Trundle

Abstract

The utility model provides a trundle. The trundle comprises a trundle frame, a first driving wheel, a second driving wheel, a first driving mechanism, a second driving mechanism and a vehicle body connecting seat, the vehicle body connecting seat is installed on the wheel carrier and used for connecting the wheel carrier to a vehicle body, a hinge head is arranged between the vehicle body connecting seat and the wheel carrier, the upper end of the hinge head is rotationally connected to the vehicle body connecting seat, the lower end of the hinge head is hinged to the middle of the wheel carrier, and the rotating axis of the upper end of the hinge head is perpendicular to the rotating axis of the lower end of the hinge head; the first driving wheel and the second driving wheel are rotationally connected to the two ends of the wheel frame correspondingly and located on the two radial sides of the rotating axis of the lower end of the hinge head correspondingly. The first driving mechanism and the second driving mechanism are both installed on the wheel frame and used for driving the first driving wheel and the second driving wheel to rotate correspondingly. The structure can prevent the trundle from being suspended, keep the adhesive force between the driving wheel and the ground, and ensure the driving reliability of the driving wheel.

Description

Technical Field

[0001] This utility model relates to the field of handling vehicle equipment technology, and more specifically, to a caster. Background Technology

[0002] As a tool for transporting goods, pallet trucks are widely used in warehousing and logistics, textiles, papermaking, food and other industries, becoming an indispensable tool in people's daily production and life. Ordinary pallet trucks usually use rigidly connected casters. The rigid structure of the casters has poor adhesion to the ground, resulting in the pallet truck having only one wheel on the ground when moving on uneven ground, which leads to poor movement or even tilting or tipping over. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the caster has poor adhesion to the ground, which makes the transport vehicle prone to tilting or tipping over. In order to overcome the above-mentioned defects of the prior art, this utility model provides a caster.

[0004] This utility model provides a caster, including a wheel frame, a first drive wheel, a second drive wheel, a first drive mechanism, a second drive mechanism, and a vehicle body connecting seat. The vehicle body connecting seat is mounted on the wheel frame and used to connect the wheel frame to a vehicle body. A hinge head is provided between the vehicle body connecting seat and the wheel frame. The upper end of the hinge head is rotatably connected to the vehicle body connecting seat, and the lower end of the hinge head is hinged to the middle of the wheel frame. The rotation axis of the upper end of the hinge head and the rotation axis of the lower end of the hinge head are perpendicular to each other. The first drive wheel and the second drive wheel are respectively rotatably connected to both ends of the wheel frame and are located on the radial sides of the rotation axis of the lower end of the hinge head. The first drive mechanism and the second drive mechanism are both mounted on the wheel frame, and the first drive mechanism and the second drive mechanism are respectively used to drive the rotation of the first drive wheel and the second drive wheel.

[0005] Compared with the prior art, the caster proposed in this application has the following advantages: by setting a hinge head, the upper end of the hinge head is rotatably connected to the vehicle body connecting seat, and the lower end of the hinge head is hinged to the middle of the vehicle frame. The first drive mechanism drives the first drive wheel to rotate, and the second drive mechanism drives the second drive wheel to rotate. This allows the vehicle frame to achieve free circumferential rotation or forward and backward movement, and the two ends of the vehicle frame can rotate around the middle of the vehicle frame, so that at least one drive wheel can contact the ground, avoiding the caster from being suspended in the air, maintaining the adhesion between the drive wheel and the ground, and ensuring the driving reliability of the drive wheel.

[0006] In one possible implementation, a hinge shaft is fixedly connected to the lower end of the hinge head, a hinge seat is fixedly connected to the wheel frame, the hinge seat is provided with a hinge hole, and the hinge shaft is rotatably connected in the hinge hole.

[0007] Compared with existing technologies, the above technical solution can achieve a hinged connection between the hinge head and the wheel frame, and the hinged connection is stable and reliable.

[0008] In one possible implementation, a first bearing is provided between the hinge hole and the hinge shaft.

[0009] Compared with existing technologies, the above technical solution can improve the reliability of the hinge connection between the hinge head and the wheel frame.

[0010] In one possible implementation, a second bearing is sleeved on the upper end of the hinge head, and the hinge head is rotatably connected to the vehicle body connecting seat through the second bearing.

[0011] Compared with existing technologies, the above technical solution can improve the rotational reliability of the hinge head and the vehicle body connection seat.

[0012] In one possible implementation, the first drive mechanism includes a drive motor, a drive gear, a transmission gear, a driven gear, and a rotating shaft. The drive motor is mounted on a wheel frame, the drive gear is fixed on the output shaft of the drive motor, the rotating shaft is rotatably mounted on the wheel frame, the driven gear is fixed on the rotating shaft, the transmission gear is rotatably connected to the wheel frame and meshes with the drive gear and the driven gear, and the first drive wheel is connected to the rotating shaft.

[0013] Compared with existing technologies, the above technical solution can achieve stable driving of the drive wheel by the drive mechanism and improve transmission reliability through the gear transmission structure.

[0014] In one possible implementation, a speed reduction assembly is provided between the first drive wheel and the shaft. The speed reduction assembly includes a sun gear, planet gears, a planet carrier, and an internal gear ring. The sun gear is fixedly connected to the shaft, the internal gear ring is fixed to the gear carrier and coaxially arranged with the sun gear, the planet gears are rotatably connected to the planet carrier, and the planet gears mesh with the sun gear and the internal gear ring respectively. The planet carrier is fixedly connected to the first drive wheel.

[0015] Compared with existing technologies, the above technical solution can reduce the speed of the drive wheel, increase the torque of the drive wheel, and improve the driving reliability of the caster.

[0016] In one possible implementation, there are three planetary gears, which are circumferentially distributed on the planet carrier.

[0017] Compared with existing technologies, the above technical solution can improve the reliability of deceleration operation.

[0018] In one possible implementation, both the first drive wheel and the second drive wheel are provided with wear-resistant and non-slip rubber rims.

[0019] Compared with existing technologies, the above technical solution can increase the friction between the drive wheel and the ground, and improve drive reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-section of the present invention. Figure 1 ;

[0022] Figure 3 This is a cross-section of the present invention. Figure 2 ;

[0023] Figure 4 This is a cross-section of the present invention. Figure 3 ;

[0024] Figure 5 This is a cross-section of the present invention. Figure 4 ;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Wheel frame; 2. First drive wheel; 3. Second drive wheel; 4. First drive mechanism; 41. Drive motor; 42. Driving gear; 43. Transmission gear; 44. Driven gear; 45. Shaft; 5. Second drive mechanism; 6. Body connecting seat; 7. Hinge head; 8. Hinge shaft; 9. Hinge seat; 91. Hinge hole; 10. First bearing; 20. Second bearing; 30. Reduction assembly; 301. Sun gear; 302. Planet gears; 303. Planet carrier; 304. Internal gear ring; 40. Rubber rim. Detailed Implementation

[0027] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] See Figures 1 to 5 This application discloses a caster, including a wheel frame 1, a first drive wheel 2, a second drive wheel 3, a first drive mechanism 4, a second drive mechanism 5, and a vehicle body connecting seat 6. The vehicle body connecting seat 6 is mounted on the wheel frame 1 and used to connect the wheel frame 1 to a vehicle body. A hinge head 7 is provided between the vehicle body connecting seat 6 and the wheel frame 1. The upper end of the hinge head 7 is rotatably connected to the vehicle body connecting seat 6, and the lower end of the hinge head 7 is hinged to the middle of the wheel frame 1. The rotation axis of the upper end of the hinge head 7 is perpendicular to the rotation axis of the lower end of the hinge head 7. The first drive wheel 2 and the second drive wheel 3 are respectively rotatably connected to both ends of the wheel frame 1 and are respectively located on both radial sides of the rotation axis of the lower end of the hinge head 7. The first drive mechanism 4 and the second drive mechanism 5 are both mounted on the wheel frame 1, and the first drive mechanism 4 and the second drive mechanism 5 are respectively used to drive the rotation of the first drive wheel 2 and the second drive wheel 3. The rotation axis of the upper end of the hinge head 7, the rotation axis of the lower end of the hinge head 7, and the rotation axis of the drive wheel are all set perpendicular to each other.

[0032] As can be seen from the above, by setting the hinge head 7, the upper end of the hinge head 7 is rotatably connected to the vehicle body connecting seat 6, and the lower end of the hinge head 7 is hinged to the middle of the frame. The first drive mechanism 4 drives the first drive wheel 2 to rotate, and the second drive mechanism 5 drives the second drive wheel 3 to rotate. This allows the frame to rotate freely in the circumference or move back and forth, and the two ends of the frame can rotate around the middle of the frame, so that at least one drive wheel can contact the ground, avoiding the casters from being suspended in the air, maintaining the adhesion between the drive wheel and the ground, and ensuring the driving reliability of the drive wheel.

[0033] See also Figure 2In this embodiment, a hinge shaft 8 is fixedly connected to the lower end of the hinge head 7, and a hinge seat 9 is fixedly connected to the wheel frame 1. The hinge seat 9 has a hinge hole 91, and the hinge shaft 8 is rotatably connected within the hinge hole 91. This enables the hinge head 7 and the wheel frame 1 to be hinged, and the hinge connection is stable and reliable. Specifically, a first bearing 10 is provided between the hinge hole 91 and the hinge shaft 8 to improve the reliability of the hinge connection between the hinge head 7 and the wheel frame 1. The first bearing 10 is a self-lubricating bearing.

[0034] In this embodiment, a second bearing 20 is sleeved on the upper end of the hinge head 7, and the hinge head 7 is rotatably connected to the vehicle body connecting seat 6 through the second bearing 20, thereby improving the rotational reliability of the hinge head 7 and the vehicle body connecting seat 6. The second bearing 20 is a ball bearing.

[0035] See also Figure 3 and Figure 4 In this embodiment, the first drive mechanism 4 includes a drive motor 41, a driving gear 42, a transmission gear 43, a driven gear 44, and a rotating shaft 45. The drive motor 41 is mounted on the wheel frame 1. The driving gear 42 is fixed on the output shaft of the drive motor 41. The rotating shaft 45 is rotatably mounted on the wheel frame 1. The driven gear 44 is fixed on the rotating shaft 45. The transmission gear 43 is rotatably connected to the wheel frame 1 and meshes with the driving gear 42 and the driven gear 44. The first drive wheel 2 is connected to the rotating shaft 45. The second drive mechanism 5 has the same structure as the first drive mechanism 4, thereby enabling stable driving of the drive wheel by the drive mechanism. The gear transmission structure improves transmission reliability. The drive motor 41 is a servo motor.

[0036] See also Figure 4 and Figure 5 In this embodiment, a speed reduction assembly 30 is provided between the first drive wheel 2 and the rotating shaft 45. The speed reduction assembly 30 includes a sun gear 301, planet gears 302, a planet carrier 303, and an internal gear ring 304. The sun gear 301 is fixedly connected to the rotating shaft 45. The internal gear ring 304 is fixed to the wheel carrier 1 and coaxially arranged with the sun gear 301. The planet gears 302 are rotatably connected to the planet carrier 303 and mesh with the sun gear 301 and the internal gear ring 304 respectively. The planet carrier 303 is fixedly connected to the first drive wheel 2. This allows the drive wheel to be decelerated, increasing the torque of the drive wheel and improving the driving reliability of the caster. Specifically, there are three planet gears 302, which are circumferentially distributed on the planet carrier 303. The sun gear 301 is integrally formed on the rotating shaft 45, improving structural reliability.

[0037] In this embodiment, both the first drive wheel 2 and the second drive wheel 3 are provided with wear-resistant and non-slip rubber rims 40, which can increase the friction between the drive wheel and the ground and improve the reliability of the drive.

[0038] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A caster wheel characterized by, The utility model relates to a kind of wheel chair, including wheel frame (1), first drive wheel (2), second drive wheel (3), first drive mechanism (4), second drive mechanism (5) and car body connecting seat (6); The car body connecting seat (6) is installed on the wheel frame (1) and is used to connect the wheel frame (1) to the car body, a hinge head (7) is provided between the car body connecting seat (6) and the wheel frame (1), the upper end of the hinge head (7) is rotatably connected to the car body connecting seat (6), and the lower end of the hinge head (7) is hingedly connected to the middle part of the wheel frame (1); the rotational axis of the upper end of the hinge head (7) is perpendicular to the rotational axis of the lower end of the hinge head (7). The first drive wheel (2) and the second drive wheel (3) are rotatably connected to the two ends of the wheel frame (1) respectively, and are located on the radial sides of the rotational axis of the lower end of the hinge head (7) respectively. The first drive mechanism (4) and the second drive mechanism (5) are both installed on the wheel frame (1), and are used to drive the rotation of the first drive wheel (2) and the second drive wheel (3) respectively.

2. The caster according to claim 1, wherein The lower end of the hinge head (7) is fixedly connected with a hinge shaft (8), the wheel frame (1) is fixedly connected with a hinge seat (9), the hinge seat (9) is provided with a hinge hole (91), and the hinge shaft (8) is rotatably connected in the hinge hole (91).

3. The caster according to claim 2, wherein A first bearing (10) is provided between the hinge hole (91) and the hinge shaft (8).

4. The caster according to claim 2, wherein The upper end of the hinge head (7) is sleeved with a second bearing (20), and the hinge head (7) is rotatably connected to the car body connecting seat (6) through the second bearing (20).

5. The caster according to claim 1, wherein The first drive mechanism (4) comprises a drive motor (41), a driving gear (42), a transmission gear (43), a driven gear (44) and a rotating shaft (45), the drive motor (41) is installed on the wheel frame (1), the driving gear (42) is fixed on the output shaft of the drive motor (41), the rotating shaft (45) is rotatably arranged on the wheel frame (1), the driven gear (44) is fixed on the rotating shaft (45), the transmission gear (43) is rotatably connected to the wheel frame (1) and is in mesh transmission with the driving gear (42) and the driven gear (44), and the first drive wheel (2) is connected to the rotating shaft (45).

6. The caster according to claim 5, wherein A speed reduction assembly (30) is provided between the first drive wheel (2) and the rotating shaft (45), the speed reduction assembly (30) comprises a sun gear (301), a planet gear (302), a planet carrier (303) and an inner ring gear (304), the sun gear (301) is fixedly connected to the rotating shaft (45), the inner ring gear (304) is fixedly connected to the wheel frame (1) and is coaxially arranged with the sun gear (301), the planet gear (302) is rotatably connected to the planet carrier (303), the planet gear (302) is in mesh with the sun gear (301) and the inner ring gear (304) respectively, and the planet carrier (303) is fixedly connected with the first drive wheel (2).

7. The caster according to claim 6, wherein The number of the planet gears (302) is three, and the three planet gears (302) are distributed around the planet carrier (303).

8. The caster according to claim 1, wherein The first driving wheel (2) and the second driving wheel (3) are both provided with wear-resistant and anti-skid rubber rims (40).

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