JPH03250313A - Controller for hydraulic reduction gear - Google Patents

Abstract

PURPOSE:To ensure the smooth control of revolution by providing the rocking plate to the rotary shaft of a control lever and a control lever, and securing the linking between the link lever pivots of both rocking plates and the link lever pivot of the control lever via the link levers, respectively. CONSTITUTION:The rocking plates 3 and 4 are pivoted at both sides of a control lever 1 in its turning direction and with the prescribed distances secured from the rotational fulcrum 1a of the lever 1 so that both plates 3 and 4 are turned in the turning direction of the lever 1. Then a spring 6 is set over both plates 3 and 4 and the contacts are secured between both plates 3 and 4 and the lever 1 when this lever is set at its neutral position. The link lever pivots 3c and 4c of both plates 3 and 4 are set on a plane including a rotary shaft 1a of the lever 1 and a link lever pivot 2b of a control lever 2. Then the linking is secured between the pivots 3c/4c and the pivot 2b via the link levers 7 and 8. Thus the smooth control of these levers can be secured to the forward or reverse side from the neutral side, furthermore the subsequent rotational speed can be controlled steplessly and smoothly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a hydraulic transmission in which a control lever is actuated by operating a control lever, and the forward and reverse rotation of an output shaft and the rotational speed thereof can be varied steplessly. This relates to control devices for machines, etc.

[Conventional technology]

Conventionally, there is a control lever that seamlessly switches the output shaft of a transmission from a neutral position to forward or reverse rotation, and an operation that is linked to this control lever via a link rod to operate the control lever. 2. Description of the Related Art Control devices for hydraulic transmissions and the like are known, which include a lever.

As this type of hydraulic transmission (closed circuit type), as shown in FIG. 5, a hydraulic transmission A has an input shaft B1 and an output shaft C.
A control lever D is provided to change the forward/reverse rotation of the output shaft C and control the rotation speed steplessly, and this control lever D is linked with an operating lever E provided separately from the control lever D by a link rod F. Then, the control lever D is rotated by the control lever E via the link rod F, and the output shaft C is rotated in the normal direction.

There is one that performs reverse rotation and controls each rotation speed. A hydraulic transmission with this configuration is
This transmission mechanism is suitable for agricultural machinery and the like where it is desirable to control the rotational speed according to the working conditions, and in recent years it has been adopted in a variety of models.

[Problem to be solved by the invention]

By the way, in the above hydraulic transmission, the control lever D
When the hydraulic transmission is switched from the neutral position to the forward rotation side or the reverse rotation side, the control at the time of initial movement is extremely sensitive, and the control and adjustment range is narrow. The vehicle started and stopped suddenly, making smooth starting and stopping operations difficult. In order to solve these problems, it is desirable to have a control device in which the operating angle (rotation angle) of the control lever is smaller than the operating angle (rotation angle) of the control lever on the operating side. The present applicant proposed a control device for solving the above-mentioned problems (issues) in Japanese Utility Model Application Publication No. Hei-116824. In this proposal, the operating angle of the operating lever on the operating side (
The operating angle (rotation angle) of the control lever was small compared to the rotation angle (rotation angle), and the desired purpose could be achieved. Since it was installed at an intermediate position between the rods and used a cam mechanism, it had the disadvantage of a complicated structure.

The present invention was made to solve the above problems,
It is an object of the present invention to provide a control device for a hydraulic transmission, etc., which has a relatively simple configuration and can perform desired control.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a control lever that continuously controls the output shaft of a transmission from a neutral position to a forward rotation side or a reverse rotation side, and a link rod to this control lever. A control device for a hydraulic transmission, etc., comprising: an operating lever that operates a control lever;
A friction plate is located on both sides of the operating lever in the rotational direction, is spaced a predetermined distance from the rotational fulcrum of the operating lever, and is pivotally supported so as to rotate in the same direction as the rotational direction of the operating lever. A spring is installed on both rocking plates to draw them toward the operating lever, and when the operating lever is in the neutral position, the inner sliding plate is attached to the operating lever, and the rotating shaft of the operating lever and the control lever are connected to each other. A link rod pivot shaft is provided on both swing plates, and the link rod pivot shaft of the inner moving plate and the link rod pivot shaft of the control lever The feature is that the two are connected by a link rod.

[For production]

With the above configuration, the operating angle of the control lever changes slightly with respect to the operating angle of the operating lever, and the control lever can be smoothly controlled from the neutral position to the forward rotation side or the reverse rotation side, and the subsequent rotation speed can be controlled. Can be controlled smoothly in stages.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an operating lever rotatably supported in the front and back directions in the drawings by a rotation axis la;
Although not shown, reference numeral 2 denotes a control lever that is supported via a drive shaft 2a in a well-known hydraulic transmission having an input shaft and an output shaft, and allows stepless switching of forward and reverse rotation of the output shaft and control of the rotation speed. , are provided a predetermined distance apart from the operating lever l. On both the front and rear sides of the operating lever ■, there are a pair of friction plates 3.4 that are shaped like a right triangle when viewed from the side. The pivot shaft 3a+4 is positioned on a horizontal line passing through the lower edge of the lever 1, and its upper acute corner is attached to a pair of support plates 5.5 that are fixed to the operating lever l and protrude in the front-rear direction.
It is pivotally supported via a.

A tension spring 6 is suspended at the lower part of the oblique side of the sliding plates 3 and 4 on the negative side in the left-right direction through locking pins 3b and 4b, and pulls the sliding plates 3 and 4 toward the operating lever 1 side. It's as strong as it is. Furthermore, pivot shafts 3c and 4c are protruded from the lower end portions of the oblique sides on the left and right outer sides of the friction plate 3.4, respectively, and the pivot shafts 3c.

4c and a pivot shaft 2b protruding from the upper end of the control lever 2 on both left and right sides are linked by link rods 7 and 8. The diaphragms 3 and 4 are located on both sides of the operating lever I in the rotating direction, are spaced apart from the rotating shaft 1a of the operating lever I by a predetermined distance above, and in the same direction as the rotating direction of the operating lever I. The pivot shaft 3a is attached to the support plates 5, 5 so as to rotate.
, 4a. Also, the first
As shown in the figure and FIG. 2, with both the swing plates 3 and 4 attached to the operating lever l, the operating lever l and the control lever 2 are in the neutral position, and from this neutral position, as shown in FIG. As shown in Figure 4, when the operating lever 1 is rotated counterclockwise, the output shaft rotates forward (in the case of a vehicle, it rotates forward), and when the operating lever 1 is rotated clockwise, as shown in Figure 4. is designed to reverse the output shaft (reverse in the case of a vehicle).

In a control device such as a hydraulic transmission with such a configuration,
As shown in FIGS. 1 and 2, when the operating lever 1 and the control lever 2 are in an upright state, they are in a neutral position, and the output shaft has stopped rotating.

Then, move the operating lever 1 counterclockwise by θ as shown in Figure 3.
When rotated, the rotation axis 1a of the pivot shaft 4c.

The amount of displacement in the direction of the pivot shaft 2b is 4c@1a (1-cosθ)
Therefore, the closer to the neutral position, the smaller the amount of displacement of the pivot shaft 2b becomes. In this case, the diaphragm 3 on the side of the pivot shaft 3a is pushed by the link rod 7 and is separated from the operating lever l.

Further, when the operating lever l is rotated by α degrees clockwise as shown in FIG.
・2a(1-cosα). In this state, the pivot shaft 4a
The side diaphragm 4 is pulled away from the operating lever l by the link rod 8. Therefore, the control lever 2 is rotated and controlled while changing the interval R between the pivot shafts 4a and 4c and the interval γ between the pivot shafts 3a and 3c relative to the rotation angle of the operating lever 10, thereby controlling the agricultural vehicle. When running, the running and stopping operations are performed smoothly, and before stopping, the spring 6 works to ensure that the machine is held in the neutral position.

〔Effect of the invention〕

As explained above, according to the control device for a hydraulic transmission, etc. of the present invention, even when the operating angle of the control lever is increased, the rotation angle of the control lever is minute, and the rotation angle of the control lever is small, and the control device moves from the neutral position to the forward rotation side or to the reverse rotation side. Control to the side is performed smoothly, and smooth rotation control is possible.

Therefore, when this device is used in a driving transmission,
It allows for smooth forward/backward switching, acceleration, and deceleration for safe driving.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIGS. 3 and 4 are diagrams for explaining the operation, and FIG. 5 is a side view of a conventional example. l...operation lever, la...rotation shaft, 2...control lever 2a...drive shaft, 3, 4...diaphragm, 3a+
4a, 3c+ 4c... Pivot shaft, 5... Support plate, 6 River spring, 7, 8... Link rod.

Claims (1)

[Scope of Claims] A control lever that controls steplessly switching the output shaft of a transmission from a neutral position to a forward rotation side or a reverse rotation side, and a control lever that is linked to the control lever via a link rod. A control device for a hydraulic transmission, etc., comprising: a control lever for operating a hydraulic transmission;
A swinging plate is pivoted so that it rotates in the same direction as the operating lever, and springs are installed on both swinging plates that act to pull each other toward the operating lever, so that when the operating lever is in the neutral position, Both rocking plates are attached to the operating lever, and both rocking plates are provided with link rod pivot shafts located on a plane including the rotating shaft of the operating lever and the link rod pivot shaft provided on the control lever, A control device for a hydraulic transmission, etc., characterized in that the link rod pivot shaft of both of the rocking plates and the link rod pivot shaft of the control lever are linked by a link rod.