwed to the lower end of the hollow rod 6.

A piston 8 which is in sliding contact with the inner peripheral surface of the cylinder 1 is attached to the rod end 7, and a compression side oil passage and an extension side oil passage 10 are formed in this piston 8 and these compression side oil passages are A compression side valve 11 that opens and closes and an extension side valve 12 that opens and closes the extension side oil passage 10 are attached.

A bottom valve case 15 is provided on the bottom of the cylinder 1, a bottom bolt 16 is screwed onto the bottom valve case 15, and a bottom check valve seat 17 is attached to the bottom bolt 16. An oil passage 18 on the compression side and an oil passage on the extension side (not shown) are formed in the bottom check valve seat 17, and a valve 20 for opening / closing the oil passage 18 on the compression side and a valve 21 for opening / closing the valve on the extension side are attached. .

In addition, at the bottom of the bottom of the bottom valve case 15 at the bottom of the cylinder 1, a free piston 22 that slidably contacts the inner peripheral surfaces of the cylinder 1 and the bottom cap 3 in order to compensate for the volume change due to the forward and backward movement of the hollow rod 6. Is slidably fitted to define a gas chamber SG.

Then, a position detecting sleeve 25 made of a non-magnetic material, which is a pin member, is erected from the bottom bolt 16, and the tip end of this position detecting sleeve 25 is inserted into the rod end 7, and the position detecting sleeve 25 A rod-shaped sensor body 26 having one end attached to the hollow rod 6 is inserted therein.

The position detecting sleeve 25, which is the pin member, has a spherical end 27 formed at one end. Then, the spherical end portion 27 of the position detecting sleeve 25 is fitted into the concave portion 16a formed at the front end portion of the bottom bolt 16 via an O-ring 28 which is an elastic member, and is further divided via an O-ring 29. The upper side is pressed by the stopper plates 30 and 30, and the stopper plate 30 is fixed by the stopper 31 and the lock nut 32, so that the bottom bolt 16 is supported around the spherical end 27 via an elastic member. .

In the hydraulic shock absorber configured as described above, when the hollow rod 6 moves up and down, damping force is generated by the oil passage of the piston 8 and the valve mechanism, and the oil passage of the bottom check valve seat 17 is generated. Also, a damping force is generated by the valve mechanism, and the free piston 22 moves up and down to compensate for the volume change accompanying the entry or exit of the hollow rod 6.

Then, as the hollow rod 6 moves up and down, the sensor main body 26 moves in and out of the position detection sleeve 25, so that the magnetic field generated by the sensor main body 26 is blocked. Since the amount of opposition to and changes, it is possible to detect the position of the hollow rod 6, that is, the piston 8.

In this case, since the position detecting sleeve 25 is supported by the spherical end portion 27 via the O-rings 28 and 29 arranged around it, the position detecting sleeve 25 can rotate with respect to the bottom bolt 16. Since it can be moved in parallel, it becomes easy to absorb the error due to the component accuracy and the assembly accuracy of the position detection sleeve 25 and the sensor body 26, and the malfunction of the sensor does not occur and the sensor function is not impaired. .

In the above embodiment, the present invention is applied to the support structure of the position detection sleeve, but it can also be applied to the support structure of the damping force adjusting pin member such as the conventional metering pin described above. You can

[0018]

[Effect of device]

 As described above, according to the present invention, since the pin member having the spherical end portion disposed inside the cylinder is configured to support the spherical end portion through the elastic member, the pin member is pivoted. In addition to being possible, parallel movement is also possible, and it is possible to prevent deterioration in the function of the pin member due to the integration tolerance in manufacturing and assembling parts.

[Brief description of drawings]

FIG. 1 is a sectional view of a hydraulic shock absorber to which a pin member support structure according to the present invention is applied.

2 is a cross-sectional view of the main part of FIG.

FIG. 3 is a sectional view of a conventional hydraulic shock absorber.

[Explanation of symbols]

1 ... Cylinder, 6 ... Hollow rod, 7 ... Rod end, 8
... Piston, 16 ... Bottom bolt, 22 ... Free piston, 25 ... Position detection sleeve, 26 ... Sensor body, 27
... Spherical ends, 28, 29 ... O-rings, 30 ... Stopper plates, 31 ... Stoppers, 32 ... Lock nuts.

Claims (3)

[Scope of utility model registration request] 1. A hydraulic shock absorber in which a pin member having a spherical end portion is erected in a cylinder, and the other end portion side of the pin member is inserted into a hollow rod, wherein the pin member has a spherical end portion. A pin member support structure for a hydraulic shock absorber, characterized in that the periphery is supported via elastic members. 2. The pin member support structure for a hydraulic shock absorber according to claim 1, wherein the pin member is a position detection sleeve through which a rod-shaped position sensor body attached to a hollow rod is inserted. 3. The pin member support structure for a hydraulic shock absorber according to claim 1, wherein the pin member is a metering pin that adjusts an opening area of a bypass oil passage attached to a hollow rod.