JPH08303587A - Running lever limiting device - Google Patents

Abstract

PURPOSE: To simply execute fitting and adjustment of a regulating member by inserting a regulating cylinder through a rod between the rings of a neutral holding device so as to regulate extension/contraction of the neutral holding device. CONSTITUTION: A running lever 2 controls a variable pressure oil pump 5, it is formed into a neary L-shape, the base end is provided on the fixed side capably of being inclined front and rear centering around a lateral shaft, it is provided with two arms 6, 7, and the arm 6 is connected with the swash plate lever 9 of the variable pressure oil pump 5 through an adjusting rod 8. A neutral holding device 3 is provided with a sleeve 10, a pair of rings 11,12 slidably received therein, a compression spring 13 interposed between them, a pair of first stoppers 14, 15 provided in the sleeve 10 and regulating movement of the rings 11, 12 in the parting direction, a rod 16 penetrating through the rings 11, 12, and a pair of second stoppers 17, 18 provided on it and regulating movement of the rings in the parting direction, and it is provided between the running lever 2 and the fixed side and always energizes the running lever 2 in the neutral position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a traveling lever limiting device applied to, for example, a skid steer vehicle.

[0002]

2. Description of the Related Art As a skid steer vehicle, for example, the one described in Japanese Utility Model Publication No. 63-17741 is known. This is basically an engine, a pair of variable hydraulic pumps (HST pumps) rotationally driven by the engine, and a pair of hydraulic motors (HST motors) hydraulically driven by these.
And a pair of travel levers that are tiltably movable back and forth to control the swash plate lever of the variable hydraulic pump, a pair of neutral holding devices that always hold each travel lever in a neutral position, and buffer the operation of each travel lever. It is composed of a pair of shock absorbers, and tilts each of the traveling levers back and forth from the neutral position to control the rotation direction and speed of each hydraulic motor via each variable hydraulic pump to drive and steer the vehicle. It has become. The neutral holding device basically includes a sleeve, a pair of rings slidably accommodated in the sleeve, a compression spring interposed therebetween, and a gap between the rings provided on the sleeve. It is composed of a pair of first stoppers for restricting the movement in the direction, a rod penetrating the both rings, and a pair of second stoppers provided on the rod for restricting the movement of the rings in the separating direction. As a traveling lever limiting device used in this type of vehicle, for example, the one shown in FIG. 5 is known. The travel lever limiting device 50 is a travel lever 5 that controls the variable hydraulic pump 51.
2 and a traveling lever 52 provided between this and the fixed side.
Is provided with a neutral holding device 53 that constantly urges the vehicle to a neutral position, and stoppers 54 and 55 that are provided on the fixed side and that regulate the forward and backward inclination of the traveling lever 52. However, since such a device directly regulates the forward and backward tilt of the traveling lever, a stopper, which is a regulating member, must be provided on the fixed side, and its attachment and adjustment are complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above problems in view of the above problems, and the purpose thereof is to easily attach and adjust the regulating member. The present invention is to provide a travel lever limiting device.

[0004]

A travel lever limiting device of the present invention basically comprises a travel lever for controlling a variable hydraulic pump, a sleeve, and a pair of rings slidably accommodated in the travel lever. A compression spring interposed therebetween, a pair of first stoppers provided on the sleeve for restricting the movement of both rings in the separating direction, a rod penetrating both rings, and a pair of rods provided on the rod. Both a neutral holding device provided with a pair of second stoppers for restricting the movement of the ring in the separating direction and provided between the running lever and the fixed side to constantly bias the running lever to the neutral position, and both rings of the neutral holding device. It is characterized in that it is composed of a restricting cylinder that is inserted through a rod located between and restricts the expansion and contraction of the neutral holding device.

[0005]

When the traveling lever is in the neutral state, the neutral holding device is set to the neutral state, the traveling lever is held in the neutral state, and the variable hydraulic pump is controlled to the neutral position. When the neutral holding device is in the neutral state, the respective rings are engaged with the first stopper and the second stopper, respectively, and at least one of the rings and the regulating cylinder are separated by a predetermined stroke. When the travel lever is tilted back and forth, the neutral holding device is expanded and contracted and the variable hydraulic pump is controlled to the forward and backward positions. When the neutral holding device is in the shortened state, the compression spring is compressed, and one ring and the second stopper, which are the same as the one ring and the other stopper, are engaged with the first stopper and the second stopper which are the same as the other ring. Further, the first stopper, which is the same as the other ring, is separated from each other, and the restricting cylinder and each ring are brought into contact with each other to be shortened by a predetermined stroke, and further shortening is restricted. When the neutral holding device is in the extended state,
The compression spring is compressed, and one ring and the second stopper that is the same as the other stopper and the other ring and the first stopper that is the same as the other ring are engaged with each other. The stopper is separated, the regulating cylinder and each ring are brought into contact with each other, and are extended by a predetermined stroke, and further extension is regulated.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a travel lever limiting device according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional side view showing a shortened state of the neutral holding device. FIG. 3 is a similar view showing a neutral state of the neutral holding device. FIG. 4 is a similar view showing the extended state of the neutral holding device. The travel lever limiting device 1 is composed of a travel lever 2, a neutral holding device 3, and a restricting cylinder 4 as main components. The traveling lever 2 controls the variable hydraulic pump 5. In this example, the traveling lever 2 is located on the left and right sides, and each has a substantially L shape, and the base end can be tilted forward and backward around the horizontal axis on the fixed side (vehicle body, etc.). And has two arms 6 and 7. One arm 6 is connected to the variable hydraulic pump 5 via an adjusting rod 8.
Is connected to the swash plate lever 9. Although not shown, a buffer device for buffering the operation of the traveling lever 2 is provided between the other arm 7 and the fixed side. Neutral holding device 3
Is a sleeve 10, a pair of rings 11 and 12 slidably accommodated in the sleeve 10, a compression spring 13 interposed therebetween, and a gap provided between the rings 11 and 12 provided in the sleeve 10. A pair of first stoppers 14 and 15 for restricting the movement in the direction, a rod 16 penetrated by both rings 11 and 12, and both rings 11 and 12 provided on the rod 16.
A pair of second stoppers 17 for restricting the movement of the
18 is provided between the traveling lever 2 and the fixed side to constantly urge the traveling lever 2 to the neutral position. In this example, the traveling lever 2 is provided in a substantially vertical state between the arm 7 and the fixed side. Therefore, the distance between the first stoppers 14 and 15 and the distance between the second stoppers 17 and 18 are the same. Sleeve 10
Has a cylindrical shape with a small diameter hole on the upper side (one side) and a large diameter hole on the lower side (other side), and a mounting hole 19 is formed on the upper side. The rings 11 and 12 have a washer shape and are slidably fitted in the large diameter holes of the sleeve 10. One of the first stoppers 14 is a step formed at the boundary between the small diameter hole and the large diameter hole of the sleeve 10, and the other first stopper 15
Is a snap ring fitted into the circumferential groove 20 formed in the sleeve 10. A head 21 is screwed on the lower side of the rod 16 and locked by a lock nut 22.
A mounting hole 23 is formed in the head 21. One second stopper 17 is a washer welded to the upper side of the rod 16, and the other second stopper 18 is a washer.
6 is a nut that is screwed to the lower side of the slider 6 for adjustment and movement, and is locked by a lock nut 24. The restricting cylinder 4 is inserted into a rod 16 located between both rings 11 and 12 of the neutral holding device 3 to restrict the expansion and contraction of the neutral holding device 3. In this example, the collar has a cylindrical shape, It has a length obtained by subtracting a predetermined stroke S from the inner ends of both rings 11 and 12 in the neutral state, and is loosely fitted to the rod 16 so as not to interfere with the compression spring 13.

Next, the operation will be described based on such a configuration. When the traveling lever 2 is in the neutral state, as shown in FIG. 1, the neutral holding device 3 is set in the neutral state, the traveling lever 2 is held in the neutral state, and the arm 6 and the adjusting rod 8 are held.
The swash plate lever 9 of the variable hydraulic pump 5 is controlled to the neutral position via. When the neutral holding device 3 is in the neutral state, FIG.
As shown in FIG. 1, each of the rings 11 and 12 has a first stopper 1
4, 15 and the second stoppers 17, 18 are fitted, the regulating cylinder 4 is fitted to the lower ring 12 by its own weight, and the upper ring 11 and the regulating cylinder 4 are separated by a predetermined stroke S. When the traveling lever 2 is tilted forward, the neutral holding device 3 is shortened and the arm 6 and the adjusting rod 8 are
The swash plate lever 9 of the variable hydraulic pump 5 is controlled to the forward position via. When the neutral holding device 3 is in the shortened state, FIG.
As shown in FIG. 1, the compression spring 13 is compressed, and the first stopper 14 which is the same as the upper ring 11 and the lower ring 1
While the second stopper 18 on the same side as 2 is engaged, the second stopper 17 on the same side as the upper ring 11 and the first stopper 15 on the same side as the lower ring 12 are separated from each other, and the regulating cylinder 4 and each ring 11, 12 are fitted and shortened by a predetermined stroke S, and further shortening is restricted. When the traveling lever 2 is tilted backward, the neutral holding device 3 is extended and the swash plate lever 9 of the variable hydraulic pump 5 is controlled to the reverse position via the arm 6 and the adjusting rod 8. When the neutral holding device 3 is in the extended state, as shown in FIG. 4, the compression spring 13 is compressed, and the second stopper 17 that is the same as the upper ring 11 and the first stopper 15 that is the same as the lower ring 12 are in contact with each other. The first stopper 14 that is the same as the upper ring 11 and the second stopper 18 that is the same as the lower ring 12 are separated from each other, and the regulating cylinder 4 and each ring 11,
12 are fitted and extended by a predetermined stroke S,
Further growth is restricted. Since the restriction tube 4 is inserted into the rod 16 located between the rings 11 and 12 of the neutral holding device 3 to restrict the expansion and contraction of the neutral holding device 3, no dedicated holding means for holding the restriction tube 4 is required. As a result, the regulation tube 4 which is the regulation member can be easily attached. Since the restriction tube 4 is inserted into the rod 16 located between the rings 11 and 12 of the neutral holding device 3 to restrict the expansion and contraction of the neutral holding device 3, it is possible to perform a predetermined operation by processing the end surface of the restriction tube 4. The stroke S can be easily obtained, and the regulation cylinder 4 as the regulation member can be easily adjusted. Both rings 1 of the neutral holding device 3
Since the restricting cylinder 4 is inserted into the rod 16 located between 1 and 12 to restrict the expansion and contraction of the neutral holding device 3, only one restricting cylinder 4 as the restricting member is required, and the number of parts is reduced accordingly. The structure is simplified.

Incidentally, the neutral holding means 3 is, in the previous embodiment,
Although the travel lever 2 is shortened when it is tilted forward and is extended when it is tilted backward, the invention is not limited to this. For example, conversely, it may be stretched when it is tilted forward and shortened when it is tilted backward. . Although the neutral holding means 3 is provided in a substantially vertical state in the above embodiment, the neutral holding means 3 is not limited to this and may be provided in a substantially horizontal state, for example.

[0009]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) It is composed of a traveling lever, a neutral holding device, and a restricting cylinder, and in particular, since the restricting cylinder is inserted into a rod located between both rings of the neutral holding device, the expansion and contraction of the neutral holding device is restricted. Easy installation and adjustment of parts. (2) Since the restricting cylinder is inserted into the rod located between both rings of the neutral holding device to restrict the expansion and contraction of the neutral holding device, only one restricting cylinder as the restricting member is required, and the number of parts is that much. It is reduced and the structure is simplified.

[Brief description of drawings]

FIG. 1 is a side view showing a travel lever limiting device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a shortened state of the neutral holding device.

FIG. 3 is a similar view showing a neutral state of the neutral holding device.

FIG. 4 is a similar view showing an extended state of the neutral holding device.

FIG. 5 is a side view showing a conventional travel lever limiting device.

[Explanation of symbols]

1, 50 ... Traveling lever limiting device, 2, 52 ... Traveling lever, 3, 53 ... Neutral holding device, 4 ... Restricting cylinder, 5, 51 ...
Variable hydraulic pump, 6, 7 ... Arm, 8 ... Adjusting rod, 9
... swash plate lever, 10 ... sleeve, 11, 12 ... ring,
13 ... compression spring, 14, 15 ... first stopper, 1
6 ... Rod, 17, 18 ... Second stopper, 19, 23 ...
Mounting hole, 20 ... Circumferential groove, 21 ... Head, 22, 24 ... Lock nut, 54, 55 ... Stopper, S ... Stroke.

Claims (1)

[Claims] 1. A travel lever for controlling a variable hydraulic pump, a sleeve, a pair of rings slidably accommodated in the sleeve, a compression spring interposed therebetween, and a sleeve. Traveling is provided with a pair of first stoppers for restricting the movement of both rings in the separating direction, a rod penetrating the both rings, and a pair of second stoppers provided on the rod for restricting the movement of the rings in the separating direction. A neutral holding device that is provided between the lever and the fixed side and that always urges the traveling lever to the neutral position, and a rod that is inserted through a rod located between both rings of the neutral holding device to restrict expansion and contraction of the neutral holding device. A travel lever limiting device characterized by being configured with a cylinder.