JP2013072520A - Suspension device and cover member - Google Patents

Abstract

The present invention provides a technique capable of suppressing an air flow caused by a bump rubber being compressed from passing through a seal portion of an oil seal.
A bump stopper cap 200 that covers an outer periphery of a cylinder 100 between a cylinder 100 sealed with an oil seal 129 and a bump rubber 41 disposed on the outer periphery of the piston rod 20, and having a cylindrical shape. A side portion 210 and a cover portion 220 provided at one end portion in the center line direction of the side portion 210 and covering an opening portion at the one end portion, and the side portion 210 and the cover portion 220 are integrated. And the thickness of the side portion 210 is formed to be thinner than the thickness of the cover portion 220, and the side portion 210 is surrounded by the side portion 210, the cover portion 220, and the cylinder 100. And a groove 211 that communicates with a space outside the cylinder 100 and not surrounded by the side part 210 and the cover part 220.
[Selection] Figure 5

Description

  The present invention relates to a suspension device and a cover member.

For example, in a damper (suspension device) described in Patent Document 1, a bump rubber is press-fitted around a piston rod protruding from a damper tube, and a bump stopper cap is placed around a shaft seal portion through which the piston rod of the damper tube passes. The cap is provided with a contact plate that is fixed and a bump rubber abuts when the damper is compressed most.
Further, for example, in the hydraulic shock absorber described in Patent Document 2, a rod guide for a piston rod inserted into a cylinder and an oil seal are sandwiched between an upper end crimping portion of a damper tube and an upper end portion of the cylinder. Pressure is fixed.

JP 2010-223412 A JP 2010-151272 A

When the suspension system is compressed, if the air flow generated due to the compression of the bump rubber passes through the seal part of the cylinder sealing member (oil seal) and enters the cylinder, the pressure in the cylinder changes. There is a risk of adverse effects.
The present invention provides an apparatus capable of suppressing the air flow caused by the bump rubber being compressed from passing through the seal portion of the sealing member and protecting the sealing member. With the goal.

  For this purpose, the present invention provides a cylinder containing a liquid, a piston housed in the cylinder, a piston rod that supports the piston and partially protrudes from the cylinder, and the cylinder in the cylinder. A sealing member that seals the inside of the cylinder so that liquid does not leak from a portion from which the piston rod protrudes, a bump rubber disposed on the outer periphery of the piston rod protruding from the cylinder, and between the cylinder and the bump rubber A cover member that covers an outer periphery of the cylinder, the cover member being provided at a cylindrical side portion and one end portion in the center line direction of the side portion, and having an opening at the one end portion. And the side portion and the cover portion are formed so as to be continuous integrally and the thickness of the side portion is the same. Formed thinner than the thickness of the cover part, the side part includes a space surrounded by the side part and the cover part and the cylinder, and is surrounded by the side part and the cover part outside the cylinder. The suspension device is characterized in that a communication passage communicating with a space that is not formed is formed.

Here, the side portion of the cover member protrudes from the inner peripheral surface of the side portion to the outer peripheral side and from the other end portion in the center line direction of the side portion toward the one end portion in the center line direction. It is good to have the protrusion part extended in this, and the said communicating path is formed in the said protrusion part.
In addition, the side portion of the cover member has a convex portion that protrudes from the inner peripheral surface of the side portion toward the center side and determines a position in the center line direction of the cylinder, and the center line with respect to the convex portion The communication path may be formed by a through hole formed so as to communicate the inside and outside of the cover member in a direction intersecting the direction.
The convex portion of the side portion of the cover member may be formed over the entire circumference in the circumferential direction, and a plurality of the through holes may be formed in the circumferential direction.
Or the said convex part of the said side part of the said cover member is formed in multiple numbers in the circumferential direction, and the said through-hole is good to be formed in each of the said convex part.
The cover member may be formed by rotational molding.

  From another point of view, the present invention provides an outer periphery of the cylinder between a cylinder filled with liquid and sealed with a sealing member and a bump rubber disposed on the outer periphery of the piston rod protruding from the cylinder. A cover member for covering, having a cylindrical side portion and a cover portion provided at one end portion in the center line direction of the side portion and covering an opening at the one end portion, and the side And the cover portion are formed so as to be continuous integrally, and the thickness of the side portion is formed to be thinner than the thickness of the cover portion. The side portion includes the side portion and the cover. A cover member is formed in which a communication path is formed to communicate a space surrounded by the cylinder and the cylinder and a space outside the cylinder and not surrounded by the side and the cover. is there

Here, the side portion protrudes from the inner peripheral surface of the side portion to the outer peripheral side and extends from the other end portion in the center line direction of the side portion to the one end side in the center line direction. It is preferable that the communication path is formed by the protrusion.
Further, the side portion has a convex portion that protrudes from the inner peripheral surface of the side portion toward the center side and determines the position of the cylinder in the center line direction, and intersects the convex portion in the center line direction. The communication path may be formed by a through hole formed so as to communicate the inside and the outside in the direction.
The convex portion of the side portion is formed over the entire circumference in the circumferential direction, and a plurality of the through holes may be formed in the circumferential direction.
Or the said convex part of the said side part is formed in multiple numbers in the circumferential direction, and the said through-hole is good to be formed in each of the said convex part.
And it is good to shape | mold a cover member by the rotational molding process shape | molded by a rotational molding process.

  According to the present invention, it is possible to suppress the air flow generated due to the compression of the bump rubber from passing through the sealing portion of the sealing member and to protect the sealing member.

It is a figure which shows schematic structure of the suspension apparatus which concerns on embodiment. It is a figure which shows schematic structure of a hydraulic shock absorber. It is a figure which shows the flow of the oil at the time of the compression stroke of a hydraulic shock absorber. It is a figure which shows the flow of the oil at the time of the expansion stroke of a hydraulic shock absorber. (A) is a figure which shows the contraction state from which the length of the piston rod which protrudes from the cylinder becomes the shortest, (b) shows the expansion state from which the length of the piston rod which protrudes from the cylinder becomes the longest FIG. It is a figure which shows schematic structure of the bump stopper cap which concerns on a 1st Example. It is a figure which shows schematic structure of the bump stopper cap which concerns on another form. It is a figure which shows schematic structure of the bump stopper cap which concerns on a 2nd Example. It is a figure which shows schematic structure of the bump stopper cap which concerns on a 3rd Example.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a schematic configuration of a suspension device 1 according to an embodiment.
As shown in FIG. 1, the suspension device 1 includes a hydraulic shock absorber 10 which will be described later, and a spring 30 disposed outside the cylinder 100 and the piston rod 20 of the hydraulic shock absorber 10. The piston rod 20 is a cylindrical member, and a piston 141 (see FIG. 2), which will be described later, is attached to one end side in the center line direction of the cylinder, and a nut 21 is provided on the other end side in the center line direction. It is attached. Hereinafter, the center line direction of the cylinder of the piston rod 20 may be simply referred to as “center line direction”.

  The suspension device 1 is attached to the outer periphery of the cylinder 100 and supports the lower end portion of the spring 30, and the suspension device 1 is attached to the outer periphery on the other end side in the center line direction of the piston rod 20. And an upper spring seat 32 that supports the portion. A lower seat rubber 35 is interposed between the lower end portion of the spring 30 and the lower spring seat 31, and an upper seat rubber 36 is interposed between the upper end portion of the spring 30 and the upper spring seat 32.

The suspension device 1 includes a wheel side mounting portion 40 provided at a lower portion of the cylinder 100. On the other hand, a bolt 33 for attaching the suspension device 1 to the vehicle body is attached to the upper spring seat 32.
The suspension device 1 also includes a bump rubber 41 that is press-fitted into the outer periphery of the piston rod 20 protruding from the cylinder 100, and a bump rubber cup 42 that is disposed on the outer periphery of the bump rubber 41.

  The suspension device 1 has an upper end mounted on the outer periphery of the bump rubber cup 42 and a lower end mounted on the lower spring seat 31, and a bellows-like dust cover 50 covering the outer periphery of the cylinder 100 and the piston rod 20 therebetween. It has. The lower end of the dust cover 50 is fastened to the lower spring seat 31 with, for example, a tightening ring (not shown) and screws.

  Further, the suspension device 1 is arranged in the vertical direction on the upper end side of the piston rod 20, and is arranged inside a plurality of (two in this embodiment) mount rubbers 61 that absorb vibration and inside the plurality of mount rubbers 61. The cylindrical mount collar 62, and an upper washer 63 and a lower washer 64 that sandwich the plurality of mount rubbers 61 from above and below are provided. The upper mount rubber 61 among the plurality of mount rubbers 61 is inserted into a recess formed in the upper spring seat 32 so as to be recessed from the upper end thereof. The lower mount rubber 61 is covered at its upper end and outer periphery by a mount rubber cup 65 disposed below the upper spring seat 32.

Next, the hydraulic shock absorber 10 will be described in detail.
FIG. 2 is a diagram illustrating a schematic configuration of the hydraulic shock absorber 10.
As shown in FIG. 2, the hydraulic shock absorber 10 includes a thin-cylindrical outer cylinder 111, a thin-cylindrical inner cylinder 112 housed in the outer cylinder 111, and one end in the center line direction of the outer cylinder 111. A cylinder 100 having a bottom lid 113 that closes the part.

  The hydraulic shock absorber 10 includes a piston 141 inserted into the inner cylinder 112 so as to be movable in the center line direction, and a piston at one end portion (lower end portion in FIG. 2) extending in the center line direction and in the center line direction. 141, and a rod guide 125 that is arranged inside the outer cylinder 111 and guides the piston rod 20. The piston 141 is in contact with the inner periphery of the inner cylinder 112, and a space in which the liquid (oil in the present embodiment) in the inner cylinder 112 is sealed is closer to one end side in the center line direction than the piston 141. The first oil chamber Y1 and the second oil chamber Y2 on the other end side in the center line direction than the piston 141 are divided.

The hydraulic shock absorber 10 includes a bump stopper cap 200 that slides the piston rod 20 and is attached to the other end of the outer cylinder 111 in the center line direction. The bump stopper cap 200 will be described in detail later.
Further, the hydraulic shock absorber 10 is provided inside the bump stopper cap 200 and on the opposite side of the piston 141 with respect to the rod guide 125, so that liquid leaks in the cylinder 100 and foreign matter enters the cylinder 100. An oil seal 129 is provided as an example of a sealing member that prevents the above.
The hydraulic shock absorber 10 includes a first valve device 130 disposed at one end of the inner cylinder 112 in the center line direction and a second valve disposed at one end of the piston rod 20 in the center line direction. Device 140.
Below, each component is demonstrated in detail.

  In the cylinder 100, the length of the outer cylinder 111 in the center line direction is longer than the length of the inner cylinder 112, and the inner cylinder 112 is disposed concentrically with the outer cylinder 111. That is, one end of the inner cylinder 112 in the center line direction is centered on the outer cylinder 111 via a valve body 131 and a bottom cover 113, which will be described later, which are one of the components constituting the first valve device 130. Supported at one end in the direction. On the other hand, the other end of the inner cylinder 112 in the center line direction is supported by the rod guide 125. Thus, the inner cylinder 112 is arranged concentrically with the outer cylinder 111 so that the gap between the outer periphery of the inner cylinder 112 and the inner periphery of the outer cylinder 111 is constant in the center line direction. A reservoir chamber R is formed by the outer periphery of the inner cylinder 112 and the inner periphery of the outer cylinder 111. In the hydraulic shock absorber 10 according to the present embodiment, the interior of the reservoir chamber R is divided into an oil chamber filled with oil and a gas chamber filled with air, inert gas, and the like. As shown in FIG. 2, the first valve device 130 separates the first oil chamber Y1 and the reservoir chamber R by a valve body 131 described later.

In addition, the bottom lid 113 is attached to one end portion in the center line direction of the outer cylinder 111, and the other end portion in the center line direction of the outer cylinder 111 is closed by roll caulking in the inner diameter direction. The position of the inner cylinder 112 in the center line direction is determined via the rod guide 125, the first valve device 130, and the like.
In FIG. 2, the convex portion for fixing the lower spring seat 31 and the wheel side attachment portion 40 provided in the outer cylinder 111 is omitted.

The piston 141 is a cylindrical member having a plurality of oil passages formed in the center line direction, and constitutes a part of the second valve device 140. The second valve device 140 including the piston 141 will be described in detail later.
The piston rod 20 is a solid member, a cylindrical rod portion 20a, a one-side attachment portion 20b for attaching the piston 141 or the like to one end portion in the center line direction, and the other end in the center line direction. And the other side mounting portion 20c for mounting the piston rod 20 to the vehicle body. A spiral groove is cut on the outer surface of the tip of the one side attachment portion 20b and the other side attachment portion 20c to form a male screw, which functions as a bolt.

Next, the first valve device 130 and the second valve device 140 will be described.
The first valve device 130 includes a valve body 131 having a plurality of oil passages formed in the center line direction, and one of the plurality of oil passages formed in the valve body 131 in the center line direction. And a second valve 133 that closes the other end in the center line direction of a part of the plurality of oil passages formed in the valve body 131. . Further, the first valve device 130 includes a bolt body 134 and a nut 135 for unitizing the valve body 131, the first valve 132, the second valve 133, and the like, which are configured separately. The first valve device 130 also includes a washer 136 disposed between the head of the bolt 134 and the first valve 132, and a washer 137 disposed between the nut 135 and the second valve 133. .

The valve body 131 includes a disk-shaped disk-shaped part 311 and a cylindrical-shaped cylindrical part 312 extending in the center line direction from the radially outermost part of the disk-shaped part 311, and is closed in the cylinder 100. Partition the created space.
The disc-shaped portion 311 includes a bolt hole 311a formed in the center line direction so as to pass the shaft portion 134a of the bolt 134, and a first portion formed in the center line direction at a portion radially outside the bolt hole 311a. An oil passage 311b and a second oil passage 311c formed in the center line direction are formed in a portion outside the first oil passage 311b in the radial direction. A plurality of (four in the present embodiment) first oil passages 311b and second oil passages 311c are formed at equal intervals in the circumferential direction, and communicate with the first oil chamber Y1 and the reservoir chamber R. Functions as a passage. However, when viewed from the center in the radial direction, the first oil passage 311b and the second oil passage 311c are not formed in the same direction, and the first oil passage 311b and the second oil passage 311c are circumferential. It is formed at a position relatively displaced in the direction. The opening ends of the first oil passage 311b and the second oil passage 311c are formed at positions lower than the end faces in the center line direction of the disc-like portion 311. In other words, the region where the first oil passage 311b and the second oil passage 311c are formed is recessed in a ring shape at one end of the disc-like portion 311 in the center line direction. The other end portion of the disc-shaped portion 311 in the center line direction is recessed in a ring shape in the region where the first oil passage 311b and the second oil passage 311c are formed.

The disk-shaped portion 311 has a stepped portion that is recessed from the end surface on the center side in the radial direction at the outermost diameter portion of the other end portion in the center line direction. The step portion is in contact with one end portion of the inner cylinder 112 in the center line direction, thereby determining the position of the inner cylinder 112 in the center line direction.
The cylindrical portion 312 has a plurality (four in this embodiment) of concave portions 312a that are recessed from one end surface in the center line direction at equal intervals in the circumferential direction. The recess 312a communicates the inside of the cylindrical portion 312 with the reservoir chamber R.

The first valve 132 is a disk-shaped member in which a bolt hole through which the shaft portion of the bolt 134 passes is formed. The outer diameter of the first valve 132 is set to a size that closes the first oil passage 311b and opens the second oil passage 311c.
The second valve 133 is a disk-shaped member in which a bolt hole through which the shaft portion of the bolt 134 passes is formed. And the outer diameter of the 2nd valve | bulb 133 is set to the magnitude | size which plugs the 2nd oil path 311c. The second valve has a plurality of (9 in the present embodiment) oil holes at equal intervals in the circumferential direction at positions corresponding to the first oil passages 311b when viewed from the center in the radial direction. Is formed.

The washer 136 is a disk-shaped member in which a bolt hole through which the shaft portion of the bolt 134 passes is formed. By disposing the washer 136 between the head of the bolt 134 and the first valve 132, a gap is generated between the head of the bolt 134 and the first valve 132 by the thickness of the washer 136. .
The washer 137 is a disk-shaped member in which a bolt hole through which the shaft portion of the bolt 134 passes is formed. By disposing the washer 136 between the head of the nut 135 and the second valve 133, a gap is generated between the nut 135 and the second valve 133 by the thickness of the washer 137.

  The second valve device 140 includes the above-described piston 141, a first valve 142 that closes one end portion in the center line direction of some of the oil passages formed in the piston 141, and the piston 141. A second valve 143 that closes the other end in the center line direction of a part of the plurality of oil passages, and a washer 144 disposed between the piston rod 20 and the second valve 143. And. In addition, the second valve device 140 includes a nut 145 for unitizing the piston 141, the first valve 142, the second valve 143, and the washer 144, which are separately formed together with the one side mounting portion 20b of the piston rod 20. I have. A washer 146 is disposed between the nut 145 and the first valve 142.

  The piston 141 has a bolt hole 141a formed in the center line direction so as to pass the one side mounting portion 20b of the piston rod 20, and a first hole formed in the center line direction at a portion radially outside the bolt hole 141a. A first oil passage 141b and a second oil passage 141c formed in the center line direction are formed in a radially outer portion than the first oil passage 141b. A plurality (four in the present embodiment) of the first oil passage 141b and the second oil passage 141c are formed at equal intervals in the circumferential direction, and the first oil chamber Y1 and the second oil chamber Y2 communicate with each other. Functions as a communication path. However, when viewed from the center in the radial direction, the first oil passage 141b and the second oil passage 141c are not formed in the same direction, and the first oil passage 141b and the second oil passage 141c are circumferential. It is formed at a position relatively displaced in the direction. The opening ends of the first oil passage 141b and the second oil passage 141c are formed at positions lower than the end faces in the center line direction. In other words, at one end portion of the piston 141 in the center line direction, regions where the first oil passage 141b and the second oil passage 141c are formed are recessed in a ring shape. Moreover, the area | region in which the 1st oil path 141b and the 2nd oil path 141c are formed is dented in the other end part of the centerline direction in the piston 141 at ring shape, respectively.

The first valve 142 is a disk-shaped member in which a bolt hole through which the one side mounting portion 20b of the piston rod 20 is passed is formed. And the outer diameter of the 1st valve | bulb 142 is set to the magnitude | size which plugs the 1st oil path 141b, and the magnitude | size which open | releases the 2nd oil path 141c.
The second valve 143 is a disk-shaped member in which a bolt hole through which the one side mounting portion 20b of the piston rod 20 is passed is formed. The outer diameter of the second valve 143 is set to a size that closes the second oil passage 141c. The second valve 143 has a plurality of (9 in the present embodiment) oil holes at equal intervals in the circumferential direction at positions corresponding to the first oil passages 141b when viewed from the center in the radial direction. Is formed.

The washer 144 is a disk-shaped member in which a bolt hole through which the one side mounting portion 20b of the piston rod 20 passes is formed. By disposing the washer 144 between the one side mounting portion 20b of the piston rod 20 and the second valve 143, a gap is formed between the piston rod 20 and the second valve 143 by the thickness of the washer 144. Cause it to occur.
The washer 146 is a disk-shaped member in which a bolt hole through which the one side mounting portion 20b of the piston rod 20 passes is formed. By disposing the washer 144 between the nut 145 of the piston rod 20 and the first valve 142, a gap is generated between the nut 145 and the first valve 142 by the thickness of the washer 146.

Next, the operation of the hydraulic shock absorber 10 configured as described above will be described.
First, the operation during the compression stroke of the hydraulic shock absorber 10 will be described.
FIG. 3 is a diagram illustrating the flow of oil during the compression stroke of the hydraulic shock absorber 10.
When the piston rod 20 moves to one end side in the center line direction (downward in FIG. 3) with respect to the cylinder 100 as indicated by a white arrow, the oil in the first oil chamber Y1 is moved by the movement of the piston 141. As a result, the pressure on the lower surface of the second valve device 140 increases, and a high pressure acts on the second oil passage 141c (see FIG. 3) of the second valve device 140. As a result, the second valve 143 that closes the second oil passage 141c is opened, and the oil passes through the second oil passage 141c and the second oil chamber Y2 above the second valve device 140 as shown by the arrow A in FIG. Flow into. The flow of oil from the first oil chamber Y1 to the second oil chamber Y2 is throttled by the second valve 143 and the second oil passage 141c, and a damping force during the compression stroke of the hydraulic shock absorber 10 is obtained.

  Further, the pressure in the first oil chamber Y1 increased by the movement of the piston rod 20 toward the one end in the center line direction acts on the first oil passage 311b of the first valve device 130 and closes the first oil passage 311b. 1 Open the valve 132. The oil in the first oil chamber Y1 is formed between the inner cylinder 112 and the outer cylinder 111 through the first oil passage 311b and the recess 312a of the valve body 131 as shown by an arrow B in FIG. Into the reservoir chamber R. The oil flow from the first oil chamber Y1 to the reservoir chamber R is throttled by the first valve 132 and the first oil passage 311b to obtain a damping force during the compression stroke of the hydraulic shock absorber 10.

Next, the behavior during the expansion stroke of the hydraulic shock absorber 10 will be described.
FIG. 4 is a diagram illustrating the flow of oil during the extension stroke of the hydraulic shock absorber 10.
When the piston rod 20 moves to the other end side in the center line direction (upward in FIG. 4) with respect to the cylinder 100 as indicated by a white arrow, the volume of oil is insufficient in the first oil chamber Y1. As a result, negative pressure is obtained. Thereby, the oil in the second oil chamber Y2 passes through the first oil passage 141b of the second valve device 140, and the first valve 142 that closes the first oil passage 141b is opened, as indicated by an arrow C in FIG. , Flows into the first oil chamber Y1. The oil flow from the second oil chamber Y2 to the first oil chamber Y1 is throttled by the first valve 142 and the first oil passage 141b of the second valve device 140, and the damping force during the expansion stroke of the hydraulic shock absorber 10 Get. As described above, the extension side damping force is generated in the first valve 142 and the first oil passage 141b of the second valve device 140, and the extension side damping force is the rigidity of the first valve 142, the diameter of the first oil passage 141b, and the like. It depends on.

  When the piston rod 20 moves in the direction of the white arrow in FIG. 4, the oil in the reservoir chamber R passes through the recess 312a and the second oil passage 311c of the valve body 131 of the first valve device 130, and this second oil. The second valve 133 that closes the passage 311c is opened, and flows into the first oil chamber Y1 as indicated by an arrow D in FIG. The oil flow from the reservoir chamber R to the first oil chamber Y1 is throttled by the second valve 133 and the second oil passage 311c of the first valve device 130 to obtain a damping force during the expansion stroke of the hydraulic shock absorber 10. .

FIG. 5A is a diagram showing a contracted state in which the length of the piston rod 20 protruding from the cylinder 100 is the shortest, and FIG. 5B is a length of the piston rod 20 protruding from the cylinder 10. It is a figure which shows the elongation state from which becomes the longest.
The suspension device 1 configured as described above changes to a contracted state shown in FIG. 5A and an extended state shown in FIG. 5B, and absorbs an impact from a road surface by a spring 30 or a hydraulic shock absorber. By suppressing the expansion and contraction vibration of the spring 30 at 10, the function as a shock absorber that does not transmit the unevenness of the road surface to the vehicle body and the function of pressing the vehicle body against the road surface are achieved. This improves the ride comfort and handling stability of the vehicle.

Next, the bump stopper cap 200 will be described in detail.
<First embodiment>
FIG. 6 is a diagram showing a schematic configuration of the bump stopper cap 200 according to the first embodiment. 6A is a perspective view, and FIG. 6B is a cross-sectional view of the VIB-VIB portion of FIG. 6A. FIG. 6C is a view of the bump stopper cap 200 as viewed from below. FIG. 6B shows a part of the outer cylinder 111 and the piston rod 20 of the cylinder 100.
The bump stopper cap 200 has a cylindrical side portion 210 having a basic shape, a cover portion 220 provided at an end portion on the bump rubber 41 side in the center line direction of the side portion 210, and covering an opening portion of the end portion, It has. An end portion of the side portion 210 opposite to the cover portion 220 (bump rubber 41) side in the center line direction is open, and the cylinder 100 is inserted from the opening portion.

  The side portion 210 has a basic cylindrical shape, and its inner peripheral surface is set to a size that allows the outer peripheral surface of the outer cylinder 111 of the cylinder 100 to be press-fitted. That is, the inner diameter of the inner peripheral surface of the side portion 210 and the outer diameter of the outer peripheral surface of the outer cylinder 111 of the cylinder 100 are set to a size that can be fitted with an interference fit. A plurality (four in the present embodiment) of grooves 211 protruding from the inner peripheral surface of the side portion 210 to the outer peripheral side are formed at equal intervals in the circumferential direction. The groove 211 extends in the center line direction from the open end in the center line direction to the end on the cover 220 side to the front of the cover 220.

The thickness of the cover portion 220 is formed to be thicker than the thickness of the side portion 210 so as to withstand the collision force with the bump rubber 41 when the suspension device 1 is compressed most. In other words, the thickness of the side part 210 is formed thinner than the thickness of the cover part 220. The cover 220 is flat at both ends in the direction of the center line, and a through hole 221 is formed in the center of the cover 220 so as to pass through the piston rod 20 in the direction of the center line.
The cover part 220 is connected to the side part 210 via the curved surface 230.

  In the bump stopper cap 200 having the shape described above, the cylinder 100 is press-fitted from the opening side of the side portion 210 and covers the outer periphery of the end portion of the outer cylinder 111 on the bump rubber 41 side. When the cylinder 100 is press-fitted into the bump stopper cap 200, the end portion on the cover portion 220 side in the groove 211 of the side portion 210 is disposed above the end portion on the bump rubber 41 side of the outer cylinder 111 of the cylinder 100. Press-fit. As a result, the space inside the bump stopper cap 200 where the outer cylinder 111 is not press-fitted and the external space of the bump stopper cap 200 communicate with each other via the groove 211 of the side portion 210.

  Since the bump stopper cap 200 according to the first embodiment having the shape as described above and attached to the cylinder 100 as described above has a bowl shape, the bump rubber 41 side of the outer cylinder 111 of the cylinder 100 is on the side of the bump rubber 41. The outer periphery of the end portion can be covered, and the thickness of the cover portion 220 is thicker than the thickness of the side portion 210, so that it is possible to withstand the collision force during the maximum compression of the suspension device 1. In addition, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 and the external space of the bump stopper cap 200 communicate with each other via the groove 211 of the side portion 210, when the suspension device 1 is compressed, An air flow generated due to the compression of the bump rubber 41 passes through the through hole 221 and the groove 211 of the bump stopper cap 200 and is discharged to the outside of the bump stopper cap 200. As a result, when the bump stopper cap 200 according to the present embodiment is used, the air flow generated due to the compression of the bump rubber 41 when the suspension device 1 is compressed passes through the seal portion of the oil seal 129 and the cylinder. It becomes possible to suppress entering into the inside of 100. Further, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 is large, it is possible to protect the oil seal 129, such as making it difficult for dust to enter the oil seal 129.

  Here, as a comparative example of the bump stopper cap 200, a thin-walled container-like part that houses the cylinder 100 inside, and a collision between the container-like part and the bump rubber 41 and the suspension device 1 during compression are arranged. Consider an object composed of disk-shaped parts for receiving force. In this comparative example, since it is composed of two parts, the number of parts is increased and the number of assembling steps is increased as compared with the form composed of one part. Moreover, when the assembly direction with respect to a vessel-shaped part is defined for the disk-shaped part, the disk-shaped part may be erroneously assembled in the wrong direction.

  The bump stopper cap 200 according to the first embodiment is a member that realizes the functions of the vessel-shaped component and the disk-shaped component in the configuration of this comparative example with one component. Therefore, in the suspension device 1 according to the present embodiment, the number of parts can be reduced, the number of assembling steps can be reduced, and no erroneous assembly is performed.

In addition, as described above, the bump stopper cap 200 according to the first embodiment makes the thickness of the cover portion 220 larger than the thickness of the side portion 210, and the side portion 210 and the cover portion 220 have the curved surface 230. Connected through. Therefore, the bump stopper cap 200 can be manufactured by pressing a sheet metal. For example, the bump stopper cap 200 can be manufactured by deep drawing a single steel plate. Further, since the thickness of the side portion 210 is thinner than the thickness of the cover portion 220, the groove 211 can be easily formed in the side portion 210 by plastic deformation.
Thus, by manufacturing the bump stopper cap 200 by pressing (deep drawing), the number of parts can be reduced and the number of assembly steps can be reduced without impairing productivity as compared with the configuration of the comparative example. Can be reduced.

  Further, by pressing the bump stopper cap 200, the side part 210 and the cover part 220 are formed so as to be integrated continuously via the curved surface 230. Therefore, the bump stopper cap 200 that has been press-processed (deep-drawn) remains, for example, more than a product that has been finished into one part by welding a disk-like part to a container-like part of the configuration of the comparative example. The stress can be reduced, and the proof strength of the suspension device 1 against the collision force at the time of maximum compression is high.

  In addition, in order to make it the shape which can endure the impact force at the time of the most compression of the suspension apparatus 1 while making the vessel-shaped component and disk-shaped component in the structure of a comparative example into one component, the vessel shape with uniform thickness It is also conceivable to use a member having the same thickness as that of the cover 220 of the bump stopper cap 200 according to the present embodiment. However, in such a member, the thickness of the side portion (the portion corresponding to the side portion 210 of the bump stopper cap 200 according to the present embodiment) is also thicker, and therefore, compared to the bump stopper cap 200 according to the first example. , Will increase the weight. Further, it is difficult to form the groove 211 in the side portion 210 by plastic deformation. Therefore, the bump stopper cap 200 according to the present embodiment can reduce the number of parts without increasing the weight.

  It is also possible to manufacture the bump stopper cap 200 according to the first embodiment by cutting. Further, it is possible to manufacture by using a rotational molding process in which a plastic member is deformed by applying pressure while rotating a vessel-like member having a uniform thickness (for example, a vessel-like component having a configuration of a comparative example). Even if the bump stopper cap 200 manufactured by cutting or rotational molding is used, the number of parts can be reduced and the number of assembling steps can be reduced as compared with the configuration of the comparative example without increasing the weight. . In addition, it is possible to suppress erroneous assembly. A plate-shaped member having a uniform wall thickness is formed by pressing (deep drawing) a single steel plate, and then the thickness of the cover portion 220 is reduced to the thickness of the side portion 210 using rotational molding. When making it thicker than the thickness, either the order of the step of forming the groove 211 of the side portion 210 and the step of making the thickness of the cover portion 220 thicker than the thickness of the side portion 210 may be first.

FIG. 7 is a diagram showing a schematic configuration of a bump stopper cap 200 according to another embodiment. FIG. 7A is a perspective view, and FIG. 7B is a cross-sectional view of the VIIB-VIIB portion of FIG. 7A. FIG. 7C is a view of the bump stopper cap 200 as viewed from below.
As shown in FIG. 7, the radially outermost portion 223 in the cover portion 220 of the bump stopper cap 200 may protrude outward in the radial direction from the outer peripheral surface 213 of the side portion 210. Even with such a shape, the number of parts can be reduced, and the number of assembly steps can be reduced.

<Second embodiment>
FIG. 8 is a diagram showing a schematic configuration of a bump stopper cap 200 according to the second embodiment. FIG. 8A is a perspective view, and FIG. 8B is a cross-sectional view of the VIIIB-VIIIB portion of FIG. 8A. FIG. 8C is a cross-sectional view of a state in which the bump stopper cap 200 according to the second embodiment is mounted on the cylinder 100. In FIG. 8B, a part of the outer cylinder 111 and the piston rod 20 of the cylinder 100 are shown.
The bump stopper cap 200 according to the second embodiment is different from the bump stopper cap 200 according to the first embodiment in the shape of the side portion 210 and the other shapes are the same. Only the different points will be described below.

  On the side portion 210 of the bump stopper cap 200 according to the second embodiment, convex portions 215 protruding from the inner peripheral surface of the side portion 210 toward the center are formed on the entire circumference in the circumferential direction. The convex portion 215 is formed at a position between the open end in the center line direction and the end on the cover 220 side. The convex portion 215 has a communication hole 215a formed in a direction intersecting the center line direction from a position that protrudes most inwardly in the convex portion 215 and communicating the inner side and the outer side of the bump stopper cap 200 in the circumferential direction. A plurality (four in this embodiment) are formed at equal intervals.

  In the bump stopper cap 200 according to the second embodiment having such a shape, the cylinder 100 is press-fitted from the opening portion side of the side portion 210 and covers the outer periphery of the end portion of the outer cylinder 111 on the bump rubber 41 side. When the cylinder 100 is press-fitted into the bump stopper cap 200, the cylinder 100 is press-fitted until the end of the outer cylinder 111 of the cylinder 100 on the bump rubber 41 side abuts against the convex part 215 of the side part 210. That is, the opening side portion of the convex portion 215 functions as a portion that receives the end of the outer cylinder 111 on the bump rubber 41 side, and the space inside the bump stopper cap 200 where the outer cylinder 111 is not press-fitted, The external space of the bump stopper cap 200 communicates through the communication hole 215a.

  The bump stopper cap 200 according to the second embodiment, which has the shape as described above and is attached to the cylinder 100 as described above, has a bowl shape, and therefore has a bump rubber 41 side in the outer cylinder 111 of the cylinder 100. The outer periphery of the end portion can be covered, and the thickness of the cover portion 220 is thicker than the thickness of the side portion 210, so that it is possible to withstand the collision force during the maximum compression of the suspension device 1. In addition, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 and the outer space of the bump stopper cap 200 communicate with each other through the communication hole 215a of the side portion 210, the suspension device 1 is compressed. The air flow generated due to the compression of the bump rubber 41 passes through the through hole 221 and the communication hole 215a of the bump stopper cap 200 and is discharged to the outside of the bump stopper cap 200. As a result, when the bump stopper cap 200 according to the second embodiment is used, the air flow caused by the compression of the bump rubber 41 when the suspension device 1 is compressed passes through the seal portion of the oil seal 129. It is possible to suppress entry into the cylinder 100. Further, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 is large, it is possible to protect the oil seal 129, such as making it difficult for dust to enter the oil seal 129.

  The bump stopper cap 200 according to the second embodiment is a member that realizes the functions of the vessel-shaped component and the disk-shaped component in the configuration of the comparative example described above with one component. Therefore, in the suspension device 1 according to the embodiment, the number of parts can be reduced, the number of assembling steps can be reduced, and no erroneous assembly is performed.

  In the bump stopper cap 200 according to the second embodiment, the side portion 210 and the cover portion 220 are connected via the curved surface 230. Therefore, the bump stopper cap 200 according to the second embodiment can be manufactured by the following method. That is, first, a sheet metal is press-formed (for example, a single steel plate is deep-drawn) and formed into a container shape, and this container-shaped object is plastically deformed by applying pressure from the outside while rotating the container-shaped object. Is used to form the convex portion 215 of the side portion 210, and then the communication hole 215a is formed by cutting.

  In the above manufacturing process, the thickness of the cover portion 220 may be made larger than the thickness of the side portion 210 at the time of press working (for example, deep drawing) at the time of forming a vessel-shaped object. Thereby, when forming the convex part 215, since the thickness of the side part 210 is thinner than the thickness of the cover part 220, it is possible to easily form the convex part 215 by plastic deformation. Become. Alternatively, after forming a vessel-like object by press working (for example, deep drawing), the thickness of the cover portion 220 is made larger than the thickness of the side portion 210 by using rotational molding, and then rotational molding is performed. You may form the convex part 215 using. Even in such a case, the convex portion 215 can be easily formed by plastic deformation.

  By manufacturing the bump stopper cap 200 by the above-described manufacturing method, the side portion 210 and the cover portion 220 are formed so as to be integrated continuously via the curved surface 230. Therefore, for example, the residual stress can be made smaller than the one finished in one part by welding the disk-like part to the container-like part of the configuration of the above comparative example, and the maximum compression of the suspension device 1 The resistance to collision force at times is high.

The bump stopper cap 200 according to the second embodiment is a member having a uniform thickness (for example, the above-mentioned device-like component), and the thickness of the bump stopper cap 200 is the same as the thickness of the cover 220. The bump stopper cap 200 according to the first embodiment is lighter than the bump stopper cap 200 according to the first embodiment.
It is also possible to manufacture all the bump stopper caps 200 according to the second embodiment by cutting. Even when the bump stopper cap 200 manufactured by cutting is used, the number of parts can be reduced as compared with the configuration of the comparative example without increasing the weight, and the number of assembling steps can be reduced. In addition, it is possible to suppress erroneous assembly.

<Third embodiment>
FIG. 9 is a diagram showing a schematic configuration of a bump stopper cap 200 according to the third embodiment. 9A is a perspective view, and FIG. 9B is a cross-sectional view of the IXB-IXB portion of FIG. 9A. FIG. 9C is a cross-sectional view of a state where the bump stopper cap 200 according to the third embodiment is mounted on the cylinder 100. FIG. 9B shows a part of the outer cylinder 111 and the piston rod 20 of the cylinder 100.
The bump stopper cap 200 according to the third embodiment is different from the bump stopper cap 200 according to the second embodiment in the shape of the side portion 210, and the other shapes are the same. Only the different points will be described below.

  The side portion 210 of the bump stopper cap 200 according to the third embodiment has a plurality of protrusions 217 protruding from the inner peripheral surface of the side portion 210 toward the center side at equal intervals in the circumferential direction (four in this embodiment). One) is formed. The protrusion 217 is formed at a position between the open end in the center line direction and the end on the cover 220 side. The protrusion 217 is formed with a communication hole 217 a that is formed in a direction intersecting the center line direction from the position of the protrusion 217 that protrudes most inside, and that connects the inside and the outside of the bump stopper cap 200. .

  In the bump stopper cap 200 according to the third embodiment having such a shape, the cylinder 100 is press-fitted from the opening portion side of the side portion 210 and covers the outer periphery of the end portion of the outer cylinder 111 on the bump rubber 41 side. When the cylinder 100 is press-fitted into the bump stopper cap 200, the cylinder 100 is press-fitted until the end of the outer cylinder 111 of the cylinder 100 on the bump rubber 41 side abuts against the protrusion 217 of the side part 210. That is, the portion of the protrusion 217 on the opening side functions as a portion for receiving the end portion of the outer cylinder 111 on the bump rubber 41 side, and the space inside the bump stopper cap 200 where the outer cylinder 111 is not press-fitted, and the bump The external space of the stopper cap 200 communicates through the communication hole 217a.

  The bump stopper cap 200 according to the third embodiment, which has the shape as described above and is attached to the cylinder 100 as described above, has a bowl shape, and therefore has a bump rubber 41 side in the outer cylinder 111 of the cylinder 100. The outer periphery of the end portion can be covered, and the thickness of the cover portion 220 is thicker than the thickness of the side portion 210, so that it is possible to withstand the collision force during the maximum compression of the suspension device 1. Further, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 and the external space of the bump stopper cap 200 communicate with each other via the communication hole 217a of the side portion 210, the suspension device 1 is compressed. The air flow generated due to the compression of the bump rubber 41 passes through the through hole 221 and the communication hole 215a of the bump stopper cap 200 and is discharged to the outside of the bump stopper cap 200. As a result, when the bump stopper cap 200 according to the second embodiment is used, the air flow caused by the compression of the bump rubber 41 when the suspension device 1 is compressed passes through the seal portion of the oil seal 129. It is possible to suppress entry into the cylinder 100. Further, since the space where the outer cylinder 111 is not press-fitted inside the bump stopper cap 200 is large, it is possible to protect the oil seal 129, such as making it difficult for dust to enter the oil seal 129.

  The bump stopper cap 200 according to the third embodiment is a member that realizes the functions of the vessel-shaped component and the disk-shaped component in the configuration of the comparative example described above with one component. Therefore, in the suspension device 1 according to the embodiment, the number of parts can be reduced, the number of assembling steps can be reduced, and no erroneous assembly is performed.

  In the bump stopper cap 200 according to the third embodiment, the side part 210 and the cover part 220 are connected via the curved surface 230. Therefore, it is possible to manufacture the bump stopper cap 200 according to the third embodiment by the following method. That is, first, a sheet metal is deep-drawn (for example, a single steel plate is deep-drawn) to be formed into a container shape, and press work is performed to plastically deform the container-shaped object by applying pressure from the outside. The protrusions 217 of the side portions 210 are formed using this, and then the communication holes 217a are formed by cutting.

  In the above manufacturing process, the thickness of the cover portion 220 may be made larger than the thickness of the side portion 210 at the time of deep drawing when forming a vessel-shaped object. As a result, when the protrusion 217 is formed, the thickness of the side portion 210 is thinner than the thickness of the cover portion 220, so that the protrusion 217 can be easily formed by plastic deformation. Alternatively, after forming a vessel-like object by deep drawing, the thickness of the cover portion 220 is made larger than the thickness of the side portion 210 by using rotational molding, and then the protrusion 217 is formed by pressing. It may be formed. Even in such a case, the projection 217 can be easily formed by plastic deformation.

  By manufacturing the bump stopper cap 200 by the above-described manufacturing method, the side portion 210 and the cover portion 220 are formed so as to be integrated continuously via the curved surface 230. Therefore, for example, the residual stress can be made smaller than the one finished in one part by welding the disk-like part to the container-like part of the configuration of the above comparative example, and the maximum compression of the suspension device 1 The resistance to collision force at times is high.

The bump stopper cap 200 according to the third embodiment is a member having a uniform thickness (for example, the above-mentioned component), and the thickness is the same as the thickness of the cover portion 220. The bump stopper cap 200 according to the first embodiment is lighter than the bump stopper cap 200 according to the first embodiment.
It is also possible to manufacture all the bump stopper caps 200 according to the third embodiment by cutting. Even when the bump stopper cap 200 manufactured by cutting is used, the number of parts can be reduced as compared with the configuration of the comparative example without increasing the weight, and the number of assembling steps can be reduced. In addition, it is possible to suppress erroneous assembly.

DESCRIPTION OF SYMBOLS 1 ... Suspension device, 10 ... Hydraulic shock absorber, 20 ... Piston rod, 30 ... Spring, 41 ... Bump rubber, 42 ... Bump rubber cup, 100 ... Cylinder, 129 ... Oil seal, 200 ... Bump stopper cap, 210 ... Side part 211 ... groove, 215 ... convex part, 217 ... protrusion, 220 ... covering part, 230 ... curved surface

Claims (12)

A cylinder filled with liquid;
A piston housed in the cylinder;
A piston rod that supports the piston and partially protrudes from the cylinder;
A sealing member for sealing the inside of the cylinder so that liquid does not leak from a portion of the cylinder where the piston rod protrudes;
A bump rubber disposed on the outer periphery of a piston rod protruding from the cylinder;
A cover member that covers an outer periphery of the cylinder between the cylinder and the bump rubber;
With
The cover member is
A cylindrical side part, and a cover part provided at one end part in the center line direction of the side part and covering the opening part at the one end part,
The side part and the cover part are molded so as to be continuous integrally, and the thickness of the side part is molded thinner than the thickness of the cover part,
In the side portion, there is a communication path that communicates the space surrounded by the side portion and the cover portion and the cylinder and the space outside the cylinder and not surrounded by the side portion and the cover portion. A suspension device characterized by being formed. The side portion of the cover member protrudes from the inner peripheral surface of the side portion to the outer peripheral side and extends from the other end portion in the center line direction of the side portion toward the one end portion in the center line direction. The suspension device according to claim 1, wherein the communication path is formed by the protruding portion. The side portion of the cover member has a convex portion that protrudes from the inner peripheral surface of the side portion toward the center side and determines a position in the center line direction of the cylinder, and is in the center line direction with respect to the convex portion. The suspension device according to claim 1, wherein the communication path is formed by a through hole formed so as to communicate between the inside and the outside of the cover member in a crossing direction.   The said convex part of the said side part of the said cover member is formed over the perimeter in the circumferential direction, The said through-hole is formed in multiple numbers by the circumferential direction. Suspension device.   The suspension device according to claim 3, wherein a plurality of the convex portions of the side portion of the cover member are formed in a circumferential direction, and the through holes are formed in the respective convex portions.   The suspension device according to any one of claims 1 to 5, wherein the cover member is formed by rotational molding. A cover member that covers the outer periphery of the cylinder between a cylinder filled with liquid and sealed with a sealing member and a bump rubber disposed on the outer periphery of the piston rod protruding from the cylinder,
A cylindrical side,
A cover provided at one end in the direction of the center line of the side portion and covering an opening at the one end;
Have
The side part and the cover part are molded so as to be continuous integrally, and the thickness of the side part is molded thinner than the thickness of the cover part,
In the side portion, there is a communication path that communicates the space surrounded by the side portion and the cover portion and the cylinder and the space outside the cylinder and not surrounded by the side portion and the cover portion. A cover member formed. The side portion has a protruding portion that protrudes from the inner peripheral surface of the side portion toward the outer peripheral side and extends in the center line direction from the other end portion in the center line direction of the side portion to the one end portion side. The cover member according to claim 7, wherein the communication path is formed by the protruding portion. The side portion has a convex portion that protrudes from the inner peripheral surface of the side portion to the center side and determines a position in the center line direction of the cylinder, and in a direction intersecting the central line direction with respect to the convex portion. The cover member according to claim 7, wherein the communication path is formed by a through hole formed so as to communicate between the inside and the outside.   The cover member according to claim 9, wherein the convex portion of the side portion is formed over the entire circumference in the circumferential direction, and a plurality of the through holes are formed in the circumferential direction.   The cover member according to claim 9, wherein a plurality of the convex portions of the side portion are formed in a circumferential direction, and the through hole is formed in each of the convex portions.   The cover member according to any one of claims 7 to 11, wherein the cover member is formed by rotational molding.

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