JP2005273863A - Hydraulic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic damper, in which a tank can be freely rotated around an axial center of a damper main body to the damper main body, or around the axial center of the damper main body and in the vertical direction as desired to be applicable to various kinds of vehicles. <P>SOLUTION: This hydraulic damper comprises the damper main body B1, and the tank CL coupled outside the damper main body B1, with a hydraulic chamber 22 in the damper main body B1 connected to an oil chamber 3 in the tank CL. The tank CL is coupled to the damper main body B1 through a cylindrical body 8 engaged with the outer circumference of the damper main body CL to be rotatable around the damper main body, and a circular oil passage 5A is formed along the inner circumference of the cylindrical body B1 to connect the hydraulic chamber 22 in the damper main body B1 to the oil chamber 3 in the tank CL. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is suitable for use in a rear cushion unit for suspending a rear wheel of a motorcycle, a suspension device for a snowmobile, and the like, and particularly relates to a hydraulic shock absorber having an external tank.

  In general, a hydraulic shock absorber, which is a rear cushion unit, is interposed between the vehicle body and the rear wheel of a motorcycle such as a motorcycle, and the rear wheel is suspended to attenuate the vibration input from the road surface. Has improved.

  As this type of hydraulic shock absorber, an external tank type in which a tank is integrally coupled to the outside of the shock absorber body via a joint portion is generally known.

  However, since this type of hydraulic shock absorber has a fixed tank mounting position, there is a problem that the tank position cannot be arbitrarily changed according to the specifications. Therefore, the hydraulic shock absorber can change the tank position each time. For example, the one disclosed in Patent Document 1 has been developed.

  This hydraulic shock absorber is composed of a shock absorber body and a tank that is coupled to the shock absorber body through a joint portion so as to be rotatable in the vertical direction. The joint portion includes a liquid chamber in the shock absorber body and an oil in the tank. An oil passage connecting the chamber is provided, and a damping valve is provided in the middle of the oil passage so as to be freely opened and closed.

This hydraulic shock absorber has a tank mounting position in the vertical direction according to the relationship of the installation space depending on the vehicle type on which it is mounted, the relationship of avoiding interference with other members of the vehicle, the design of the vehicle, the driver's driving preference, etc. In this hydraulic shock absorber, the joint portion can be rotated so that it can be set to various angles each time, and the tank is rotated in the vertical direction and fixed at an arbitrary position.
JP 2003-254373 A (Claim 1, FIG. 1)

  The conventional hydraulic shock absorber is not particularly defective in terms of function, but it is desired to improve the following problems.

  That is, since the conventional hydraulic shock absorber shown in Patent Document 1 has a structure in which the tank can rotate only in the vertical direction, there is no degree of freedom to displace the tank around the axis of the shock absorber body.

  However, in recent years, there has been a demand to be able to shift the tank in the direction around the axis of the shock absorber body or in the vertical direction from the viewpoint of avoiding interference with other members, such as mounting space on the vehicle. The improvement is desired.

  Therefore, an object of the present invention is to freely rotate the tank in the direction around the axis of the shock absorber main body, or around the axis of the shock absorber main body and in the vertical direction. It is to provide a hydraulic shock absorber that can be mounted according to the vehicle type.

  In order to achieve the above object, one means of the present invention comprises a shock absorber body and a tank coupled to the outside of the shock absorber body, and the liquid chamber in the shock absorber body communicates with the oil chamber in the tank. In the hydraulic shock absorber, the tank is coupled to the shock absorber body via a cylindrical body that is rotatably fitted around the axis of the shock absorber body on the outer periphery of the shock absorber body, and is buffered on the inner periphery of the cylinder body. An annular oil passage communicating with the liquid chamber in the vessel body and the oil chamber on the tank side is formed.

  Similarly, the other means includes a shock absorber main body and a tank coupled to the shock absorber main body via a joint portion, and an oil chamber in the tank via an oil passage formed in the shock absorber main body in the joint portion. In the hydraulic shock absorber communicated with the cylindrical body, the joint portion is fitted to the outer periphery of the shock absorber main body so as to be rotatable around the axis of the shock absorber main body, and the cylinder body is integrally extended laterally from the cylindrical body. A cylindrical portion and a cylindrical socket that protrudes from the tank and is coupled to the cylindrical portion so as to be freely rotatable in the vertical direction. The liquid chamber in the shock absorber body and the oil in the tank are connected to the cylindrical body, the cylindrical portion, and the cylindrical socket. An oil passage communicating with the chamber is formed.

  According to the invention of each claim, the cylindrical body coupled to the tank is rotatably fitted to the shock absorber body around the axis of the shock absorber body. Can rotate around the core.

  In other words, even after the hydraulic shock absorber itself is mounted on the vehicle, the tank position is buffered each time according to the relationship of the installation space according to the vehicle type, the relationship to avoid interference with other members, the relationship of the vehicle design, etc. It can be set at an arbitrary position around the axis of the device body, and the degree of freedom in assembling is increased, so that the workability and economy of assembling can be improved.

  Hereinafter, the embodiment of the present invention will be described with reference to the drawings. The basics of the hydraulic shock absorber A of the present invention are as shown in FIGS. 1 and 3, outside the shock absorber main body B1 and the shock absorber main body B1. The liquid chamber 22 in the shock absorber main body B1 communicates with the oil chamber 3 in the tank CL. In particular, the tank CL is arranged on the outer periphery of the shock absorber main body B1. The cylinder body 8 is coupled to the shock absorber body B1 through a cylindrical body 8 that is a joint portion rotatably fitted around the axis of the shock absorber body, and the liquid chamber 22 in the shock absorber body B1 is connected to the inner periphery of the cylinder body 8. An annular oil passage 5A communicating with the tank side oil chamber 3 is formed.

  If necessary, the tank CL can be rotated in the vertical direction as shown in FIG.

  More specifically, the hydraulic shock absorber according to the present invention includes a shock absorber main body B1, a tank CL coupled to the shock absorber main body B1 via the joint portion 4, and a suspension spring S arranged in parallel with the shock absorber main body B1. I have.

  As is well known, the shock absorber main body B1 includes a rod side oil chamber and an anti-rod side oil chamber 22 which are partitioned in a cylinder 21 via a piston 23, and the tank CL is provided in the tank case 1 and the tank case 1. A partitioned gas chamber 2 and oil chamber 3 are provided.

  An oil chamber in the tank CL is provided via an oil passage 5A, 5B, 6 formed in the joint portion 4 by the liquid chamber 22 in the shock absorber body B1 and a damping valve 7 provided in the middle of the oil passage 5B, 6. 3, the damping valve 7 may be provided in the shock absorber body B1.

  The joint portion 4 includes a cylindrical body 8 that is fitted to the outer periphery of the shock absorber main body B1 so as to be rotatable around the axis of the shock absorber main body, and a cylindrical portion 11 that protrudes sideways from the cylindrical body 8; It is composed of a cylindrical socket 9 protruding from the tank CL and coupled to the cylindrical portion 8A so as to be freely rotatable in the vertical direction.

  The upper and lower ends of the cylindrical body 8 are sandwiched between the outer peripheral step portion 27 on the cylinder 21 side and the outer peripheral step portion 29 on the cap 28 side, thereby setting positions in the direction around the axis of the shock absorber body B1.

  Oil passages 5A and 5B communicating with the liquid chamber 22 in the shock absorber body B1 are formed in the cylindrical body 8 and the cylindrical portion 11, and an oil passage communicating with the oil chamber 3 in the tank CL is formed in the cylindrical socket 9. 6 is provided, and a damping valve 7 is provided in an openable and closable manner in the middle of the oil passage 5B in the cylindrical portion 11 and the oil passage 6 in the cylindrical socket 9.

  In this case, as shown in FIG. 3, the cylindrical body 8 is fitted to the outer periphery of the cylinder 21 so as to be rotatable around the axis of the cylinder, and an oil passage 5 </ b> A including an annular groove formed on the inner periphery of the cylindrical body 8 is provided. It communicates with the anti-rod side liquid chamber 22 through a port 24 formed in the cylinder 21 and is integrally connected to an oil passage 5B formed in the cylindrical portion 11.

  Further, a hollow bolt 10 having a diameter smaller than that of the cylindrical portion 11 is screwed to the end portion of the cylindrical portion 11, and a cylindrical socket 9 is fitted to the outer periphery of the hollow bolt 10 so as to be freely rotatable in the vertical direction. The pin-shaped socket 9 is clamped and fixed.

  Specifically, the cylindrical portion 11 is integrally formed at the end of the cylindrical body 8, the hollow bolt 10 is configured as a valve body having a flange 13 at the outer end, and the cylindrical socket 9 is connected to the outer end of the cylindrical portion 11. The spacer 13 is in contact with the flange 13 and the flange 13.

  The shock absorber body B1 is coupled to the vehicle body side via the mounting bracket 25, and is coupled to the wheel side via the mounting bracket 26, and the tank CL is disposed externally to the shock absorber body B1. Yes.

  As shown in FIG. 3, the cylindrical portion 11 is provided so as to protrude to the side of the shock absorber body B1, and the tank CL rotates around the axis of the cylindrical portion 11 as will be described later. As shown by the dotted line in FIG. 1, the mounting position can be arbitrarily adjusted around the axis of the cylindrical portion 11 so as not to interfere with other members.

  Similarly, the cylindrical body 8 is fitted to the outer periphery of the cylinder 21 so as to be rotatable around the axis of the cylinder 21, so that the entire joint portion 4 is rotated around the axis of the shock absorber body B1 as shown in FIG. It can be rotated in the direction of the arrow Y, so that the tank CL can also rotate in the same direction following the joint portion 4, so that it does not interfere with other members, and can correspond to the installation space according to the vehicle type. Yes.

  The hollow bolt 10 is provided with vertical and horizontal oil passages 15 and 16 and a valve 7 provided in the oil passage 15, and the hollow bolt 10 is screwed into the oil passage 15 from the outside of the cylindrical socket 9. ing.

  The valve 7 includes a pressure-side damping valve 17 made up of a leaf valve, a spring 19 that urges the valve 7 in the closing direction, and a check valve made up of a leaf valve that wraps the pressure-side damping valve 17 in a known manner. Yes.

  The hollow bolt 10 also serves as a valve body. An adjuster 20 is rotatably screwed into the end of the hollow bolt 10, and a spring 19 is interposed between the adjuster 20 and the compression side damping valve 17. The initial spring load of the spring 19 is adjusted according to the stroke of the adjuster 20, and the damping force of the compression side valve 17 is arbitrarily adjusted.

  According to the above-described hydraulic shock absorber A, the piston rod 23 enters the cylinder 21 during the compression operation, and at this time, the oil corresponding to the piston rod intruding volume from the non-rod side oil chamber 22 is compressed on the pressure side damping valve from the oil passages 5A and 5B. 17 is opened, and further flows out into the oil chamber 3 on the tank CL side through the oil passages 15 and 16 and the oil passage 6, and the compression side damping valve 17 generates the compression side damping force.

  During the extension operation, the piston rod is retracted from the cylinder 21, and the piston rod enters from the tank CL through the oil passage 6-oil passage 16, 15-check valve-oil passage 5B-oil passage 5A to the opposite rod-side oil chamber 22. The exit volume of oil is introduced.

  In the above embodiment, the cylindrical body 8 and the tank CL are coupled to each other via the joint portion 4, but the present invention also applies to a tank structure in which the cylindrical body 8 and the tank CL are integrally formed by molding or the like. Is applicable. That is, although not shown, the joint portion may be only the cylindrical body 8, and the tank CL may be rotated around the axis of the shock absorber body B1 by directly connecting the tank CL to the cylindrical body 8.

1 is a partially cutaway front view of a hydraulic shock absorber according to an embodiment of the present invention. FIG. 2 is a partially enlarged front view of FIG. 1. It is the crossing enlarged plan view in the joint part of FIG.

Explanation of symbols

B1 Shock absorber body CL tank 4 Joint portion 5A, 5B, 6 Oil passage 8 Cylindrical body 8A Cylindrical portion 9 Cylindrical socket 21 Cylinder 22 Liquid chamber 23 Piston rod 24 Port

Claims (3)

The hydraulic shock absorber is composed of a shock absorber body and a tank coupled to the outside of the shock absorber body, and the liquid chamber in the shock absorber body communicates with the oil chamber in the tank. Annulus connected to the shock absorber body through a cylindrical body that is rotatably fitted around the axis of the shock absorber body, and communicates with the liquid chamber in the shock absorber body and the oil chamber on the tank side on the inner periphery of the cylinder body. Hydraulic shock absorber characterized by forming an oil passage The shock absorber body is composed of a cylinder, a piston rod movably inserted into the cylinder via a piston, and a rod-side liquid chamber and an anti-rod-side liquid chamber partitioned by the piston in the cylinder. The outer periphery of the cylinder is rotatably fitted around the axis of the cylinder, and an oil passage composed of an annular groove formed on the inner periphery of the cylinder is communicated with the anti-rod side liquid chamber via a port formed in the cylinder. The hydraulic shock absorber according to claim 1 Hydraulic pressure that consists of a shock absorber body and a tank coupled to the shock absorber body via a joint portion, and a fluid chamber in the shock absorber body communicates with an oil chamber in the tank via an oil passage formed in the joint portion. In the shock absorber, a cylindrical body in which the joint portion is rotatably fitted to the outer periphery of the shock absorber main body around the axis of the shock absorber main body, a cylindrical portion integrally projecting laterally from the cylindrical body, and a tank. A cylindrical socket that extends and is rotatably coupled around the axis of the cylindrical portion, and communicates with the liquid chamber in the shock absorber body and the oil chamber of the tank through the cylindrical body, the cylindrical portion, and the cylindrical socket. Hydraulic shock absorber characterized by forming an oil passage

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