JP2000141111A - Chuck device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the extending diameter of a tip of a chuck by providing a core member for pushing the tip of the chuck of a chuck member for opening from the inner periphery thereof so as to release a work piece from the tip of the chuck. SOLUTION: In the condition that a chuck device 20 is closed, a core member 23 is pushed by an actuator. With this operation, the core member 23 is moved downward by a length (a) in relation to a chuck tip 21A of a chuck member 21. Furthermore, when the actuator 25 pushes the core member 23, a housing member 22 is moved downward in relation to the chuck tip 21A of the chuck member 21, and pushing by a closing pressurizing part 22A of the housing member 22 in relation to the chuck tip 21A is released. Continuously, an opening pressurizing part 23A of the core member 23 pushes the chuck tip part 21A so as to open the chuck tip part 21A to the maximum extended diameter D1, and a screw part 4A of a tip of a piston rod 4 is released from a screw surface 21B of the chuck tip part 21A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck device for gripping a rod-like work such as a piston rod of a hydraulic shock absorber.

[0002]

2. Description of the Related Art As a conventional chuck device, a chuck member having a chuck tip portion capable of being elastically deformed in an opening direction,
There is known a chuck member having a housing member for pressing a chuck tip portion of the chuck member from the outer periphery to close the chuck member and holding the workpiece with the chuck tip portion. In such a chuck device, when the chuck member grips the workpiece, the housing member is moved relative to the chuck member in a direction in which the housing member presses the chuck distal end portion of the chuck member from the outer periphery, and the chuck distal end portion of the chuck member is closed. By doing so, it works so as to grab the outer periphery of the work. When releasing the work from the chuck member, the housing member is moved relative to the chuck member in a direction in which the housing member presses the chuck distal end of the chuck member from the outer periphery, and the chuck distal end of the chuck member acts as a spring. It works to release the work by elastically expanding with.

[0003]

However, the prior art has the following problems. The chuck tip is forcibly operated in one direction in the closing direction, but relies only on the elastic restoring force of the chuck member in the opening direction in the opposite direction, and lacks quickness and reliability of opening and closing. There is a fear.

The enlarged diameter of the chuck member at the tip end thereof is based on the natural return behavior due to the elastic restoring force of the chuck member, and it is difficult to increase the diameter. For this reason, when inserting a work into the expanded chuck tip of the chuck member, the work may collide with the inner periphery of the chuck tip. This has a disadvantage that, for example, when the outer periphery of the work is threaded, the threaded portion is damaged and the commerciality is impaired.

SUMMARY OF THE INVENTION An object of the present invention is to improve the speed and reliability of opening and closing of a chuck device, and to increase the diameter of the opening of the chuck tip.

[0006]

According to the present invention, there is provided a chuck device for gripping a bar-shaped work, comprising: a chuck member having a chuck tip portion capable of being elastically deformed in an opening and closing direction; and a chuck for the chuck member. A housing member for pressing the tip from the outer periphery to close it and gripping the workpiece with the chuck tip, and a core member for pressing the chuck tip of the chuck member from the inner periphery to open and release the workpiece from the chuck tip And an actuator for pushing and pulling the core member and the housing member in the direction of contact and separation with the chuck member. When the actuator pulls the core member and the housing member, a chuck tip of the chuck member The core member moves with respect to the portion, and the pressing of the core member against the tip end of the chuck is released. When the housing member presses the chuck tip to grip the workpiece and the actuator pushes the core member and the housing member, the housing member moves with respect to the chuck tip of the chuck member, and the housing member moves relative to the chuck tip. After the pressing of the housing member is released, the core member presses the tip end of the chuck to release the work.

According to a second aspect of the present invention, there is provided a chuck device for gripping a bar-shaped workpiece, wherein the chuck member has a chuck tip which can be elastically deformed in the opening and closing direction, and presses the chuck tip of the chuck member from the outer periphery. A housing member for closing and holding the workpiece with the chuck tip, a core member for pressing the chuck tip of the chuck member from the inner periphery to open and release the workpiece from the chuck tip, and the core member. The housing member is connected to the housing member by a pin, and the core member can be moved relative to the pin by a fixed length in the direction of contact with and separation from the chuck member, and the core member is pushed and pulled in the direction of contact and separation with the chuck member. An actuator that pulls the core member when the actuator pulls the core member. Material is moved from the pressing of the core member is released for the chuck tip, grasp the workpiece the housing member presses the chuck tip,
When the actuator pushes the core member, the housing member moves with respect to the chuck tip of the chuck member, and after the housing member is pressed against the chuck tip, the core member is moved to the chuck tip. Is pressed to release the work.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the housing member further includes a work introduction port through which a work is introduced into a chuck tip of the chuck member. A work guide having a chamfered tip around the work introduction port is provided, and the maximum expansion diameter of the chuck tip of the chuck member opened by being pressed by the core member is the diameter of the work introduction port of the housing member. It is designed to be set larger.

[0009]

According to the first and second aspects of the present invention, the following operations are provided. The chuck device includes both a housing member that closes the chuck member and a core member that opens. Therefore, the chuck tip portion of the chuck member is forcibly and positively driven in the opening and closing directions, so that the opening and closing speed and reliability can be improved.

The chuck distal end of the chuck member is forcibly expanded by the core member further from the natural expansion by the elastic restoring force, and the expanded diameter of the chuck distal end can be enlarged. Especially when there is a thread on the outer periphery of the work,
Usability can be improved, for example, the work can be introduced into the chuck tip without colliding with the outer periphery of the work.

According to the second aspect of the present invention, the following effects are obtained in addition to the above. The housing member was connected to a pin by which the core member pushed and pulled by the actuator could relatively move by a certain length. Therefore, the timing at which each of the core member and the housing member presses the chuck tip of the chuck member can be shifted using a single actuator, and the above can be realized with a simple configuration.

According to the third aspect of the present invention, the following operations are provided. The work introduction port of the housing member is provided with a work guide having a chamfered end, and the maximum opening diameter of the chuck tip of the chuck member is set to be larger than the diameter of the work introduction port of the housing member. The workpiece can be smoothly guided into the chuck member by being guided by the work guide of the housing member without a risk of colliding with the chuck tip in the expanded state.

[0013]

FIG. 1 is a schematic view showing a hydraulic shock absorber performance evaluation tester, FIG. 2 is a schematic view showing a chuck device, and FIG.
FIG. 4 is a schematic diagram showing a main part of FIG. 2, and FIG. 4 is a schematic diagram showing an operation process of the chuck device.

The hydraulic shock absorber performance evaluation tester 10 enables the performance of the hydraulic shock absorber 1 to be evaluated. In addition, the hydraulic shock absorber 1
As shown in FIG. 2, the inner cylinder 3 is inserted into the outer cylinder 2 having a bottomed cylindrical shape,
A piston rod 4 is slidably inserted into the inner cylinder 3, and a rod guide 5, a sealing member 6, and an end plate 7 are mounted on the upper end of the inner cylinder 3 in the outer cylinder 2. At this time, the hydraulic shock absorber 1 fills the inside of the inner cylinder 3 with oil as an oil chamber, forms an oil reservoir chamber and a gas chamber above the outer cylinder 2 and the inner cylinder 3, and The upper part of the inner cylinder 3 is sealed with the sealing member 6 described above.

As shown in FIG. 1, the tester 10
The outer cylinder 2 of the hydraulic shock absorber 1 is attached to a clamp base 12 that can move up and down along a slide guide 11 provided at a lower portion of the front surface of the hydraulic shock absorber 1.
Can be supported upright, and the clamp base 12 can be moved up and down by a clamp cylinder 13. The tester 10 also has a lifting head 15 that can move up and down along a slide guide 14 provided at the upper part of the front surface of the column 10 </ b> A. Connected.
The elevating head 15 has an automatic chucking device 20 having a load cell 19, and chucks the tip screw portion 4A of the piston rod 4 extending from the outer cylinder 2 of the hydraulic shock absorber 1 to the outside through the sealing member 6. The device 20 can be held.

Thus, in the tester 10, the vertical thread 4 A of the piston rod 4 of the hydraulic shock absorber 1, which is supported upright on the clamp base 12, is gripped by the chuck device 20 of the lifting head 15. The head 15 is moved up and down by the elevating motor 16, and the gas reaction force and the damping force of the hydraulic shock absorber 1 are measured from the expansion / contraction stroke of the piston rod 4 and the output value of the load meter 19.

However, the chuck device 20 is shown in FIGS.
As shown in FIG.
, Core member 23, pin 24, actuator 25
And

The chuck member 21 is a cylindrical body which is connected to a lower end surface of a cylinder 25A of an actuator 25 supported by the lifting head 15 via a load cell 19 and extends downward. The claw-shaped chuck tip 21A is circumferentially separated by a plurality of slits. The chuck tip 21A can be elastically deformed in the open / close direction (radial direction) in a free state, and the tip thread 4A of the piston rod 4 of the hydraulic shock absorber 1 is provided on the inner peripheral surface of the tip of the chuck tip 21.
Is provided with a screw surface 21B for biting and gripping.

The housing member 22 includes the chuck member 21
Is a cylindrical body fitted to the outer peripheral side of the chuck member 21.
Presses the chuck tip 21A from the outer periphery to close it,
The tip screw 4A of the piston rod 4 is gripped by the chuck tip 21A. As will be described later, the housing member 22 moves in the axial direction with respect to the chuck member 21, and presses the chuck tip 21A of the chuck member 21 from the outer periphery by a tapered closing pressing portion 22A at the tip thereof, thereby forming the chuck tip. 21A is reduced in diameter.

The core member 23 is a rod-like body fitted on the inner peripheral side of the chuck member 21. The core member 23 presses the chuck tip 21A of the chuck member 21 from the inner periphery to open the chuck member 21. Thread 4 at the tip of rod 4
Release A. The core member 23 moves in the axial direction with respect to the chuck member 21 as described later, and presses the chuck distal end portion 21A of the chuck member 21 from the inner periphery by a tapered opening pressing portion 23A at the distal end thereof. The diameter of the tip 21A is increased.

The pin 24 is inserted into the long hole 23B of the core member 23 and the hole 22B of the housing member 22 to connect them. The pin 24 can freely move up and down the slit 21C of the chuck member 21. At this time, the core member 23
Can move relative to the pin 24 by a fixed length a, which is the idling length of the long hole 23B, in the axial direction which is the direction of contact and separation with the chuck member 21.

The actuator 25 accommodates a piston 25B in a cylinder 25A and a core member 2 in the piston 25B.
3 are connected to each other so that the core member 23 can be pushed and pulled in the axial direction which is the direction of contact and separation with the chuck member 21. At this time, the actuator 25 is a double-acting cylinder device operated by a fluid pressure circuit (pneumatic circuit) using the 5-port solenoid valve 26 shown in FIG. 2A, or a 3-port electromagnetic device shown in FIG. A single-acting cylinder device of a spring force return operated by a fluid pressure circuit (pneumatic circuit) using the valve 27 can be provided.

Accordingly, in the chuck device 20, the chuck distal end 21A is opened while the actuator 25 presses the chuck distal end 21A of the chuck member 21 by the opening pressing portion 23A of the core member 23, and the chuck distal end 21A is opened. The tip screw 4A of the piston rod 4 can be inserted / extracted (FIG. 4C). Maximum expansion diameter D ₁ of the chuck tip 21A at this time is greater than the diameter D ₀ of the work introducing port 22C of the lowermost end of the housing member 22,
Work guide 22 with chamfered tip at work inlet 22C
It is possible to reliably prevent the tip screw portion 4A of the piston rod 4 inserted guided by D from colliding with the screw surface 21B of the chuck tip portion 21A (FIG. 4C).
Incidentally, the chuck tip 21A is a housing member 22 of the chuck member 21, the diameter D ₂ of the chuck tip 21A in a free state of not being pressed to both of the core member 23, the diameter D of the work introducing port 22C of the housing member 22 It is set substantially equal to ₀ (FIG. 4D).

In the chuck device 20, the actuator 25 is connected to the closing pressing portion 22 of the housing member 22.
The chuck tip 21A is closed while the chuck tip 21A of the chuck member 21 is pressed by A, and the tip screw 4A of the piston rod 4 can be gripped by the screw surface 21B of the chuck tip 21A (FIG. 4A). ).

Hereinafter, the chuck operation of the chuck device 20 will be described (FIG. 4). (1) The closing operation of the chuck device 20 from the open state (FIG. 4)
(C), (D), (A))

The core member 23 is pulled by the actuator 25 from the open state of the chuck device 20 shown in FIG. 4C (the chuck end 21A has the maximum expanded diameter D ₁ ). As a result, the core member 23 first has the length a (the long hole 2 of the core member 23) with respect to the chuck tip 21A of the chuck member 21.
Lower edge of the 3B hits up) moves up to the pin 24, the pressing of the pressing part 23A opening of the core member 23 relative to the chuck tip 21A is released (this time, the diameter of the chuck tip 21A becomes D ₂₎ (FIG. 4 (D)). afterwards,
Further, when the actuator 25 pulls the core member 23, the core member 23 further moves upward, and the housing member 22 is lifted upward via the pin 24. Is pressed to close the chuck tip 21A (the pull-up length b of the housing member 22), and the screw face 21B of the chuck tip 21A can grip the tip screw 4A of the piston rod 4 (FIG. 4A). .

(2) Opening operation of the chuck device 20 from the closed state (FIGS. 4A, 4B, and 4C) From the closed state of the chuck device 20 in FIG. Press 23. As a result, the core member 23 is first moved by the length a (the long hole 23 of the core member 23) with respect to the chuck distal end portion 21A of the chuck member 21.
The lower pressing portion 23A of the core member 23 does not yet press the chuck distal end portion 21A (until the upper edge of B contacts the pin 24). Further, when the actuator 25 presses the core member 23, the housing member 22 moves downward with respect to the chuck tip 21A of the chuck member 21, and the pressing of the closing pressing portion 22A of the housing member 22 against the chuck tip 21A is released. ,
Then, (the length b depressing of the housing member 22, the core member 23) to open the pressing portion 23A of the core member 23 presses the chuck tip 21A to open the chuck tip 21A to the maximum expanded diameter D _1, the chuck tip Screw surface 21 of part 21A
Release the tip thread 4A of the piston rod 4 from B (FIG. 4).
(C)).

Therefore, according to the present embodiment, the following operations are provided. The chuck device 20 includes both a housing member 22 that closes the chuck member 21 and a core member 23 that opens.
Therefore, the chuck tip 21A of the chuck member 21 is forcibly and positively driven in the opening and closing directions, so that the opening and closing speed and reliability can be improved.

The chuck tip 21 of the chuck member 21
A is forcibly expanded by the core member 23 further from the natural expansion by the elastic restoring force, and the expansion diameter of the chuck tip 21A can be enlarged. In particular, when the thread 4A is provided on the outer periphery of the work, the usability can be improved, for example, the work can be introduced into the chuck distal end 21A without colliding with the outer periphery of the work.

A pin 24 which allows the core member 23 pushed and pulled by the actuator 25 to relatively move by a certain length.
Was connected to the housing member 22. Therefore, the timing at which each of the core member 23 and the housing member 22 presses the chuck distal end portion 21A of the chuck member 21 can be shifted by using the single actuator 25, and the above-described configuration can be realized with a simple configuration.

Work inlet 22 of housing member 22
Provided with a bevel-shaped workpiece guide 22D and C, the workpiece inlet 22 of the maximum expansion diameter D ₁ of the chuck tip 21A of the chuck member 21 is the housing member 22
Since the diameter of the piston rod 4 is set larger than the diameter D ₀ of the chuck member 21, there is no fear that the piston rod 4 collides with the chuck tip 21 A in the expanded state of the chuck member 21.
Can be smoothly guided into the chuck member 21 by being guided by the work guide 22D of the housing member 22.

Further, in the above-described chuck device 20, the single actuator 25 pushes and pulls the housing member 22 and the core member 23 via the pin 24. However, in the present invention, (a) the housing member 22 and the core member 23 may be pushed and pulled by a single actuator 25 through another mechanical configuration instead of the pin 24, or (b) An actuator for the housing member 22 and an actuator for the core member 23 are separately provided, and the housing member 22,
The core member 23 may be pushed and pulled by these actuators.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, in the embodiment of the present invention, the actuator 25 included in the chuck device 20 is not limited to the cylinder device, but may be based on another mechanical configuration such as a gear drive.

[0034]

As described above, according to the present invention, it is possible to improve the quickness and reliability of opening and closing of the chuck device, and to increase the diameter of the opening of the chuck tip.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a hydraulic shock absorber performance evaluation tester.

FIG. 2 is a schematic view showing a chuck device.

FIG. 3 is a schematic view showing a main part of FIG. 2;

FIG. 4 is a schematic view showing an operation process of the chuck device.

[Explanation of symbols]

 Reference Signs List 20 chuck device 21 chuck member 21A chuck tip 22 housing member 22C work inlet 22D work guide 23 core member 24 pin 25 actuator

Claims (3)

[Claims] 1. A chuck device for gripping a rod-shaped workpiece, comprising: a chuck member having a chuck tip which can be elastically deformed in an opening / closing direction; and pressing the chuck tip from an outer periphery to close the chuck tip. A housing member for gripping the work by a core member for pressing the chuck tip of the chuck member from the inner periphery to open and release the work from the chuck tip, and the chuck member and the core member and the housing member. When the actuator pulls the core member and the housing member, the core member moves relative to a chuck tip of the chuck member, and the chuck tip After the pressing of the core member against the chuck member is released, the housing member presses the tip end of the chuck. When the actuator pushes the core member and the housing member, the housing member moves with respect to the chuck tip of the chuck member, and the pressing of the housing member against the chuck tip is released. A chuck device configured to press the tip of the chuck to release the work. 2. A chuck device for gripping a rod-shaped work, comprising: a chuck member having a chuck tip which can be elastically deformed in an opening and closing direction; and a chuck tip which is pressed from an outer periphery to close the chuck tip. A housing member for gripping the workpiece, a core member for pressing the chuck tip of the chuck member from the inner periphery to open the workpiece and releasing the workpiece from the chuck tip, and connecting the core member and the housing member with a pin. And
An actuator for moving the core member relative to the pin by a predetermined length in a direction of contacting and separating with the chuck member, and for pushing and pulling the core member in a direction of contacting and separating with the chuck member; When the actuator pulls the core member, the core member moves with respect to the chuck tip of the chuck member, and the pressing of the core member against the chuck tip is released. When the actuator presses the core member by pressing, the housing member moves with respect to the chuck tip of the chuck member, and the pressing of the housing member with respect to the chuck tip is released. A chuck device wherein a core member is configured to press the chuck tip to release a work. 3. The core according to claim 1, wherein the housing member has a work introduction port for introducing a work to a chuck tip of the chuck member, and a work guide having a chamfered tip around the work introduction port. The chuck device according to claim 1, wherein a maximum opening diameter of a chuck distal end portion of the chuck member opened by being pressed by the member is set to be larger than a diameter of a work introduction port of the housing member.