Flexible four-wheel steering structure
By introducing a gas spring into the four-wheel steering structure, the rotation of the rear wheel is softened, and the shaking problem caused by uneven force on the rear wheel is solved, and the comfort of the driving experience is improved.
Patent Information
- Application Number
- CN202420410464.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-03-04
AI Technical Summary
When the existing four-wheel steering structure is driving on a bumpy road, the rear wheels are subjected to uneven force, resulting in constant shaking and affecting the driving experience.
A flexible four-wheel steering structure is designed. By installing a gas spring on the rear steering arm, the flexible rotation of the rear wheel is achieved, and the front wheel is driven to rotate through the front steering arm to realize the function of four-wheel steering.
During driving, the gas spring can offset the impact force when the rear wheel is unevenly subjected to stress, reduce the vibration transmitted by the front steering arm, and improve driving comfort.
Smart Images
Figure CN222804454U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of four-wheel steering, in particular to a flexible four-wheel steering structure. Background Art
[0002] Wheelchairs are important tools for rehabilitation. They are not only a means of transportation for people with physical disabilities, but more importantly, they can use wheelchairs to exercise and participate in social activities. With the development of the times, in order to better serve people with physical disabilities, many manufacturers have improved wheelchairs, some of which have added improvements to the mechanism, and some have added functional modules, such as voice control, induction, etc. Electric wheelchairs and combined wheelchairs have also become a new research hotspot.
[0003] Manual wheelchairs are mostly used by patients, disabled people and the elderly, and are usually pushed by caregivers or moved by the users themselves, which is particularly inconvenient for users to travel long distances alone. Therefore, a rideable wheelchair has appeared on the market. The rideable wheelchair consists of a front part and a wheelchair. The front part and the wheelchair are detachably connected together through a connecting structure, realizing the electric ride function of the manual wheelchair.
[0004] The steering structure is an important component of a rideable wheelchair. Generally, the four-wheel steering structure is rigidly connected. So when the rideable wheelchair is driving on a bumpy road, the force on the left and right rear wheels is generally uneven, which will cause constant shaking and make the driving experience poor. Utility Model Content
[0005] In order to solve the above technical problems, the utility model discloses a flexible four-wheel steering structure, which specifically includes a frame, wherein front and rear wheel parts are arranged at the front and rear of the frame, a front steering arm is arranged on the head tube at the front of the frame, the front steering arm is connected to the two front wheels through two pull rods, and a rear steering arm is also arranged on the frame, and the rear steering arm is connected to the rear wheel part through a gas spring; the front steering arm and the rear steering arm are connected by bolts, and a groove is arranged on the part of the front steering arm connected to the rear steering arm, and a connecting bolt is arranged in the groove, and the bolt moves freely in the groove of the front steering arm; the connection between the front steering arm and the frame is bolted, and the front steering arm can rotate 360° around the bolt; the rear steering arm is connected to the gas spring by bolts, and the rear steering arm can rotate 360° around the bolt; the gas spring is connected to the rear wheel part by bolts, and the rear wheel part can rotate 360° around the bolt.
[0006] The beneficial effects of the utility model are as follows: the utility model drives the left and right front wheels and part of the rear wheels to rotate by rotating the front steering arm. Unlike the general four-wheel steering, an air spring is installed on the rear steering arm, which can not only realize the function of four-wheel steering, but also has a force unloading effect if the rear wheels encounter a bumpy road surface during driving, thereby increasing comfort. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a structural schematic diagram of the utility model.
[0008] Figure 2 It is a schematic diagram of the exploded structure of each part of the utility model.
[0009] Figure 3 It is a schematic diagram of the rotation of various parts of the utility model.
[0010] Figure 4 It is a schematic diagram of the utility model for offsetting impact force.
[0011] In the figure, 1-front steering arm, 2-tie rod, 3-front wheel, 4-frame, 5-rear steering arm, 6-gas spring, 7-rear wheel part. DETAILED DESCRIPTION
[0012] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.
[0013] Example: Figure 1 and Figure 2 As shown, a flexible four-wheel steering structure specifically includes a frame 4, and a front wheel 3 and a rear wheel part 7 are arranged at the front and rear of the frame 4. A front steering arm is arranged on the head tube at the front of the frame 4, and the front steering arm 1 is connected to the two front wheels 3 through two pull rods 2. A rear steering arm 5 is also arranged on the frame 4, and the rear steering arm 5 is connected to the rear wheel part 7 through a gas spring 6; the front steering arm 1 and the rear steering arm 5 are connected by bolts, and a groove is arranged on the part of the front steering arm 1 connected to the rear steering arm 5, and a connecting bolt is arranged in the groove, and the bolt moves freely in the groove of the front steering arm 1; the connection between the front steering arm 1 and the frame 4 is bolted, and the front steering arm 1 can rotate 360° around the bolt; the rear steering arm 5 is connected to the gas spring 6 by bolts, and the rear steering arm 5 can rotate 360° around the bolt; the gas spring 6 is connected to the rear wheel part 7 by bolts, and the rear wheel part 7 can rotate 360° around the bolt.
[0014] like Figure 3 and Figure 4As shown, the front steering arm 1 is installed on the head tube of the frame 4 and can rotate around point A; the front wheels 3 are installed on both sides of the front part of the frame 4 and can rotate around D and D1 respectively; the left and right front wheels 3 are connected to the front steering arm 1 through the front pull rod 2, so by rotating the front steering arm 1, the left and right front wheels 3 can be driven to rotate, thereby realizing the steering function of the front wheels 3; the rear steering arm 5 is installed on the frame 4 and can rotate around point O; the rear wheel part 7 is installed on the frame 4 and can rotate around point O1; the rear wheel part 7 is connected to the rear steering arm 5 through the gas spring 6, and the gas spring 6 can be extended or shortened; the rear steering arm 5 and the front steering arm 1 are installed in a groove, and the slider of the rear steering arm 5 can slide in the groove of the front steering arm 1, so rotating the front steering arm 1 drives the rear steering arm 5 to rotate, and at the same time drives the rear wheel to rotate through the gas spring 6, thereby realizing the rear wheel steering function.
[0015] When the forces on both sides of the rear wheel part 7 are uneven, the gas spring 6 offsets the impact force by extending or shortening, thereby reducing the vibration transmitted to the handlebar by the front steering arm 1.
[0016] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A flexible four-wheel steering structure, characterized in that: The vehicle comprises a frame, wherein front and rear wheel parts are arranged at the front and rear of the frame, a front steering arm is arranged on the head pipe at the front of the frame, and the front steering arm is connected to the two front wheels through two tie rods, and a rear steering arm is also arranged on the frame, and the rear steering arm is connected to the rear wheel part through a gas spring.
2. The flexible four-wheel steering structure according to claim 1, characterized in that: The front steering arm and the rear steering arm are connected by bolts. A groove is provided on the portion of the front steering arm connected to the rear steering arm. A connecting bolt is provided in the groove. The bolt can move freely in the groove of the front steering arm.
3. The flexible four-wheel steering structure according to claim 2, characterized in that: The front steering arm is connected to the vehicle frame by bolts, and the front steering arm can rotate 360° around the bolts.
4. The flexible four-wheel steering structure according to claim 3, characterized in that: The rear steering arm is connected to the gas spring via bolts, and the rear steering arm can rotate 360 degrees around the bolts.
5. The flexible four-wheel steering structure according to claim 4, characterized in that: The gas spring is connected to the rear wheel part through bolts, and the rear wheel part can rotate 360 degrees around the bolts.