An electric power-assisted steering bridge system suitable for use with a fork lift truck

Abstract

The application discloses a kind of electric power steering bridge systems suitable for fork truck use, including bridge body, the center of the bridge body is provided with motor, the side of the motor is provided with speed reducer, and motor output end is connected with speed reducer input end, the motor is installed on the front casing of speed reducer, and the surface of the bridge body is provided with connecting rod on both sides.The present application drives gear wheel to drive passive gear to rotate by idler gear, due to the limitation of gear ring and planet carrier, passive gear drives first planetary gear to rotate;In the preliminary cooperation of driving gear, idler gear and passive gear, and the speed reduction cooperation of first planetary gear train and second planetary gear train, the space size of steering system is greatly simplified, which is beneficial to the space arrangement of the whole vehicle, the limiting cooperation of axle and end cover is used, the spline connection is saved, the positioning accuracy is high, the spline transmission noise is less and the loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric drive steering, and particularly relates to an electric power-assisted steering bridge system suitable for forklifts. BACKGROUND

[0002] Traditional power-assisted steering systems usually adopt hydraulic power-assisted steering systems, the power source of which is derived from a hydraulic pump, and the power-assisted adjustment of the vehicle at different driving speeds is realized by adjusting the size of the pump pressure. However, the pump is always in a working state regardless of whether the vehicle needs to steer, and thus consumes excessive energy. Moreover, the installation and debugging process of the hydraulic module is complex, and the assembly requirements are high. The hydraulic power-assisted system has a large noise, which affects the experience of the driver.

[0003] The traditional electric power-assisted steering system has a small transmission ratio, needs to be equipped with a larger power motor, and is adapted to a low-voltage platform, which needs a larger working current and thus has a lower efficiency. At the same time, due to the overall increase of the system, the vehicle occupies more layout space.

[0004] Therefore, it is necessary to invent an electric power-assisted steering bridge system suitable for forklifts to solve the above problems. SUMMARY

[0005] In view of the above problems, the present application provides an electric power-assisted steering bridge system suitable for forklifts to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: an electric power-assisted steering bridge system suitable for forklifts, comprising a bridge body, a motor arranged at the center of the bridge body, a reducer arranged on one side of the motor, and a motor output end connected with a reducer input end, wherein the motor is installed on the front shell of the speed reducer, both sides of the surface of the bridge body are provided with connecting rods, the output steering knuckle arm of the output end of the reducer is rotationally connected with the inner side end of the connecting rod, and the outer side end of the connecting rod is rotationally connected with one end of the steering knuckle arm, and the other end of the steering knuckle arm is connected with a hub.

[0007] A controller is installed on the top of the motor, and the motor and the controller are electrically connected, main pins are arranged at both ends of the bridge body, a torque sensor is installed on the main pin, and the torque sensor is signal connected with the controller.

[0008] Further, the reducer comprises a front shell and a rear shell, the front shell is installed on the top of the motor, the motor output end penetrates the bottom surface of the front shell, and the rear shell is correspondingly placed on the top of the front shell, a drive gear is arranged between the front shell and the rear shell, and the drive gear is connected with the motor output end.

[0009] Further, the front shell and the rear shell are provided with an idler wheel at the center, the top end and the bottom end of the idler wheel penetrating the rear shell and the front shell respectively, and the idler wheel is engaged with the driving gear.

[0010] Further, the front shell and the rear shell are further provided with a driven gear, the driven gear is engaged with the idler wheel, and the idler wheel is between the driving gear and the driven gear, and the top and the bottom of the center of the driven gear penetrating the rear shell and the front shell respectively.

[0011] Further, the reducer comprises a first planetary gear train and a second planetary gear train, the sun gear of the first planetary gear train is integrated on the driven gear, the first planetary gear train comprises a first planetary gear, the first fixed pin of the first planetary gear is sleeved with a first bearing at the center, and the first planetary gear is engaged with the driven gear.

[0012] Further, the front shell is provided with a ring gear at the bottom, the top opening of the ring gear is fixedly connected with the bottom surface of the front shell, and the bottom of the driven gear is at the top opening of the ring gear.

[0013] Further, the second planetary gear train comprises a second planetary gear and a second bearing, the second fixed pin of the second planetary gear is sleeved with a second bearing at the center, an end cover is fixed at the bottom opening of the ring gear, the end cover is fixed on the wheel shaft through the second fixed pin, the wheel shaft is fixed on the end cover through the bearing, and the second planetary gear is fixed on the wheel shaft through the second fixed pin in the second bearing.

[0014] Further, a planet carrier is arranged between the bottom of the driven gear and the wheel shaft, the first planetary gear is fixed on the planet carrier through the first fixed pin in the first bearing, and the planet carrier is installed at the center of the ring gear.

[0015] Further, the bottom of the wheel shaft at the center protrudes from the bottom of the end cover, and the bottom of the wheel shaft at the center is connected with an output steering knuckle arm.

[0016] Technical effects and advantages of the present application:

[0017] 1. The driving gear drives the driven gear through the idler wheel, the driven gear drives the first planetary gear due to the limitation of the ring gear and the planet carrier, the preliminary cooperation of the driving gear, the idler wheel and the driven gear and the speed reduction cooperation of the first planetary gear train and the second planetary gear train greatly simplify the space size of the steering system, which is beneficial to the space arrangement of the whole vehicle, the spline connection is saved by the limited cooperation of the wheel shaft and the end cover, the positioning accuracy is high, the spline transmission noise is reduced, and the loss is reduced.

[0018] 2. In the application, the wheel shaft is connected with the designed output steering arm as the power output of the reducer, the output steering arm rotates to drive the swing of the left and right connecting rods, one end of the steering arm is connected with the bridge body through the kingpin, and the other end is connected with the wheel hub, the swing of the left and right connecting rods makes the left and right steering of the left and right steering arms, so that the rotation is realized by overcoming the left and right wheel hub steering resistance moment, and through the optimization of the design of the output steering arm, the connecting rod and the steering arm, the maximum steering performance of the electric fork truck can be achieved.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A hydraulic power steering system diagram of the prior art is shown;

[0022] Figure 2 A whole structure diagram of an electric power steering bridge system suitable for fork truck use in the embodiment of the present application is shown;

[0023] Figure 3 A motor and reducer connection structure schematic diagram of the embodiment of the present application is shown;

[0024] In the figure: 1, bridge body; 100, steering bridge shell; 2, motor; 200, oil cylinder assembly; 3, reducer; 300, connecting rod; 301, front shell; 302, rear shell; 303, drive gear; 304, idler; 305, driven gear; 306, first planetary gear; 307, first bearing; 308, first fixed pin; 309, gear ring; 310, second planetary gear; 311, second bearing; 312, second fixed pin; 313, end cover; 314, wheel shaft; 315, planetary carrier; 4, support; 400, steering wheel hub; 5, connecting rod; 500, mounting bolt; 6, output steering arm; 7, steering arm; 8, wheel hub; 9, controller; 10, kingpin; 11, torque sensor. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] As shown in the prior art such as Figure 1 The prior art as shown in the prior art such as

[0027] The present application provides an electric power-assisted steering axle system suitable for use in a forklift, as shown in Figure 2As shown, including the bridge 1, the center of the bridge 1 is provided with motor 2, one side of the motor 2 is provided with a reducer 3, and the motor 2 output end and the reducer 3 input end are connected, the motor 2 is installed on the front shell 301 of the speed reducer 3, the surface of the bridge 1 is provided with a connecting rod 5 on both sides, the output steering knuckle arm 6 of the reducer 3 output end is rotatably connected with the inner side end of the connecting rod 5, and the outer side end of the connecting rod 5 is rotatably connected with one end of the steering knuckle arm 7, the other end of the steering knuckle arm 7 is connected with the wheel hub 8; The bracket 4 fixes the electric power steering system on the bridge 1, the motor 2 is responsible for providing power source, the controller 9 can be installed on the motor 2, or can be placed separately in the cab, to realize better protection. The controller 9 controls the motor 2 to drive on one hand, and can control the output torque and rotating speed of the motor 2 according to the signal of the torque sensor 11 on the other hand, the reducer 3 realizes speed reduction and torque increase, the output steering knuckle arm 6 converts the power of the reducer 3 from rotation to the swing of the connecting rod 5, and finally realizes the steering of the forklift through the wheel hub 8. The motor 2 is provided with a controller 9 on the top, and the motor 2 and the controller 9 are electrically connected, the bridge 1 is provided with a main pin 10 at both ends, the torque sensor 11 is installed on the main pin 10, and the torque sensor 11 and the controller 9 are signal connected. Among them, the model of the torque sensor 11 is set to ZJ-5A, the torque sensor 11 and the controller 9 are signal connected, the controller 9 controls the operation through the signal transmitted by the torque sensor 11, and the principle of automatic control technology in the prior art is the same, and the setting mode is known to the person skilled in the art. The electric drive system can realize accurate control of the steering angle and torque through the controller 9; The reducer 3 reduces the speed and increases the torque, reduces the performance requirement of the motor 2, adapts to the power supply system of the whole vehicle, and can reduce the overall cost of the forklift. The power source of the electric drive system comes from the power supply of the whole vehicle, which can work according to the demand of steering, and is more energy-saving and environment-friendly.

[0028] In Figure 3In the embodiment, the speed reducer 3 comprises a front shell 301 and a rear shell 302, the front shell 301 is mounted on the top of the motor 2, and the output end of the motor 2 penetrates through the bottom surface of the front shell 301, and the rear shell 302 is correspondingly placed on the top of the front shell 301, a drive gear 303 is arranged between the front shell 301 and the rear shell 302, and the drive gear 303 is connected with the output end of the motor 2. A idler gear 304 is arranged at the center of the front shell 301 and the rear shell 302, the top end and the bottom end of the idler gear 304 respectively penetrate through the rear shell 302 and the front shell 301, and the idler gear 304 is engaged with the drive gear 303. The front shell 301 and the rear shell 302 are also provided with a driven gear 305, the driven gear 305 is engaged with the idler gear 304, the idler gear 304 is between the drive gear 303 and the driven gear 305, and the top and the bottom of the center of the driven gear 305 respectively penetrate through the rear shell 302 and the front shell 301. The top surface of the front shell 301 and the bottom surface of the rear shell 302 are correspondingly attached, and the front shell 301 and the rear shell 302 cooperatively sequentially limit the drive gear 303, the idler gear 304 and the driven gear 305, respectively, and the drive gear 303 is drivingly connected with the driven gear 305 through the idler gear 304, and the idler gear 304 can increase the center distance between the motor 2 and the speed reducer 3, so as to provide sufficient installation space for the motor 2.

[0029] In Figure 3 In the embodiment, the speed reducer 3 comprises a first planetary gear train and a second planetary gear train, the sun gear of the first planetary gear train is integrated on the driven gear 305, the first planetary gear train comprises a first planetary gear 306, a first fixed pin 308 is sleeved on the center of the first planetary gear 306 through a first bearing 307, and the first planetary gear 306 is engaged with the driven gear 305. The drive gear 303 drives the driven gear 305 to rotate through the idler gear 304, and the driven gear 305 drives the first planetary gear 306 to rotate due to the limitation of the ring gear 309 and the planet carrier 315. The preliminary cooperation of the drive gear 303, the idler gear 304 and the driven gear 305 and the speed reduction cooperation of the first planetary gear train and the second planetary gear train greatly simplify the space size of the steering system, which is beneficial to the space arrangement of the whole vehicle.

[0030] In Figure 3 In the embodiment, the bottom of the front shell 301 is provided with a ring gear 309, the top opening of the ring gear 309 is fixedly connected with the bottom surface of the front shell 301, and the bottom of the driven gear 305 is located at the top opening of the ring gear 309. The ring gear 309 is designed as two internal gears, which are respectively matched with the first planetary gear 306 and the second planetary gear 310, and the ring gear 309 also serves as a part of the shell of the speed reducer 3, the top end opening of the ring gear 309 is connected with the front shell 301 of the speed reducer, and the bottom end opening of the ring gear 309 is connected with an end cover 313.

[0031] In Figure 3In the second planetary gear train, the second planetary gear 310 is sleeved with the second fixed pin 312 through the second bearing 311 at the center, the end cover 313 is fixed at the bottom opening of the gear ring 309, the end cover 313 is fixed on the wheel shaft 314 through the second fixed pin 312, the wheel shaft 314 is fixed on the end cover 313 through the bearing, and the second planetary gear 310 is fixed on the wheel shaft 314 through the second fixed pin 312 inside the second bearing 311. The planet carrier 315 is arranged between the bottom of the passive gear 305 and the wheel shaft 314, the first planetary gear 306 is fixed on the planet carrier 315 through the first fixed pin 308 inside the first bearing 307, and the planet carrier 315 is installed at the center of the gear ring 309. By using the limited cooperation of the wheel shaft 314 and the end cover 313, the spline connection is omitted, the positioning accuracy is high, the spline transmission noise is reduced, and the loss is reduced.

[0032] In Figure 2 and Figure 3 In the second planetary gear train, the second planetary gear 310 is sleeved with the second fixed pin 312 through the second bearing 311 at the center, the end cover 313 is fixed at the bottom opening of the gear ring 309, the end cover 313 is fixed on the wheel shaft 314 through the second fixed pin 312, the wheel shaft 314 is fixed on the end cover 313 through the bearing, and the second planetary gear 310 is fixed on the wheel shaft 314 through the second fixed pin 312 inside the second bearing 311. The planet carrier 315 is arranged between the bottom of the passive gear 305 and the wheel shaft 314, the first planetary gear 306 is fixed on the planet carrier 315 through the first fixed pin 308 inside the first bearing 307, and the planet carrier 315 is installed at the center of the gear ring 309. By using the limited cooperation of the wheel shaft 314 and the end cover 313, the spline connection is omitted, the positioning accuracy is high, the spline transmission noise is reduced, and the loss is reduced.

[0033] The working principle of the present application is as follows:

[0034] Referring to the drawings in the specification Figures 2-3 The bracket 4 fixes the electric steering system on the bridge body 1, the motor 2 is responsible for providing a power source, the controller 9 can be installed on the motor 2 or separately placed in the cab to achieve better protection. The controller 9 controls the motor 2 to drive on one hand, and controls the output torque and speed of the motor 2 according to the signal of the torque sensor 11 on the other hand, the reducer 3 realizes speed reduction and torque increase, the output knuckle arm 6 converts the power of the reducer 3 from rotation to swing of the connecting rod 5, and finally realizes the steering of the forklift through the wheel hub 8.

[0035] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric power assisted steering bridge system suitable for use with a fork lift truck comprising a bridge body (1) characterised in that: The center of the bridge (1) is provided with a motor (2), one side of the motor (2) is provided with a speed reducer (3), and the output end of the motor (2) is connected with the input end of the speed reducer (3), the motor (2) is installed on the front shell (301) of the speed reducer (3), both sides of the surface of the bridge (1) are provided with connecting rods (5), the output steering knuckle arm (6) of the output end of the speed reducer (3) is rotatably connected with the inner side end of the connecting rod (5), and the outer side end of the connecting rod (5) is rotatably connected with one end of the steering knuckle arm (7), the other end of the steering knuckle arm (7) is connected with the hub (8); The top of the motor (2) is provided with a controller (9), and the motor (2) is electrically connected with the controller (9), both ends of the bridge (1) are provided with kingpins (10), the kingpins (10) are provided with torque sensors (11), and the torque sensors (11) are signal connected with the controller (9); The speed reducer (3) comprises a front shell (301) and a rear shell (302), the front shell (301) is installed on the top of the motor (2), the output end of the motor (2) penetrates the bottom surface of the front shell (301), and the rear shell (302) is correspondingly placed on the top of the front shell (301), a drive gear (303) is arranged between the front shell (301) and the rear shell (302), and the drive gear (303) is connected with the output end of the motor (2); The center of the front shell (301) and the rear shell (302) is provided with an idler gear (304), the top end and the bottom end of the center of the idler gear (304) penetrate the rear shell (302) and the front shell (301) respectively, and the idler gear (304) is engaged with the drive gear (303); The front shell (301) and the rear shell (302) are also provided with a driven gear (305), the driven gear (305) is engaged with the idler gear (304), and the idler gear (304) is between the drive gear (303) and the driven gear (305), the top and the bottom of the center of the driven gear (305) penetrate the rear shell (302) and the front shell (301) respectively; The speed reducer (3) comprises a first planetary gear train and a second planetary gear train, a sun gear of the first planetary gear train is integrated on the driven gear (305), the first planetary gear train comprises a first planetary gear (306), a first fixed pin (308) is sleeved on the first planetary gear (306) at the center thereof through a first bearing (307), and the first planetary gear (306) is engaged with the driven gear (305); The bottom of the front shell (301) is provided with a gear ring (309), the top opening of the gear ring (309) is fixedly connected with the bottom surface of the front shell (301), and the bottom of the driven gear (305) is located at the top opening of the gear ring (309). The second planetary gear system comprises a second planetary gear (310) and a second bearing (311), the second planetary gear (310) is sleeved with a second fixing pin (312) through the second bearing (311) at the center, the end cover (313) is fixed at the bottom opening of the ring gear (309), the second planetary gear (310) is fixed on the wheel shaft (314) through the second fixing pin (312), the wheel shaft (314) is fixed on the end cover (313) by using a bearing, and the second planetary gear (310) is fixed on the wheel shaft (314) through the second fixing pin (312) inside the second bearing (311); The wheel shaft (314) extends out of the bottom of the end cover (313) at the center, and the bottom at the center of the wheel shaft (314) is connected with the output knuckle arm (6).

2. The electric power assisted steering axle system suitable for forklifts according to claim 1, characterized in that: The planetary carrier (315) is arranged between the bottom of the passive gear (305) and the wheel shaft (314), the first planetary gear (306) is fixed on the planetary carrier (315) through the first fixing pin (308) inside the first bearing (307), and the planetary carrier (315) is installed at the center of the ring gear (309).

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