A rear wheel suspension mechanism for an unmanned flow vehicle

Abstract

This utility model relates to the field of unmanned logistics vehicle technology, specifically a rear wheel suspension mechanism for an unmanned logistics vehicle, including a chassis and a rear wheel assembly. The chassis includes symmetrically arranged longitudinal beams, and a front crossbeam, a first intermediate crossbeam, a second intermediate crossbeam, and a rear crossbeam arranged parallel to each other between the two longitudinal beams. The second intermediate crossbeam and the rear crossbeam form a rear wheel support portion. The outer surfaces of the two longitudinal beams corresponding to the second intermediate crossbeam are symmetrically provided with rear spring front supports, and the outer surfaces of the two longitudinal beams corresponding to the rear crossbeam are symmetrically provided with rear spring rear supports. The rear wheel assembly is elastically connected to the rear spring front supports and the rear spring rear supports. This mechanism has a simplified structure, convenient assembly and maintenance, strong stability, and efficient power integration, effectively improving the heavy-load adaptability and operational safety of unmanned logistics vehicles.

Description

Technical Field

[0001] This utility model relates to the field of unmanned logistics vehicle technology, and in particular to a rear wheel suspension mechanism for unmanned logistics vehicles. Background Technology

[0002] The rear suspension is a core power-bearing component of the chassis of unmanned logistics vehicles, and its performance directly determines the vehicle's power transmission efficiency, load-bearing capacity, driving stability, and operational safety. Existing rear suspension mechanisms for unmanned logistics vehicles suffer from core problems such as complex structure, difficulty in assembly and maintenance, and poor stability.

[0003] Traditional rear-wheel suspensions separate the elastic elements from the guiding mechanism, requiring separate components such as springs, control arms, and steering knuckles. This results in a large number of parts, a cumbersome assembly process, and inefficient maintenance due to the need to disassemble multiple related components. Furthermore, the integration of the power drive unit with the suspension structure is low, with motors and reducers often independently arranged. This fragmented layout leads to low space utilization, long power transmission paths, and poor transmission efficiency. Insufficient rigidity in the rear wheel support makes it difficult to effectively dampen vibrations from road bumps, causing vehicle swaying and affecting driving stability. These issues collectively limit the operational efficiency and safety reliability of unmanned logistics vehicles.

[0004] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the problems of the prior art and provide a rear wheel suspension mechanism for unmanned logistics vehicles, which solves the technical problems of complex structure, inconvenient assembly and maintenance, poor stability, low power integration and lack of failure protection of the rear wheel suspension of unmanned logistics vehicles.

[0006] The above objectives are achieved through the following technical solutions: A rear wheel suspension mechanism for an unmanned logistics vehicle includes a chassis and a rear wheel assembly. The chassis includes longitudinal beams symmetrically arranged on the left and right, and a front crossbeam, a first intermediate crossbeam, a second intermediate crossbeam, and a rear crossbeam arranged parallel to each other between the two longitudinal beams. The second intermediate crossbeam and the rear crossbeam form a rear wheel support portion. The outer surfaces of the two longitudinal beams corresponding to the second intermediate crossbeam are symmetrically provided with rear spring front brackets, and the outer surfaces of the two longitudinal beams corresponding to the rear crossbeam are symmetrically provided with rear spring rear brackets. The rear wheel assembly is elastically connected to the rear spring front brackets and the rear spring rear brackets.

[0007] Furthermore, the rear wheel assembly includes an elastic support member composed of several stacked leaf springs, with both ends of the elastic support member hinged to the front bracket of the rear spring and the rear bracket of the rear spring, respectively.

[0008] Furthermore, the middle section of the elastic support member is provided with a rear wheel axle sleeve fixing seat, and the two rear wheel axle sleeve fixing seats are respectively fixed to the rear wheel axle sleeve. The rear wheel axle is movably connected inside the rear wheel axle sleeve, and the two ends of the rear wheel axle extend out of the rear wheel axle sleeve and are respectively connected to the two rear wheel modules.

[0009] Furthermore, a motor bracket is provided on the outer wall of the rear wheel axle sleeve, and a motor is provided on the motor bracket. The motor is connected to the rear wheel axle via a reducer.

[0010] Furthermore, a rear wheel assembly support beam is provided between the second intermediate crossbeam and the tail end crossbeam, and the two ends of the rear wheel assembly support beam are respectively fixed to the inner walls of the two longitudinal beams.

[0011] Furthermore, the rear wheel assembly support beam is symmetrically provided with upper shock absorber brackets, and the outer wall of the rear wheel axle sleeve is provided with a lower shock absorber bracket corresponding to the upper shock absorber bracket. One end of the shock absorber is hinged to the upper shock absorber bracket, and the other end is hinged to the lower shock absorber bracket.

[0012] Furthermore, the rear wheel axle sleeve is provided with a rear wheel longitudinal limiting seat at the position corresponding to the longitudinal beam, and the bottom surface of the longitudinal beam is provided with a rear wheel longitudinal limiting post corresponding to the position of the rear wheel longitudinal limiting seat.

[0013] Furthermore, the contact surface of the rear wheel longitudinal limiting seat is provided with a rubber buffer pad, and the rear wheel longitudinal limiting seat and the rear wheel longitudinal limiting post are arranged vertically in correspondence.

[0014] Furthermore, adjacent leaf springs are fixed together by clamps, and the rear wheel axle is connected to the inner wall of the rear wheel axle sleeve by a bearing.

[0015] Furthermore, the motor and the reducer are integrated into one unit, and the reducer is connected to the rear wheel shaft via gears.

[0016] The rear wheel suspension mechanism for unmanned logistics vehicles provided by this utility model simplifies the structure and makes maintenance convenient through the integrated design of leaf springs, achieves efficient power transmission through the integrated layout of motor and reducer, ensures driving stability through the support beam and double shock absorption, and provides safety protection through the limit mechanism, making it suitable for heavy loads and complex road conditions. Attached Figure Description

[0017] Figure 1 This is a top view of a rear wheel suspension mechanism for an unmanned logistics vehicle according to the present invention. Figure 2 This is a bottom view of a rear wheel suspension mechanism for an unmanned logistics vehicle according to the present invention. Figure 3This is a side view of a rear wheel suspension mechanism for an unmanned logistics vehicle according to the present invention. Figure 4 This is a perspective view of a rear wheel suspension mechanism for an unmanned logistics vehicle according to the present invention.

[0018] Illustration markings: 1-Chassis, 101-Longitudinal beam, 102-Front end crossbeam, 103-First intermediate crossbeam, 104-Second intermediate crossbeam, 105-Rear end crossbeam, 106-Rear wheel support section, 107-Rear wheel assembly support crossbeam; 2-Rear wheel assembly, 201-Leaf spring, 202-Elastic support component, 203-Rear wheel axle sleeve, 204-Rear wheel module; 3-Rear spring front bracket; 4-Rear spring and rear bracket; 5- Rear wheel axle sleeve fixing seat; 6-Motor bracket; 7-Motor; 8-Reducer; 9-Shock-absorbing upper bracket; 10-Shock-absorbing lower support; 11-Shock absorber; 12-Rear wheel longitudinal limit seat; 13 - Rear wheel longitudinal limit post. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] like Figures 1-4 As shown, this solution provides a rear wheel suspension mechanism for unmanned logistics vehicles. The mechanism consists of a chassis 1, a rear wheel assembly 2, a front rear spring bracket 3, a rear rear spring bracket 4, a rear wheel axle sleeve fixing seat 5, a motor bracket 6, a motor 7, a reducer 8, an upper shock absorber bracket 9, a lower shock absorber bracket 10, a shock absorber 11, a rear wheel longitudinal limiting seat 12, and a rear wheel longitudinal limiting post 13. The components work together to achieve elastic support, power drive, efficient shock absorption, and safety protection functions.

[0021] like Figure 1 , 2As shown in Figure 4, the chassis 1 is the core support foundation of the suspension mechanism, and is welded from high-strength steel to ensure overall rigidity and load-bearing capacity. It includes two longitudinal beams 101 arranged symmetrically on the left and right sides. The longitudinal beams 101 extend along the vehicle's driving direction and have a U-shaped cross-section, which can effectively distribute longitudinal and lateral forces. Four transverse beams are arranged parallel between the two longitudinal beams 101: a front transverse beam 102, a first intermediate transverse beam 103, a second intermediate transverse beam 104, and a rear transverse beam 105. Each transverse beam is made of high-strength steel that is compatible with the longitudinal beams 101, and both ends are fixedly connected to the longitudinal beams 101 by a full welding process, forming a rigid frame structure of "two longitudinal and four transverse" which can meet the heavy-load transportation needs of unmanned logistics vehicles.

[0022] The second intermediate crossbeam 104 and the two longitudinal beams 101 corresponding to the tail end crossbeam 105 form the rear wheel support part 106. The size of this area is precisely designed according to the installation size and movement trajectory of the rear wheel assembly 2 to ensure that there is no interference when the rear wheel rotates and the vibration is buffered. The rear spring front bracket 3 is fixed to the outer side of the two longitudinal beams 101 corresponding to the second intermediate crossbeam 104 by welding. The rear spring rear bracket 4 is symmetrically welded to the outer side of the two longitudinal beams 101 corresponding to the tail end crossbeam 105. Both the rear spring front bracket 3 and the rear spring rear bracket 4 are made of thickened steel plate and have hinge holes on the surface. The inner wall of the hole is provided with wear-resistant bushings for hinged connection with the elastic support 202 to improve the connection stability and service life.

[0023] In this embodiment, the rear wheel assembly 2 is the core component for achieving elastic buffering, power transmission, and load bearing. It includes an elastic support 202, a rear wheel axle sleeve 203, a rear wheel axle, and a rear wheel module 204. Specifically: like Figure 4 As shown, the elastic support 202 is composed of several stacked leaf springs 201. The leaf springs 201 are made of high-strength spring steel and processed by hot forming, possessing excellent elastic recovery capability and load-bearing strength. Adjacent leaf springs 201 are fixed together by clamps to prevent relative sliding. The two ends of the elastic support 202 are hinged to the front support 3 and the rear support 4 of the rear spring respectively by pins, achieving elastic buffering while also having a guiding function, simplifying the independent guiding mechanism of the traditional suspension and reducing the number of parts. Specifically, a leaf spring lug is also provided between the rear support 4 of the rear spring and the leaf spring 201. The leaf spring lug is used to limit the trajectory of the leaf spring 201 after deformation when the load on the leaf spring 201 changes. The rear wheel axle sleeve fixing seat 5 is made of cast steel. Specifically, it is screwed to the middle section of the elastic support 202 by U-bolts and leaf spring pressure plate. The two fixing seats are symmetrically arranged, and the spacing is adapted to the length of the rear wheel axle sleeve 203. The fixing seat is provided with reinforcing ribs to ensure the connection strength with the rear wheel axle sleeve 203 and avoid deformation during power transmission. The rear wheel axle sleeve 203 is made of seamless steel pipe and has a bearing mounting groove on the inner wall. It is movably connected to the rear wheel axle through the bearing, so that the rear wheel axle can rotate freely relative to the rear wheel axle sleeve 203. The bearing is a double row ball bearing, which has the characteristics of low friction and high load-bearing capacity, ensuring smooth rotation. The rear wheel module 204 is connected to both ends of the rear wheel axle by splines, which is a strong connection and easy to disassemble. The rear wheel module 204 can be equipped with a drum brake system to meet the braking requirements of unmanned logistics vehicles. Its rim size is suitable for heavy-duty scenarios, and the tires are made of wear-resistant rubber material to improve driving stability and service life.

[0024] like Figure 1 , 2 As shown in Figure 4, to achieve integrated power drive and suspension structure, a motor bracket 6 is welded and fixed to the outer wall of the rear wheel axle sleeve 203. The motor bracket 6 is made of welded steel plate with positioning pins and bolt holes on the surface to ensure the coaxiality of the motor 7 installation. The motor 7 and the reducer 8 are integrally formed and fastened to the motor bracket 6 with bolts, which is stable and saves space. The output end of the reducer 8 is connected to the rear wheel axle through gear transmission. The gear is made of high-strength alloy steel and is carburized and quenched, with high tooth surface precision and excellent transmission efficiency. It can smoothly transmit the power of the motor 7 to the rear wheel axle, thereby driving the rear wheel module 204 to rotate and realize vehicle movement.

[0025] It should be noted that the transmission connection between the motor 7 and the rear wheel axle via the reducer 8 is a gear drive, which is common knowledge in the field and will not be described in detail here.

[0026] like Figure 1 and 4 As shown, in order to enhance the overall rigidity of the rear wheel support 106, a rear wheel assembly support beam 107 is welded and fixed between the second intermediate crossbeam 104 and the tail end crossbeam 105. The crossbeam is a round tube beam, and both ends are screwed to the inner wall of the longitudinal beam 101 to form a stable structure. It can effectively resist the lateral force and torque during driving, avoid deformation of the longitudinal beam 101, ensure that the rear wheel assembly 2 is installed firmly, and improve the overall structural stability.

[0027] like Figure 4As shown, to further attenuate the vibration transmitted by road bumps, upper shock absorber brackets 9 are symmetrically welded onto the rear wheel assembly support beam 107, and lower shock absorber brackets 10 corresponding to the upper shock absorber brackets 9 are welded onto the outer wall of the rear wheel axle sleeve 203. Both brackets are made of thickened steel plates with hinge holes on their surfaces. The two ends of the shock absorber 11 are hinged to the upper shock absorber bracket 9 and the lower shock absorber bracket 10 respectively through pins. Lubricating grease is provided at the pins to ensure smooth extension and retraction of the shock absorber 11. The shock absorber 11 is a hydraulic shock absorber with non-adjustable damping. It can adjust the damping effect according to different working conditions such as no-load and heavy-load. Together with the leaf spring 201, it forms a dual damping system, effectively attenuating road bump vibrations, reducing the impact of vibration on the chassis 1 and the load-bearing materials, and improving the ride comfort of the vehicle.

[0028] like Figure 4 As shown, to prevent hard collisions when the shock absorber 11 or elastic support 202 fails, a rear wheel longitudinal limiting seat 12 is welded and fixed at the position of the rear wheel axle sleeve 203 corresponding to the longitudinal beam 101. The bottom surface of the longitudinal beam 101 is fixed with a rear wheel longitudinal limiting post 13 by bolts. The limiting seat and the limiting post are arranged vertically and vertically respectively. A rubber buffer pad is pasted on the contact surface of the rear wheel longitudinal limiting seat 12. It is made of natural rubber and has good elastic recovery ability and buffer performance. When the core component of the suspension fails, the limiting seat contacts the limiting post and absorbs the collision energy through the rubber buffer pad, avoiding component damage caused by rigid impact and ensuring vehicle driving safety.

[0029] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rear wheel suspension mechanism for an unmanned logistics vehicle, characterized in that, The chassis (1) includes a chassis (1) and a rear wheel assembly (2). The chassis (1) includes longitudinal beams (101) arranged symmetrically on the left and right, and a front crossbeam (102), a first intermediate crossbeam (103), a second intermediate crossbeam (104) and a rear crossbeam (105) arranged parallel to each other between the two longitudinal beams (101). The second intermediate crossbeam (104) and the rear crossbeam (105) form a rear wheel support (106). The outer sides of the two longitudinal beams (101) corresponding to the second intermediate crossbeam (104) are symmetrically provided with rear spring front brackets (3). The outer sides of the two longitudinal beams (101) corresponding to the rear crossbeam (105) are symmetrically provided with rear spring rear brackets (4). The rear wheel assembly (2) is elastically connected to the rear spring front bracket (3) and the rear spring rear bracket (4).

2. The rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 1, characterized in that, The rear wheel assembly (2) includes an elastic support (202) consisting of several stacked leaf springs (201), the two ends of which are hinged to the front support (3) of the rear spring and the rear support (4) of the rear spring, respectively.

3. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 2, characterized in that, The middle section of the elastic support (202) is provided with a rear wheel axle sleeve fixing seat (5), and the two rear wheel axle sleeve fixing seats (5) are respectively fixed to the rear wheel axle sleeve (203). The rear wheel axle is movably connected inside the rear wheel axle sleeve (203), and the two ends of the rear wheel axle extend out of the rear wheel axle sleeve (203) and are respectively connected to the two rear wheel modules (204).

4. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 3, characterized in that, The outer wall of the rear wheel axle sleeve (203) is provided with a motor bracket (6), and a motor (7) is provided on the motor bracket (6). The motor (7) is connected to the rear wheel axle via a reducer (8).

5. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 3, characterized in that, A rear wheel assembly support beam (107) is provided between the second intermediate crossbeam (104) and the tail end crossbeam (105), and the two ends of the rear wheel assembly support beam (107) are respectively fixed to the inner walls of the two longitudinal beams (101).

6. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 5, characterized in that, The rear wheel assembly support beam (107) is symmetrically provided with upper shock-absorbing brackets (9), and the outer wall of the rear wheel axle sleeve (203) is provided with a lower shock-absorbing bracket (10) corresponding to the upper shock-absorbing bracket (9). One end of the shock absorber (11) is hinged to the upper shock-absorbing bracket (9), and the other end is hinged to the lower shock-absorbing bracket (10).

7. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 3, characterized in that, The rear wheel axle sleeve (203) is provided with a rear wheel longitudinal limiting seat (12) corresponding to the position of the longitudinal beam (101), and the bottom surface of the longitudinal beam (101) is provided with a rear wheel longitudinal limiting post (13) corresponding to the position of the rear wheel longitudinal limiting seat (12).

8. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 7, characterized in that, The contact surface of the rear wheel longitudinal limiting seat (12) is provided with a rubber buffer pad, and the rear wheel longitudinal limiting seat (12) and the rear wheel longitudinal limiting post (13) are arranged vertically in correspondence.

9. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 3, characterized in that, The adjacent leaf springs (201) are fixed together by clamps, and the rear wheel axle is connected to the inner wall of the rear wheel axle sleeve (203) by bearings.

10. A rear wheel suspension mechanism for an unmanned logistics vehicle according to claim 4, characterized in that, The motor (7) and the reducer (8) are integrated together, and the reducer (8) is connected to the rear wheel shaft via gear transmission.

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