JPH0525047U - Variable damping force buffer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a damping force variable shock absorber capable of improving the response of damping force change and increasing the number of damping force switching steps by improving the positioning accuracy of the actuator. A damping force variable shock absorber capable of changing a damping force characteristic based on rotation of a control rod 4 provided in a piston rod 1, wherein a drive shaft 23 is connected to the control rod 4. 2 is provided, and the protrusion 11 and the split groove 25a are provided in the opposing portion of the piston rod and the boss portion 25 of the actuator 2 so as to restrict the mutual rotation by fitting each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damping force variable shock absorber configured to change a damping force via a control rod by driving an actuator.

[0002]

[Prior Art]

 Conventionally, as such a damping force variable type shock absorber, for example, the one described in Japanese Patent Publication No. 62-94550 is known.

In this conventional damping force variable shock absorber, the actuator is positioned with respect to the piston rod as the vehicle body side connecting rod by means of a bracket fastened to the piston rod by a nut. .

[0004]

[Problems to be solved by the device]

 However, in such a conventional damping force type shock absorber, the positioning of the actuator is indirectly performed via the bracket, so that the positioning accuracy is deteriorated, and therefore the accuracy is deteriorated. In order to make up for it, it is necessary to increase the switching angle of one step, which deteriorates the response of the damping force change and also has the problem that the number of switching steps is limited.

The present invention has been made by paying attention to the conventional problems as described above, and improves the positioning accuracy of the actuator with respect to the vehicle body side connecting rod to improve the response of the damping force change and the damping force. An object of the present invention is to provide a damping force variable shock absorber capable of increasing the number of switching stages.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the damping force variable type shock absorber of the present invention is capable of changing the damping force characteristic based on the rotation of the control rod provided in the vehicle body side connecting rod. A shock absorber, which has an actuator whose drive shaft is connected to the control rod, and which is fitted to the opposing portion of the vehicle-body-side connecting rod and the base member of the actuator to restrict mutual rotation. The engaging means is provided.

[0007]

[Action]

 In the variable damping force type shock absorber of the present invention, as described above, the engaging means for restricting mutual rotation by being fitted to each other is provided at the facing portion between the vehicle body side connecting rod and the actuator base member. Therefore, the actuator is directly positioned relative to the vehicle body side connecting rod.

As described above, since the positioning accuracy of the actuator with respect to the vehicle body side connecting rod is higher than that in the case of using the bracket, the one-step switching angle can be set smaller by that much, and as a result, the damping force can be reduced. The responsiveness of change is improved, and the number of damping force switching stages can be increased.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment will be described.

FIG. 1 is a cross-sectional view showing a main part of a damping force variable shock absorber according to an embodiment of the present invention, in which 1 is a piston rod and 2 is an actuator.

The piston rod 1 constitutes a vehicle body side connecting rod, and is attached to the vehicle body B via an upper mount insulator 3. That is, the upper mount insulator 3 includes an outer bracket 3b and an inner bracket 3c to which an insulator body 3a made of an elastic body is welded. The inner bracket 3c is fastened and fixed to the vehicle body side mount portion of the piston rod by the nut 31, and the outer bracket 3b is attached to the vehicle body B by the bolts and nuts 32.

The actuator 2 is attached via a bracket 22 fixed to a vehicle body side mount portion of the piston rod 1, and is arranged above the piston rod 1. That is, the bracket 22 is formed in a substantially U shape having outward flange portions 22a and 22b at its upper end, and its lower end center portion is fixed to the vehicle body side mount portion of the piston rod 1 by a nut 21. The actuator 2 is attached to the flange portions 22a and 22b with bolts 27.

The driving of the actuator 2 is controlled by a control signal output from a controller (not shown).

A control rod 4 is rotatably provided in the piston rod 1, and the lower end portion of the control rod 4 is connected to a damping force changing means (not shown) and the upper end portion thereof is It is connected to the drive shaft 23 of the actuator 2.

Next, FIG. 2 is a partially enlarged sectional view showing details of a connecting portion between the actuator 2 and the piston rod 1, FIG. 3 is an XX sectional view of FIG. 2, and FIG. As shown in these drawings, a split groove 23a is formed on the lower end surface of the drive shaft 23 of the actuator 2, while the upper end portion of the control rod 4 is formed with the split groove 23a. An engaging protrusion 4a is formed, and the rotation of the actuator 2 is transmitted to the control rod 4 by the engagement of the protrusion 4a with the split groove 23a.

Further, a boss portion 25 is formed so as to project downward at the center of the actuator base 24, and the actuator 2 is inserted in an insertion hole 26 that vertically penetrates the axial center portion of the boss portion 25. Drive shaft 23 is provided. A split groove 25a is formed on the lower surface of the boss portion 25 serving as the base member, while both side surfaces are formed on the upper end portion of the piston rod 1 by being fitted into the split groove 25a. A ridge 11 for preventing mutual rotation between the two is formed, and a small diameter portion 12 that fits in the insertion hole 26 is formed at the upper end of the ridge 11.

That is, the projecting ridge portion 11 and the split groove 25a constitute an engaging means for restricting mutual rotation of the piston rod 1 and the actuator 2.

Next, the operation of the embodiment will be described.

Since the variable damping force type shock absorber of the present embodiment is configured as described above, when assembling the actuator 2, first, the bracket 22 is fastened to the vehicle body side mount portion of the piston rod 1 by the nut 21. Then, the actuator 2 is attached to the flanges 22a and 22b of the bracket 22 with the bolt 27. When the actuator 2 is attached, the tip small diameter portion 12 of the piston rod 1 is fitted into the insertion hole 26, the protrusion 11 is engaged with the split groove 25a, and the control rod 4 is protruded. The line portion 4a is engaged with the split groove 23a of the drive shaft 23.

Therefore, by fitting the tip small diameter portion 12 of the piston rod 1 into the insertion hole 26, the boss portion 25 is axially aligned with the piston rod 1, and the ridge portion 11 of the piston rod 1 is aligned. By engaging the split groove 25a of the boss portion 25, the actuator 2 is positioned with respect to the piston rod 1 in a state in which its rotation is restricted.

As described above, in the damping force variable type shock absorber of this embodiment, the positioning of the actuator 2 with respect to the piston rod 1 is performed directly without using another member, so that the positioning is performed. The accuracy of is improved, and the switching angle of one step can be set smaller by that amount, which improves the response of the damping force change and increases the number of steps of the damping force change. have.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there are design changes and the like within the scope not departing from the gist of the present invention. Included in the present invention.

For example, although the piston rod is shown as the vehicle body side connecting rod in the embodiment, the cylinder side connecting rod is the vehicle body side connecting rod in the inverted type in which the cylinder side is connected to the vehicle body side.

[0025]

[Effect of the device]

 As described above, in the variable damping force type shock absorber of the present invention, the member for restricting rotation between the vehicle body side connecting rod and the base member of the actuator is fitted to each other by fitting them together. By providing the coupling means, the positioning accuracy of the actuator with respect to the vehicle body side connecting rod is improved, and the switching angle of one step can be set smaller by that much, so that the response of the damping force change is improved. As a result, it is possible to obtain an effect that the number of damping force switching stages can be increased while improving.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a damping force variable shock absorber according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a damping force variable type shock absorber of the embodiment.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a sectional view taken along line YY of FIG.

[Explanation of symbols]

 1 Piston Rod (Vehicle Side Connecting Rod) 2 Actuator 4 Control Rod 11 Projection (Engagement Means) 25 Boss (Base Member) 25a Split Groove (Engagement Means)

Claims (1)

[Scope of utility model registration request] 1. A damping force variable shock absorber capable of changing damping force characteristics based on rotation of a control rod provided in a vehicle body side connecting rod, the actuator having a drive shaft connected to the control rod. The damping force variable shock absorber according to claim 1, further comprising: engaging means for restricting rotation between the vehicle body side connecting rod and the base member of the actuator by engaging with each other.