JPH053784Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front fork that can change the generated damping force depending on driving conditions, etc.

(Prior Art) The present applicant has already proposed many devices that can optimally adjust the damping force generated by a front fork for a two-wheeled vehicle depending on driving conditions and the like.

The proposal proposed in Japanese Patent Application No. 61-305817 is to install a solenoid valve inside the cylinder and change the excitation current value of the solenoid valve in response to a signal from the control circuit, thereby changing the resistance to the flow of hydraulic oil and reducing the generated attenuation. It changes the force in a responsive manner according to operating conditions, etc.

This type has a solenoid valve that generates damping force above the cylinder inside the front fork, so the solenoid valve housing does not protrude from the side of the front fork, and the solenoid valve prevents stones from flying while driving. This has the effect of preventing damage caused by

(Problem that the invention aims to solve) However, in this case, the lead wire that connects the solenoid valve located inside the front fork to the external control circuit passes through the oil from the bottom of the outer tube and connects to the solenoid valve. The lead wires may bend repeatedly due to the vibration of the front forks and the flow of hydraulic oil as they expand and contract, and may eventually break due to fatigue. In particular, when connecting the other end of the lead wire connected to the internal solenoid to the wiring terminal, part of the lead wire is pulled out from the cylinder, connected to the terminal, and then returned to the inside of the cylinder, so be sure to This slack causes bending of the lead wire,
Increases fatigue caused by vibration.

Further, when the lead wire is passed into the cylinder during assembly, the lead wire tends to get caught in the middle, resulting in problems such as poor work efficiency during assembly.

The present invention aims to solve such problems.

(Means for solving the problem) The present invention houses an inner tube in an outer tube, and also stands up a cylinder from the bottom of the outer tube that slides into contact with the inner periphery of the inner tube, and has a compression side damper in the upper part of the cylinder. A damping force adjustable front fork is provided with a solenoid that controls the valve opening pressure according to the excitation current, and the excitation current is supplied from an external control circuit to this solenoid, and one end is connected to the solenoid coil. A coil-shaped wiring member, the other end of which connects to a wiring terminal provided at the bottom of the cylinder, is spirally arranged along the inner wall of the cylinder.

(Function) The coil-type wiring member is arranged in a spiral along the inner wall of the cylinder, so it does not sag inside the cylinder, and since it runs along the inner wall surface, it is less affected by the flow of hydraulic oil. Therefore, it can exhibit high durability against front fork vibrations and hydraulic fluid force. In addition, when the coil-shaped wiring member is returned to the cylinder after wiring, it will return to its original shape due to the spring action, making it extremely easy to connect the wiring member to the terminal without locally deforming the wiring member. can be carried out efficiently.

(Example) As shown in the figure, an inner tube 2 having a piston portion 3 at the tip is provided inside the outer tube 1.
A cylinder 4 is vertically disposed at the bottom of the outer tube 1 and has a piston portion 5 that slides on the inner periphery of the inner tube 2 .

Between the tip of the inner tube 2 and the outer tube 1, there is a lower oil chamber 7 that contracts during pressure side operation, and a piston portion 3 of the inner tube 2.
An upper oil chamber 8 is formed between the piston portion 5 of the cylinder 4 and the piston portion 5 of the cylinder 4. Further, an oil reservoir chamber 9 is formed above the cylinder 4 and inside the inner tube 2, and this oil reservoir chamber 9 communicates with the lower oil chamber 7 through an internal space 10 of the cylinder 4.

A solenoid 11 is attached to the upper part of the cylinder 4, and a compression side damping valve 12 housed in a valve case 13 is disposed coaxially with the solenoid 11. A suspension spring 14 is arranged at the upper end of the valve case 13.

In the solenoid 11, a movable core 17 is slidably disposed inside a coil 16, a valve shaft 18 of a damping valve 12 is attached to the movable core 17, and when the coil 16 is energized, The valve stem 18 is pulled, and the valve plate 19 attached to the valve stem 18 is seated on the seat portion 20 that is locked inside the valve case 13. When the coil 16 is not energized and excited, the movable core 17 and the valve shaft 18 are pushed back by the return spring 21, and the valve plate 19 is separated from the seat portion 20.

The outer circumference of the valve case 13 is the inner tube 2
Therefore, during pressure side operation, the hydraulic oil flowing from the lower oil chamber 7 to the oil reservoir chamber 9 passes through the outer periphery of the solenoid 11 from the window 22 formed at the upper part of the cylinder 4. After passing through the lower groove 23 of the valve case 13 and the seat portion 20, it flows into the oil reservoir chamber 9 from the upper hole 24 of the valve case 13.

Therefore, during pressure side operation when the inner tube 2 enters, part of the hydraulic oil in the lower oil chamber 7 flows into the upper oil chamber 8, and the rest flows into the oil reservoir chamber via the internal space 10 of the cylinder 4. Head to 9.

The flow to the oil sump chamber 9 is controlled by the damping valve 1 as described above.
2, the generated damping force is low when the damping valve 12 is open, but when it is closed, there is a large resistance and the generated damping force becomes high.

In order to control the opening and closing of the damping valve 12 in this way,
Excitation current for the solenoid 11 is controlled by an external control circuit 25 .

Normally, driving conditions are detected and the control circuit 25 energizes the solenoid 11 so that the damping force is increased, for example, during braking, an increase in payload, high-speed cornering, and the like.

In order to electrically connect the control circuit 25 and the coil 16 of the solenoid 11, a coil-shaped wiring member 30 is disposed in the internal space 10 of the cylinder 4 in the present invention.

As shown in FIG. 2, the coil-type power distribution member 30 has a lead wire formed into a spiral spring shape with a diameter slightly larger than the inner diameter of the cylinder 4.
By forming the conductive core material 32 covered with the insulating covering material 31 from a member having a relatively high elastic restoring force, the restoring force to the initial shape after deformation is ensured.

One end of the wiring member 30 is connected to a lead wire connected to the solenoid coil 16.

The other end of the wiring member 30 is fitted and held on the inner periphery of the cylinder 4 by a guide 39, and is connected to a wiring terminal 33 disposed through a bottom hole 35 of the outer tube 1 via a coil spring 34. contact.

The wiring terminal 33 is connected to the bottom hole 3 of the outer tube 1.
5 and is screwed onto the inner periphery of the cylinder 4, and is oil-tightly housed in a guide tube 36 which also serves as a cylinder tightening bolt, and a lead wire 37 from the control circuit 25 is connected to the lower part of the passage. . In addition, this lead wire 3
7 is arranged on the lower surface of a brake mounting bracket 38 etc. provided at the lower part of the outer tube 1, so that the lead wire 37 is protected from damage.

In this way, the wiring member 30 is elastically wound around the inner wall of the cylinder 4 in a spiral manner, and does not sag in the inner space 10, thereby preventing vibration of the front fork and flow of hydraulic oil passing through the inner space 10. Even when subjected to physical strength, the wiring member 30 will not be damaged, and the control current from the control circuit 25 can be reliably energized to the coil 16 of the solenoid 11.

In addition, the wiring member 30 is assembled to the guide tube 3.
6, the other end of the wiring member 30 connected to the solenoid coil 16 is fixed via a guide 39 that fits on the inner periphery near the bottom of the cylinder 4, and then the guide 39 with the wiring terminal 33 inside is fixed. The tube 36 is passed through the bottom hole 35 and screwed onto the inner periphery of the cylinder 4 to bring the coil spring 34 into contact with it, making it possible to connect the solenoid 11 very easily.

(Effects of the invention) As described above, according to the invention, the coil-type wiring member is arranged in a spiral along the inner wall of the cylinder, so it does not sag inside the cylinder, and moreover, it does not sag along the inner wall surface. Because of this, it is less susceptible to the influence of the flow of hydraulic oil, and therefore exhibits high durability against front fork vibrations and the fluid force of hydraulic oil. In addition, when the coil-shaped wiring member is returned to the cylinder after wiring, it will return to its original shape due to the spring action, making it extremely easy to connect the wiring member to the terminal without locally deforming the wiring member. can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of a wiring member. 1: outer tube, 2: inner tube, 4: cylinder, 10: internal space, 11:
...... solenoid, 12... damping valve, 13... valve case, 16... coil, 25... control circuit,
30: Wiring member; 31: Covering material; 32: Core material; 33: Wiring terminal; 34: Coil spring; 35: Bottom hole; 36: Guide tube; 37:
…lead wire, 39…guide.

Claims (1)

[Scope of utility model registration request] The inner tube is housed in the outer tube, and a cylinder that slides on the inner circumference of the inner tube is installed from the bottom of the outer tube, and a solenoid is installed on the top of the cylinder to control the opening pressure of the compression side damping valve according to the excitation current. In a damping force adjustable front fork that supplies excitation current from an external control circuit to this solenoid, one end is connected to the solenoid coil and the other end is connected to a wiring terminal located at the bottom of the cylinder. A damping force adjustable front fork characterized by a coil-shaped wiring member arranged spirally along the inner wall of the cylinder.