JPS6221158Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a hydraulic shock absorber.

When a hydraulic shock absorber is applied to an automobile, in which a piston is fitted into a cylinder filled with oil and a movable valve mechanism is provided on the piston, when the automobile is running,
For example, when traveling at a speed of 20 to 30 km/h, the hydraulic shock absorber may make an abnormal noise. As a result of investigation, it has been found that this noise is caused by the valve mechanism colliding with a guide member that guides the valve mechanism during movement of the valve mechanism.

This invention was made in view of the above points,
The purpose is to provide a hydraulic shock absorber that does not generate abnormal noise.

According to the present invention, the object comprises a cylinder defining an oil field and an oil field defining member provided within the cylinder to define the oil field into two oil fields;
The oil field defining member includes a cylindrical guide member having a through hole in the bottom and a cylindrical part, respectively, in order to allow oil to pass through when moving along the axis of the cylinder, and a cylindrical guide member that has through holes in the bottom and the cylindrical part, respectively, and a cylindrical guide member that is connected to the oil pressure in the oil field. In order to communicate the two oil fields in response, the guide member is fitted in the guide member so as to be movable along the axial direction of the cylinder, and has a reduced diameter portion at the end facing the bottom of the guide member. , a valve mechanism each having an enlarged diameter portion connected to the reduced diameter portion on the opposite side from the bottom portion, and one end of which is connected to the guide member in order to separate the valve mechanism and the guide member from each other. a truncated conical coil spring, the other end of which is attached to the boundary between the cylindrical part and the bottom, and the other end of which is attached to the boundary between the reduced diameter part and the enlarged diameter part, and the valve mechanism along the axial direction. an elastic member provided between the inner surface of the bottom portion and a surface of the reduced diameter portion opposite to the inner surface of the bottom portion in order to prevent the reduced diameter portion from colliding with the inner surface of the bottom portion of the guide member during movement; This is achieved by a hydraulic shock absorber consisting of.

Next, a preferred specific example of the present invention will be explained based on the drawings.

1 and 2, an inner cylinder 3 serving as a cylinder is disposed inside an outer cylinder 2 of a double cylinder type hydraulic shock absorber 1, and a cap 4 is provided at one end of the outer and inner cylinders 2 and 3. is installed. A piston 7 as an oil field defining member is attached to one end of the piston rod 5 by a nut 6, and the piston 7 separates the oil field in the inner cylinder 3, that is, the chamber 8, into two oil fields, that is, chambers 9 and 10. It is defined in
The piston 7 consists of a piston body 12 and a cylinder 13 mounted on the small diameter portion 11 of the rod 5, and a valve mechanism 14 and a guide member 15 mounted on the cylinder 13. The main body 12 is provided with a plurality of through holes 17 that communicate the chamber 16 between the valve mechanism 14 and the main body 12 with the chamber 10, and an O-ring 18 is fitted around the outer periphery of the main body 12. . The valve mechanism 14 includes a retainer 20 that is movably attached to the cylinder body 13 in a direction along the axis 19 of the inner cylinder 3, that is, in the A direction, and a plurality of flexible annular valve bodies 21. 20 is provided with a plurality of through holes 22. The retainer 20 consists of a reduced diameter part 90 and an enlarged diameter part 91. When the hole 22 is not closed by the valve body 21, the chamber 23 between the retainer 20 and the cylindrical guide member 15 communicates with the chamber 16. A truncated conical coil spring 24 is provided between the retainer 20 and the guide member 15, and one end of the coil spring is located at the boundary between the bottom 30 of the guide member 15 and the cylindrical portion 27, and the other The ends of the retainer 20 are attached to the boundaries between the reduced diameter part 90 and the enlarged diameter part 91, respectively. The spring 24 presses the retainer 20 against the main body 12 with extremely weak force. Outer periphery 25 of retainer 20 and valve body 21
is in slidable contact with the inner surface of a cup-shaped guide member 15, and the guide member 15 guides the movement of the valve body 21 in the A direction. An annular gap 26 is formed between the guide member 15 and the inner cylinder 3, and the guide member 1
A plurality of through holes 28 are provided in the cylindrical portion 27 of 5, and when the valve body 21 is moved in the B direction together with the retainer 20 and an annular gap is created between the valve body 21 and the main body 12, the chamber is closed. 16 is communicated with the gap 26 via this gap and the hole 28. A plurality of through holes 3 are provided in the upper end surface portion 30 as the bottom portion of the guide member 15.
1 is provided, and the hole 31 communicates the chamber 9 and the chamber 23. Retainer 2 facing upper end surface portion 30
An annular elastic member 32 is fixed to one side of the retainer 20, and the elastic member 32 allows the retainer 20 to directly contact the upper end surface portion 30 when the retainer 20 moves in the B direction.
It prevents them from attacking. A rod guide 33 is fitted to the upper end of the inner cylinder 3, a cap 34 is fitted between the guide 33 and the outer cylinder 2, and a packing 35 is provided inside the cap 34. The rod 5 passes through the guide 33, cap 34 and packing 35 and projects to the outside. The packing 35 is pressed against the rod 5 and the cap 34 by a coil spring 36. A protection tube 37 and a mounting ring 38 are fixed to the protruding end of the rod 5. Another oil field defining member 39 is provided at the lower part of the inner cylinder 3, and the defining member 39 includes a support member 40, a valve mechanism 41, and a guide member 42, and the defining member 39 includes a support member 40, a valve mechanism 41, and a guide member 42, and divides the chamber 10 into two oil fields. It is defined into two areas, ie, chambers 43 and 44. A through hole 45 is provided in the center of the support member 40, and the valve mechanism 4
A chamber 46 between the support member 1 and the support member 40 is communicated with the chamber 44 through a hole 45. The valve mechanism 41 includes a retainer 48 having a plurality of through holes 47 and an annular valve body 4.
9, and the retainer 48 consists of a reduced diameter part 92 and an enlarged diameter part 93. The retainer 48 and the flexible valve body 49 are movable in the A direction. When the hole 47 is not closed by the valve body 49, the hole 47 communicates the chamber 50 between the retainer 48 and the guide member 42 with the chamber 46. A truncated conical coil spring 51 is provided between the retainer 48 and the guide member 42, and one end of the coil spring 51 is located at the boundary between the bottom 55 of the guide member 42 and the cylindrical portion 52, and the other The ends of the retainer 48 have a reduced diameter part 92 and an enlarged diameter part 9.
They are attached at the boundary with 3. The spring 51 presses the retainer 48 against the support member 40 with an extremely weak force. Guide member 4 that guides movement of retainer 48 and valve body 49 in direction A
A plurality of grooves 53 extending in the A direction are formed in the cylindrical portion 52 of No. 2, and the valve body 49 is moved in the B direction together with the retainer 48 while closing the hole 47, and the valve body 49 and the support member 40 are moved together. When an annular gap is formed in the gap 54, the chamber 46 is communicated with the chamber 50 via this gap and the groove 53. A plurality of through holes 56 are provided in an upper end surface portion 55 serving as a bottom portion of the guide member 42, and the holes 56 communicate the chambers 43 and 50. An annular elastic member 57 is fixed to one side of the retainer 48 facing the upper end surface portion 55, and the elastic member 57 causes the retainer 48 to directly collide with the upper end surface portion 55 when the retainer 48 moves in the B direction. It prevents Lower end 58 of guide member 42
and the lower end 59 of the support member 40 are held between the inner cylinder 3 and the cap 4, whereby the guide member 42 and the support member 40 are fixed to the inner cylinder 3. A plurality of grooves 60 are provided at the lower end 59 of the support member 40.
A groove 60 and a groove 61 formed in the cap 4 communicate the annular chamber 62 defined by the inner and outer cylinders 2 and 3 with the chamber 44.
An oil liquid 63 is sealed in the lower part of the chamber 62 and the chamber 9, and a gas 64 is sealed in the upper part of the chamber 62. A mounting ring 65 is fixed to the cap 4.

The hydraulic shock absorber 1 configured in this manner is attached to, for example, an automobile via the attachment rings 38 and 65. While the car is running, when a force is applied that causes the rod 5 to enter the inner cylinder 3, that is, when a force that shortens the hydraulic shock absorber 1 is applied, the rod 5 and the piston 7 move in the C direction with respect to the inner cylinder 3. Move to. When the piston 7 moves in the C direction, the hole 2
2 is closed by the valve body 21, the valve body 21 and the retainer 20 are moved in the direction B with respect to the rod 5 against the spring 24, and a gap is created in the gap 29.
The oil in the chamber 10 flows into the chamber 9 through this gap, the holes 28, 17, and the gap 26, and the oil in the chamber 8 corresponding to the volume of the rod 5 entering the chamber 8 flows into the valve body 4.
By releasing the closure of the hole 47 by 9,
It flows into chamber 62 through hole 56, hole 47, chamber 44, grooves 60 and 61, and compresses gas 64. With the above operations, the buffer 1 produces a buffering effect. Conversely, when a force that causes the rod 5 to protrude outside the inner cylinder 3 is applied, that is, when a force that causes the hydraulic shock absorber 1 to extend is applied, the piston 7 moves in the direction B relative to the inner cylinder 3. When the piston 7 moves in the B direction, the closure of the hole 22 by the valve body 21 is released, while the gap 29 no longer occurs, and the oil in the chamber 9 flows into the chamber 10 through the hole 31, holes 22, and 17. The oil in the chamber 62 corresponding to the volume of the rod 5 that protrudes outside the chamber 8 moves the retainer 48 and the valve body 49 that closes the hole 47 in the direction B against the spring 51. A gap is created in 54, and the liquid flows into the chamber 43 through this gap, the grooves 53, 60, 61, and the hole 56. As a result, the buffer 1 produces a buffering effect in the same manner as described above.

By the way, when the retainers 20 and 48 move in the B direction when the shock absorber 1 is shortened or expanded, the elastic members 3 are attached to the retainers 20 and 48, respectively, in the shock absorber 1.
2 and 57, the retainer 20
and 48 can be prevented from directly impacting the guide members 15 and 42, respectively, and the abnormal noise caused by the direct impact of the retainers 20 and 48 against the guide members 15 and 42 can be eliminated.

By the way, in the specific example, the retainers 20 and 4
Although the elastic members 32 and 57 are attached to the guide member 8, the present invention is not limited thereto.For example, the elastic members 32 and 57 may be attached to the guide member as shown in FIG. That is, the third
In the figure, the elastic member 70 is fitted into a through hole 71 provided in the guide member 42.
0 prevents the retainer 48 from directly hitting the guide member 42. The elastic member 70 has holes 56
A through hole 72 may be provided which acts in the same manner as the above.

Furthermore, when the guide member 42 is provided with an elastic member, it may be arranged as shown in FIG. 4, for example. That is, in FIG. 4, the mounting member 73 is caulked and attached to the hole 71 of the guide member 42, and the mounting member 73 is attached to the hole 71 of the guide member 42.
An elastic member 74 may be attached to the lower surface of the holder by adhesive or similar means. Note that a protection plate 75 may be attached to the lower surface of the elastic member 74 to prevent damage to the elastic member 74.

Additionally, as shown in FIG. 5, elastic members 78 and 79 may be formed by baking an elastic material onto at least one of the upper surface 76 of the retainer 48 and the lower surface 77 of the guide member 42.

Incidentally, instead of the elastic members 78 and 79, an elastic member 80 is formed by baking an elastic material onto the surface of the coil spring 51 to prevent a direct collision between the retainer 48 and the guide member 42 and to prevent abnormal noise. You can also do this. Similarly, the spring 24 may also be formed with an elastic member to prevent abnormal noise.

Furthermore, the contact surface 81 between the cylinder 13 and the guide member 15, the contact surface 82 between the inner cylinder 3 and the guide member 42, and the contact surface 8 between the cap 4 and the support member 40 shown in FIG.
An elastic member may be interposed between each contact surface, or an elastic material may be baked on at least one surface of each contact surface to form an elastic surface, thereby preventing the transmission of abnormal noise in the same manner as described above.

Further, in the specific example shown in FIGS. 1 and 2, movable valve mechanisms 14 and 41 are provided in both oil field defining members 7 and 39, respectively, but the present invention is not limited to this. The oil field defining member may be provided with a stationary valve mechanism. In addition, the present invention is not limited to a double cylinder type hydraulic shock absorber, but can also be applied to a single cylinder type hydraulic shock absorber.

As described above, according to the present invention, the elastic member that prevents the valve mechanism from directly colliding with the guide member is disposed between the valve mechanism and the guide member, thereby eliminating the generation of abnormal noise during operation. obtain.

Further, in the present invention, the guide member of the valve mechanism is provided with a reduced diameter portion at the end facing the bottom and an enlarged diameter portion connected to the reduced diameter portion on the opposite side from the bottom. , one end of the truncated conical coil spring is attached to the boundary between the reduced diameter part and the enlarged diameter part, and the other end of the coil spring is attached to the boundary between the bottom part of the guide member and the cylindrical part, thereby forming a valve mechanism. Since the guide member is configured to be spaced apart from each other,
This has the advantage that one end of the coil spring can be securely held on the valve mechanism and the other end on the guide member.

In addition, since the coil spring is held securely as described above and has a truncated conical shape, even when a coil spring with extremely weak spring elasticity is used, the coil spring remains between the bottom inner surface of the guide member and the reduced diameter part. There is no risk of being bitten or damaged. That is, a coil spring with extremely weak spring elasticity can be used to separate the valve mechanism and the bottom of the guide member from each other, and as a result, the valve mechanism in the hydraulic shock absorber of the present invention resists the displacement of the piston. It has the advantage of being able to respond extremely sharply.

Furthermore, in the present invention, an elastic member is provided between the bottom inner surface of the guide member and the surface of the reduced diameter portion opposite to the bottom inner surface, so that when the valve mechanism moves along the axial direction, By preventing the reduced diameter portion from colliding with the inner surface of the bottom portion, the following advantages can be obtained.

If a coil spring with extremely weak spring elasticity is used, this coil spring will contract greatly in response to a certain external force, so the coil spring alone will prevent a direct collision between the reduced diameter part of the valve mechanism and the bottom inner surface of the guide member. In order to achieve this, it is necessary to increase the distance between the inner surface of the bottom portion of the guide member and the surface of the reduced diameter portion, and at the same time, it is necessary to increase the length of the coil spring. However, if an elastic member is provided between the inner surface of the bottom part of the guide member and the surface of the reduced diameter part opposite to the inner surface of the bottom part, the distance between the inner surface of the bottom part of the guide member and the surface of the reduced diameter part can be reduced. Even if the inner surface of the bottom portion and the surface of the reduced diameter portion are directly collided with each other, it is possible to avoid a direct collision between the inner surface of the bottom portion and the surface of the reduced diameter portion. That is, by providing an elastic member between the inner surface of the bottom part of the guide member and the surface of the reduced diameter section, it is possible not only to prevent abnormal noise from occurring due to direct collision between these two surfaces, but also to prevent the occurrence of abnormal noise due to direct collision between these two surfaces. Compared to the case where no elastic member is provided in between, there are advantages in that the coil spring, which has extremely weak spring elasticity, can be shortened, and at the same time, the length of the cylindrical portion of the guide member can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a preferred embodiment of the present invention;
FIG. 2 is a partially detailed sectional view of the specific example shown in FIG.
3 and 4 are explanatory views of other specific examples of the arrangement of the elastic members, respectively, and FIG. 5 is explanatory views of other specific examples of the elastic members. 3... Inner cylinder, 7... Piston, 14, 41...
Valve mechanism, 15, 42... Guide member, 32, 57...
...Elastic member.

Claims (1)

[Scope of utility model registration request] It consists of a cylinder that defines an oil field and an oil field defining member installed inside the cylinder to define the oil field into two oil fields. A cylindrical guide member has a through hole in the bottom and a cylindrical part to allow the oil to pass through during movement, and an axis of the cylinder to communicate between the two oil fields in response to the oil pressure in the oil field. The guide member is fitted in the guide member so as to be movable along the direction, and has a reduced diameter portion at the end facing the bottom of the guide member.
In order to separate the valve mechanism and the guide member from each other, the valve mechanism has an enlarged diameter part connected to the reduced diameter part on the side opposite to the bottom part. a truncated conical coil spring, the other end of which is attached to the boundary between the cylindrical part and the bottom, and the other end of which is attached to the boundary between the reduced diameter part and the enlarged diameter part, and the valve mechanism that extends along the axial direction. an elastic member provided between the inner surface of the bottom portion and a surface of the reduced diameter portion opposite to the inner surface of the bottom portion in order to prevent the reduced diameter portion from colliding with the inner surface of the bottom portion of the guide member during movement; Hydraulic shock absorber consisting of.