JP4261670B2 - Strut damper dust cover mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust cover mounting structure for a strut damper used in an automobile.
[0002]
[Prior art]
Conventionally, as described in Japanese Utility Model Publication No. 3-11467, as a strut damper, a damper cylinder includes a wheel side mounting member, a piston rod includes a vehicle body side mounting member, and a lower spring seat fixed to the outer periphery of the cylinder. The suspension spring is interposed between the upper spring seat that is installed around the piston rod and supported on the back surface of the vehicle body side attachment member via a thrust bearing. In the strut damper, the cylinder rotates via the tie rod during steering, so the suspension spring and the upper spring seat both follow the rotation of the lower spring seat fixed to the cylinder and smoothly follow the presence of the thrust bearing. It is something that can be made to.
[0003]
Further, in the conventional strut damper, the bump rubber inserted on the outer periphery of the piston rod is supported on the back by the upper spring seat, and the contraction end of the damper can be regulated by the collision between the end of the cylinder and the bump rubber.
[0004]
[Problems to be solved by the invention]
However, in the conventional strut damper, the dust cover that covers the piston rod penetrating portion at the end of the cylinder has an upper end fixed to the bump rubber and a lower end that is an open end with a gap around the cylinder. For this reason, the dust cover cannot prevent rainwater and dust from entering from the lower open end.
[0005]
In the prior art, when the lower end portion of the dust cover is attached to the outer peripheral portion of the cylinder without a gap, the lower end portion of the dust cover rotates with the cylinder when the cylinder is rotated by the steering steering force described above. The upper end of the dust cover is firmly attached to the outer periphery of the piston rod and is fixed to the immovable bump rubber so that it does not move. At this time, the dust cover is twisted and broken.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to seal a piston rod penetrating portion at a cylinder end with a dust cover and prevent the dust cover from being twisted in a dust cover mounting structure of a strut damper.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, the damper cylinder includes a wheel side mounting member, the piston rod includes a vehicle body side mounting member and a thrust bearing, and is fixed to the outer periphery of the cylinder. A bump rubber inserted in the outer periphery of the piston rod is mounted on the upper spring seat with a suspension spring between the upper spring seat that is installed on the vehicle body side and supported by the rear surface of the vehicle body side mounting member through a thrust bearing. A strut damper dust cover mounting structure that includes a dust cover that supports the back surface of the cylinder and can regulate the contraction end of the damper by abutting between the cylinder end and the bump rubber, and covers the piston rod penetration at the cylinder end. in the lower end of the dust cover is secured to the spring rubber attached to the lower spring seat, the A spring rubber upper end attached to the upper spring seat Sutokaba, in which as formed by sandwiched between the restraint cap for bump rubber.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the restraining cap is made of metal .
[0009]
[Action]
The present invention has the following effects (a) to (c) .
(a) The dust cover has a lower end attached to a lower spring seat fixed to the outer periphery of the cylinder, and an upper end attached to an upper spring seat installed around the piston rod. Accordingly, the upper and lower ends of the dust cover are closed, and the penetration of rainwater and dust can be prevented, and the piston rod penetration at the end of the cylinder can be sealed.
[0010]
(b) In the strut damper, the upper spring seat rotates together with the suspension spring to follow the rotation of the lower spring seat fixed to the cylinder due to the presence of the thrust bearing in order to allow the cylinder to rotate by the steering steering force. To do. In other words, in the present invention, the lower spring seat and the upper spring seat rotate together synchronously with the dust cover being attached to the lower spring seat and the upper spring seat at the upper and lower ends, respectively. The dust cover will not be twisted. In addition, since the upper end of the dust cover is set so as not to contact the bump rubber, when the upper end of the dust cover rotates together with the upper spring seat, any resistance to the rotation is given from the bump rubber. There is no.
[0011]
(c) The lower end of the dust cover is fixed to the spring spring attached to the lower spring seat, and the upper end of the dust cover is sandwiched between the upper spring seat and the restraining cap for the bump rubber. did. Thereby, the attachment structure of a dust cover can be simplified and the assembly property of a damper can be simplified. At this time, the dust cover is rotated by the upper spring seat together with the restraining cap on the upper end side, and the restraining cap is in contact with the bump rubber, but the restraining cap is made of metal such as iron and has a friction coefficient. Since it is small, it can be rotated from the bump rubber without any difficulty with almost no resistance to the rotation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 is a cross-sectional view of the main part showing the entire strut damper, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the main part of FIG.
[0013]
As shown in FIG. 1, the strut damper 10 includes a cylinder 11 and a piston rod 12, and the cylinder 11 includes a wheel side mounting member 13 and is coupled to a wheel, and the piston rod 12 is connected to a vehicle body side mounting member. 14 is attached to the vehicle body. The vehicle body side mounting member 14 is a washer 15, a cover 16, and a mount rubber, which are attached around the small diameter portion 12A on the upper end side of the piston rod 12 and on the step portion with the medium diameter portion 12B following the small diameter portion 12A. 17, and a washer 18 is fastened by a nut 19.
[0014]
The strut damper 10 is installed around the piston rod 12 and the lower spring seat 21 fixed to the outer periphery of the cylinder 11, and is supported by the vehicle body side mounting member 14 on the back side through a thrust bearing 25. A suspension spring 23 is interposed between the seat 22 and the seat 22. Specifically, the suspension spring 23 is seated on the spring rubber 21 </ b> A of the lower spring seat 21 and the spring rubber 22 </ b> A of the upper spring seat 22. In the strut damper 10, the cylinder 11 is rotated via a tie rod (not shown) during steering, so the presence of the thrust bearing 25 causes the lower spring seat 21 fixed to the cylinder 11 to rotate with the suspension spring 23. Both upper spring seats 22 can be rotated synchronously following the smooth movement. In the strut damper 10, a restraining cap 26, an upper spring seat 22, which will be described later, are formed around the intermediate diameter portion 12 </ b> B of the piston rod 12 and on the step portion with the large diameter portion 12 </ b> C following the intermediate diameter portion 12 </ b> B. A washer 27 and a thrust bearing 25 are inserted, and the thrust bearing 25 is interposed between the washer 27 and the washer 15 described above.
[0015]
Further, the strut damper 10 supports the back surface of the bump rubber 28 inserted so as to be firmly held around the large-diameter portion 12C of the piston rod 12 by the upper spring seat 22 via the restraining cap 26, and the end portion of the cylinder 11 The contraction end can be regulated by the collision between 11A and the bump rubber 28. The restraining cap 26 is a metal cup-shaped body such as iron, and restricts deformation of the bump rubber 28 so as to express the spring constant of the bump rubber 28.
[0016]
That is, the strut damper 10 expands and contracts so that the impact force received by the vehicle from the road surface is absorbed by the elastic force of the suspension spring 23. When the piston (not shown) moves up and down due to the expansion and contraction of the strut damper 10, the strut damper 10 absorbs the expansion and contraction vibration by the damping force generated by the oil passing through the orifice, the damping valve and the like provided in the piston. It suppresses promptly.
[0017]
However, the strut damper 10 includes a bellows-like dust cover 30 that covers a portion of the end 11A of the cylinder 11 through which the piston rod 12 passes. As shown in FIG. 3, the dust cover 30 is attached to the upper spring sheet 22 with the lower end 30 </ b> A attached to the lower spring sheet 21 and the upper end 30 </ b> B not in contact with the bump rubber 28. It has become.
[0018]
The lower end portion 30 </ b> A of the dust cover 30 is fitted and fixed to a spring rubber 21 </ b> A attached to the lower spring seat 21 (the spring rubber 21 </ b> A is held by the suspension spring 23 in a state of being placed on the lower spring seat 21). Further, the upper end portion 30B of the dust cover 30 is provided for the spring rubber 22A attached to the upper spring seat 22 (the spring rubber 22A is sandwiched between the suspension springs 23 under the upper spring seat 22) and the bump rubber 28. It is sandwiched between the outer peripheral surface of the restraining cap 26. Specifically, the upper end 30B of the dust cover 30 is attached to the restraining cap 26, extends the inner diameter side of the spring rubber 22A of the upper spring seat 22, and the upper spring seat 22 passes through the spring rubber 22A to cover the dust cover. In this state, 30 is pressed against the restraining cap 26.
[0019]
Therefore, the assembly procedure of the dust cover 30 in the strut damper 10 is performed as follows.
(1) The bump rubber 28 is inserted into the upper end portion of the large diameter portion 12C of the piston rod 12 of the damper assembly of the cylinder 11 and the piston rod 12.
[0020]
(2) A cover assembly in which the upper end edge of the spring rubber 21A is fitted into the lower end 30A of the dust cover 30 and the upper end 30B of the dust cover 30 is attached to the restraining cap 26 is placed on the upper part of the damper assembly. The spring rubber 21 </ b> A is placed on the lower spring seat 21, and the restraining cap 26 is positioned above the bump rubber 28.
[0021]
(3) Insert the suspension spring 23. The lower end portion of the suspension spring 23 is placed on the lower spring seat 21 via the spring rubber 21A.
[0022]
(4) Insert the upper spring seat 22 and the spring rubber 22A around the middle diameter portion 12B of the piston rod 12. Thereby, the spring rubber 22 </ b> A and the upper spring seat 22 are placed on the upper end portion of the suspension spring 23.
[0023]
(5) A washer 27 and a thrust bearing 25 are inserted on the upper spring seat 22 around the middle diameter portion 12B of the piston rod 12, and a washer 15 and a cover 16 are placed around the small diameter portion 12A of the piston rod 12. Then, the mount rubber 17 and the washer 18 are inserted and fastened with the nut 19 to complete the assembly.
[0024]
That is, the lower end portion 30A and the upper end portion 30B of the dust cover 30 are closed and fixed around the cylinder 11 and the piston rod 12, but the assembling property is simple.
[0025]
Therefore, according to the present embodiment, there are the following operations.
(1) The dust cover 30 has a lower end 30A attached to a lower spring seat 21 fixed to the outer periphery of the cylinder 11, and an upper end 30B to an upper spring seat 22 installed around the piston rod 12. Is attached. Accordingly, the dust cover 30 is closed at both the upper and lower end portions 30A and 30B, can prevent rainwater and dust from entering, and can seal the penetrating portion of the piston rod 12 at the end portion of the cylinder 11.
[0026]
(2) In the strut damper 10, the upper spring seat 22 and the suspension spring 23 together with the suspension bearing 23 are allowed to rotate the lower spring seat 21 fixed to the cylinder 11 in order to allow the cylinder 11 to rotate due to the steering steering force. It rotates following the movement. In other words, in the present invention, the lower spring seat 21 and the upper spring seat 22 are synchronously shared while the dust cover 30 is attached to the lower spring seat 21 and the upper spring seat 22 at both upper and lower ends. It rotates, and the dust cover 30 is not twisted. Since the upper end portion 30B of the dust cover 30 is set so as not to contact the bump rubber 28, when the upper end portion of the dust cover 30 is rotated together with the upper spring seat 22, any rotation from the bump rubber 28 is prevented. No resistance is given.
[0027]
(3) The lower end 30A of the dust cover 30 is fixed to the spring rubber 21A incidental to the lower spring seat 21, and the upper end 30B of the dust cover 30 is connected to the upper spring seat 22 and the restraining cap 26 for the bump rubber 28. It was made to be sandwiched between them. Thereby, the attachment structure of the dust cover 30 can be simplified, and the assembly property of the damper 10 can be simplified. At this time, the dust cover 30 is rotated by the upper spring sheet 22 together with the restraining cap 26 on the upper end portion 30B side, and the restraining cap 26 is in contact with the bump rubber 28, but the restraining cap 26 is made of metal such as iron. Since it is manufactured and has a small coefficient of friction, the bump rubber 28 can be rotated without any problem with little resistance to rotation.
[0028]
Although the embodiment of the present invention has been described in detail with reference to the drawings, 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. However, it is included in the present invention. For example, the upper end portion 30B of the dust cover 30 may be attached to the upper spring seat 22 by being sandwiched between the upper spring seat 22 and the spring rubber 22A. At this time, the damper 10 does not need to include the restraining cap 26 of the bump rubber 28.
[0029]
【The invention's effect】
As described above, according to the present invention, in the dust cover mounting structure of the strut damper, it is possible to seal the piston rod penetrating portion at the cylinder end with the dust cover and to prevent the dust cover from being twisted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing an entire strut damper.
FIG. 2 is a plan view of FIG.
FIG. 3 is an enlarged cross-sectional view of a main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Strut damper 11 Cylinder 12 Piston rod 13 Wheel side attachment member 14 Vehicle body side attachment member 21 Lower spring seat 21A Spring rubber 22 Upper spring seat
22A Spring rubber 23 Suspension spring 25 Thrust bearing 26 Restraint cap 28 Bump rubber 30 Dust cover 30A Lower end 30B Upper end

Claims (2)

The damper cylinder includes a wheel side mounting member, and the piston rod includes a vehicle body side mounting member and a thrust bearing.
A suspension spring is interposed between the lower spring seat fixed to the outer periphery of the cylinder and the upper spring seat that is installed around the piston rod and supported on the rear surface of the vehicle body side mounting member via a thrust bearing. ,
The bump rubber inserted on the outer periphery of the piston rod is supported on the back by the upper spring seat, and the contraction end of the damper can be regulated by the collision between the end of the cylinder and the bump rubber.
In the dust cover mounting structure of the strut damper comprising a dust cover that covers the piston rod penetrating portion at the end of the cylinder,
The lower end of the dust cover is fixed to the spring rubber attached to the lower spring seat ,
A dust cover mounting structure for a strut damper, wherein an upper end portion of the dust cover is sandwiched between a spring rubber attached to the upper spring seat and a restraining cap for a bump rubber . The dust cover mounting structure for a strut damper according to claim 1, wherein the restraining cap is made of metal .

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