Steering structure and land leveler

Abstract

The utility model belongs to the technical field of land levelers, and discloses a steering structure and a land leveler. The steering structure comprises a bridge frame, two steering knuckles, a double-acting oil cylinder and a sliding connection assembly. The two steering knuckles are rotationally arranged at the two ends of the bridge frame in the first direction; the double-acting oil cylinder comprises a piston rod and an oil cylinder body arranged on the piston rod in a sliding mode, and the piston rod is fixedly arranged on the bridge frame and extends in the first direction. The sliding connection assembly comprises a sliding connection body and two steering pull rods, the sliding connection body is fixedly connected with the oil cylinder body, meanwhile, the sliding connection body is in sliding connection with the bridge frame in the first direction, and the two ends of the sliding connection body in the first direction are hinged to one ends of the two steering pull rods correspondingly; the ends, away from the sliding connecting body, of the two steering pull rods are hinged to the two steering knuckles correspondingly. According to the steering structure, the sliding connector can limit the oil cylinder body to rotate around the axis of the piston rod, abrasion of the double-acting oil cylinder is reduced, and the service life of the double-acting oil cylinder is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of grader technology, and in particular to a steering structure and a grader. Background Technology

[0002] The steering mechanism of a grader typically consists of two single-acting cylinders that drive two steering knuckles to rotate, enabling left and right steering. The two single-acting cylinders are usually symmetrically distributed, and strict tolerance control is required during assembly; otherwise, the rotation angles of the two steering knuckles will not be coordinated.

[0003] To address the aforementioned issues, some existing technologies have proposed using a double-acting hydraulic cylinder to drive a steering tie rod to move left and right. Specifically, the piston rod of the double-acting cylinder is fixedly connected to the bridge frame, and the cylinder body reciprocates left and right, driving the steering tie rod to move left and right, thus enabling the steering tie rod to drive the two steering knuckles to turn left and right. However, this structure features a ball joint pin in the cylinder body and a ball joint connector in the middle of the steering tie rod, with the ball joint pin hinged to the connector. When the cylinder body slides left and right, it needs to slide and rotate simultaneously relative to the piston rod, resulting in significant wear on the double-acting cylinder and reduced service life. Furthermore, the ball joint pin and connector require high machining precision, leading to increased overall costs. Utility Model Content

[0004] The purpose of this invention is to provide a steering structure and grader that can improve the service life of the double-acting hydraulic cylinder and reduce the overall structural cost.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Steering structure, including:

[0007] Cable tray;

[0008] Two steering knuckles are rotatably mounted at both ends of the cable tray in a first direction;

[0009] A double-acting hydraulic cylinder includes a piston rod and a cylinder body slidably disposed on the piston rod. The piston rod is fixedly disposed on the bridge frame and extends along the first direction.

[0010] A sliding connection assembly includes a sliding connector and two steering tie rods. The sliding connector is fixedly connected to the cylinder body and simultaneously slidably connected to the bridge frame along the first direction. Both ends of the sliding connector along the first direction are respectively hinged to one end of the two steering tie rods, and the ends of the two steering tie rods away from the sliding connector are respectively hinged to the two steering knuckles.

[0011] As an alternative, the cable tray is provided with a groove extending along the first direction;

[0012] The sliding connector includes a sliding connecting plate and a sliding plate disposed on the side of the sliding connecting plate facing the bridge frame. The sliding connecting plate is fixedly connected to the cylinder body, and the sliding plate is slidably disposed in the slide groove.

[0013] As an alternative, the chute is composed of two elongated plates spaced apart along a second direction on the cable tray;

[0014] The first direction and the second direction are perpendicular to each other.

[0015] As an optional solution, the sliding connector further includes two first pins disposed on the side of the sliding connector plate opposite to the cable tray and spaced apart along the first direction;

[0016] Each of the aforementioned steering knuckles is provided with a second pin;

[0017] Each of the steering tie rods is provided with a spherical bearing at both ends, which is respectively hinged to the corresponding first pin and second pin.

[0018] As an optional feature, the sliding connection assembly further includes a first fastener;

[0019] The cylinder body is provided with a fixing plate, the fixing plate is provided with a first connecting hole, and the sliding connecting plate is provided with a second connecting hole corresponding to the first connecting hole. The first fastener is used to pass through the corresponding first connecting hole and second connecting hole to fix the fixing plate and the sliding connecting plate.

[0020] As an optional solution, the fixed plate is provided with a plurality of first connecting holes, and the sliding connecting plate is provided with a plurality of second connecting holes that correspond one-to-one with the first connecting holes, and a first fastener is inserted into each group corresponding to the first connecting holes and the second connecting holes.

[0021] As an alternative, both the slide plate and the first pin are welded to the sliding connecting plate.

[0022] As an alternative, the cable tray is provided with two fixed ears that are spaced apart along the first direction, the piston rod is clamped between the two fixed ears, and both ends of the piston rod are fixedly connected to the two fixed ears respectively.

[0023] As an alternative, the steering structure further includes two second fasteners, each corresponding to one of the two fixing lugs;

[0024] The fixing lug is provided with a third connecting hole, and both ends of the piston rod are provided with a fourth connecting hole corresponding to the two third connecting holes respectively. The second fastener is used to pass through the corresponding third connecting hole and the fourth connecting hole so that the piston rod is fixedly connected to the fixing lug.

[0025] A grader includes a frame, two wheel hubs, and a steering structure as described in any of the above embodiments. The bridge is fixedly connected to the frame, and the two wheel hubs are respectively mounted on the two steering knuckles.

[0026] The beneficial effects of this utility model are:

[0027] The steering structure provided by this utility model allows the cylinder body to slide along the first direction while simultaneously driving the sliding connecting body to slide along the first direction. Since the sliding connecting body can only slide along the first direction and is fixedly connected to the cylinder body, it can restrict the cylinder body from rotating around the piston rod axis, reducing the wear of the double-acting cylinder and improving its service life. Furthermore, the two steering tie rods are respectively hinged to both ends of the sliding connecting body, and the ends of the two steering tie rods away from the sliding connecting body are respectively hinged to the steering knuckles. This enables the two steering knuckles to be driven to rotate by the two steering tie rods when the sliding connecting body slides. Compared with the existing technology that uses a single steering tie rod in conjunction with a ball joint pin, this effectively reduces the processing difficulty and cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the steering structure provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the cable tray structure involved in the embodiment of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the sliding connector involved in the embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the double-acting hydraulic cylinder involved in the embodiment of this utility model.

[0032] In the picture:

[0033] 1. Cable tray; 11. Slide groove; 111. Long strip; 12. Fixing lug; 121. Third connecting hole;

[0034] 2. Steering knuckle;

[0035] 3. Double-acting hydraulic cylinder; 31. Piston rod; 311. Fourth connecting hole; 32. Cylinder body; 321. Fixing plate; 3211. First connecting hole;

[0036] 4. Sliding connection assembly; 41. Sliding connector; 411. Sliding connecting plate; 4111. Second connecting hole; 412. Slide plate; 413. First pin; 42. Steering tie rod; 421. Spherical bearing; 43. First fastener;

[0037] 5. Tilt joint;

[0038] 6. Inclined tie rod;

[0039] 7. Wheel hub. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] like Figures 1-4 As shown, this utility model embodiment provides a steering structure, which includes a bridge 1, two steering knuckles 2, a double-acting hydraulic cylinder 3, and a sliding connection assembly 4.

[0045] Two steering knuckles 2 are rotatably mounted at both ends of the bridge frame 1 along a first direction; the double-acting cylinder 3 includes a piston rod 31 and a cylinder body 32 slidably mounted on the piston rod 31. The piston rod 31 is fixedly mounted on the bridge frame 1 and extends along the first direction (i.e., the axis of the piston rod 31 is parallel to the first direction); the sliding connection assembly 4 includes a sliding connector 41 and two steering tie rods 42. The sliding connector 41 is fixedly connected to the cylinder body 32, and the sliding connector 41 is slidably connected to the bridge frame 1 along the first direction. The two ends of the sliding connector 41 along the first direction are respectively hinged to one end of the two steering tie rods 42, and the ends of the two steering tie rods 42 away from the sliding connector 41 are respectively hinged to the two steering knuckles 2.

[0046] When the cylinder body 32 slides along the first direction, it can simultaneously drive the sliding connecting body 41 to slide along the first direction. Since the sliding connecting body 41 can only slide along the first direction and is fixedly connected to the cylinder body 32, the sliding connecting body 41 can restrict the cylinder body 32 from rotating around the axis of the piston rod 31, reducing the wear of the double-acting cylinder 3 and improving the service life of the double-acting cylinder 3. In addition, the two steering tie rods 42 are respectively hinged to both ends of the sliding connecting body 41, and the ends of the two steering tie rods 42 away from the sliding connecting body 41 are respectively hinged to the steering knuckle 2. This realizes that when the sliding connecting body 41 slides, the two steering knuckles 2 can be driven to rotate by the two steering tie rods 42 respectively. Compared with the structure of using one steering tie rod 42 and a ball joint in the prior art, the processing difficulty and cost are effectively reduced.

[0047] In this embodiment, the bridge frame 1 is provided with tilting joints 5 at both ends along the first direction, and two steering knuckles 2 are respectively installed on the two tilting joints 5 to realize the rotatable connection between the steering knuckles 2 and the bridge frame 1. The two tilting joints 5 are connected by tilting tie rods 6. When the grader encounters a pile of soil or a side slope, the front axle tilts, and the tilting tie rods 6 can keep the front wheels perpendicular to the ground, which can increase the adhesion of the front wheels, prevent slippage, and ensure the safe and stable operation of the grader.

[0048] Optionally, such as Figures 2-3 As shown, the cable tray 1 has a sliding groove 11 extending in a first direction on the side facing the sliding connector 41. The sliding connector 41 includes a sliding connecting plate 411 and a sliding plate 412 disposed on the side of the sliding connecting plate 411 facing the cable tray 1. The sliding connecting plate 411 is fixedly connected to the cylinder body 32, and the sliding plate 412 is slidably disposed in the sliding groove 11. This structure, by sliding the sliding plate 412 into the sliding groove 11, allows the sliding connector 41 to slide back and forth only in the first direction, and the sliding connecting plate 411 and the cylinder body 32 are fixedly connected, thereby restricting the rotation of the cylinder body 32 by the sliding connector 41.

[0049] Specifically, the cable tray 1 has two long strips 111 spaced apart along a second direction on the side facing the sliding connector 41. The long strips 111 extend along a first direction, and the two long strips 111 form a groove 11. By using two strips on the cable tray 1 to form a groove 11, the groove is avoided from being dug on the cable tray 1, which can effectively improve the strength of the cable tray 1.

[0050] The first direction and the second direction are perpendicular to each other.

[0051] Optionally, the sliding connector 41 further includes two first pins 413 disposed on the side of the sliding connector 411 away from the bridge frame 1 and spaced apart along the first direction; each steering knuckle 2 is provided with a second pin; each steering tie rod 42 is provided with a spherical bearing 421 at both ends, the first pins 413 at both ends of the sliding connector 411 are respectively hinged to the spherical bearings 421 at one end of the two steering tie rods 42, and the spherical bearings 421 at the end of the two steering tie rods 42 away from the sliding connector 41 are respectively hinged to the second pins of the two steering knuckles 2. By providing spherical bearings 421 on the steering tie rods 42, the connection of the steering tie rods 42 is simplified, and flexible steering can be achieved.

[0052] Optionally, the sliding connector 41 is a welded assembly. By welding both the slide plate 412 and the first pin 413 to the sliding connecting plate 411, the structure of the sliding connector 41 becomes more stable and stronger.

[0053] like Figure 1 and combined Figures 3-4 As shown, the sliding connection assembly 4 also includes a first fastener 43; the cylinder body 32 is provided with a fixing plate 321, the fixing plate 321 is provided with a first connecting hole 3211, and the sliding connection plate 411 is provided with a second connecting hole 4111 corresponding to the first connecting hole 3211. The first fastener 43 is used to pass through the corresponding first connecting hole 3211 and second connecting hole 4111 to fix the fixing plate 321 and the sliding connection plate 411, thereby realizing the fixed connection between the cylinder body 32 and the sliding connection body 41.

[0054] To improve the connection strength between the fixed plate 321 and the sliding connecting plate 411, the fixed plate 321 may optionally be provided with a plurality of first connecting holes 3211, which are distributed in a 2x5 matrix. The sliding connecting plate 411 is provided with a plurality of second connecting holes 4111 that correspond one-to-one with the first connecting holes 3211. Each group of corresponding first connecting holes 3211 and second connecting holes 4111 is provided with a first fastener 43 to achieve a fixed connection between the fixed plate 321 and the sliding connecting plate 411.

[0055] In this embodiment, the first fastener 43 includes a bolt and a nut. The first connecting hole 3211 and the second connecting hole 4111 are both through holes. The bolt passes through the correspondingly distributed first connecting hole 3211 and second connecting hole 4111, and then the nut is screwed onto the bolt to clamp the fixing plate 321 and the sliding connecting plate 411.

[0056] Optionally, refer to Figures 1-2 As shown, the cable tray 1 is provided with two fixed ears 12 spaced apart along the first direction. The piston rod 31 is clamped between the two fixed ears 12, and both ends of the piston rod 31 are connected to the two fixed ears 12 respectively. By providing two spaced fixed ears 12, the double-acting hydraulic cylinder 3 can be installed on the cable tray 1, which is simple in structure and convenient in connection.

[0057] Furthermore, the steering structure also includes two second fasteners corresponding to the two fixed ears 12 respectively; the fixed ears 12 are provided with third connecting holes 121, and both ends of the piston rod 31 are provided with fourth connecting holes 311 corresponding to the two third connecting holes 121 respectively. When the piston rod 31 is sandwiched between the two fixed ears 12, the fourth connecting holes 311 at both ends of the piston rod 31 correspond one-to-one with the third connecting holes 121 on the two fixed ears 12 respectively. The second fasteners are used to pass through the corresponding third connecting holes 121 and fourth connecting holes 311 so that the piston rod 31 is fixedly connected to the fixed ears 12.

[0058] In this embodiment, the second fastener is a screw; the third connecting hole 121 is a through hole, and the fourth connecting hole 311 is a threaded hole. The second fastener passes through the third connecting hole 121 and is screwed into the fourth connecting hole 311 to achieve a fixed connection between the piston rod 31 and the fixing lug 12.

[0059] In other embodiments, welding may also be used between the piston rod 31 and the retaining lug 12.

[0060] This utility model embodiment also provides a grader, including a frame, two wheel hubs 7 and the aforementioned steering structure. The bridge frame 1 is fixedly connected to the frame, and the two wheel hubs 7 are respectively mounted on two steering knuckles 2. When the double-acting hydraulic cylinder 3 drives the two steering knuckles 2 to rotate, the two steering knuckles 2 respectively drive the two wheel hubs 7 to rotate, so as to realize the grader's left and right steering.

[0061] By setting the steering structure described above, the hydraulic cylinder 32 is fixedly connected to the sliding connector 41, and the sliding connector 41 is slidably connected to the slide groove 11 through the slide plate 412, so that the sliding connector 41 can only move in the first direction, which restricts the rotation of the hydraulic cylinder 32 and ensures that the hydraulic cylinder 32 only makes linear reciprocating motion in the first direction; then, the two steering knuckles 2 are connected to the sliding connector 41 by two steering tie rods 42 respectively, so that when the hydraulic cylinder 32 makes linear reciprocating motion, it can push the two steering knuckles 2 to rotate through the sliding connector 41, thereby realizing the steering of the grader.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A steering structure, characterized in that, include: Cable tray (1); Two steering knuckles (2) are rotatably mounted at both ends of the bridge frame (1) in a first direction; A double-acting hydraulic cylinder (3) includes a piston rod (31) and a cylinder body (32) slidably disposed on the piston rod (31). The piston rod (31) is fixedly disposed on the bridge frame (1) and the piston rod (31) extends along the first direction. The sliding connection assembly (4) includes a sliding connection body (41) and two steering tie rods (42). The sliding connection body (41) is fixedly connected to the cylinder body (32), and at the same time, the sliding connection body (41) is slidably connected to the bridge frame (1) along the first direction. The two ends of the sliding connection body (41) along the first direction are respectively hinged to one end of the two steering tie rods (42), and the ends of the two steering tie rods (42) away from the sliding connection body (41) are respectively hinged to the two steering knuckles (2).

2. The steering structure according to claim 1, characterized in that, The cable tray (1) is provided with a groove (11) extending along the first direction; The sliding connector (41) includes a sliding connecting plate (411) and a sliding plate (412) disposed on the side of the sliding connecting plate (411) facing the bridge (1). The sliding connecting plate (411) is fixedly connected to the cylinder body (32), and the sliding plate (412) is slidably disposed in the slide groove (11).

3. The steering structure according to claim 2, characterized in that, The chute (11) is composed of two long strips (111) that are spaced apart along the second direction and disposed on the bridge frame (1); The first direction and the second direction are perpendicular to each other.

4. The steering structure according to claim 2, characterized in that, The sliding connector (41) further includes two first pins (413) disposed on the side of the sliding connector (411) away from the cable tray (1) and spaced apart along the first direction; Each of the steering knuckles (2) is provided with a second pin; Each of the steering tie rods (42) is provided with a spherical bearing (421) at both ends, which is respectively hinged to the corresponding first pin (413) and second pin.

5. The steering structure according to claim 2, characterized in that, The sliding connection assembly (4) further includes a first fastener (43); The cylinder body (32) is provided with a fixing plate (321), the fixing plate (321) is provided with a first connecting hole (3211), the sliding connecting plate (411) is provided with a second connecting hole (4111) corresponding to the first connecting hole (3211), and the first fastener (43) is used to pass through the corresponding first connecting hole (3211) and second connecting hole (4111) to fix the fixing plate (321) and the sliding connecting plate (411).

6. The steering structure according to claim 5, characterized in that, The fixed plate (321) is provided with a plurality of first connecting holes (3211), and the sliding connecting plate (411) is provided with a plurality of second connecting holes (4111) that correspond one-to-one with the first connecting holes (3211). A first fastener (43) is inserted into each pair of the first connecting holes (3211) and the second connecting holes (4111).

7. The steering structure according to claim 4, characterized in that, The sliding plate (412) and the first pin (413) are both welded to the sliding connecting plate (411).

8. The steering structure according to claim 1, characterized in that, The cable tray (1) is provided with two fixed ears (12) spaced apart along the first direction. The piston rod (31) is sandwiched between the two fixed ears (12), and the two ends of the piston rod (31) are fixedly connected to the two fixed ears (12) respectively.

9. The steering structure according to claim 8, characterized in that, The steering structure also includes two second fasteners, each corresponding to one of the two fixing lugs (12); The fixing ear (12) is provided with a third connecting hole (121), and both ends of the piston rod (31) are provided with a fourth connecting hole (311) corresponding to the two third connecting holes (121). The second fastener is used to pass through the corresponding third connecting hole (121) and the fourth connecting hole (311) so that the piston rod (31) is fixedly connected to the fixing ear (12).

10. A grader, characterized in that, The vehicle includes a frame, two wheel hubs (7) and a steering structure as described in any one of claims 1-9, wherein the bridge (1) is fixedly connected to the frame and the two wheel hubs (7) are respectively mounted on the two steering knuckles (2).

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