Eccentric universal trundle with good steering performance

Abstract

The utility model discloses an eccentric universal caster with good steering performance, which comprises an eccentric rotating component, a bottom plate is rotatably mounted at the upper end of the eccentric rotating component, a support is rotatably mounted at the lower end of the eccentric rotating component, a roller is rotatably mounted on the inner side of the lower end of the support, and the eccentric rotating component comprises an eccentric shaft, an upper bearing outer ring and a lower bearing outer ring. The eccentric shaft comprises an upper shaft body and a lower shaft body, the lower end of the upper shaft body is eccentrically and fixedly arranged at the upper end of the lower shaft body, the peripheral side of the upper shaft body is sleeved with an upper bearing outer ring, and the peripheral side of the lower shaft body is sleeved with a lower bearing outer ring; a ball mounting cavity surrounding the peripheral side of the upper shaft body is arranged between the upper bearing outer ring and the upper shaft body, a ball mounting cavity surrounding the peripheral side of the lower shaft body is arranged between the lower bearing outer ring and the lower shaft body, and balls are filled in the ball mounting cavities. According to the eccentric universal trundle, the rotation flexibility and the load upper limit of the eccentric universal trundle are remarkably improved, the load reaches more than 2500kg, and the steering flexibility is not limited by a narrow space and a small turning radius position.

Description

Technical Field

[0001] The utility model relates to the technical field of casters, in particular to an eccentric universal caster with good steering performance. Background Art

[0002] AGV is the abbreviation of "Automated Guided Vehicle", which means "automatic guided transport vehicle", which is equipped with electromagnetic or optical automatic guidance devices, can travel along the specified guide path, and has safety protection and various transfer functions. With the widespread application of AGV carts, the universal casters (referred to as universal wheels) as auxiliary wheels have an increasingly greater impact on the accuracy of the AGV main body's running trajectory during the trajectory tracking process.

[0003] Most of the existing universal wheels use a combination of an ordinary eccentric rotating shaft and a bearing to achieve the steering of the universal caster. For example, Chinese utility model patent with application number 201821503920.5 discloses an auxiliary caster, including a caster bracket, a caster seat is arranged above the caster bracket, a caster shaft is arranged at the lower part of the caster bracket, a plurality of wheels are mounted on the caster shaft, an eccentric shaft is arranged between the caster seat and the caster bracket, one end of the eccentric shaft is rotatably connected to the caster seat, and the other end of the eccentric shaft is rotatably connected to the caster bracket. When this kind of universal caster is installed on a vehicle body or other structure for actual use, we find that when the vehicle body or other structure encounters obstacles in front and behind or when the vehicle body or other structure encounters a small turning radius, the caster of this structure is still difficult to achieve flexible steering, that is, the steering flexibility of the caster of this structure in a small space still has certain limitations; in addition, the eccentric casters of the above structure sold on the market are mostly assembled with standard eccentric bearings and eccentric shafts, and their loads in the axial direction are mostly less than 800kg, especially when the caster is assembled on the vehicle body and loaded with heavy goods, its steering flexibility will further decrease, and it is difficult to achieve a flexible 180° flip on the spot. For this reason, the utility model proposes an eccentric universal caster with good steering performance, in order to solve the above technical problems. Summary of the invention

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide an eccentric universal caster with good steering performance. The eccentric rotating component is designed as an integrated eccentric bearing component composed of an upper bearing component and a lower bearing component. Compared with the traditional eccentric bearing component assembled with an ordinary eccentric rotating shaft and a bearing, the rotation flexibility and load upper limit of the eccentric universal caster are significantly improved, and its load can reach more than 2500kg. When carrying heavy goods, it can still meet the flexible steering requirement of 180° in situ, and the steering flexibility is not limited by narrow spaces and small turning radius positions. The overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is to design an eccentric universal caster with good steering performance, including a base plate, an eccentric rotating component, a bracket, a roller and a wheel axle, wherein the base plate is rotatably installed on the upper end of the eccentric rotating component, the upper end of the bracket is rotatably installed on the lower end of the eccentric rotating component, and the roller is rotatably installed on the inner side of the lower end of the bracket through the wheel axle, the eccentric rotating component includes an eccentric shaft, an upper bearing outer ring and a lower bearing outer ring, the eccentric shaft includes an upper shaft body and a lower shaft body, the lower end of the upper shaft body is eccentrically fixed to the upper end of the lower shaft body, and the upper bearing outer ring sleeve The lower bearing outer ring is connected to the outer circumference of the upper shaft body, and the lower bearing outer ring is sleeved on the outer circumference of the lower shaft body. A ball installation cavity surrounding the outer circumference of the upper shaft body is provided between the inner side surface of the upper bearing outer ring and the outer side surface of the upper shaft body, and a ball installation cavity surrounding the outer circumference of the lower shaft body is provided between the inner side surface of the lower bearing outer ring and the outer side surface of the lower shaft body. The ball installation cavity is filled with balls. The upper bearing outer ring, the upper shaft body and the balls located in the ball installation cavity between the two constitute an upper bearing assembly, and the lower bearing outer ring, the lower shaft body and the balls located in the ball installation cavity between the two constitute a lower bearing assembly.

[0006] The utility model discloses an eccentric universal caster with good steering performance. The eccentric rotating component is designed as an integrated eccentric bearing component composed of an upper bearing component and a lower bearing component. Compared with the traditional eccentric bearing component assembled with an ordinary eccentric rotating shaft and a bearing, the rotation flexibility and load upper limit of the eccentric universal caster are significantly improved. The load can reach more than 2500kg, and when carrying heavy goods, it can still meet the flexible steering requirement of 180° in situ, and the steering flexibility is not limited by a narrow space and a small turning radius. The overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0007] The preferred technical solution is that the upper shaft body and the lower shaft body are integrally formed, thereby ensuring the overall structural strength of the eccentric shaft and the overall stability of the eccentric rotating assembly.

[0008] A further preferred technical solution is that the outer side surface of the upper shaft body and the outer side surface of the lower shaft body are respectively provided with an annular groove 1, the inner side surface of the upper bearing outer ring and the inner side surface of the lower bearing outer ring are respectively provided with an annular groove 2, and the annular groove 1 and the corresponding annular groove 2 are butt-jointed to form the ball installation cavity. The ball installation cavity is formed by butt-jointing the annular groove 1 and the corresponding annular groove 2, and the structural design is reasonable, ensuring that the eccentric universal caster with good steering performance of the utility model can be smoothly prepared and implemented.

[0009] A further preferred technical solution is that the outer peripheral wall of the upper bearing outer ring and the outer peripheral wall of the lower bearing outer ring are respectively provided with bead filling holes that are intersecting with the corresponding annular grooves, and the inner diameter of the bead filling hole is greater than the outer diameter of the ball, and the bead filling hole is sealed by an embedded plug. The bead filling hole improves the convenience of filling the ball into the ball installation cavity, which helps to improve the assembly and processing efficiency of the eccentric universal caster with good steering performance of the utility model.

[0010] A further preferred technical solution is that the inner wall of the bead filling hole is provided with a threaded structure, the plug is a hexagon socket screw, and the plug is screwed and fixed inside the bead filling hole. The installation or removal method of the plug inside the bead filling hole is simple, which further improves the assembly and processing efficiency of the eccentric universal caster with good steering performance of the utility model and the efficiency of later maintenance and replacement of balls.

[0011] A further preferred technical solution is that the upper bearing outer ring is provided with a plurality of threaded blind holes around the outer peripheral side of the corresponding annular groove 2 at intervals in the annular direction, the lower bearing outer ring is provided with a plurality of mounting holes 2 around the outer peripheral side of the corresponding annular groove 2 at intervals in the annular direction, the bottom plate is provided with a plurality of mounting holes 1 corresponding to the threaded blind holes on the upper bearing outer ring at intervals in the annular direction, the bottom plate is fixedly connected to the corresponding threaded blind holes on the upper bearing outer ring by screws 1 penetrating the inside of the mounting holes 1, the top plate located at the upper end of the bracket is provided with a plurality of threaded holes corresponding to the mounting holes 2 on the lower bearing outer ring at intervals in the annular direction, the lower bearing outer ring is fixedly connected to the corresponding threaded holes on the top plate by screws 2 penetrating the inside of the mounting holes 2. The fixing method of the bottom plate and the top plate at the upper end of the bracket at the upper and lower ends of the eccentric rotating assembly is simple, which further ensures that the eccentric universal caster with good steering performance of the utility model can be smoothly prepared and implemented.

[0012] A further preferred technical solution is that the bracket also includes side support plates fixedly arranged in parallel on the left and right side edges of the lower end surface of the top plate, a middle support plate parallel to the side support plates is fixedly arranged in the middle part of the front side of the lower end surface of the top plate, the lower ends of the side support plates located on the left and right sides of the top plate are respectively provided with through holes one that penetrate the plate body, the lower end of the middle support plate is provided with through holes two corresponding to the through holes one, the wheel axle is connected to the inside of through holes one and two and is fixedly connected to the side support plates and the middle support plate, the rollers include two, the two rollers are rotatably sleeved on the wheel axles, and the two rollers are respectively located on the left and right sides of the middle support plate.

[0013] A further preferred technical solution is that the top plate is provided with a central hole for the lower end of the lower shaft to movably pass through; and the corner of the bottom plate is provided with a waist-shaped hole that penetrates the plate body.

[0014] The advantages and beneficial effects of the utility model are:

[0015] 1. The utility model discloses an eccentric universal caster with good steering performance. The eccentric rotating assembly is designed as an integrated eccentric bearing assembly composed of an upper bearing assembly and a lower bearing assembly. Compared with the traditional eccentric bearing assembly assembled with an ordinary eccentric rotating shaft and a bearing, the rotation flexibility and load upper limit of the eccentric universal caster are significantly improved. The load can reach more than 2500kg, and when carrying heavy goods, it can still meet the flexible steering requirement of 180° in situ, and the steering flexibility is not limited by narrow space and small turning radius position; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0016] 2. The upper shaft body and the lower shaft body are integrally formed, thereby ensuring the overall structural strength of the eccentric shaft and the overall stability of the eccentric rotating assembly.

[0017] 3. The ball filling hole improves the convenience of filling the ball into the ball installation cavity, which helps to improve the assembly and processing efficiency of the eccentric universal caster with good steering performance of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a left front side perspective of the eccentric universal caster with good steering performance of the utility model;

[0019] Figure 2 It is a top view of the eccentric universal caster with good steering performance of the utility model;

[0020] Figure 3 yes Figure 2 Longitudinal section view of the eccentric swivel caster with good steering performance along the AA direction;

[0021] Figure 4This is a disassembled structural diagram of the eccentric universal caster with good steering performance of the utility model;

[0022] Figure 5 is a top-down perspective stereogram of the eccentric rotating assembly;

[0023] Figure 6 It is a disassembled structural diagram of the eccentric rotating assembly;

[0024] Figure 7 It is a stereoscopic view of the bracket from the left front side.

[0025] In the figure: 1, bottom plate; 2, eccentric rotating assembly; 3, bracket; 4, roller; 5, axle; 6, screw one; 7, screw two; 1-1, mounting hole one; 1-2, waist-shaped hole; 2-1, eccentric shaft; 2-1a, upper shaft body; 2-1b, lower shaft body; 2-2, upper bearing outer ring; 2-2a, threaded blind hole; 2-3, lower bearing outer ring; 2-3a, mounting hole two; 3-1, top plate; 3-1a, threaded hole; 3-1b, center hole; 3-2, side support plate; 3-2a, through hole one; 3-3, middle support plate; 3-3a, through hole two; K, ball mounting cavity; L, annular groove one; M, annular groove two; N, ball; P, ball filling hole; Q, plugging; Ⅰ, upper bearing assembly; Ⅱ, lower bearing assembly. DETAILED DESCRIPTION

[0026] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0027] Example

[0028] like Figures 1 to 7As shown, the utility model is an eccentric universal caster with good steering performance, comprising a base plate 1, an eccentric rotating component 2, a bracket 3, a roller 4 and a wheel axle 5, wherein the base plate 1 is rotatably mounted on the upper end of the eccentric rotating component 2, the upper end of the bracket 3 is rotatably mounted on the lower end of the eccentric rotating component 2, the roller 4 is rotatably mounted on the inner side of the lower end of the bracket 3 through the wheel axle 5, the eccentric rotating component 2 comprises an eccentric shaft 2-1, an upper bearing outer ring 2-2 and a lower bearing outer ring 2-3, the eccentric shaft 2-1 comprises an upper shaft body 2-1a and a lower shaft body 2-1b, the lower end of the upper shaft body 2-1a is eccentrically fixed to the upper end of the lower shaft body 2-1b, and the upper bearing outer ring 2-2 is sleeved on the outer periphery of the upper shaft body 2-1a The upper and lower bearing outer rings 2-3 are sleeved on the outer circumference of the lower shaft body 2-1b, and a ball mounting cavity K surrounding the outer circumference of the upper shaft body 2-1a is provided between the inner side surface of the upper bearing outer ring 2-2 and the outer side surface of the upper shaft body 2-1a, and a ball mounting cavity K surrounding the outer circumference of the lower shaft body 2-1b is provided between the inner side surface of the lower bearing outer ring 2-3 and the outer side surface of the lower shaft body 2-1b, and the ball mounting cavity K is filled with balls N. The upper bearing outer ring 2-2, the upper shaft body 2-1a and the balls N located in the ball mounting cavity K between the two constitute an upper bearing assembly I, and the lower bearing outer ring 2-3, the lower shaft body 2-1b and the balls N located in the ball mounting cavity K between the two constitute a lower bearing assembly II.

[0029] Preferably, the upper shaft body 2-1a and the lower shaft body 2-1b are integrally formed.

[0030] Further preferably, the outer side surface of the upper shaft body 2-1a and the outer side surface of the lower shaft body 2-1b are respectively provided with an annular groove 1L, the inner side surface of the upper bearing outer ring 2-2 and the inner side surface of the lower bearing outer ring 2-3 are respectively provided with an annular groove 2M, and the annular groove 1L and the corresponding annular groove 2M are butt-jointed to form the ball mounting cavity K.

[0031] Further preferably, bead filling holes P which are in communication with the corresponding annular grooves M are respectively provided on the outer peripheral walls of the upper bearing outer ring 2-2 and the lower bearing outer ring 2-3, and the inner diameter of the bead filling hole P is greater than the outer diameter of the ball N, and the bead filling hole P is sealed by an embedded seal Q.

[0032] Further preferably, the inner wall surface of the bead filling hole P is provided with a threaded structure, and the plugging Q is a hexagon socket screw, and the plugging Q is screwed and fixed inside the bead filling hole P.

[0033] Further preferably, the upper bearing outer ring 2-2 is provided with a plurality of threaded blind holes 2-2a surrounding the outer peripheral side of the corresponding annular groove 2M at an annular interval, the lower bearing outer ring 2-3 is provided with a plurality of mounting holes 2-3a surrounding the outer peripheral side of the corresponding annular groove 2M at an annular interval, the bottom plate 1 is provided with a plurality of mounting holes 1-1 corresponding to the threaded blind holes 2-2a on the upper bearing outer ring 2-2 at an annular interval, the bottom plate 1 is screwed and fixedly connected to the corresponding threaded blind holes 2-2a on the upper bearing outer ring 2-2 by means of screws 6 penetrating through the inside of the mounting holes 1-1, the top plate 3-1 located at the upper end of the bracket 3 is provided with a plurality of threaded holes 3-1a corresponding to the mounting holes 2-3a on the lower bearing outer ring 2-3 at an annular interval, the lower bearing outer ring 2-3 is screwed and fixedly connected to the corresponding threaded holes 3-1a on the top plate 3-1 by means of screws 7 penetrating through the inside of the mounting holes 2-3a.

[0034] Further preferably, the bracket 3 also includes side support plates 3-2 fixedly arranged in parallel at the left and right side edge positions of the lower end surface of the top plate 3-1, a middle support plate 3-3 parallel to the side support plate 3-2 is fixedly arranged in the middle of the front side of the lower end surface of the top plate 3-1, and the lower ends of the side support plates 3-2 located on the left and right sides of the top plate 3-1 are respectively provided with through holes 1 3-2a penetrating the plate body, and the lower end of the middle support plate 3-3 is provided with through holes 1 3-3a corresponding to the through holes 1 3-2a, the wheel axle 5 is connected to the inside of the through holes 1 3-2a and the through holes 2 3-3a and is fixedly connected to the side support plates 3-2 and the middle support plate 3-3, and the rollers 4 include two, the two rollers 4 are rotatably sleeved on the wheel axle 5, and the two rollers 4 are respectively located on the left and right sides of the middle support plate 3-3.

[0035] Further preferably, the top plate 3-1 is also provided with a central hole 3-1b for the lower end of the lower shaft body 2-1b to movably pass through; the corner of the bottom plate 1 is provided with a waist-shaped hole 1-2 that penetrates the plate body.

[0036] The utility model has an eccentric universal caster with good steering performance. The eccentric rotating component is designed as an integrated eccentric bearing component composed of an upper bearing component and a lower bearing component. Compared with the traditional eccentric bearing component assembled with an ordinary eccentric rotating shaft and a bearing, the rotation flexibility and load upper limit of the eccentric universal caster are significantly improved. The load can reach more than 2500kg, and when carrying heavy goods, it can still meet the flexible steering requirement of 180° in situ, and the steering flexibility is not limited by narrow spaces and small turning radius positions; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An eccentric universal caster with good steering performance, comprising a base plate (1), an eccentric rotating assembly (2), a bracket (3), a roller (4) and a wheel axle (5), wherein the base plate (1) is rotatably mounted on the upper end of the eccentric rotating assembly (2), the upper end of the bracket (3) is rotatably mounted on the lower end of the eccentric rotating assembly (2), and the roller (4) is rotatably mounted on the inner side of the lower end of the bracket (3) through the wheel axle (5), characterized in that: The eccentric rotating assembly (2) comprises an eccentric shaft (2-1), an upper bearing outer ring (2-2) and a lower bearing outer ring (2-3); the eccentric shaft (2-1) comprises an upper shaft body (2-1a) and a lower shaft body (2-1b); the lower end of the upper shaft body (2-1a) is eccentrically fixed to the upper end of the lower shaft body (2-1b); the upper bearing outer ring (2-2) is sleeved on the outer peripheral side of the upper shaft body (2-1a); the lower bearing outer ring (2-3) is sleeved on the outer peripheral side of the lower shaft body (2-1b); and a flange is provided between the inner side surface of the upper bearing outer ring (2-2) and the outer side surface of the upper shaft body (2-1a) to surround the upper shaft body (2 -1a), a ball installation cavity (K) surrounding the outer circumference of the lower shaft body (2-1b) is provided between the inner side surface of the lower bearing outer ring (2-3) and the outer side surface of the lower shaft body (2-1b), the ball installation cavity (K) is filled with balls (N), the upper bearing outer ring (2-2), the upper shaft body (2-1a) and the balls (N) located inside the ball installation cavity (K) between the two constitute an upper bearing assembly (I), and the lower bearing outer ring (2-3), the lower shaft body (2-1b) and the balls (N) located inside the ball installation cavity (K) between the two constitute a lower bearing assembly (II).

2. The eccentric universal caster with good steering performance as claimed in claim 1, characterized in that: The upper shaft body (2-1a) and the lower shaft body (2-1b) are integrally formed.

3. The eccentric universal caster with good steering performance as claimed in claim 2, characterized in that: The outer side surface of the upper shaft body (2-1a) and the outer side surface of the lower shaft body (2-1b) are respectively provided with an annular groove one (L), and the inner side surface of the upper bearing outer ring (2-2) and the inner side surface of the lower bearing outer ring (2-3) are respectively provided with an annular groove two (M), and the annular groove one (L) and the corresponding annular groove two (M) are butt-jointed to form the ball mounting cavity (K).

4. The eccentric universal caster with good steering performance as claimed in claim 3, characterized in that: The outer peripheral wall of the upper bearing outer ring (2-2) and the outer peripheral wall of the lower bearing outer ring (2-3) are respectively provided with a bead filling hole (P) which is in communication with the corresponding annular groove 2 (M), and the inner diameter of the bead filling hole (P) is greater than the outer diameter of the ball (N), and the bead filling hole (P) is sealed by an embedded seal (Q).

5. The eccentric universal caster with good steering performance as claimed in claim 4, characterized in that: The inner wall surface of the bead filling hole (P) is provided with a thread structure, and the plug (Q) is a hexagon socket screw, and the plug (Q) is screwed and fixed inside the bead filling hole (P).

6. The eccentric universal caster with good steering performance as claimed in claim 5, characterized in that: The upper bearing outer ring (2-2) is provided with a plurality of threaded blind holes (2-2a) circumferentially spaced around the outer circumference of the corresponding annular groove (M), the lower bearing outer ring (2-3) is provided with a plurality of mounting holes (2-3a) circumferentially spaced around the outer circumference of the corresponding annular groove (M), the bottom plate (1) is provided with a plurality of mounting holes (1-1) corresponding to the threaded blind holes (2-2a) on the upper bearing outer ring (2-2), and the bottom plate (1) is connected to the mounting holes (1-1) by passing through the mounting holes (1-1). 1) The inner screw 1 (6) is screwed and fixedly connected with the corresponding threaded blind hole (2-2a) on the upper bearing outer ring (2-2); a plurality of threaded holes (3-1a) corresponding to the mounting holes 2 (2-3a) on the lower bearing outer ring (2-3) are arranged at intervals in an annular direction on the top plate (3-1) located at the upper end of the bracket (3); the lower bearing outer ring (2-3) is screwed and fixedly connected with the corresponding threaded hole (3-1a) on the top plate (3-1) by means of the screw 2 (7) passing through the inside of the mounting hole 2 (2-3a).

7. The eccentric universal caster with good steering performance as claimed in claim 6, characterized in that: The bracket (3) further comprises side support plates (3-2) fixedly arranged in parallel at the left and right side edges of the lower end surface of the top plate (3-1); a middle support plate (3-3) parallel to the side support plate (3-2) is fixedly arranged at the middle part of the front side of the lower end surface of the top plate (3-1); the lower ends of the side support plates (3-2) located on the left and right sides of the top plate (3-1) are respectively provided with through holes (3-2a) penetrating the plate body; the lower end of the middle support plate (3-3) is provided with through holes (3-3a) corresponding to the through holes (3-2a); the wheel axle (5) is connected to the inside of the through holes (3-2a) and the through holes (3-3a) and is fixedly connected to the side support plates (3-2) and the middle support plate (3-3); the rollers (4) comprise two; the two rollers (4) are rotatably sleeved on the wheel axle (5), and the two rollers (4) are respectively located on the left and right sides of the middle support plate (3-3).

8. The eccentric universal caster with good steering performance as claimed in claim 7, characterized in that: The top plate (3-1) is also provided with a central hole (3-1b) for the lower end of the lower shaft body (2-1b) to movably pass through; the corner of the bottom plate (1) is provided with a waist-shaped hole (1-2) that penetrates the plate body.

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