JPH0245546Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a hydraulic shock absorber, particularly to a mounting structure for a variable damping force type hydraulic shock absorber.

(Prior Art) In general, there are two types of hydraulic shock absorbers (hereinafter simply referred to as shock absorbers) that have an eye-type mounting part for both the upper and lower parts, and a stud-type upper part and an eye-type mounting part for the lower part. There is. The type of upper mounting part of a shock absorber used in a vehicle's rear suspension and non-strut type front suspension is determined by the vehicle structure and suspension type, and the shock absorber is susceptible to both twisting and prying. The stud format is usually used when
The eye format is used when only torsion is involved.

(Problem to be solved by the invention) However, in the case of a known automatic switching type variable damping force shock absorber that changes the damping force by switching the orifice through which oil passes, a motor for switching the orifice is required. Since the switching drive unit, such as a power supply or a planetary gear mechanism, is built into the piston rod, a harness connector must be attached to the piston rod to supply power to the switching drive unit from the outside and transmit control signals, etc. However,
If you try to attach the connector to the side of the piston rod, it is difficult to attach the connector terminal on the piston rod side and it is difficult to put it into practical use. Therefore, the connector must be attached to the tip of the piston rod that protrudes from the dust boot at the top of the shock absorber body. Therefore, it was only possible to make the damping force variable when the upper mounting part was a stud type. As a result, when it is desired to use a shock absorber with variable damping force, the vehicle structure and suspension type are restricted, making it impossible to design the vehicle freely.

(Means and effects for solving the problem) This invention was made by paying attention to such conventional problems. A hollow fitting with a partially open side that surrounds the external wiring connector attached to the tip is attached so that it cannot rotate relative to the piston rod, and an upper eye is attached to the upper end of this fitting so that it is concentric with the piston rod. By installing it, the upper mounting part of the variable damping force hydraulic shock absorber is not limited to a stud type, but can also be made into an eye type, allowing for free vehicle design without being restricted by vehicle structure or suspension type. It is designed so that it can be done.

(Example) This invention will be explained below based on the drawings.

1 to 4 are diagrams showing an embodiment of this invention. In FIG. 1, reference numeral 1 denotes a variable damping force type hydraulic shock absorber in which a piston rod 2 has a built-in switching drive section for switching an orifice in order to change the damping force. The male threaded tip 2a of the piston rod 2 protruding from the dust boot 3 at the upper end of the outer cylinder of the shock absorber 1 is provided with a planar cutout 4 as shown in FIGS. 3a and 3b. 5 is a nut screwed onto the male thread of the piston rod tip 2a to fix the piston rod 2 to the dust boot 3, and 6 is an orifice switching drive such as a motor (not shown) or a planetary gear mechanism installed inside the piston rod 2. This connector is attached to the tip of the piston rod 2 to connect the harness 7 that transmits power and control signals from the outside to the internal wiring to the piston rod. 8 is a hollow fixture that is rectangular as a whole and has two open sides. As shown in FIG. 4, the lower end surface of the fixture 8 has a shape that is the same as the cross section of the tip 2a of the piston rod 2 having the notch 4, and the tip 2a is tightly fitted to prevent relative rotation. Possible holes 9 are drilled. The fitting 8 is attached to the tip 2a of the piston rod 2 so that it cannot rotate relatively by fitting the tip 2a of the piston rod 2 into the hole 9, and is clamped by the nut 5 and the dust boot 3. It is fixed to the dust boot 3 in this state. As a result, the fitting 8 is attached to the tip 2a of the piston rod 2, the nut 5 attached to the tip 2a, and the connector 6.
It is now surrounded by. An eye 10 of the upper mounting portion is welded to the upper end surface of the fixture 8 in a positional relationship such that its longitudinal center axis is concentric with the center axis of the piston rod 2. In contrast to the structure of the upper mounting part having the above configuration, the structure of the lower mounting part is similar to that of the conventional eye type, and therefore a description thereof will be omitted.

In the case of the upper mounting portion of the variable damping force type hydraulic shock absorber 1 having the above-described configuration, when the connector 6 is positioned at the tip end 2a of the piston rod 2, the harness 7 is attached to the open side surface portion of the fitting 8. Since the fitting 8 cannot rotate relative to the piston rod 2, the upper eye 10 is fixed directly to the tip 2a of the piston rod 2. It can function in the same way as an eye.

(Effects of the invention) As explained above, according to this invention, it is possible to provide a variable damping force hydraulic shock absorber in which both the upper and lower mounting parts are eye-type and the damping force changing operation is automated. can. As a result, there are no restrictions on vehicle structure or suspension type when using a variable damping force type hydraulic shock absorber, and it becomes possible to freely design the vehicle.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the structure of the upper mounting part of the variable damping force type hydraulic shock absorber according to this invention, and FIG. 1 is a partially cutaway front view thereof, and FIG. FIG. 3a is a front view of the tip of the piston rod, FIG. 3b is a front view of the tip of the piston rod, and FIG. 4 is a bottom view of the fitting showing the shape of the hole provided in the fitting. be. 1... variable damping force hydraulic shock absorber, 2... piston rod, 2a... tip of piston rod, 6
... Connector, 7 ... Harness, 8 ... Mounting tool,
10... Upper eye.

Claims (1)

[Scope of utility model registration request] A switching drive unit that switches the orifice to change the damping force is built into the piston rod, and an external wiring connector is attached to the tip of the piston rod that protrudes from the top of the shock absorber body to send power and control signals from the outside to the switching drive unit. In a hydraulic shock absorber with variable damping force, a hollow fitting with a partially open side surface, which surrounds the tip of the piston rod and the connector and which rotates relative to the piston rod, is attached to the tip of the piston rod that protrudes from the upper end of the shock absorber body. A mounting structure for a variable damping force hydraulic shock absorber, characterized in that the upper eye is mounted concentrically with the piston rod at the upper end of the mounting tool.