A crab-walking four-bar linkage mechanism, device and road roller

Abstract

This invention provides a crab-moving four-bar linkage mechanism, device, and road roller. The crab-moving four-bar linkage mechanism connects the front and rear frames, comprising a stepped connecting rod, an arc-shaped connecting rod, and crab-moving shafts. Two crab-moving shafts are rotatably connected to the rear frame and are distributed on both sides of the rear frame. The two crab-moving shafts are connected to the ends of the arc-shaped connecting rods via the stepped connecting rods. The arc-shaped portion of the arc-shaped connecting rod is located between the two crab-moving shafts. The invention also includes crab-moving cylinders, which drive the arc-shaped connecting rods to move left and right relative to the rear frame, thereby causing the front frame to move left and right, forming a crab-moving motion between the front and rear frames. The two ends of the arc-shaped connecting rods are connected to the front frame via steering cylinders, which drive the front frame to steer. The invention also includes a steering shaft, a sway shaft, and a sway frame. The structural optimization of the road roller's articulated crab-moving mechanism significantly shortens the overall length of the mechanism and avoids interference with the steering angle during crab-moving, achieving a complete steering angle in crab-moving mode.

Description

Technical Field

[0001] This invention patent relates to the field of road rollers, and more particularly to a crab-walking four-bar linkage mechanism, device, and road roller. Background Technology

[0002] The crab-moving mechanism is the main component that enables the crab-moving function of a double-drum roller. It's a crucial function of the roller, ensuring that at least one drum deviates a certain distance from the centerline of the frame during operation. This allows the roller to easily approach structures for compaction and easily move away from them without interference. This ability to approach structures for compaction is commonly referred to as edge-keeping capability.

[0003] Cracking mechanisms typically consist of two steering shafts. The shaft closer to the center of the chassis is used for steering. When the roller is in a steering state, the shaft farther from the center of the chassis turns in the opposite direction, allowing the roller to enter a crabging state. At the same steering angle, the greater the distance between the two steering shafts, the greater the crabging distance; conversely, the closer the two steering shafts are, the smaller the crabging distance. In crabging mode, the roller's steering angle in the crabging direction decreases, representing the difference between the steering angle in the non-cracking state and the crabging angle. Therefore, to avoid interference from crabging on steering, the distance between the two steering shafts is generally quite large. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a crab-walking four-bar linkage mechanism, device and road roller. The purpose is to shorten the length of the entire crab-walking mechanism, avoid the interference of crab-walking on the steering angle during the crab-walking process, and still achieve the complete steering angle, so that the road roller can operate more safely.

[0005] To address the problems of existing technologies, this invention discloses a crab-walking four-bar linkage mechanism for connecting a front frame and a rear frame. The mechanism comprises: a stepped link, an arc-shaped link, and crab-walking shafts. Two crab-walking shafts are rotatably connected to the rear frame and are distributed on both sides of the rear frame. The two crab-walking shafts are respectively connected to the ends of the arc-shaped links via the stepped link. The stepped link and the arc-shaped link are rotatably connected via a pivot. The arc-shaped portion of the arc-shaped link is located between the two crab-walking shafts. Both ends of the arc-shaped link are used to connect to the front frame via a steering drive device.

[0006] Furthermore, the two ends of the stepped connecting rod are provided with a height difference, with the higher end connected to the crab-walking shaft and the lower end connected to the bow-shaped connecting rod.

[0007] Accordingly, a crab-moving device includes a crab-moving hydraulic cylinder and the aforementioned crab-moving four-bar linkage mechanism. One end of the crab-moving hydraulic cylinder is connected to the rear frame, and the other end is connected to an arc-shaped connecting rod. The crab-moving hydraulic cylinder is used to drive the arc-shaped connecting rod to move left and right relative to the rear frame, thereby driving the front frame to move left and right to form a crab-moving motion between the front frame and the rear frame.

[0008] Furthermore, the crab-moving hydraulic cylinder is connected to the middle of the bow-shaped connecting rod.

[0009] Furthermore, both ends of the bow-shaped connecting rod are connected to the front frame via steering cylinders, which are used to drive the front frame to steer.

[0010] Furthermore, it also includes a steering shaft, a sway shaft, and a sway frame. The steering shaft is rotatably connected to the bow-shaped connecting rod, the steering shaft is connected to the sway frame via the sway shaft, and the sway frame is connected to the front frame.

[0011] Furthermore, the steering shaft is located in the middle of the bow-shaped connecting rod.

[0012] Accordingly, a road roller includes the aforementioned crab-moving device.

[0013] The beneficial effects of this invention are as follows:

[0014] By optimizing the structure of the road roller's articulated crab-walking mechanism through a four-bar linkage, the length of the entire crab-walking mechanism is significantly shortened, and the interference of crab-walking on the steering angle during crab-walking is avoided, thus achieving a complete steering angle in crab-walking mode. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the leftward crab-moving state structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the crab-like crawling structure of the present invention;

[0018] Figure 4 This is a schematic diagram illustrating the principle of the present invention;

[0019] Figure 5 This is a schematic diagram comparing the leftward and rightward crab-movement methods of the present invention.

[0020] Figure label:

[0021] 1. Rear frame; 2. Front frame; 3. Stepped link; 4. Bow-shaped link; 5. Steering shaft; 6. Swing shaft; 7. Swing frame; 8. Crab-like hydraulic cylinder; 9. Steering cylinder; 10. Crab-like shaft. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, the present invention discloses a crab-walking four-bar linkage mechanism for connecting a front frame 2 and a rear frame 1. The mechanism includes: a stepped link 3, an arc-shaped link 4, and crab-walking shafts 10. Two crab-walking shafts 10 are rotatably connected to the rear frame 1 and are distributed on both sides of the rear frame 1. The two crab-walking shafts 10 are respectively connected to the ends of the arc-shaped link 4 via the stepped link 3. The stepped link 3 and the arc-shaped link 4 are rotatably connected via a pivot. The arc-shaped portion of the arc-shaped link 4 is located between the two crab-walking shafts 10. The arc-shaped design of the bow-shaped link 4 allows most of its structure to be located in the rear frame 1, effectively shortening the length of the crab-like mechanism. The rear frame 1, the bow-shaped link 4, and the two stepped links 3 constitute a four-bar linkage. Utilizing the principle of the four-bar linkage, the bow-shaped link 4 can move left and right relative to the rear frame 1. At the same time, the two ends of the bow-shaped link 4 are used to connect to the front frame 2 through the steering drive device. The bow-shaped link 4 drives the front frame 2 to complete the crab-like movement of the front frame 2 and the rear frame 1 without interfering with the steering device.

[0024] The stepped connecting rod 3 has a height difference at both ends. The higher end is connected to the crab shaft 10, and the lower end is connected to the bow-shaped connecting rod 4. This is used to reduce the height of the bow-shaped connecting rod 4 so that the bow-shaped connecting rod 4 can be retracted into the frame structure of the rear frame 1 in the crab-moving state. This also serves to shorten the length of the articulated crab-moving mechanism.

[0025] like Figure 4-5 As shown, the crab-moving device using the above-mentioned four-bar linkage includes a crab-moving cylinder 8. One end of the crab-moving cylinder 8 is connected to the rear frame 1, and the other end is connected to the bow-shaped connecting rod 4. The crab-moving cylinder 8 is used to drive the bow-shaped connecting rod 4 to move left and right relative to the rear frame 1, thereby driving the front frame 2 to move left and right, forming a crab-moving motion between the front frame 2 and the rear frame 1. Preferably, the crab-moving cylinder 8 is connected to the middle of the bow-shaped connecting rod 4. The extension and retraction of the crab-moving cylinder 8 can drive the four-bar linkage to translate to the left or right, realizing the crab-moving motion.

[0026] Both ends of the bow-shaped connecting rod 4 are connected to the front frame 2 via steering cylinders 9. The steering cylinders 9 are used to drive the front frame 2 to steer. During the crabbing process, the steering cylinders 9 do not participate in the operation. The steering cylinders 9 only undergo relative displacement with one bow-shaped connecting rod 4 during the steering process. Steering and crabbing are two independent mechanisms.

[0027] The steering mechanism also includes a steering shaft 5, a rocker shaft 6, and a rocker frame 7. The steering shaft 5 is rotatably connected to the bow-shaped connecting rod 4. The steering shaft 5 is connected to the rocker frame 7 via the rocker shaft 6. The rocker frame 7 is connected to the front frame 2. Preferably, the steering shaft 5 is located in the middle of the bow-shaped connecting rod 4. Due to the presence of the bow-shaped connecting rod 4, the steering shaft 5 is moved closer to the rear frame 1 to shorten the length of the articulated crabbing mechanism. During steering, the steering cylinders 9 at both ends of the bow-shaped connecting rod 4 cooperate with each other, and the front frame 2 rotates around the steering shaft 5 via the rocker frame 7 and the rocker shaft 6. Steering and crabbing do not affect each other.

[0028] The road roller using the above-mentioned crab-moving device avoids the interference of crab-moving on the steering angle during the crab-moving process, and can achieve a complete steering angle in the crab-moving state.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the accompanying drawings of this invention, the fill patterns are only for distinguishing layers and do not constitute any other limitation.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crab-walking four-bar linkage, wherein the crab-walking four-bar linkage is used to connect the front frame (2) and the rear frame (1), characterized in that, include: The vehicle has a stepped connecting rod (3), an arc-shaped connecting rod (4), and a crab-like shaft (10). The crab-like shaft (10) is rotatably connected to the rear frame (1). There are two crab-like shafts distributed on both sides of the rear frame (1). The two crab-like shafts (10) are connected to the ends of the arc-shaped connecting rod (4) through the stepped connecting rod (3). The stepped connecting rod (3) and the arc-shaped connecting rod (4) are rotatably connected through a rotating shaft. The arc-shaped part of the arc-shaped connecting rod (4) is located between the two crab-like shafts (10). The two ends of the arc-shaped connecting rod (4) are used to connect to the front frame (2) through the steering drive device. The stepped connecting rod (3) has a height difference at both ends, with the higher end connected to the crab shaft (10) and the lower end connected to the bow-shaped connecting rod (4).

2. A crab-walking device, comprising a crab-walking oil cylinder (8), characterized in that, It also includes the crab-walking four-bar linkage mechanism as described in claim 1, wherein one end of the crab-walking cylinder (8) is connected to the rear frame (1) and the other end is connected to the bow-shaped connecting rod (4). The crab-walking cylinder (8) is used to drive the bow-shaped connecting rod (4) to move left and right relative to the rear frame (1), thereby driving the front frame (2) to move left and right to form the crab-walking movement of the front frame (2) and the rear frame (1).

3. The crab-walking device according to claim 2, characterized in that, The crab-walking oil cylinder (8) is connected to the middle of the bow-shaped connecting rod (4).

4. The crab-walking device according to claim 2, characterized in that, The two ends of the bow-shaped connecting rod (4) are connected to the front frame (2) through the steering cylinder (9), and the steering cylinder (9) is used to drive the front frame (2) to steer.

5. The crab-walking device according to claim 2, characterized in that, It also includes a steering shaft (5), a rocker shaft (6) and a rocker frame (7). The steering shaft (5) is rotatably connected to the bow-shaped connecting rod (4). The steering shaft (5) is connected to the rocker frame (7) through the rocker shaft (6). The rocker frame (7) is connected to the front frame (2).

6. The crab-walking device according to claim 5, characterized in that, The steering shaft (5) is located in the middle of the bow-shaped connecting rod (4).

7. A road roller, characterized in that, The road roller is mounted on the crab-walking device as described in any one of claims 2-6.

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