GB2590746A

GB2590746A - Golf cart with dual wheel being controlled at same speed

Info

Publication number: GB2590746A
Application number: GB2009175.7A
Authority: GB
Inventors: Gong Jiaxiong; Gong Qian
Original assignee: CHANGZHOU TAIDE GOLF PRODUCTS CO Ltd
Current assignee: CHANGZHOU TAIDE GOLF PRODUCTS CO Ltd
Priority date: 2019-12-24
Filing date: 2020-06-16
Publication date: 2021-07-07
Anticipated expiration: 2040-06-16
Also published as: GB2590746B; CN211328044U; GB202009175D0

Abstract

A golf cart with dual wheels being controlled at same speed, characterized in that the golf cart comprises two rear wheels (18) and a driving mechanism; the driving mechanism is connected to the two rear wheels (18) respectively through output shafts (4) and capable of controlling the two rear wheels (18) separately; each output shaft (4) is provided with a gear (19) coaxially arranged therewith; and the golf cart further comprises a Hall sensor (20) for detecting the rotation of the gear (19).

Description

GOLF CART WITH DUAL WHEEL BEING CONTROLLED AT SAME SPEED

TECHNICAL FIELD

The present invention relates to the technical field of a ball cart and particularly to a golf cart with dual wheel being controlled at same speed.

BACKGROUND

The ball cart is used as a transportation device for carrying ball bags in golf The straight traveling function of the existing remote-control ball cart is mainly realized through a gyroscope. The entire control process is relatively complicated.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a golf cart with dual wheel being controlled at same speed, thereby solving the technical problem that the straight traveling control of the ball cart is complicated.

A golf cart with dual wheel being controlled at same speed of the present invention is realized as follows.

A golf cart with dual wheel being controlled at same speed includes two rear wheels and a driving mechanism. The driving mechanism is connected to the two rear wheels respectively through output shafts and capable of controlling the two rear wheels separately. Each output shaft is provided with a gear coaxially arranged therewith. The golf cart further includes a Hall sensor for detecting the rotation of the gear.

Further, the golf cart further includes a cart body and a front wheel provided on the front side of the cart body. Two rear wheels arc provided on two sides of the cart body respectively.

Further, the driving mechanism is provided in the cart body. The driving mechanism includes two motors and speed reducer assemblies. The speed reducer assembly is connected to the motor in one-to-one correspondence. The motor is drivingly connected to the output shaft through the corresponding speed reducer assembly.

Further, two speed reducer assemblies are provided in the same casing. The casing is assembled with two oppositely arranged half casings, and the half casings are connected by screws and bolts.

Further, the speed reducer assembly includes a worm wheel assembly that engages with a motor worm of the motor. The worm wheel assembly is drivingly connected to the corresponding output shaft.

Further, the worm wheel assembly includes a worm wheel and a metal insert fixed inside the worm wheel. The output shaft corresponding to the worm wheel assembly passes through the central hole inside the metal insert. A gap is left between the outer wall of the output shaft and the metal insert.

Further, the central hole of the metal insert is provided with an embedded groove. A worm wheel pin is radially provided on the output shaft. The worm wheel pin cooperates with the embedded groove Further, the worm wheel assembly is provided in the casing through bearings I on both sides of the worm wheel assembly. The output shaft is provided in the casing through bearing H. Further, the axial length of the metal insert is greater than the axial length of the worm wheel. The bearings I are provided on the metal insert on both sides of the worm wheel.

Further, an end of the motor worm is provided in the worm posit on lg block. The worm positioning block is detachably mounted on the casing, Further, the Hall sensor is mounted on the easing outside the gear, and is opposed to the outer ring surface of the gear.

Further, a control box is provided on the rear side of the driving mechanism. The control box is connected to the Hall sensor and the driving mechanism.

Further, a battery is provided above the driving mechanism.

After utilizing the above technical solutions, the beneficial effects of the present invention are as follows: The present invention uses the Hall sensors in combination with the gear to detect the rotation speeds of the two rear wheels of the ball cart respectively, so that the rotation speeds of the two rear wheels are kept equal to realize the straight traveling of the ball cart. The control process is simple, reliable and practical.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described with reference to the accompanying drawings and the embodiments below.

FIG. 1 is a structural diagram of a golf cart with dual wheel being controlled at same speed according to a preferred embodiment of the present invention; FIG. 2 is a rear view of a golf cart with dual wheel being controlled at same speed according to a preferred embodiment of the present invention; FIG. 3 is a cross-sectional view in direction A-A of FIG. 2; FIG. 4 is a structural diagram showing the cooperation of the driving mechanism and output shaft according to a preferred embodiment of the presentinvention; FIG. 5 is a top view showing the cooperation of the driving mechanism and output shaft according to a preferred embodiment of the present invention; FIG. 6 is a cross-sectional view in direction of B-B of FIG. 5; FIG. 7 is an enlarged view of part D in FIG. 6; FIG. 8 is a cross-sectional view in direction of C-C of FIG. 5; FIG. 9 is a structural diagram inside the casing where the driving mechanism and the output shaft cooperate according to a preferred embodiment of the present invention; FIG. 10 is an enlarged view of part E in FIG. 9; FIG. 11 is a structural view of the worm wheel assembly of the driving mechanism according to a preferred embodiment of the present invention; and FIG. 12 is a control schematic diagram of a golf cart with dual wheel being controlled at same speed according to a preferred embodiment of the present invention.

In the FIGS: motor-1, casing-2, motor worm-3, output shaft-4, bearing 1-5, bearing 11-6, worm whee1-7, metal insert-8, weight reducing hole-9, half casing-10, mounting hole-11, embedded groove-12, worm wheel pin-13, worm positioning block-14, circular aperture-15, cart body-16, front wheel-U, rear wheel-18. gear-19, Hall sensor-20, control box-21, batten-22, universal wheel carrier-23, push rod-24, connecting rod-25, bottom bracket-26, upper bracket-27, handle-28, and support wheel-29.

DETAILED DESCRIPTION

Referring to the accompanying drawings, the objective, technical solutions and advantages of the present invention will become clearer in combination with the preferred embodiments described below. Obviously, the described embodiments are only part of the present invention, and cannot represent all the embodiments thereof Therefore, the detailed description of the present invention provided below as well as the accompanying drawings is not intended to limit the scope of the present invention, but merely represents illustrative embodiments of the present invention. After reading the present invention, those skilled in the art may obtain other embodiments without creative work, and all the embodiments thus obtained are within the protection scope of the present invention.

Referring to FIGS. 1-12, a golf cart with dual wheel being controlled at same speed includes two rear wheels 18, and a driving mechanism; and the driving mechanism is connected to the two rear wheels 18 respectively through output shafts 4 and is capable of controlling the two rear wheels 18 separately. Each output shaft 4 is provided with a gear 19 coaxially arranged therewith. The golf cart further includes a Hall sensor 20 for detecting the rotation of the gear 19.

When the ball cart is traveling straight, the rotation speed of the two rear wheels 18 (i.e., the left and right rear wheels) must be the same, that is, the rotation speed of the output shafts 4 connected to the two rear wheels 18 must be the same. Therefore, in this embodiment, the rotation speed of the two output shafts 4 is detected in real time by using the Hall sensor 20 and the gear 19, and adjustments are made in time, so as to ensure that the left rear wheel and the right rear wheel rotate synchronously, thereby realizing the straight traveling of the ball cart.

In order to support the entire ball cart, the golf cart further includes a cart body 16 and a front wheel 17 provided on the front side of the cart body 16. The two rear wheels 18 are provided on the two sides of the cart body 16, respectively.

Referring to FIGS. 4-11, in order to provide power for the ball cart movement, the driving mechanism is mounted in the cart body 16. The driving mechanism includes two motors I, and speed reducer assemblies connected to the motors 1 in one-to-one correspondence. The motor 1 is drivingly connected to the output shaft 4 through the corresponding speed reducer assembly.

In this embodiment, the two motors I are arranged in parallel. The two speed reducer assemblies are arranged symmetrically. The axial direction of the speed reducer assemblies and the output shafts 4 is the same as the parallel direction of the motors I, which is convenient for connecting to the two rear wheels 18 of the ball cart.

The casing 2 of the existing speed reducer assembly generally adopts a split structure, that is, the casing 2 is formed by assembling multiple plastic parts. However, due to the deformation of the plastic parts and assembly errors, problems such as unstable operation, high noise, and biting the worm wheels 7 are prone to occur. Therefore, in this embodiment, the two speed reducer assemblies are provided in the same casing 2. The casing 2 is assembled with two oppositely arranged half casings 10 which are connected by screws and bolts.

The shape of the half casing 10 can be selected according to the specific components structure of the speed reducer assemblies therein. The assembling direction is the same as the axial direction of the output shafts 4. The two half casings 10 are assembled oppositely. In this way, assembly errors may be reduced, the overall accuracy of the driving mechanism may be improved, and operating noise may also be reduced, hi addition, the half casings 10 are provided with a plurality of mounting holes 11 arranged oppositely. Bolts and screws are installed in the mounting holes 11 so as to assemble the two half casings 10.

For the transmission between the motor 1 and the output shaft 4, the speed reducer assembly includes worm wheel assembly that engages with the motor worm 3 of the motor 1. The worm wheel assembly is drivingly connected with the corresponding output shaft 4.

The worm wheel assembly includes a worm wheel 7, and a metal insert 8 fixed inside the worm wheel 7. The output shaft 4 corresponding to the wonn wheel assembly passes through a central hole inside the metal insert 8. A gap is left between the outer wall of the output shaft 4 and the metal insert 8.

The existing worm wheel 7 is made of integral plastic material. Only a metal sleeve with a small wall thickness is provided in the central hole of the worm wheel 7 to realize the connection with the output shaft 4. The worm wheel 7 is made of a thick plastic material, which is easy to deform during operation. The outer-ring gear of the worm wheel 7 changes greatly, the runout is also large, and the consistency is poor Therefore, in this embodiment, a metal insert 8 with a large radial thickness is used to achieve stable support for the wonn wheel 7, in this way, the defonnation and runout of the outer ring of the worm wheel 7 are effectively reduced, the dimensional accuracy of the outer ring of thL worm whcel 7 is guaranteed, the consistency is improved, and the operating noise is reduced.

Preferably, the metal insert 8 may be an aluminum insert, thereby reducing the weight of the entire worm wheel assembly.

Specifically, the metal insert 8 is fixed in the inner hole of the worm wheel 7, and the synchronous rotation of the metal insert 8 can be driven by the rotation of the worm wheel 7.

Preferably, the side wall of the metal insert 8 is provided with several weight reducing holes 9, which can also reduce the weight of the entire worm wheel assembly.

In order to realize the torque transmission between the wonn wheel assembly and the output shaft 4, the central hole of the metal insert 8 is provided with an embedded groove 12. The output shaft 4 is radially provided with a WOM1 wheel pin 13. The worm wheel pin 13 cooperates with the embedded groove 12.

When the output shaft 4 is assembled in the central hole of the metal insert 8, both ends of the worm wheel pin 13 are installed in the metal insert 8 through die embedded groove 12. When the worm wheel assembly rotates, the synchronous rotation of the output shaft 4 is driven by the cooperation of the worm wheel pin 13 and the embedded groove 12, thereby realizing the rotation of the rear wheels 18.

There is a gap between the wonn wheel assembly and the output shaft 4, and there is also a gap between the worm wheel pin 13 and the embedded groove 12.

Wherein, the gap between the worm wheel assembly and the output shaft 4 is the gap between the output shaft 4 and the metal insert 8. Preferably, the distance of the gap is 0.1-1 mm. More preferably, the distance of the gap is 0.7-0.8 mm.

Preferably, the distance of the gap between the worm wheel pin 13 and the groove 12 is 0.2-2 mm. More preferably, the distance of the gap between the worm wheel pin 13 and the groove 12 is 0.8-1.2 mm.

The above two gaps are provided to prevent the output shaft 4 from affecting the worm wheel assembly when deformed.

For the deceleration engine used to drive the rotation of the two rear wheels 18 on the ball cart, the output shaft 4 and the worm wheel 7 are assembled together. That is, two bearings are provided to fix the output shaft 4 and the worm wheel 7 at the position where they are assembled. When the two output shafts 4 are subjected to external forces, the output shafts 4 will directly transmit the forces to the worm wheels 7. The WOM1 wheel assembly is installed in the casing 2 through the bearings I 5 on both sides thereof. The output shaft 4 is installed in the casing 2 through the bearing IT 6.

The output shaft 4 and the worm wheel assembly are supported separately, and there is a gap between the two. The output shaft 4 and the worm wheel assembly do not interfere with each other. The twisting of the output shaft 4 will not affect the worm wheel 7, thereby ensuring the smooth operation of the worm wheel 7, and preventing the external force applied on the output shaft 4 from affecting the engagement between the worm wheel 7 and the motor worm 3, hi order to support the output shaft 4, bearings II 6 are installed on the inner end of the output shaft 4 and the part of the output shaft 4 at the end of the casing 2, respectively.

In order to support the worm wheel 7 through the bearing I 5, the axial length of the metal insert 8 is greater than the axial length of the worm wheel 7. The bearing I 5 is installed on the metal insert 8 on both sides of the worm wheel 7.

The inner ring of the bearing I 5 cooperates with the metal insert 8, and the outer ring of the bearing 1 5 is installed on the inner wall of the casing 2 to support and fix the entire worm wheel assembly.

In order to increase the smoothness of the operation of the motor worms 3, the end of the motor worm 3 is installed in the worm positioning block 14. The worm positioning block 14 is detachably installed on the casing 2 Specifically, a circular aperture 15 is provided inside the worm positioning Hock 14, and the end of the motor worm 3 is installed in the circular aperture 15. The end of the conventional motor worm 3 is directly installed in the circular aperture 15 which is integrally provided on the casing 2. When the casing 2 is deformed, the concentricity between the circular aperture 15 and the motor worm 3 cannot be guaranteed. After the forced assembly, the motor worm 3 will be twisted, resulting in a poor operating state and noise. Therefore, in this embodiment, a worm positioning block 14 with a circular aperture 15 is provided, which is separated from the casing 2. During assembly, the motor 1 and the speed reducer assembly are installed first, and then the worm positioning block 14 is installed on the casing 2 and performs self-positioning according to the motor worm 3. In this way, the concentricity between the circular aperture 15 and the motor worm 3 as well as the smooth operation of the motor worm 3 is ensured, and the operating noise is greatly reduced.

In order to realize the cooperation between the Hall element and the gear 19, the Hall sensor 20 is installed on the casing 2 outside the gear 19 and is opposite to the outer ring surface of the gear 19.

Specifically, in this embodiment, the Hall sensor 20 is installed on the half casing 10 at which side the motor 1 is located. The gear 19 rotates synchronously with the output shaft 4 The Hall sensor 20 is capable of detecting the rotation speed of the output shaft 4 by counting the teeth number of the rotating gear 19.

The Hall sensor 20 and the corresponding gear 19 on the output shaft 4 are matched to form a Hall gear speed sensor, thereby realizing real-time speed detection of each rear wheel.

The Hall sensor 20 may include, but is not limited to, a Hall sensor of model 920! UK In addition, the element for detecting the rotation speed of the output shaft 4 is not limited to the Hall sensor 20, and can also be realized by using an element such as a photoelectric sensor or an encoder.

Referring to FIGS. 1-3, in order to realize automatic speed adjustment of the left rear wheel and the right rear wheel, a control box 21 which is connected to the Hall sensor 20 and the driving mechanism is provided on the rear side of the driving mechanism.

Specifically, the control box 21 is provided inside the cart body 16, and a controller is provided inside the control box 21. The controller can receive the signal sent by the Hall sensor 20. When the rotation speeds of the two output shafts 4 are different, the controller controls the rotation speed of the motor 1 through the motor driver, thereby adjusting the rotation speed of one or both of the output shafts 4, so as to ensure that the two rear wheels 18 have the same rotation speed and to realize the straight traveling of the ball cart.

Specifically, the rear wheels 18 include a left rear wheel and a right rear wheel. Correspondingly, the motor 1 connected to the left rear wheel is the left motor, and the motor 1 connected to the right rear wheel is the right motor. The controller adjusts the speeds of the two rear wheels 18 by controlling the left motor and the right motor respectively.

Preferably, the controller may include, but is not limited to, a m crocontroller of model STM32F103C8T6.

In order to power the entire control system of the cart, a battery 22 is installed above the driving mechanism.

The battery 22 includes a plurality of battcrics, all of which are arranged inside the cart body 16.

Preferably, the battery 22 can be a lithium battery.

Preferably, in order to facilitate the movement, rotation and folding of the ball cart, the front wheel 17 is hinged to the front end of the cart body 16 through the universal wheel carrier 23. A push rod 24 is provided above the cart body 16. The push rod 24 and the universal wheel carrier 23 are connected by a connecting rod 25 hinged at both ends which is hidden in the cart body 16.

In addition, for the convenient placement of the ball bag, a bottom bracket 26 is provided on the universal wheel carrier 23. An upper bracket 27 is provided on the front side of the push rod 24. The ball bag can be placed on the bottom bracket 26 and fixed with the upper bracket 27.

A handle 28 is provided above the push rod 24, which is convenient for manually pushing the ball cart.

The rear side of the cart body 16 is provided with a support wheel 29, which can ensure the stability of the ball cart.

Specifically, both the front wheel 17 and the support wheel 29 are provided in pairs.

Referring to FIG. 12, when the ball cart is in use, the motors 1 is started. The motors 1 drives the two rear wheels 18 to rotate through the speed reducer assemblies, realizing the movement of the ball cart. When the ball cart is traveling straight, the Hall sensor 20 detects the rotation signals of the two output shafts 4 (i.e., the two rear wheels 18) in real time through the cooperation with the gear 19 on the output shaft 4, and sends the rotation signals to the controller. The controller processes the rotation signals to obtain the real-time rotation speeds of the two rear wheels 18. When the rotational speeds of the two rear wheels 18 are different, the controller uses the motor driver to adjust the rotation speed of one or two of the motors 1, that is, to speed up or slow down the rotation speed of one motor 1, or to speed up the rotation speed of one motor 1 and to slow down the rotation speed of the other motor 1, so that the rotation speeds of the two rear wheels 18 remain the same, ensuring the straight traveling of the ball cart.

Inspired by the above embodiments of the present invention, those skilled in the art can make various changes and modifications based on the above description, without departing from the spirit of the present invention. The scope of the present invention is not limited to the above description, and the protection scope of the present application is defined by the claims.

Claims

CLAIMS1. A golf cart with dual wheel being controlled at same speed, characterized in that the golf cart comprises two rear wheels (18) and a driving mechanism; the driving mechanism is connected to the two rear wheels (18) respectively through output shafts (4) and capable of controlling the two rear wheels (18) separately; each output shaft (4) is provided with a gear (19) coaxially arranged therewith; and the golf cart further comprises a Hall sensor (20) for detecting the rotation of the gear (19).
2. The golf cart with dual wheel being controlled at same speed according to claim 1, characterized in that the golf cart further comprises a cart body (16) and a front wheel (17) provided on the front side of the cart body (16), and the two rear wheels (18) are provided on two sides of the cart body (16) respectively.
3. The golf cart with dual wheel being controlled at same speed according to claim 2, characterized in that the driving mechanism is provided in the cart body (16); the driving mechanism includes two motors (1) and speed reducer assemblies; the speed reducer assembly is connected to the motor (1) in one-to-one correspondence; and the motor (1) is drivingly connected to the output shaft (4) through the corresponding speed reducer assembly.
4. The golf cart with dual wheel being controlled at same speed according to claim 3, characterized in that two speed reducer assemblies are provided in same casing (2), the casing (2) is assembled with two oppositely arranged half casings (10), and the half casings (10) are connected by screws and bolts
5. The golf cart with dual wheel being controlled at same speed according to claim 4, characterized in that the speed reducer assembly includes a worm wheel assembly that engages with a motor worm (3) of the motor (1), and the worm wheel assembly is drivingly connected to the corresponding output shaft (4).
6. The golf cart with dual wheel being controlled at same speed according to claim 5, characterized in that the worm wheel assembly includes a worm wheel (7) and a metal insert (8) fixed inside the worrn wheel (7); the output shaft (4) corresponding to the worm wheel assembly passes through the central hole inside the metal insert (8); and a gaps is left between the outer wall of the output shaft (4) and the metal insert (8).
7. The golf cart with dual wheel being controlled at same speed according to claim 6, characterized in that the central hole of the metal insert (8) is provided with an embedded groove (12); a worm wheel pin (13) is radially provided on the output shaft (4); and the worm wheel pin (13) cooperates with the embedded groove (12).
8. The golf cart with dual wheel being controlled at same speed according to claim 6, characterized in that the worm wheel assembly is provided in the casing (2) through bearings 1 (5) on both sides of the worm wheel assembly; and the output shaft (4) is provided in the casing (2) through bearing 11 (6).
9. The golf cart with dual wheel being controlled at same speed according to claim 8, characterized in that the axial length of the metal insert (8) is greater than the axial length of the worm wheel (7); and the bearings I (5) are provided on the metal insert (8) on both sides of the worm wheel (7).
10. The golf cart with dual wheel being controlled at same speed according to claim 5, characterized in that an end of the motor wonn (3) is provided in the worm positioning block (14); and the worm positioning block (14) is detachably mounted on the casing (2).
I I. The golf cart with dud wheel being controlled at same speed according to claim 4, characterized in that the Hall sensor (20) is mounted on the casing (2) outside the gear (19), and is opposed to the outer ring surface of the gear (19).
12. The golf cart with dual wheel being controlled at same speed according to claim 1, characterized in that a control box (21) is provided on the rear side of the driving mechanism; and the control box (21) is connected to the Hall sensor (20) and the driving mechanism (21).
13. The golf cart with dual wheel being controlled at same speed according to claim 1, characterized in that a battery (22) is provided above the driving mechanism.