Steering transmission device with four universal joints

Abstract

The utility model discloses a four-universal-joint steering transmission device which is arranged on a vehicle body and used for transmitting rotation of a steering wheel to a steering gear box and comprises an angle steering gear installed at the front lower position of the vehicle body, the upper end of the angle steering gear is connected with a second transmission shaft, and the rear end of the angle steering gear is connected with a third transmission shaft. A first transmission shaft is arranged between the rotating shaft of the steering wheel and the second transmission shaft, and a first universal joint and a second universal joint are respectively arranged between the rotating shaft of the steering wheel and the second transmission shaft and the first transmission shaft; a fourth transmission shaft is arranged between the input shaft of the steering gear box and the third transmission shaft, and a third universal joint and a fourth universal joint are arranged between the third transmission shaft and the fourth transmission shaft and between the input shaft of the steering gear box and the fourth transmission shaft respectively. According to the utility model, the low-floor arrangement is realized, the steering transmission from the steering wheel to the steering gear box is finally realized by only adopting four universal joints, the structure is simple, and the use is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of steering transmission, in particular to a steering transmission device with four universal joints. Background Art

[0002] A steering transmission device is a device that transmits the rotation at the steering wheel to the steering gear in a vehicle to assist in steering control. In a light truck, the front wheels that need steering control are located at the rear of the cab, and the steering gear is located at the lower rear position of the steering wheel. As Figure 5 shown, the steering transmission requires the steering transmission device to have a large steering angle. In the prior art, although a universal joint structure is arranged to adapt to the change of the transmission angle, the universal joint is a mechanical part with unequal instantaneous speed and equal average speed. When the angle between the axes at both ends of the universal joint is less than 150°, obvious torque fluctuations will occur. To reduce the above torque fluctuation changes during actual use, the angle between the axes at both ends of the universal joint should usually be greater than 150°, but this will increase the difficulty of simplifying the structure and ensuring the stable use of the steering transmission device. In addition, at present, for the convenience of getting into the vehicle in one step, the cab position is mostly designed with a low floor, and the steering transmission device also needs to be connected to the steering gear through the lower bottom of the vehicle body. To sum up, the steering transmission device needs to be further improved. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a steering transmission device with four universal joints that can achieve low-floor layout, has a simple structure and stable use.

[0004] To solve the above technical problem, the technical solution of the utility model is: a steering transmission device with four universal joints, which is arranged on the vehicle body and used to transmit the rotation of the steering wheel to the steering gear, including an angular steering gear installed at the front lower position of the vehicle body, a second transmission shaft is connected to the upper end of the angular steering gear and a third transmission shaft is connected to the rear end, a first transmission shaft is arranged between the rotating shaft of the steering wheel and the second transmission shaft, and a first universal joint and a second universal joint are respectively arranged between the rotating shaft of the steering wheel, the second transmission shaft and the first transmission shaft; a fourth transmission shaft is arranged between the input shaft of the steering gear and the third transmission shaft, and a third universal joint and a fourth universal joint are respectively arranged between the third transmission shaft, the input shaft of the steering gear and the fourth transmission shaft.

[0005] As a preferred technical solution, the fourth transmission shaft is a sliding key type transmission shaft.

[0006] As a preferred technical solution, a bearing seat for stabilizing the third transmission shaft is arranged at the bottom of the vehicle body.

[0007] As a preferred technical solution, the angle steering gear includes an angle steering housing, on which the second drive shaft extending upward and the third drive shaft extending backward are rotatably installed. An active bevel gear is fixedly installed at the inner end of the second drive shaft, and a driven bevel gear is fixedly installed at the inner end of the third drive shaft. The active bevel gear and the driven bevel gear are constantly meshed.

[0008] As a preferred technical solution, the first drive shaft is a sliding key type drive shaft.

[0009] Due to the adoption of the above technical solution, a steering transmission device with four universal joints is arranged on the vehicle body and is used to transmit the rotation of the steering wheel to the steering gear. It includes an angle steering gear installed at the front lower position of the vehicle body. The upper end of the angle steering gear is connected to the second drive shaft and the rear end is connected to the third drive shaft. A first drive shaft is arranged between the rotating shaft of the steering wheel and the second drive shaft. A first universal joint and a second universal joint are respectively arranged between the rotating shaft of the steering wheel, the second drive shaft and the first drive shaft; a fourth drive shaft is arranged between the input shaft of the steering gear and the third drive shaft. A third universal joint and a fourth universal joint are respectively arranged between the third drive shaft, the input shaft of the steering gear and the fourth drive shaft. The present utility model sets the angle steering gear at the front lower position of the vehicle body for 90° angle steering. Two universal joints are adopted at the upper end to form a transmission connection with the rotating shaft of the steering wheel, and two universal joints are adopted at the rear end to form a transmission connection with the input shaft of the steering gear under the vehicle body, realizing a low-floor layout. And finally, only four universal joints are used to achieve the steering transmission from the steering wheel to the steering gear, with a simple structure and stable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:

[0011] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0012] Figure 2 is Figure 1 the A-A structural schematic diagram of

[0013] Figure 3 is a structural principle diagram of the angle steering gear in an embodiment of the present utility model;

[0014] Figure 4 is a layout principle diagram when the embodiment of the present utility model is used on the vehicle body;

[0015] Figure 5 is a structural principle diagram of an existing low-floor vehicle body and the steering wheel and steering gear thereon.

[0016] In the figure: 1 - vehicle body; 2 - steering wheel; 3 - steering gear; 4 - angle steering gear; 41 - driving bevel gear; 42 - driven bevel gear; 51 - first transmission shaft; 52 - second transmission shaft; 53 - third transmission shaft; 54 - fourth transmission shaft; 61 - first universal joint; 62 - second universal joint; 63 - third universal joint; 64 - fourth universal joint; 7 - bearing housing. Detailed implementation mode

[0017] The present utility model will be further elaborated below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is beyond doubt that those of ordinary skill in the art can recognize that, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0018] As Figures 1 to 4 As commonly shown, a steering transmission device with four universal joints is arranged on the vehicle body 1 and is used to transmit the rotation of the steering wheel 2 to the steering gear 3. Of course, the steering wheel 2 is installed in the vehicle body 1 through a rotating shaft, and the steering gear 3 is located below the vehicle body 1 and in the lower rear direction of the steering wheel 2. Among them, the "front" and "rear" orientations involved in this embodiment are defined according to the front and rear orientations of a conventional vehicle to more clearly illustrate the structure of this embodiment in line with conventional cognition.

[0019] This device includes an angle steering gear 4 installed at the front lower position of the vehicle body 1. The upper end of the angle steering gear 4 is connected with a second transmission shaft 52 and the rear end is connected with a third transmission shaft 53. The angle steering gear 4 includes an angle steering housing. The second transmission shaft 52 extending upward and the third transmission shaft 53 extending backward are rotatably installed on the angle steering housing. The inner end of the second transmission shaft 52 is fixedly installed with a driving bevel gear 41, and the inner end of the third transmission shaft 53 is fixedly installed with a driven bevel gear 42. The driving bevel gear 41 and the driven bevel gear 42 are always meshed. The angle steering gear 4 realizes a 90° angle steering of the transmission direction through bevel gear transmission.

[0020] A first transmission shaft 51 is provided between the rotating shaft of the steering wheel 2 and the second transmission shaft 52. A first universal joint 61 and a second universal joint 62 are respectively provided between the rotating shaft of the steering wheel 2, the second transmission shaft 52 and the first transmission shaft 51. Through the connection of the first transmission shaft 51 and the first universal joint 61 and the second universal joint 62, the rotation of the steering wheel 2 can be transmitted to the angle steering gear 4. And because only two universal joints are provided, the axis angle at each universal joint is easily more than 150°, the torque fluctuation is small, and the use is stable.

[0021] The third transmission shaft 53 extends rearward below the vehicle body 1. A fourth transmission shaft 54 is provided between the input shaft of the steering gear 3 and the third transmission shaft 53. A third universal joint 63 and a fourth universal joint 64 are respectively provided between the third transmission shaft 53, the input shaft of the steering gear 3 and the fourth transmission shaft 54. The third transmission shaft 53 extending rearward and laterally uses the fourth transmission shaft 54 and the third universal joint 63 and the fourth universal joint 64 to achieve connection with the steering gear 3 after bypassing the low-floor vehicle body 1. The axis angles at the two universal joints are also easily exceeded 150°, and the torque fluctuation is small. Thus, between the steering wheel 2 and the steering gear 3 at the lower rear, the steering transmission purpose is achieved through four universal joints, with a simple structure and stable use.

[0022] Preferably, a bearing seat 7 for stabilizing the third transmission shaft 53 is provided at the bottom of the vehicle body 1. The third transmission shaft 53 connected to the diagonal steering gear 4 is radially stabilized through the bearing seat 7, further improving the stability of rearward transmission.

[0023] Preferably, the fourth transmission shaft 54 is a sliding key type transmission shaft. With this sliding key type transmission shaft, while realizing rotational transmission, it is convenient to adapt to the movement of the steering gear 3 caused by the bump of the vehicle body 1, ensuring stable transmission and facilitating maintenance. The sliding key type transmission shaft is a split type transmission shaft structure formed by a spline sleeve and a spline shaft with only axial relative movement freedom, which is a commonly used technology in this field and will not be elaborated here.

[0024] Preferably, the first transmission shaft 51 is a sliding key type transmission shaft to facilitate the angle adjustment of the steering wheel 2 while realizing rotational transmission.

[0025] In this embodiment, the diagonal steering gear 4 is provided at the front lower position of the vehicle body 1 for 90° angle steering. Two universal joints are used at the upper end to form a transmission connection with the rotating shaft of the steering wheel 2, and two universal joints are used at the rear end to form a transmission connection with the input shaft of the steering gear 3 below the vehicle body 1, realizing a low-floor layout. And finally, only four universal joints are used to achieve the steering transmission from the steering wheel 2 to the steering gear 3, with a simple structure and stable use.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A four-cardan steering transmission device, which is arranged on a vehicle body and is used to transmit the rotation of a steering wheel to a steering gear, characterized in that: It includes an angle steering gear installed at the front lower position of the vehicle body, the upper end of the angle steering gear is connected to the second transmission shaft and the rear end is connected to the third transmission shaft, a first transmission shaft is arranged between the rotating shaft of the steering wheel and the second transmission shaft, a first universal joint and a second universal joint are arranged between the rotating shaft of the steering wheel, the second transmission shaft and the first transmission shaft respectively; a fourth transmission shaft is arranged between the input shaft of the steering machine and the third transmission shaft, a third universal joint and a fourth universal joint are arranged between the third transmission shaft, the input shaft of the steering machine and the fourth transmission shaft respectively.

2. A four-universal-joint steering transmission device as claimed in claim 1, characterized in that: The fourth transmission shaft is a sliding key type transmission shaft.

3. A four-universal-joint steering transmission device as claimed in claim 1, characterized in that: A bearing seat for stabilizing the third transmission shaft is provided at the bottom of the vehicle body.

4. A four-universal-joint steering transmission device as claimed in claim 1, characterized in that: The angular steering gear includes an angular steering housing, on which the second transmission shaft extending upward and the third transmission shaft extending backward are rotatably mounted, the inner end of the second transmission shaft is fixedly mounted with a driving bevel gear, the inner end of the third transmission shaft is fixedly mounted with a driven bevel gear, and the driving bevel gear and the driven bevel gear are often meshed.

5. A four-universal-joint steering transmission device as claimed in claim 1, characterized in that: The first transmission shaft is a sliding key type transmission shaft.

Images