JPH10141318A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform both of speed control and kickdown control smoothly by forming a cylinder unit into double piston structurization so as to make it act even either of a hydraulic actuation and a pneumatic actutor. SOLUTION: At the time of speed control, hydraulic pressure is made to act on a head cylinder end side cylinder chamber S1 via a first port 7. Both first and second pistons 3 and 4 are pushed toward the right in a state of being adjoined with each other, and in a state that the hydraulic pressure is filled up in the head cylinder end side cylinder chamber S1, an acting end 10a of a piston rod 10 is driven forward, and an accelerator is trodden via an accelerator jig 13. In time of kickdown control, air pressure is made to act on an intermediate cylinder S3 via a third port 12. The first piston 3 is pushed to the light and the second piston 4 to the right, respectively, and in a state that air pressure is filled up in the intermediate cylinder chamber S3, the action end 10a of the piston rod 10 is driven forward, and the accelerator is trodden via the accelerator low jig 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator having a novel structure, for example, as an actuator for depressing an accelerator for automatic control operation of a test vehicle installed on a chassis dynamometer.
The present invention is suitable for an accelerator depression actuator for automatic control operation, which can smoothly perform vehicle speed (constant speed traveling state) control and kickdown (acceleration by depressing accelerator) control by a cylinder device.

[0002]

2. Description of the Related Art As is well known, when testing the influence of an external radio wave on various electric circuit systems mounted on a vehicle in a vehicle running condition, the vehicle is installed in a radio room and the outside of the radio room is installed. Automatically controls the running condition of the vehicle by automatic control. For such a vehicle test,
Various devices for automatic control must be configured with devices that do not affect radio waves.

[0003]

Conventionally, at the time of the above-mentioned vehicle test, a cylinder device using a pneumatic drive as a driving source has been used as an accelerator depression actuator for automatically controlling the running condition of an automobile. In this cylinder device using air pressure, acceleration control by depressing an accelerator (hereinafter, referred to as kick-down control) can be performed smoothly, but control during constant-speed running of a vehicle that requires fine accelerator pedal movement ( (Hereinafter referred to as vehicle speed control) has a drawback that a smooth operation cannot be performed in terms of air pressure elasticity.

Generally, a hydraulic actuator has a feature that a large operating force is generated and the rigidity of the system is high, so that high-precision positioning can be performed. Have been applied. Pneumatic actuators, on the other hand, have small operating forces and are difficult to position with high precision, but they are easier to handle, more resistant to overload, have lower costs and are explosion-proof compared to hydraulic actuators. Utilizing its features, it is applied to drive systems of various devices.

Therefore, the present invention relates to an actuator having a novel structure, and more particularly, to an actuator which acts very effectively as an accelerator depression actuator for automatic control operation of a test vehicle in a radio wave room. For automatic control operation by a cylinder device with a double piston structure so that it can act as a hydraulic actuator that operates with hydraulic pressure as a drive source and can act as a pneumatic actuator that operates with air pressure as a drive source during kickdown control An object of the present invention is to provide an accelerator depression actuator.

[0006]

In order to achieve the above object, the present invention specifically provides a cylinder having a first port on the head end side and a second port on the rod end side. A first piston and a second piston independently slidably movable in the cylinder along the axial direction of the cylinder, wherein the second piston is connected to the cylinder from the rod end side of the cylinder. Comprising a piston rod extending toward the outside and having a third port on the outer end side, and having a through-hole penetrating the piston rod in the axial direction and communicating with the third port. A head end side cylinder chamber communicating with the first port and a rod end side communicating with the second port in the cylinder by the first and second pistons. Configuring and Linda chamber, an actuator without possible partitioning the intermediate cylinder chamber communicating with the third port through the piston rod through holes.

Further, according to the present invention, there is provided a cylinder having a first port on the head end side and a second port on the rod end side, and independently sliding in the cylinder along the axial direction of the cylinder. 1st combined with movable
And a second piston, wherein the second piston extends from the rod end of the cylinder toward the exterior of the cylinder and includes a piston rod having a third port at the exterior end. And a through-hole penetrating the piston rod in the axial direction and communicating with the third port. The first and second pistons in the cylinder and the first port A head end side cylinder chamber communicating with the rod end side cylinder chamber communicating with the second port, and an intermediate cylinder chamber communicating with the third port through the piston rod through-hole can be partitioned; At the time of vehicle speed control, the head end side cylinder chamber is operated by applying a hydraulic pressure through the first port, and at the time of kick down control, the intermediate pressure is provided through the third port. And it constitutes an actuator to actuate by the action of air pressure in cylinder chamber.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an actuator according to the present invention will be described in detail based on specific embodiments shown in the drawings. FIG. 1 is a diagram for explaining a basic configuration of an actuator according to the present invention along with an operation principle along with an example in which an actuator according to the present invention is applied for accelerator depression for automatic control operation. FIG. 1B is a schematic side cross-sectional view showing a state at the time of vehicle speed control, in which the actuator is operated by hydraulic pressure and an accelerator is depressed by hydraulic pressure, and FIG. FIG. 1C is a schematic side cross-sectional view showing a state in which the accelerator is shifted to a non-operating state, and FIG. 1C shows a mode at the time of kick down control. FIG. 1 is a schematic cross-sectional side view showing a depressed state;
D is a schematic side cross-sectional view showing a state in which air pressure is again applied from the rod end side port to shift the accelerator to an inactive state.

FIG. 2 shows a specific embodiment of the actuator according to the present invention. FIG. 2A is a schematic plan view showing a part of the actuator in cross section. FIG. 2B is a schematic side view showing a state of the appearance. Further, FIG. 3 shows an operation mode of the specific embodiment shown in FIG. 2 corresponding to FIG. 1, and FIGS.
1D is a schematic side sectional view corresponding to each of FIGS.

First, the basic structure and operation of the actuator 1 according to the present invention will be described with reference to FIGS. 1A to 1D. 3A to 3
The operation mode of the accelerator depression actuator according to the specific embodiment shown in FIG. D is the same as that of the basic configuration shown in FIG. 1 and will be described together.

The actuator 1 according to the present invention is basically constituted by an actuator including a cylinder 2, a first piston 3, and a second piston 4. The cylinder 2 has a cylinder head 5 attached to a head end 2a and a rod end sealing member 6 attached to a rod end 2b.
A second port 8 is provided in the rod end side sealing member 6.

On the other hand, the first piston 3 and the second piston 4
Are combined so that they can be independently slid along the axial direction. That is, the first piston 3
Can be adjacent to or away from the second piston 4 in the cylinder 2. The second piston 4 extends from the rod end side of the cylinder 2 through a bearing hole 9 provided in the rod end side sealing member 6 toward the outside of the cylinder.
It is composed of those containing 0.

The second piston 4 is provided with a through hole 11 penetrating the piston portion and the piston rod portion in the axial direction and reaching the working end 10a of the piston rod 10.
A third port 12 is attached to the working end 10a side of the piston rod 10, and the second piston 4
Is formed to communicate with a through hole 11 penetrating through in the axial direction.

On the working end 10a side of the piston rod 10 in the second piston 4, an accelerator jig 13 is provided.
Is attached, and is mechanically connected to the accelerator in the test vehicle, and provides a state in which the accelerator is depressed when the piston rod 10 of the second piston 4 is moved forward. 1
It provides an inactive state of the accelerator at the time of zero retraction operation.

The inside of the cylinder 2 is formed by the first piston 3 and the second piston 4 by the first port 7.
, A rod-side cylinder chamber S2 communicating with the second port 8, and a third port 12 through the piston rod through-hole 11.
And an intermediate cylinder chamber S3 communicating therewith.

The actuator 1 according to the present invention includes a hydraulic pressure source 14 for applying a hydraulic pressure to the first port 7 provided on the head end side of the cylinder 2 via the first port 7 in the cylinder. Is made of things. In the embodiment shown in the figure, the hydraulic supply source 14 has an oil tank, and is pressurized by an air pressure supply means 15.

On the other hand, a second port 8 provided on the rod end side of the cylinder 2 is connected to an air pressure supply source for applying air pressure to the inside of the cylinder. An air pressure supply source for applying air pressure in the cylinder is connected to a third port 12 provided on the working end 10a side of the piston rod 10 in FIG.

The actuator 1 of the present invention having the above configuration operates as follows. First, at the time of vehicle speed control,
As shown in FIG. 1A, the cylinder is operated by applying a hydraulic pressure to the head end side cylinder chamber S1 through the first port 7. In this case, as shown in FIG. 1A, the first piston 3 and the second piston 4 are pushed rightward in the drawing in an adjacent state, and the hydraulic pressure is filled in the head end side cylinder chamber S1. In the state, the working end 10a of the piston rod 10
Is operated forward, and the accelerator is depressed through the accelerator low jig 13 to provide a vehicle speed control state.

When it is desired to release the accelerator depression state from this state, as shown in FIG. 1B and FIG. 1D, air pressure is applied to the rod end side cylinder chamber S2 through the second port 8. Activate. in this case,
The second piston 4 and the first piston 3 are shown in FIG.
As shown in FIG. 3B, when the rod end side cylinder chamber S2 is filled with the air pressure, the working end 10a of the piston rod 10 is retracted, and the accelerator rod jig 13 is pressed. Release the accelerator pedal via.

Next, the kick down control by the actuator 1 of the present invention will be described. During the kick down control, the intermediate cylinder chamber S3 is operated by applying air pressure to the intermediate cylinder chamber S3 through the third port 12. In this case, the air pressure applied to the third port 12 is
A load is applied between the second piston 4 and the first piston 3 through the through-hole 11, and as shown in FIG. 1C, the first piston 3 is pushed leftward in the figure to The piston 4 is pushed rightward in the figure to actuate the working end 10a of the piston rod 10 forward while the intermediate cylinder chamber S3 is filled with air pressure, and the accelerator is depressed via the accelerator row jig 13. Provides a kickdown control state.

[0021]

The actuator of the present invention having the above-mentioned structure is constituted by a simplified device having a small number of parts, is easy to manufacture, is suitable for mass production, and is economical. It can be said that this works extremely advantageously.

Further, the actuator according to the present invention can be designed with components that are not easily affected by radio waves during the automatic control operation of the test vehicle in the radio wave room. At times, the hydraulic pressure can act as a hydraulic actuator that operates as a drive source, and during kickdown control, it can act as a pneumatic actuator that operates with air pressure as a drive source, making both vehicle speed control and kickdown control extremely smooth. It can be said that this works extremely effectively in that it can be performed in a timely manner.

[Brief description of the drawings]

FIG. 1 is a view for explaining a basic configuration of an actuator according to the present invention together with its operation principle, and FIG. 1A is a view showing a mode at the time of vehicle speed control; FIG. 1B is a schematic side sectional view showing a state in which the accelerator depression actuator is operated by hydraulic pressure and the accelerator is depressed by hydraulic pressure, and FIG. FIG. 1C is a schematic side cross-sectional view illustrating a state in which the accelerator pedal is depressed by air pressure when the accelerator depression actuator is operated by air pressure. FIG. 1D is a schematic side view showing a state in which air pressure is again applied from the rod end side port to shift the accelerator to an inactive state. It is a surface view.

FIG. 2 shows a specific embodiment of the actuator according to the present invention.
FIG. 2A is a schematic plan view showing a part of the cross section, and FIG. 2B is a schematic side view showing the appearance thereof.

FIG. 3 shows the operation of the embodiment shown in FIG. 2 corresponding to FIG. 1, and FIGS. 3A to 3D show FIGS. FIG. 2 is a schematic side sectional view corresponding to each of the views of FIG. 1D.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Actuator 2 Cylinder 2a Head end side of cylinder 2b Rod end side of cylinder 3 First piston 4 Second piston 5 Cylinder head 6 Rod end side sealing member 7 First port 8 Second port 10 Piston rod 10a Working end of piston rod 11 Through hole 12 Third port 13 Accelerator jig S1 Head end cylinder chamber S2 Rod end cylinder chamber S3 Intermediate cylinder chamber 14 Hydraulic supply source 15 Air pressure supply means

Claims (2)

[Claims] 1. A cylinder having a first port on a head end side and a second port on a rod end side, and independently slidable and movable within the cylinder along an axial direction of the cylinder. A piston rod extending from the rod end of the cylinder to the outside of the cylinder and having a third port at the outside end. And a through-hole penetrating the piston rod in the axial direction and communicating with the third port. The first and second pistons in the cylinder, A head-end cylinder chamber communicating with one port, a rod-end cylinder chamber communicating with the second port, and a communication with the third port through the piston rod through-hole. An actuator, wherein an intermediate cylinder chamber can be partitioned. 2. A cylinder having a first port on the head end side and a second port on the rod end side, and independently slidable and movable within the cylinder along the axial direction of the cylinder. A piston rod extending from the rod end of the cylinder to the outside of the cylinder and having a third port at the outside end. And a through-hole penetrating the piston rod in the axial direction and communicating with the third port. The first and second pistons in the cylinder, A head-end cylinder chamber communicating with one port, a rod-end cylinder chamber communicating with the second port, and a communication with the third port through the piston rod through-hole. An intermediate cylinder chamber can be separated from the intermediate cylinder chamber. During vehicle speed control, the head end side cylinder chamber is operated by applying hydraulic pressure via the first port. During kick down control, the head end side cylinder chamber is operated via the third port. An actuator characterized in that the actuator is operated by applying air pressure to the intermediate cylinder chamber.