US-12618220-B2 - Operation device of skid-steer loader, and skid-steer loader

US12618220B2US 12618220 B2US12618220 B2US 12618220B2US-12618220-B2

Abstract

The present invention relates to construction machinery, and relates in particular to an operation device of a skid-steer loader, and a skid-steer loader. The operation device of a skid-steer loader can be disposed on a frame structure ( 3 ) of the skid-steer loader, and is located on a side of an operator cab ( 5 ) of the skid-steer loader. The operation device comprises a lift arm ( 16 ) comprising a clearance section ( 10 ). When the lift arm ( 16 ) is in a traveling position, the clearance section ( 10 ) is located in a region of the lift arm ( 16 ) adjacent to a side window of the operator cab. A top portion of the clearance section ( 10 ) is recessed toward a bottom portion of the frame structure ( 3 ) of the skid-steer loader. The operation device of the skid-steer loader can reduce the area on the side of the operator cab blocked by the lift arm, thereby increasing the peripheral vision of a driver.

Inventors

Xiong Tang
Qianyou KUANG
Guorui Qu
Bin BIAN
Qian Li

Assignees

ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY CO., LTD.
ZOOMLION SHAANXI WESTERN EARTHMOVING MACHINERY CO., LTD
ZOOMLION EARTHMOVING MACHINERY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20201217
Priority Date: 20201020

Claims (11)

1 . An operation device of a skid-steer loader, which can be arranged on a frame structure of the skid-steer loader and located at sides of an operator cab of the skid-steer loader, comprising: a lift arm having a clearance section, a first section, and a second section, and the first section, the clearance section, and the second section are arranged sequentially in a length direction of the lift arm, wherein when the lift arm is in a traveling position, the clearance section is located in a region of the lift arm adjacent to a side window of the operator cab, and a top portion of the clearance section is recessed toward a bottom portion of the frame structure of the skid-steer loader, wherein when the lift arm is in the traveling position, with a reference length set to 1 and an index point of a driver's seat in the operator cab denoted as point G, a horizontal distance L 1 between a rear end point K of the first section and the point G satisfies 0.8≤L 1 ≤1.2, and a vertical distance L 2 between the point K and the point G satisfies 0.611≤L 2 ≤0.916; a horizontal distance L 3 between a rear end point B of the clearance section and the point G satisfies 0.472≤L 3 ≤0.709, and a vertical distance L 4 between the point B and the point G satisfies 0.374≤L 4 ≤0.562; and a horizontal distance L 5 between the point G and a front end point C of the clearance section satisfies 0.146≤L 5 ≤0.219, and a vertical distance L 6 between the point G and the point C satisfies 0.09≤L 6 ≤0.136.
2 . The operation device of a skid-steer loader of claim 1 , wherein a top surface of the clearance section is an arc-shaped surface; and/or a top surface of the first section is a flat surface.
3 . The operation device of a skid-steer loader of claim 1 , wherein a top surface of the first section is a concave surface; and/or a top surface of the first section and a top surface of the clearance section are configured to be arc-shaped concave surfaces integrally.
4 . The operation device of a skid-steer loader of claim 1 , wherein the rear end of the clearance section extends to the rear end of the operator cab, and the front end of the clearance section extends to a front of the driver's seat, when the lift arm is in the traveling position.
5 . The operation device of a skid-steer loader of claim 1 , further comprises a driving mechanism operatively connected with the lift arm for switching the lift arm between the traveling position and a lifting position.
6 . The operation device of a skid-steer loader of claim 5 , wherein the driving mechanism comprises a lift cylinder, which has a cylinder tube fixedly arranged on the frame structure and a telescopic rod extending into a chamber of the corresponding lift arm and hinged to the lift arm.
7 . The operation device of a skid-steer loader of claim 6 , further comprises safety supporting members wrapped around the extended telescopic rod to prevent the telescopic rod from retracting inadequately when switching between the traveling position and the lifting position, and the lift arm has a mounting part for mounting a corresponding safety supporting member.
8 . The operation device of a skid-steer loader of claim 7 , wherein the mounting part comprises a mounting plate arranged on a middle part of the lift arm and a wedge plate arranged on a front part of the lift arm, the mounting plate has a first pin hole, each of the safety supporting members comprise a strip-shaped housing having a strip-shaped opening, and a connecting plate arranged on a first end of the strip-shaped housing, the first end has a socket for receiving the mounting plate, the connecting plate has a second pin hole corresponding to the first pin hole in the mounting plate inserted in the socket, the first end is connected to the mounting plate via a bolt inserted in the first pin hole and the second pin hole, and the wedge plate is configured to be wedged in an opening of a second end of the strip-shaped housing.
9 . The operation device of a skid-steer loader of claim 1 , wherein a front part and a rear part of the lift arm are provided with a hole for a hydraulic pipeline to pass through respectively, and the hydraulic pipeline passes through the chamber of a corresponding lift arm via the hole.
10 . The operation device of a skid-steer loader of claim 9 , wherein a pipe clamp seat for fixing the hydraulic pipeline is provided at the hole in the rear part of the lift arm, and/or a fixing plate for fixing a hydraulic joint is provided at the hole in the front part of the lift arm.
11 . A skid-steer loader, comprising: a frame structure; an operator cab arranged on the frame structure; and an operation device, arranged on the frame structure and located at sides of the operator cab, including a lift arm having a clearance section, a first section, and a second section, and the first section, the clearance section, and the second section are arranged sequentially in a length direction of the lift arm, wherein when the lift arm is in a traveling position, the clearance section is located in a region of the lift arm adjacent to a side window of the operator cab, and a top portion of the clearance section is recessed toward a bottom portion of the frame structure of the skid-steer loader, wherein when the lift arm is in the traveling position, with a reference length set to 1 and an index point of a driver's seat in the operator cab denoted as point G, a horizontal distance L 1 between a rear end point K of the first section and the point G satisfies 0.8≤L 1 ≤1.2, and a vertical distance L 2 between the point K and the point G satisfies 0.611≤L 2 ≤0.916, a horizontal distance L 3 between a rear end point B of the clearance section and the point G satisfies 0.472≤L 3 ≤0.709, and a vertical distance L 4 between the point B and the point G satisfies 0.374≤L 4 ≤0.562, and a horizontal distance L 5 between the point G and a front end point C of the clearance section satisfies 0.146≤L 5 ≤0.219, and a vertical distance L 6 between the point G and the point C satisfies 0.09≤L 6 ≤0.136.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a 35 USC § 371 National Stage application of International Patent Application No. PCT/CN2020/137127, which was filed Dec. 17, 2020, entitled “OPERATION DEVICE OF SKID-STEER LOADER, AND SKID-STEER LOADER” and claims priority to Chinese Patent Application No. 202011126549.7 filed on Oct. 20, 2020, which are incorporated herein by reference as if fully set forth. FIELD The present invention relates to construction machinery, in particular to an operation device of a skid-steer loader and a skid-steer loader. BACKGROUND A skid-steer loader is a small-size construction machine that is compact and highly maneuverable. The operation device of a skid-steer loader is the main load-bearing structural component of the skid-steer loader, and the structural form of the operation device determines the field of view of the driver, and has great influences on the unloading height and the unloading range of the skid-steer loader. The main body of each lift arm is generally a rectangular tube, and the section of the lift arm near the side window of the operator cab is configured into the form of an inclined linear section, where the lift arm is at a higher position, and blocks a large area of the side window, resulting in a poor lateral field of view of the driver. SUMMARY The object of the present invention is to provide an operation device of a skid-steer loader and a skid-steer loader. The operation device of a skid-steer loader can reduce the blocking of the lift arm to the side of the operator cab and improve the lateral field of view of the driver. To attain the above object, in a first aspect, the present invention provides an operation device of a skid-steer loader, which can be arranged on a frame structure of the skid-steer loader and is located at sides of a operator cab of the skid-steer loader, wherein the operation device comprises a lift arm comprising an clearance section, and when the lift arm is in a traveling position, the clearance section is located in a region of the lift arm adjacent to a side window of the operator cab, and a top portion of the clearance section is recessed toward a bottom portion of the frame structure of the skid-steer loader. Preferably, the lift arm further comprises a first section and a second section, wherein the first section, the clearance section and the second section are arranged sequentially in a length direction of the lift arm. Preferably, the top surface of the clearance section is an arc-shaped surface; and/or the top surface of the first section is a flat surface. Preferably, the rear end of the clearance section extends to the rear end of the operator cab, and the front end of the clearance section extends to the front part of a driver's seat in the operator cab, when the lift arm is in the traveling position. Preferably, when the lift arm is in the traveling position, with a reference length set to 1 and an index point of the driver's seat denoted as point G, the horizontal distance L1 between a rear end point K of the first section and the point G satisfies 0.8≤L1≤1.2, and the vertical distance L2 between the point K and the point G satisfies 0.611≤L2≤0.916; the horizontal distance L3 between a rear end point B of the clearance section and the point G satisfies 0.472≤L3≤0.709, and the vertical distance L4 between the point B and the point G satisfies 0.374≤L4≤0.562; and the horizontal distance L5 between the point G and a front end point C of the clearance section satisfies 0.146≤L5≤0.219, and the vertical distance L6 between the point G and the point C satisfies 0.09≤L6≤0.136. Preferably, the operation device comprises driving mechanisms configured to drive the lift arm to switch between a traveling position and a lifting position. Preferably, the driving mechanism comprises a lift cylinder which has a cylinder tube fixedly arranged on the frame structure and a telescopic rod extending into a chamber of the corresponding lift arm and hinged to the lift arm. Preferably, the operation device comprises safety supporting members for wrapping around the extended telescopic rods to prevent the telescopic rod from retracting in an abnormal state, and the lift arm has a mounting part for mounting a corresponding safety supporting member. Preferably, the mounting part comprises a mounting plate arranged on the middle part of the lift arm and a wedge plate arranged on the front part of the lift arm, the mounting plate has a first pin hole, the safety supporting member comprises a strip-shaped housing having a strip-shaped opening, and a connecting plate arranged on a first end of the strip-shaped housing, the first end has a socket for receiving the mounting plate, the connecting plate has a second pin hole corresponding to the first pin hole in the mounting plate inserted in the socket, the first end is connected to the mounting plate via a bolt inserted in the first pin hole and the second pin hole, and the wedg