JPH068910Y2 - Operation part of clutch brake of work vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to the operation of a traveling hydraulic brake by interlocking an operating pedal that can swing back and forth with a clutch operating control valve of a hydraulic traveling continuously variable transmission. The present invention relates to an operation unit for a clutch brake of a work vehicle in which an interlocking device that interlocks the operation pedal is provided in a system.

[Conventional technology]

In the above-mentioned conventional operation portion, in order to form the interlocking device, the first pivot boss of the operation pedal and the second pivot boss of the lever member provided in the operation system are in contact with each other and the contact piece and the cover. A separate abutment piece is provided, and only one abutment surface that abuts in one of the reciprocating rotation directions of the abutment piece so that the hydraulic brake is braked in accordance with the operation of the operation pedal. It was formed on the contact piece.

[Problems to be solved by the invention]

However, with the release of the operation on the operation pedal,
Since the contacting piece and the contacted piece do not contact each other, the control valve returns the clutch to the engaged state by the return spring of the operation pedal, but the hydraulic brake does not reliably return to the non-braking state. The brake operation system must be provided with a return spring dedicated to the hydraulic brake in order to eliminate rattling, and there is a drawback that the operation of the operation pedal against the urging force of the return spring becomes heavy.

An object of the present invention is to make it easier to depress the operation pedal.

[Means for solving problems]

The characteristic structure of the operating portion of the clutch brake of the working vehicle according to the present invention is that the first pivot boss of the operating pedal and the second pivot boss provided in the operating system are formed on the same axis to form the interlocking device. A contact piece and a contact piece that contact each other are separately provided on the first and second pivot bosses, respectively, and the contact piece is reciprocally rotated about the axis in the reciprocating direction. The abutting piece is formed with two abutting surfaces that abut the abutting piece, respectively, and the operation and effect thereof are as follows.

[Action]

That is, the control valve is in the clutch disengaged state as the operation pedal is depressed, and the first and second pivot bosses are brought into contact with each other by the contact between the contact piece and one of the contact surfaces of the contact piece. When the hydraulic brake is brought into a braking state by releasing the operation of the operating pedal and is returned by releasing the operation pedal, the control valve enters the clutch engagement state and the other contact of the contact piece and the contact piece is released. Due to the contact with the immediate state, the hydraulic brake is forcibly returned to the non-braking state.

[Effect of device]

Therefore, even if the return spring dedicated to the hydraulic brake is not provided, the return spring provided on the operation pedal can be used to reliably bring the operation pedal into the non-braking state without rattling the operation system, and depressing the operation pedal against the urging force of the return spring. It can be operated lightly, and since it only has to form two abutting surfaces for the abutting piece on the abutting piece, it can be easily and compactly modified, and the operability for the clutch brake of the work vehicle is easy. I was able to improve.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 4, a traveling machine body (3) equipped with front wheels (1) is provided with a shovel working device (8) on the front side of the front part, and a traveling machine body (3) provided with rear wheels (2). At the top of the rear part, the boarding section
(10) is provided to form a body-folding type shovel loader.

The excavator work device (8) is composed of the traveling machine body.
A pair of left and right arms (4) and (4) extend from (3) toward the front of the machine so as to be vertically swingable around the axis (P ₂ ), and the both arms (4) and (4) respectively. In the above, a hydraulic cylinder (5) for arms is erected and connected between it and the traveling machine body (3), and brackets (11) and (11) are respectively provided across the tips of the arms (4) and (4). And excavator (6) swingably up and down around the shaft center (P ₃ ) and detachably attached, and the longitudinal intermediate portions of both arms (4) and (4) are integrally connected. At a substantially central position of the portion (4A), a longitudinally intermediate portion of the tilt arm (7) is pivotally supported, and a link member is provided between one end of the tilt arm (7) and the bracket (12) attached to the shovel (6). (13) detachably interlockingly connected, tilt arm
A tilt cylinder (9) for excavating the excavator up and down is provided between the other end of (7) and the traveling machine body (3), so that the excavator (5) is driven and swung by the hydraulic cylinder (5). The excavator (6) is driven and rocked by a tilting operation (6) of the tilt arm (7) and a link member (13).

As shown in FIGS. 1 to 3, an operation pedal (14) is provided on the lower support frame (22) of the boarding operation unit (10) so as to be swingable back and forth, and the operation pedal (14) is provided with a return spring. The control valve (CV) for operating the clutch of the hydraulic continuously variable transmission (HST) in response to the stepping operation against the urging force of (15).
So that the clutch can be switched from the clutch-engaged operation state to the clutch-disengaged operation state via the link member (16).
An interlocking device (18) for interlocking the operation pedal (14) with the operation system (17) of the traveling hydraulic brake (B) is provided by interlocking the control valve (CV).

The operation system (17) is a lever member (17A) that can swing back and forth.
Is connected to the push-pull rod (17B) of the master cylinder (19) of the hydraulic brake (B) in an interlocking manner, and in forming the interlocking device (18), the first pivot of the operation pedal (14) Support boss (20) and second pivot boss (21) of lever member (17A)
Is fixed to the support frame (22) attached to the machine body (3).
The contact piece (24) and the contacted piece (25) which are placed on the same axis (Q) by being externally fitted to 3) and contact each other, are attached to the first and second pivot bosses (2).
Provided separately on the end faces of (0) and (21), the contact piece (2
In the reciprocating rotation direction of 4), two abutting surfaces (F ₁ ) and (F ₂ ) that abut on the abutting piece (24) separately are formed on the abutting piece (25) and the operation pedal (14 ), The hydraulic brake (B) is braked and released, and the return spring (15) stretched between the operation pedal (14) and the support frame (22). When the operation pedal (14) is returned by the return force of (1), the hydraulic brake (B) is forcibly returned to the non-braking operation state by being interlocked by the interlocking device (18).

The play between the contacting surfaces of the contacting piece (24) and the contacted piece (25) is about 10.8 ° in the rotating direction, as shown in FIG.

In the figure, (26) is a contact plate portion (27) attached to the lever member (17A).
Is a stopper that contacts with and regulates the return position of the operation pedal (14), and is attached to the support frame (22).

[Another embodiment]

The shapes of the abutting piece (24) and the abutting piece (25) may be variously changed, and the play angle between them is not limited to 10.8 °.

The present invention can be applied not only to the shovel loader but also to other work vehicles.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of an operating portion of a clutch brake of a work vehicle according to the present invention. FIG. 1 is an enlarged side view of an essential part, FIG. 2 is an exploded perspective view of an essential part, and FIG. Is a side view of a main part, and FIG. 4 is a side view of the entire shovel loader. (14) …… Operating pedal, (17) …… Operating system, (18) …… Interlocking device, (20) …… First pivot boss, (21) …… Second pivot boss, (24 ) …… Abutment piece, (25) …… Abutting piece, (HST) …… Stepless transmission, (CV) …… Control valve, (B) …… Hydraulic brake, (Q) …… Axis core , (F ₁ ), (F ₂ ) …… For the time being.

Claims (1)

[Scope of utility model registration request] 1. An operating system for a traveling hydraulic brake (B) by interlocking an operation pedal (14) swingable back and forth with a clutch operating control valve (CV) of a hydraulic traveling continuously variable transmission (HST). (17), the interlocking device (1
8) is an operation part of a clutch brake of a work vehicle provided with the operation pedal to form the interlocking device (18).
The first pivot support boss (20) of (14) and the second pivot support boss (21) provided in the operation system (17) are arranged on the same axis (Q) and contact each other. A contact piece (24) and a contacted piece (25) are separately provided on the first and second pivot bosses (20) and (21), respectively, and the contact piece (around the axis (Q) ( The contact piece (24) in the reciprocating rotation direction of (24)
An operating part of a clutch / brake of a work vehicle, in which two abutting surfaces (F ₁ ) and (F ₂ ) abutting on each other are formed on the abutting piece (25).