KR200176292Y1 - Centering device of control lever - Google Patents

Abstract

The present invention is simple in configuration by reducing the number of components perturbing with the inner diameter of the housing, improved durability by using a single push rod, the operation lever can be connected to both ends of the push rod, as well as It can reduce the restoring force and inertia force, prevent the shaking and maintain the stability of the vehicle, and provide the control lever centering device with damper function.

The centering device has an inner diameter portion 12 having a first taper portion 12b and a second taper portion 12c, which are formed so as to increase in diameter from both the central portion 12a of the small diameter toward both sides, and are formed at both ends. A housing 10 in which the first cover member 14 and the second cover member 16 are installed; One end is operatively connected to the operation lever, the other end is connected to a work device, and is installed to be movable in the inner diameter portion 12 of the housing 10 through the respective cover members 14 and 16. A push rod 26; A guide 28 fixed to the push rod 26 and perturbed in the central portion 12a of the inner diameter portion 12 of the housing 10 as the push rod 26 moves; And

The first compression spring 34 and the second compression spring 36 are installed between the guide 28 and the respective cover members 14 and 16 to apply a preload.

Description

Control lever centering device {CENTERING DEVICE OF CONTROL LEVER}

The present invention relates to a control lever centering device, and more particularly, it is possible to reduce the number of parts, the structure is simple, can prevent the shaking when the control lever returns to the neutral position, can maintain the stability of the vehicle and damper function It relates to a control lever centering device having a.

Generally, but not limited to, heavy equipment such as skid steer loaders, forklifts, excavators, cranes and the like is provided with a variety of operation levers that can perform various operations or control the running. Such an operation lever may be installed in the work device W or the traveling operation system as schematically shown in FIG. 1, and the operation lever 1 is loaded with one side for returning to the neutral position after its operation. The centering device 2 is fixed to (L) and the other side is fixed to the frame of the work device W is spoken.

This general centering device 2 basically comprises a cylindrical housing 3, as shown in FIG. 2. Two guides 4, 5 are perturbed in the housing 3, and each guide 4, 5 is formed in the same shape and is symmetrical or opposed to each other. On the other hand, one end of the push rod 6, which can be fixed to the fixed frame of the work device or the operating lever 1, is inserted in one guide 4 of each guide. One end of the connecting rod 7 whose one end is connected to the guide 5 is fixed to the end of the push rod 6. Accordingly, the respective guides 4 and 5 are movably connected to each other by the push rod 6 and the connecting rod 7. In addition, compression springs 8 are provided between the guides 4 and 5 for mutual elastic operation. Of course, the cover 9 is provided on one side of the housing, ie, on the opposite side to which the push rod 6 is installed, so that it can be fixed to the operating lever or the fixing frame of the work device.

As shown in FIG. 1, the centering device configured as described above includes a push rod 6 fixed to a fixed frame of the work device W and a cover 9 connected to the operation lever 1 by a rod L. It can be addressed to work tools or steering systems. At this time, in the normal state, that is, the state in which the operating lever 1 is located in the neutral position, each of the guides 4 and 5 is completely positioned at both ends of the inside of the housing 3 by the compression spring 8. To be installed.

In this state, when the driver operates the operation lever 1, the housing 3 is pulled or pushed by the rod L and the cover 9 connected to the operation lever 1, and at this time, the push rod 6 moves relative to the housing 3. When the push rod 6 is compressed into or tensioned from the housing 3, the compression spring 8 interlocked between each guide 4, 5 is compressed by one of them guides 4, 5. do. Then, when the driver releases or moves to the neutral state without fixing the operation lever 1, that is, when the operation force is removed from the push rod 6, the push rod 6 is the expansion force of the compression spring (8) That is, it returns to a neutral position by restoring force.

However, in such a conventional centering device, even after the push rod is returned to the neutral position, the operating lever does not stop at the neutral position at once at once due to the residual elastic force of the compression spring and the residual movement of the housing relative to the push rod. There is a problem in that it is not swinging, resulting in the instability of the operation of the hydraulic work device or the traveling system and the instability of the vehicle body.

In addition, such a conventional centering device is essentially required to have two guides perturbing in the housing, thereby increasing the number of parts and complicated configuration, as well as the push rod is installed in only one direction, so that only one operating lever is centered. In addition, there was a problem that the mounting of the control lever or the frame of the working device is limited.

On the other hand, in recent years, in order to solve the problems as described above, the operating lever centering apparatus having a damping function as shown in Figure 3 has been proposed. The centering device is provided with a housing (H) having an inner diameter portion, a cover (C) mounted on both ends of the housing (H), and a guide (G) which can be perturbed in the inner diameter portion of the housing (H). The rod P and the compression spring S for pressing both sides of the guide G are comprised.

In the centering device configured as described above, for example, the housing H is fixed to the frame of the work device and the push rod P is connected to the operation lever, thereby completing the installation. In this installation state, when the driver operates the operation lever, the push rod P is selectively moved along the axial direction of the housing H, and the guide G is also perturbed by the inner diameter of the housing at the same time. Thereafter, when the driver stops the operation and moves the operation lever to the neutral position, the guide G is returned to the initial state by the differential pressure of the compression springs S on both sides of the guide G, and the push rod P is returned to its original state. By returning, the operation lever is restored to the neutral position.

However, when the push rod returns to its original position, the guide G and the push rod P are swung by the continuous compression and expansion of the compression springs S provided on both sides of the guide G, thereby operating. There is a problem that the lever does not stop at the neutral position at a moment and swings, and as a result, there is still a problem that the operation of the work device and the instability of the vehicle body are caused.

The present invention is devised to solve the above problems, the object of the present invention is to reduce the inertial force when moving to the neutral position of the operation lever to prevent its rocking and vibration to maintain the stability of the operating lever and the vehicle body and An operating lever centering device having a damping function is provided.

Another object of the present invention is to provide a control lever centering device that can reduce the number of parts, the configuration is simple, and the mountability to the control lever or the work device is improved.

1 is a schematic view showing a state in which the operation lever is installed on the work device.

2 is a cross-sectional view of a conventional operating lever centering device used in FIG.

Figure 3 is a cross-sectional view of the control lever centering device according to another embodiment of the prior art.

Figure 4a is a cross-sectional view of the operating lever centering device according to the present invention.

4B is an enlarged cross-sectional view of a portion 'B' of FIG. 4A.

♣ Explanation of symbols for the main parts of the drawing ♣

1: operating lever 10: housing

12: internal diameter 12a: central portion

12b, 12c: Taper 14, 16: Cover member

18,20: Gasket 22,24: Wear ring

26: pushroad 28: guide

29: orifice 30: retaining ring

32: wear ring 34,36: compression spring

These objects are provided between the work device and the control lever so as to increase the diameter toward both sides from the central portion 12a of the small diameter in the centering device which acts elastically to help return the control lever to the neutral position. A housing having an inner diameter portion having a first taper portion and a second taper portion, and having a first cover member and a second cover member installed at both ends thereof; A push rod having one end operatively connected to the operation lever and the other end connected to a working device, the push rod being movably installed within the inner diameter of the housing through the respective cover members; A guide fixed to the push rod and perturbed in the center of the inner diameter portion of the housing according to the movement of the push rod; And a first compression spring and a second compression spring installed to apply a preload pressure between the guide and the respective cover members, respectively.

Preferably, the housing is filled with a working fluid, the guide is further characterized in that the orifice is formed to communicate the inner diameter portion nutrients by the guide.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment according to the present invention will be described in detail.

Referring to Figure 4, the operating lever centering device according to the present invention is basically mountable to the fixed frame of the working device, both ends are formed and the inner diameter portion 12 is formed to be filled with fluid such as air or pressure oil And a housing 10. In particular, two tapered portions, i.e., the first tapered portion 12b and the second tapered portion 12c, are formed on both sides of the inner diameter portion 12 centered on the small diameter central portion 12a. Each tapered portion 12b; 12c is preferably convergent to have a larger diameter to a predetermined range toward both sides of the inner diameter portion of the central portion 12a. Accordingly, the shape of the inner diameter portion 12 takes a shape in which the central portion 12a is convexly formed toward its longitudinal central axis.

The cover members 14 and 16 are respectively attached to both ends of the housing 10 by bolts with the gaskets 18 and 20 interposed therebetween. In addition, each cover member 14; 16 is provided with a wear ring 22; 24 for sliding between them and the push rod described below.

In addition, each cover member (14; 16), as well as the inner diameter portion 12 of the housing 10, the push rod 26 through which they can be connected or fixed to the operating lever at both ends is capable of reciprocating. Is inserted.

In addition, the push rod 26 is provided with a guide 28 movable in the inner diameter portion 12 of the housing 10. In particular, the guide 28 has an orifice 29 formed therein for communicating with both sides of the inner diameter portion 12 with the guide as the center. It is preferable that there are a plurality of orifices 29, and the exact number and size thereof are suitably set according to the capacity and size of the damper device. The guide 28 is preferably firmly fixed to the push rod 26 by the retaining ring 30. In addition, the guide 28 is formed with a groove 28a around the circumference, and the groove 28a has a wear ring 32 for sliding between the guide 28 and the surface of the inner diameter portion 12 of the housing 10. Is preferably installed.

On the other hand, two compression springs, that is, the first compression spring 34 and the second compression spring 36, which press the guides in opposite directions to each other, are installed on both sides of the guide 28 fixed to the push rod 26. It is. More specifically, a first compression spring 34 is inserted between the first cover 14 fixed to one side of the housing 10 and one side of the guide 28, and correspondingly to the other side of the housing 10. A second compression spring 36 is inserted between the fixed second cover 16 and the other side of the guide 28. In addition, the expansion force or preload force of each spring 34; 36 is such that the guide 28 is located at the center of the inner diameter portion 12 of the housing 10 when it is in a normal state, that is, when the operating lever is in the neutral position. It is preferable to be set. Of course, the application of the preload force to each of the springs 34 and 36 inserts the respective springs from both sides of the inner diameter portion 12 of the housing 10 and then replaces the respective cover members 14 and 16. By pressing the spring.

Hereinafter, the installation method and the operation mode of the centering device according to the present invention will be described in detail.

The operator first mounts the housing 10 to the frame of the working device, for example, and then connects the operation lever as shown in FIG. 1 to the push rod 26. If necessary or in accordance with the configuration of the work device, the operating lever may be connected and fixed to both ends of the push rod 26, respectively. In any case, in the initial installation state, i.e., with the operating lever in the neutral position, the guide 28 is formed at the center of the inner diameter portion 12 of the housing 10 by the respective compression springs 34 and 36. The compression spring receives the preload set for the first time and maintains the stopped state. That is, the guide 28 is in contact with the central portion 12a of the inner diameter portion 12 of the housing 10.

In this state, when the driver operates the operation lever, the push rod 26 connected to the operation lever moves in one direction or the other direction along the axial direction of the housing 10. For example, in the initial state, when the push rod 26 moves in the direction of the arrow A1, the guide 28 fixed to the push rod 26 also moves in the direction of the arrow A1, so that the first compression spring 34 ) Is further compressed, while the second compression spring 36 is expanded. Conversely, when the push rod 26 moves in the direction of the arrow A2, the guide 28 fixed to the push rod 26 also moves in the direction of the arrow A2, so that the second compression spring 36 further moves. While compressed, the first compression spring 34 is inflated. Of course, when the driver repeatedly operates the operating lever repeatedly, it is obvious that the push rod 26, the guide 28, and the respective springs 34 and 36 also operate continuously and repeatedly as described above. When 28 moves from side to side in center 12a or in each of tapered portions 12b and 12c, fluid such as air or pressure oil is opposed to the direction of movement of guide 28 through orifice 29 formed in guide 28. It flows through in the direction.

Thereafter, when the driver stops the operation lever and releases the operation lever freely or moves to the neutral position, the respective compression springs 34 and 36 installed on both sides of the guide 28 installed on the push rod 26 are moved. By this, the guide 28 is returned to the initial state. That is, the guide 28 moves toward the relatively expanded compression spring by the differential pressure between the first compression spring 34 that presses one side of the guide 28 and the second compression spring 36 that presses the other side of the guide. As the push rod 26 moves in the same direction, the working fluid in the inner diameter portion 12 flows in a direction opposite to the movement direction of the guide through a gap between the guide 28 and the inner diameter portion 12. do.

However, when the guide 28 reaches each of the tapered portions 12b; 12c formed in the inner diameter portion 12, as the clearance between the guide 28 and the inner diameter portion 12 becomes smaller gradually, the guide 28 Movement is restricted. Subsequently, when the taper portions 12b and 12c are finally moved from the tapered portions 12b and 12c to the central portion 12a by the compression springs 34 and 36, the fluid penetrates through the orifices 29 formed in the respective guides 28. The movement of the 28 and the push rod 26 is to continue slowly and continuously.

In this way, even if the guide 28 moves by the preload force of the compression springs 34 and 36, its elastic restoring force is attenuated by the flow path resistance by the orifice 29 as described above. Accordingly, the guide 28 is returned to the central portion 12a of the inner diameter portion 12 of the housing 10 and the push rod 26 is also returned to its original position, whereby the operating lever connected to the push rod is applied with a restoring force. Will be restored to its neutral position.

As a result, the compression spring, the push rod and the housing due to the resistance of the flow path at the moment when the push rod 28 or the guide 26 returns to its original position, that is, the flow resistance of the fluid by the orifice 29 formed in the guide 28. The restoring force of the control lever is attenuated, and ultimately, the restoring force and inertia force of the control lever are attenuated to prevent its oscillation and vibration, thereby centering the control lever into a stable neutral position.

As a result, according to the operating lever centering device according to the present invention, upon returning to the neutral position of the operating lever, the guide moves quickly toward the home position by the compression spring, but later slowly moves by the taper part. As a result of the flow resistance of the fluid is generated and eventually the restoring force of the push rod and the compression spring is attenuated, it is possible to prevent the swing and vibration of the operating lever as well as to maintain the stability of the vehicle.

In addition, the configuration is simple by having only a single guide, there is an advantage that the push rod is configured in both directions to improve the mounting.

Claims (2)

In the centering device which is installed between the work device and the operating lever to apply an elastic force to help return the operating lever to the neutral position, The inner diameter part 12 which has the 1st taper part 12b and the 2nd taper part 12c which are formed so that a diameter may become large toward both sides from the small diameter center part 12a is formed, and the 1st cover is provided in both side ends. A housing 10 in which the member 14 and the second cover member 16 are installed; One end is operatively connected to the operation lever, the other end is connected to a work device, and is installed to be movable in the inner diameter portion 12 of the housing 10 through the respective cover members 14 and 16. A push rod 26; A guide 28 fixed to the push rod 26 and perturbed in the central portion 12a of the inner diameter portion 12 of the housing 10 as the push rod 26 moves; And And a first compression spring (34) and a second compression spring (36) installed to apply a preload force between the guide (28) and the respective cover members (14, 16), respectively. 2. The guide (28) further comprises an orifice (29) to fill the housing (10) with a working fluid and to communicate the inner diameter portion (12) which is bisected by the guide (28). Operation lever centering device, characterized in that formed.