JP2003287075A - Hydraulic shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable level adjustment for generating damping force and improve the versatility without increasing the number of parts. <P>SOLUTION: In the hydraulic shock absorber, a vehicle body side tube is retractably inserted into an axle side tube, a valve for generating damping force on a lower part of the vehicle body side tube is provided and the valve is opened and closed by the driving of a control rod 5 by manual operation or an actuator A2. A bendable partition 10 is provided between an upper outer periphery of the control rod and an inner periphery of the vehicle body side tube. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shock absorber, and more particularly to a hydraulic shock absorber optimized for use as a rear cushion unit or a front fork mounted on a motorcycle or a motorcycle such as a motorcycle. Regarding the improvement of.

[0002]

2. Description of the Related Art In recent years, a hydraulic shock absorber such as a rear cushion unit or a front fork mounted on a motorcycle or a motorcycle such as a motorcycle has a damping force generated when desired by a rider's manual operation or actuator operation. Is often configured to be adjustable.

For example, as a hydraulic shock absorber of this type, as shown in FIG. 3, the vehicle body side tube 22 is inserted into and retractable from the axle side tube 21 so as to be retractable.
A valve V1 for generating a damping force is provided below the valve, and the valve V1 is connected to the control rod 2 by the actuator A1.
The one that opens and closes by the drive of No. 5 has been developed (Japanese Patent Application No. 200
0-282830). And in this hydraulic shock absorber,
The upper end of the control rod 25 is inserted into the housing H of the actuator A1 (motor), and a seal S such as an O-ring is attached to the outer periphery of the control rod 25 so that the hydraulic oil inside slides on the control rod 25. It is prevented from penetrating into the housing H of the actuator A1.

[0004]

In the above conventional hydraulic shock absorber, the actuator A1 by the rider is used when it is used as a rear cushion unit or a front fork mounted on a motorcycle or a motorcycle such as a motorcycle.
Although it is possible to adjust the level of the generated damping force by driving, etc., improvement of the following problems is desired. That is, since the control rod 25 slides through the seal S, the drive resistance due to the seal S is large and the operation force is large, so that the operation is difficult.

Similarly, the operation with the actuator A1 consumes a large amount of power. Further, the control rod 25 is mounted inside the vehicle body side tube 22 while being integrated with the actuator A1.
It may not be possible to detect whether or not the seal S is attached when 5 is dropped in the middle.

Therefore, the present invention prevents the hydraulic oil from leaking or infiltrating to the outside or the manual operation part or the actuator side, and can reduce the manual operation force of the control rod or the power consumption by the operation by the actuator. It is to provide a hydraulic shock absorber capable.

[0007]

In order to achieve the above-mentioned object, the construction of the hydraulic shock absorber according to the present invention allows the vehicle body side tube to be inserted into and retracted from the axle side tube, and is damped below the vehicle body side tube. In a hydraulic shock absorber that is provided with a valve for force generation and that opens and closes by manually operating or driving the control rod by an actuator, a flexible partition wall between the upper outer periphery of the control rod and the inner periphery of the vehicle body side tube. Is provided.

In this case, the partition wall may be composed of a cylindrical portion and an elastic film body provided in the cylindrical portion, and the cylindrical portion may be positioned by a stopper hung from the actuator.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. In this embodiment, the vehicle is a bicycle (not shown) which is a two-wheeled vehicle, and the hydraulic shock absorber is a front wheel of the two-wheeled vehicle. The case of a front fork mounted on the side is taken as an example.

First, in the front fork according to the present invention, as shown in FIG. 1, the lower end side is an outer tube 1 which is an axle side tube connected to an axle (not shown) of a front wheel, and the upper end side is a vehicle body (not shown). The inner tube 2, which is a vehicle-body-side tube connected to the () side, is inserted through the inner tube 2 so as to be retractable.

At this time, as is well known, approximately in the front fork, the spring force of a suspension spring (not shown) is urged in the extension direction so that the inner tube 2 is projected from the inside of the outer tube 1. There is.

When the front forks are biased in the extension direction, so to speak, only one of the pair of front forks is set to have a suspension spring, and the other is set to ensure the generation of damping force. In some cases, the front fork according to the present invention is a side that ensures the generation of the damping force.

As shown in FIGS. 1 and 2, the present invention is characterized in that an inner tube 2 which is a vehicle body side tube is inserted into and retractable from an outer tube 1 which is an axle side tube, and is damped below the outer tube 2. A valve V2 for force generation is provided, and this valve V2 is opened / closed by a manual operation or a drive of the control rod 5 by an actuator A2. In particular, between the upper outer circumference of the control rod 5 and the inner circumference of the inner tube 2. Flexible partition wall 10
Is provided. The partition wall 10 is composed of a cylindrical portion 11 and an elastic film body 12 provided in the cylindrical portion 11, and the cylindrical portion 11 is provided with a stopper 13 vertically extending from the actuator A2 side.
It is positioned at.

A valve V2 for generating a damping force is provided below the inner tube 2, and this valve V2 divides two oil chambers A and B inside the outer tube 1 and the inner tube 2 into upper and lower oil chambers. Further, as will be described later, the valve V2 is connected to a control rod 5, and the control rod 5 is manually operated or vertically driven by an actuator A2 to open and close the oil chambers A and B, and the valve V2
A damping force corresponding to the opening degree of 2 is generated.

The valve V2 comprises, for example, a valve body, a damping valve provided in the valve body, a bypass that bypasses the damping valve, and an opening / closing hull that opens and closes the bypass.
It is designed to be opened and closed with. Control rod 5
A manual operation unit or an actuator A2 for driving and driving is held on the upper end side of the inner tube 2.

When the control rod 5 is manually operated, the upper end portion of the control rod 5 is inserted into the manual operation part and manually operated.

Similarly, when operating the control rod 5 with the actuator A2, the upper end of the control rod 5 is inserted into the actuator A2 connected to the lead wire AZ. In this case, as shown in FIG. 1, a bellows-shaped bendable partition wall 10 made of rubber, synthetic resin, or the like is provided between the upper outer circumference of the control rod 5 and the inner circumference of the inner tube 2, and inside the oil chamber B. Of the hydraulic oil is prevented from entering the actuator A2 side. At this time, since the control rod 5 is held at the center of the inner tube 2 by the partition wall 10, the work of assembling the actuator A2 is simplified. The partition wall 10 of the control rod 5 is composed of a cylindrical portion 11 and an elastic film body 12 provided in the cylindrical portion 11. Cylindrical part 1
As shown in FIG. 2, 1 is press-fitted into the inner tube 2 and is positioned by a cylindrical stopper 13 vertically provided from the actuator A2. The inner circumference of the film body 1 is held on the outer circumference of the control rod 5. In the present embodiment, the description has been given of the front fork of the bicycle, but the present invention can be applied to the front fork or the rear cushion unit of a motorcycle. It goes without saying that the same applies to the above.

[0018]

As described above, the present invention has the following effects.

1) According to the invention of claim 1, since a flexible partition wall is provided between the control rod and the tube on the vehicle body side, it is possible to prevent hydraulic oil from entering the manual operation part or the actuator side. Moreover, since this partition wall does not give sliding resistance to the control rod, the operating force can be reduced when operating manually, and the power consumption can be reduced when operating with an actuator. 2) Similarly, since the control rod is held at the center of the vehicle body side tube by the partition wall, the work of assembling the manual operation unit and the actuator is simplified.

3) According to the invention of claim 2, since the partition wall is positioned by the stopper, it can be assembled together with the control rod at the time of assembling, and the assembling property is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical front view of one front fork according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of FIG.

FIG. 3 is a partially cutaway vertical front view of a conventional front fork.

[Explanation of symbols]

1 Axle side tube, outer tube 2 Inner tube that is the body side tube 3 Partition disk valve disc 10 partitions 11 cylindrical part 12 Membrane 13 Stopper A2 actuator

Continued front page    (72) Inventor Hideaki Ogura             2-4-1, Hamamatsucho, Minato-ku, Tokyo World Trade             Yasu Center Building Kayaba Industry Co., Ltd. F term (reference) 3J069 AA46 DD48 EE10 EE38

Claims (2)

[Claims] 1. A vehicle body side tube is inserted into and retractable from an axle side tube, a valve for generating a damping force is provided below the vehicle body side tube, and this valve is opened or closed by a manual operation or a control rod driven by an actuator. A hydraulic shock absorber, wherein a flexible partition wall is provided between the upper outer circumference of the control rod and the inner circumference of the vehicle body side tube. 2. The hydraulic shock absorber according to claim 1, wherein the partition wall is composed of a cylindrical portion and an elastic film body provided in the cylindrical portion, and the cylindrical portion is positioned by a stopper hung from the actuator.