JP4094311B2 - Vehicle height adjustable damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle height adjustable damper.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a damper for a vehicle, a mounting height position of a spring seat attached to the outer periphery of the damper tube can be adjusted, and a spring seat fixing means is screwed to a screw portion provided on the outer periphery of the damper tube. is there. The vehicle height is lowered by lowering the mounting height position of the spring seat, and the vehicle height is raised by raising the mounting height position.
[0003]
[Problems to be solved by the invention]
The spring carried by the spring seat needs to be set so that the preload is applied without playing when the piston rod is fully extended even in a low vehicle height state where the mounting height position of the spring seat is lowered. Further, even in a high vehicle height state where the spring seat is raised, it is necessary to set so that the spring is not compressed to the close contact when the piston rod is fully retracted.
[0004]
However, if the mounting height position of the spring seat is excessively lowered, the extension stroke of the piston rod becomes excessive, and there is a possibility that play of the spring occurs when the piston rod is fully extended. Moreover, if the mounting height position of the spring seat is excessively increased, the contraction stroke of the piston rod becomes excessive, and there is a risk that the spring will adhere when the piston rod is fully retracted.
[0005]
An object of the present invention is to regulate the adjustment range of the mounting height of the spring seat by the screw operation means , and to change the adjustment range width so as to stabilize the operation of the spring.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 includes a screw operation means that is screwed with respect to the outer periphery of the damper tube so that the mounting height position of the spring seat attached to the outer periphery of the damper tube can be adjusted. In a vehicle height-adjustable damper in which a spring seat fixing means is screwed onto a screw portion provided on the outer periphery , upper and lower restricting means for restricting the adjustment range of the spring seat mounting height by the screw operation means are provided . At least one of the restricting means is a stopper ring that is engaged with a ring groove provided on the outer periphery of the damper tube, and a plurality of ring grooves that can change the engagement position of the stopper ring are provided side by side on the outer periphery of the damper tube. Is.
[0007]
The invention according to claim 2 relates to the invention according to claim 1, wherein one of the upper and lower restricting means is a processed end of a threaded portion provided on the outer periphery of the damper tube, and the other is related to a ring groove provided on the outer periphery of the damper tube. The stopper ring is to be worn.
[0008]
According to a third aspect of the present invention, in the first aspect of the present invention, both the upper and lower restricting means are stopper rings that are engaged with ring grooves provided on the outer periphery of the damper tube.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 is an overall cross-sectional view showing the damper of the first embodiment, FIG. 2 is a cross-sectional view of the main part of FIG. 1, FIG. 3 is a damper of the second embodiment, (A) is a cross-sectional view of the main part, and (B). FIG. 4 is a sectional view taken along line BB.
[0011]
First Embodiment (FIGS. 1 and 2)
FIG. 1 shows a double cylinder type vehicle height adjustable damper 10 in which a damper tube 11 is a double pipe comprising an outer cylinder (outer tube) 12 and an inner cylinder (cylinder) 13, and the outer cylinder 12 and the inner cylinder 13 are ribbed. 14 are concentrically coupled.
[0012]
The damper 10 inserts a piston rod 15 into an inner cylinder 13 built in the outer cylinder 12, connects a fixed mounting bracket (not shown) to the vehicle body at the upper end of the piston rod 15, and attaches the lower end of the outer cylinder 12. It is connected to the wheel side by a bracket 16 to constitute a vehicle suspension system.
[0013]
The damper 10 is suspended between a lower spring seat 17 attached to the outer periphery of the outer cylinder 12 as will be described later, and an upper spring seat (not shown) supported on the back by an attachment bracket at the upper end of the piston rod 15. A spring 18 is interposed.
[0014]
The damper 10 includes a rod guide 21 (bush 21 </ b> A) for the piston rod 15 inserted into the inner cylinder 13, and a shaft seal portion 20 including an oil seal assembly 22, the upper end of the inner cylinder 13 and the outer cylinder 12. It is fixed to the upper end.
[0015]
The damper 10 is provided with a bump stopper 24 at the upper end of the outer cylinder 12, and a bump rubber (not shown) provided in the piston rod 15 is abutted against the bump stopper 24 to restrict the maximum compression stroke of the piston rod 15. The piston rod 15 includes a rebound seat 25 and a rebound rubber 26 at an insertion portion to the inner cylinder 13, and the rebound rubber 26 is abutted against the rod guide 21 to restrict the maximum extension stroke of the piston rod 15.
[0016]
The damper 10 includes a piston valve device 30 and a base valve device 40, and the damping force generated by the damper 10 dampens the expansion and contraction vibration of the piston rod 15 accompanying the absorption of the impact force by the suspension spring 18.
[0017]
The piston valve device 30 accommodates the piston-side oil chamber 32A in which the piston rod 15 is not accommodated in the inner cylinder 13 and the piston rod 15 by the piston 31 provided at the insertion end of the piston rod 15 into the inner cylinder 13. It divides into the rod side oil chamber 32B. The piston 31 has a pressure side flow path 33A including a check valve 33 and an extension side flow path 34A (not shown) including a disk valve 34. Thereby, in the compression stroke, the oil in the piston-side oil chamber 32A passes through the pressure-side flow path 33A, opens the check valve 33, and is guided to the rod-side oil chamber 32B. In the extension stroke, the oil in the rod side oil chamber 32B passes through the extension side flow path 34A, bends and deforms the disk valve 34, opens, and is guided to the piston side oil chamber 32A, thereby generating an extension side damping force.
[0018]
The base valve device 40 fixes the bottom piece 41 to the lower end portion of the inner cylinder 13, and the reservoir chamber 42 that is an annular gap between the outer cylinder 12 and the inner cylinder 13 is partitioned from the piston-side oil chamber 32 </ b> A by the bottom piece 41. ing. The reservoir chamber 42 includes a lower oil chamber and an upper gas chamber. The bottom piece 41 has an extension side flow path 43 </ b> A including a check valve 43 and a pressure side flow path 44 </ b> A including a disk valve 44. As a result, in the extension stroke, the oil corresponding to the retracted volume of the piston rod 15 that retreats from the inner cylinder 13 opens the check valve 43 from the reservoir chamber 42 via the expansion-side flow path 43A and is replenished to the piston-side oil chamber 32A. . In the compression stroke, the oil corresponding to the volume of the piston rod 15 entering the inner cylinder 13 is opened from the piston side oil chamber 32A through the pressure side flow path 44A by bending and deforming the disk valve 44, and is pushed out to the reservoir chamber 42. Get damping force.
[0019]
However, the damper 10 has a vehicle height adjustment structure (FIG. 2). A threaded pipe 51 is inserted into the outer periphery of the outer tube 12 of the damper tube 11 and both ends are fixed by welding. On the outer periphery of the threaded pipe 51, a male thread portion 51A is screwed. The spring seat 17 is configured by welding a sheet portion 53 to the upper end side of the threaded pipe 52 and welding a tool locking portion 54 to the lower end side of the threaded pipe 52. A female thread portion 52 </ b> A is screwed to the inner periphery of the threaded pipe 52. The threaded pipe 52 of the spring seat 17 is threadedly engaged with the threaded pipe 51 of the outer cylinder 12 so that the mounting height position of the spring seat 17 with respect to the outer cylinder 12 can be adjusted, and the threaded pipe 51 of the threaded pipe 51 is threaded. The spring seat 17 is fixed by abutment between the lock nut 55 (fixing means) to be attached and the threaded pipe 52.
[0020]
The vehicle height adjusting means includes a lower restricting means 56 and an upper restricting means 57 that restrict the adjustment range of the mounting height of the spring seat 17.
[0021]
At this time, the threaded pipe 51 is threaded from the upper end portion of the large outer diameter portion where the male thread portion 51A is provided, and the front end of the lower end portion is used as a threaded machining end. The processed end of the male screw portion 51 </ b> A becomes the lower restricting means 56.
[0022]
A ring groove 58 is provided on the outer peripheral portion on the upper end side of the threaded pipe 51, and a stopper ring 59 engaged with the ring groove 58 is used as the upper restricting means 57. The ring groove 58 is provided by being removed from the external thread 51A, but may be provided within the range of the external thread 51A. A plurality of ring grooves 58 (58 </ b> A to 58 </ b> C) that can change the engagement position of the stopper ring 59 in the mounting height direction of the spring seat 17 may be provided in parallel on the outer peripheral portion of the threaded pipe 51. The maximum movement range H of the spring seat 17 is as shown in FIG.
[0023]
Note that the threaded pipe 51 </ b> A and the ring groove 58 may be provided directly on the outer periphery of the outer cylinder 12 without using the threaded pipe 51 that is separate from the outer cylinder 12.
[0024]
The spring seat 17 may be formed by integrally forming the threaded pipe 52, the seat portion 53, and the tool locking portion 54.
[0025]
Further, the lower restricting means 56 is not formed by the processed end of the external thread portion 51A, and the lower restricting means 56 is also configured by a stopper ring that is engaged with a ring groove provided on the outer peripheral portion on the lower end side of the threaded pipe 51. May be.
[0026]
According to this embodiment, there are the following operations.
(Operation corresponding to claim 1)
(a) Due to the presence of the lower restricting means 56, the spring seat 17 is not lowered below the lower restricting means 56, and the vehicle height is not lowered too much. As a result, the spring 18 is set so that the preload is applied without playing when the piston rod 15 is fully extended even in a low vehicle height state where the mounting height position of the spring seat 17 is lowered.
[0027]
Further, the spring seat 17 does not rise above the upper restricting means 57 due to the presence of the upper restricting means 57, and the vehicle height is not raised too much. Thus, even when the spring seat 17 is raised, the spring 18 is set so as not to be compressed to the close contact when the piston rod 15 is fully retracted.
[0028]
(Operation corresponding to claim 2)
(b) The lower restricting means 56 is constituted by the processed end of the external thread portion 51A provided on the outer periphery of the outer cylinder 12 of the damper tube 11, and the upper restricting means 57 is provided on the outer periphery of the outer cylinder 12 of the damper tube 11. It is easy to configure by the stopper ring 59 that is engaged with 58.
[0029]
(Operation corresponding to claim 3)
(c) It is also simple to configure both the lower restricting means 56 and the upper restricting means 57 by stopper rings that are engaged with ring grooves provided on the outer periphery of the outer tube 12 of the damper tube 11.
[0030]
(Operation corresponding to claim 1 )
(d) Since a plurality of ring grooves 58A to 58C are provided on the outer periphery of the outer cylinder 12 of the damper tube 11 and the engagement position of the stopper ring 59 can be changed, it is possible to realize common parts for the change of the spring 18. .
[0031]
Second Embodiment (FIG. 3)
3 differs from the first embodiment in the vehicle height adjustment structure. A male thread portion 61 </ b> A is screwed on the outer periphery of the outer tube 12 of the damper tube 11. The spring 17 is configured by integrally molding a seat portion 63 on the upper end side of the pipe portion 62. A key 64 is integrally formed on a part of the inner circumference of the pipe portion 62 and a key groove 64 </ b> B is formed on the outer circumference of the outer cylinder 12. The pipe portion 62 of the spring seat 17 engages the key 64A with the key groove 64B and is inserted while being prevented from rotating with respect to the outer cylinder 12, so that the mounting height position of the spring seat 17 with respect to the outer cylinder 12 can be adjusted. The The spring seat 17 is fixed by abutment between the double nuts 65A and 65B (fixing means) screwed to the male thread portion 61A of the outer cylinder 12 and the lower end surface of the pipe portion 62 of the spring seat 17.
[0032]
The vehicle height adjusting means includes a lower restricting means 66 and an upper restricting means 67 that restrict the adjustment range of the mounting height of the spring seat 17.
[0033]
At this time, the outer cylinder 12 is threaded from the upper end side of the large outer diameter portion where the external thread portion 61A is provided, and the front end of the lower end portion is used as a threaded machining end. The processed end of the male screw portion 61 </ b> A becomes the lower regulating means 66.
[0034]
Further, a ring groove 68 is provided on the outer peripheral portion on the upper end side of the outer cylinder 12, and a stopper ring 69 engaged with the ring groove 68 is used as the upper restricting means 67. A plurality of ring grooves 68 (68 </ b> A to 68 </ b> C) that can change the engagement position of the stopper ring 69 in the mounting height direction of the spring seat 17 may be provided in parallel on the outer peripheral portion of the outer cylinder 12. The maximum movement range H of the spring seat 17 is as shown in FIG.
[0035]
The lower restricting means 66 may not be formed by the processed end of the external thread portion 61A, and the lower restricting means 66 may also be configured by a stopper ring that is engaged with a ring groove provided on the outer peripheral portion of the outer cylinder 12.
[0036]
According to the present embodiment, there are operations similar to (1) to (4) in the first embodiment.
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention. For example, the present invention can be employed in a single cylinder type damper.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to regulate the mounting height position of the spring seat and stabilize the operation of the spring.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view showing a damper according to a first embodiment.
FIG. 2 is a cross-sectional view of the main part of FIG.
FIGS. 3A and 3B show a damper according to a second embodiment, in which FIG. 3A is a cross-sectional view of an essential part, and FIG. 3B is a cross-sectional view taken along line BB.
[Explanation of symbols]
10 Vehicle height adjustable damper 11 Damper tube 12 Outer cylinder 17 Spring seat 18 Spring 51A, 61A Male thread 55, 65A, 65B Nut (fixing means)
56, 66 Lower regulating means 57, 67 Upper regulating means 58, 58A to 58C, 68, 68A to 68C Ring groove 59, 69 Stopper ring

Claims (3)

There is a screw operating means for screwing with respect to the outer periphery of the damper tube so that the mounting height position of the spring seat attached to the outer periphery of the damper tube can be adjusted, and a screw portion provided on the outer periphery of the damper tube In the vehicle height adjustable damper formed by screwing the fixing means of the spring seat,
Upper and lower restricting means for restricting the adjustment range of the mounting height of the spring seat by the screw operation means are provided ,
At least one of the upper and lower restricting means is a stopper ring that is engaged with a ring groove provided on the outer periphery of the damper tube, and a plurality of ring grooves that can change the engagement position of the stopper ring are provided side by side on the outer periphery of the damper tube. vehicle height adjusting damper, characterized in that the.   2. The vehicle height according to claim 1, wherein one of the upper and lower regulating means is a processed end of a thread portion provided on the outer periphery of the damper tube, and the other is a stopper ring that is engaged with a ring groove provided on the outer periphery of the damper tube. Adjustable damper.   The vehicle height-adjustable damper according to claim 1, wherein both the upper and lower regulating means are stopper rings that are engaged with ring grooves provided on the outer periphery of the damper tube.

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