A four-wheeled vehicle rear wheel suspension system

Abstract

The application discloses a four-wheeled vehicle rear wheel suspension system, which comprises a four-wheeled vehicle frame, a rear wheel, a spring shock absorber and a Y-shaped swing arm; the rear wheel is coaxially connected to a rear wheel shaft, and the rear wheel shaft is coaxially sleeved with a shaft sleeve through a plurality of bearings; the Y-shaped swing arm is horizontally arranged along the front-back direction, the bifurcated end of the Y-shaped swing arm faces forward, and the non-bifurcated end faces backward; the upper end of the spring shock absorber is hingedly connected to the four-wheeled vehicle frame through an a hinge, and the lower end is hingedly connected to the non-bifurcated end of the Y-shaped swing arm through a b hinge; the shaft sleeve is fixed to the non-bifurcated end of the Y-shaped swing arm; the four-wheeled vehicle frame is provided with a first hinge seat and a second hinge seat, and the first hinge seat and the second hinge seat are located in front of the shaft sleeve; the two ends of the bifurcated end of the Y-shaped swing arm are hingedly connected to the first hinge seat and the second hinge seat respectively; and the impedance of the initial stage of the upward bouncing of the rear wheel can be effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of four-wheeled vehicle suspension. Background Technology

[0002] Electric four-wheeled go-karts, electric four-wheeled sightseeing vehicles in scenic areas, off-road vehicles, and ordinary cars widely use spring shock absorbers in their suspension and shock absorption structures. When the wheel rolls onto a raised part of the ground, the spring shock absorber will adaptively contract upwards, forming resistance to the upward movement of the rear wheel. However, in the initial stage of the rear wheel jumping upwards, the spring shock absorber has a small deformation and forms a small resistance, which results in a strong bumpy feeling for the passengers even if there are only small potholes on the road. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a rear wheel suspension system for a four-wheeled vehicle that can effectively improve the resistance during the initial stage of the rear wheel's upward bounce.

[0004] Technical solution: To achieve the above objectives, the present invention provides a four-wheel vehicle rear wheel suspension system, including a four-wheel vehicle frame, a rear wheel, a spring shock absorber, and a Y-shaped swing arm; the rear wheel is coaxially connected to the rear wheel axle, and a bushing is coaxially sleeved on the outside of the rear wheel axle through several bearings; the Y-shaped swing arm is horizontally arranged in the front-rear direction, with the forked end of the Y-shaped swing arm facing forward and the non-forked end facing backward;

[0005] The upper end of the spring shock absorber is hinged to the four-wheeled vehicle frame via hinge a, and the lower end is hinged to the non-forked end of the Y-shaped swing arm via hinge b; the bushing is fixed to the non-forked end of the Y-shaped swing arm; a first hinge seat and a second hinge seat are installed on the four-wheeled vehicle frame, with the first hinge seat and the second hinge seat in front of the bushing; the two ends of the forked end of the Y-shaped swing arm are respectively hinged to the first hinge seat and the second hinge seat.

[0006] Furthermore, the non-forked end of the Y-shaped swing arm is provided with a concave section of arc, the bushing fits against the inner wall of the concave section of arc, and a locking bolt through hole is provided on the concave section of arc. The locking bolt passes through the locking bolt through hole and is locked in the locking hole on the bushing.

[0007] Furthermore, the upper ends of both the first and second hinge seats are fixed to the four-wheeled vehicle frame.

[0008] Furthermore, the Y-shaped swing arm consists of a main arm and a flexible branch arm; the main arm extends in the front-to-back direction, and the flexible branch arm forms an angle with the main arm; the rear end of the flexible branch arm is fixedly connected to the middle of the main arm through a fixed connector.

[0009] The rear end of the main boom is hinged to the lower end of the spring shock absorber via hinge b, and the concave arc section is located at the rear end of the main boom.

[0010] The front end of the elastic forked arm is hinged to the first hinge seat, and the front end of the main arm is hinged to the second hinge seat.

[0011] Further, the elastic forked arm is made of spring steel, and the main arm is made of structural steel.

[0012] Further, the Y-shaped swing arm is composed of a rear swing arm a, a first front fork arm b and a second front fork arm c; the rear swing arm a extends in the front-rear direction, the first front fork arm b and the second front fork arm c are arranged at an angle; the front ends of the first front fork arm b and the second front fork arm c are respectively hingedly connected to the first hinge seat and the second hinge seat; the rear end of the rear swing arm a is hingedly connected to the lower end of the spring shock absorber through a b hinge; the rear end of the first front fork arm b, the rear end of the second front fork arm c and the front end of the rear swing arm a are hingedly connected to the same vertical hinge shaft.

[0013] Further, the four-wheeled vehicle frame is fixedly provided with left and right first bearing seats and second bearing seats, and further comprises a jump offset compensation shaft extending in the left-right direction, the jump offset compensation shaft being rotatably mounted on the first bearing seat and the second bearing seat through bearings; the jump offset compensation shaft is provided with a first outer thread and a second outer thread, the first outer thread and the second outer thread having equal pitches and opposite helical directions; the first outer thread and the second outer thread are respectively threadedly driven by a inner thread body and a b inner thread body;

[0014] The upper ends of the first hinge seat and the second hinge seat are rotatably mounted with a first vertical shaft and a second vertical shaft through bearings, and the upper ends of the first vertical shaft and the second vertical shaft are fixedly connected with the a inner thread body and the b inner thread body in the transverse direction;

[0015] The vertical hinge shaft is provided with a ball top at the upper end, and a swing lever extending downward and rearward is vertically connected to the middle part of the jump offset compensation shaft; one end of the vertical hinge shaft is coaxially and integrally provided with a torsion disc, a torsion spring is arranged between the torsion disc and the second bearing seat, the torsion spring applies a torque to the jump offset compensation shaft through the torsion disc, so that the swing lever has a downward swinging trend around the jump offset compensation shaft, thereby making the lower side of the end of the swing lever always limitingly contact the ball top.

[0016] Further, when the swing lever swings upward to drive the jump offset compensation shaft to adaptively rotate, the a inner thread body and the b inner thread body move towards each other under the driving of the first outer thread and the second outer thread having opposite helical directions, thereby reducing the angle between the first front fork arm b and the second front fork arm c.

[0017] Further, a guide slide rod parallel to the jump offset compensation shaft is further included, and the two ends of the guide slide rod are fixedly connected with the first bearing seat and the second bearing seat respectively; the guide slide rod passes through guide holes in the a inner thread body and the b inner thread body in a sliding manner;

[0018] Further, the first front fork arm b and the second front fork arm c are spring steel materials; and the rear swing arm a is a structural steel material.

[0019] Beneficial effects: in the first embodiment of the present application, in addition to the elastic bifurcated arm swinging upward around the first hinge seat under the linkage of the main arm, in order to overcome the motion interference, the elastic bifurcated arm itself will also adapt to a certain degree of bending and torsional elastic deformation, which is ultimately transmitted to the rear wheel to form the impedance of the initial upward jumping of the rear wheel, thereby enhancing the initial stage impedance of the upward jumping of the rear wheel, and inhibiting the shaking and bumping feeling of the slight concave-convex road section, and improving the comfort of passengers.

[0020] In the second embodiment, the included angle between the first front fork arm and the second front fork arm decreases during the upward jumping of the rear wheel; the overall total length of the Y-shaped swing arm is increased, and then the rear wheel is relatively offset backward, which forms a confrontation with the forward offset of the rear wheel, and then weakens the degree of forward and backward offset of the rear wheel during the upward jumping. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole perspective view of the present scheme;

[0022] Figure 2 It is a whole front view of the present scheme;

[0023] Figure 3 It is a frame structure schematic view;

[0024] Figure 4 It is a suspension three-dimensional structure schematic view of the first embodiment;

[0025] Figure 5 It is a bottom view of Figure 4 ;

[0026] Figure 6 It is a front view of Figure 4 ;

[0027] Figure 7 It is a suspension three-dimensional structure schematic view of the second embodiment;

[0028] Figure 8 It is a bottom view of Figure 7 ;

[0029] Figure 9 It is a front view of Figure 7 . DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings.

[0031] As shown in the accompanying drawings Figures 1 to 9The application discloses a rear wheel suspension system of a four-wheeled vehicle, and the four-wheeled vehicle is specifically an electric four-wheeled kart, a sightseeing vehicle or an off-road vehicle, which comprises a four-wheeled vehicle frame 1, a rear wheel 2, a spring shock absorber 3 and a Y-shaped swing arm 4; the rear wheel 2 is coaxially connected to a rear wheel shaft 15, the rear wheel shaft 15 is externally coaxially sleeved with a shaft sleeve 8 through a plurality of bearings; the Y-shaped swing arm 4 is horizontally arranged in the front-rear direction, and the bifurcated end of the Y-shaped swing arm 4 faces forward, and the non-bifurcated end faces backward; the upper end of the spring shock absorber 3 is hingedly connected to the four-wheeled vehicle frame 1 through an a hinge 13, and the lower end is hingedly connected to the non-bifurcated end of the Y-shaped swing arm 4 through a b hinge 140; the shaft sleeve 8 is fixed to the non-bifurcated end of the Y-shaped swing arm 4; the four-wheeled vehicle frame 1 is provided with a first hinge seat 11 and a second hinge seat 12, and the first hinge seat 11 and the second hinge seat 12 are located in front of the shaft sleeve 8; the two ends of the bifurcated end of the Y-shaped swing arm 4 are respectively hingedly connected to the first hinge seat 11 and the second hinge seat 12.

[0032] The non-bifurcated end of the Y-shaped swing arm 4 is provided with a circular arc concave section 10, the shaft sleeve 8 is attached to the inner wall of the circular arc concave section 10, the circular arc concave section 10 is provided with a locking bolt through hole 47, and a locking bolt 9 passes through the locking bolt through hole 47 and is locked in a locking hole in the shaft sleeve 8.

[0033] Based on the above basic structure, the application provides two embodiments from two optimization angles.

[0034] The first embodiment is shown in Figure 4 、 5 , 6.

[0035] The upper ends of the first hinge seat 11 and the second hinge seat 12 are fixed to the four-wheeled vehicle frame 1.

[0036] The Y-shaped swing arm 4 is composed of a main arm 4a and an elastic bifurcated arm 4b; the main arm 4a extends in the front-rear direction, and the elastic bifurcated arm 4b is at an angle, specifically an acute angle, to the main arm 4a, and the angle is 10° to 20°; the rear end of the elastic bifurcated arm 4b is fixedly connected to the middle part of the main arm 4a through a fixed connecting piece 16; the rear end of the main arm 4a is hingedly connected to the lower end of the spring shock absorber 3 through the b hinge 140, and the circular arc concave section 10 is located at the rear section of the main arm 4a; the front end of the elastic bifurcated arm 4b is hingedly connected to the first hinge seat 11, and the front end of the main arm 4a is hingedly connected to the second hinge seat 12; the elastic bifurcated arm 4b is made of spring steel; the main arm 4a is made of structural steel, and the thickness of the main arm 4a is significantly greater than that of the elastic bifurcated arm 4b, so that the main arm 4a is relatively rigid compared with the elastic bifurcated arm 4b in this embodiment.

[0037] Working principle of the first embodiment:

[0038] When the rear wheel 2 jumps up when encountering road obstacles, the spring shock absorber 3 is adapted to shrink upward, forming resistance to the upward movement of the rear wheel 2, but in the initial stage of the upward jump of the rear wheel 2, the spring shock absorber 3 forms a small resistance due to a small deformation, and further causes a strong jolt to be formed on the vehicle even if there is only a small pit on the road; in the present scheme, the upward jump of the rear wheel 2 will make the main arm 4a swing upward by a certain distance around the second hinge seat 12, and further make the “fixed connecting piece 16” swing upward by a certain distance around the axis of the second hinge seat 12; if the elastic split arm 4b is also a rigid structure, the “fixed connecting piece 16” needs to swing upward around the axis of the second hinge seat 12 in addition to the upward swing around the axis of the second hinge seat 12, and since the axis of the second hinge seat 12 and the axis of the second hinge seat 12 are not coincident, a motion interference is formed, and in the present case, the elastic split arm 4b is a spring steel material with high elasticity, so that in the process of the main arm 4a swinging upward by a certain distance around the second hinge seat 12, the elastic split arm 4b will be adapted to bend and twist and elastically deform to a certain extent in addition to the upward swing around the first hinge seat 11 under the linkage of the main arm 4a in order to overcome the motion interference, and the bending and twisting and elastic deformation is ultimately transmitted to the rear wheel 2 to form resistance to the initial upward jump of the rear wheel, thereby enhancing the resistance to the initial upward jump of the rear wheel 2, suppressing the shaking and jolting feeling on the slight concave-convex road section, and improving the comfort of the passengers.

[0039] The first embodiment has the following defects: in the process of the upward jump of the rear wheel 2 under the constraint of the main arm 4a, the originally horizontal main arm 4a will be inclined, so that after the upward swing and inclination of the main arm 4a, the rear wheel 2 will not only displace upward but also displace forward relative to the vehicle frame; in the process of jolting, the upward displacement and the forward displacement of the rear wheel 2 relative to the vehicle frame at the same time will dynamically change the positioning parameters such as camber angle and toe angle, cause uneven tire ground contact, and aggravate uneven wear; in general, in the process of the upward jump of the rear wheel 2 under the constraint of the main arm 4a, if the rear wheel 2 has excessive forward and backward relative displacement, many disadvantages will be brought.

[0040] The second embodiment (as shown in Figure 7 、 8 , 9) shows:

[0041] The four-wheel vehicle frame 1 is fixedly provided with left and right distributed first bearing seat 130 and second bearing seat 14, and further includes a jump offset compensation shaft 150 extending in the left-right direction, the jump offset compensation shaft 150 is rotatably installed on the first bearing seat 130 and the second bearing seat 14 through bearings; the jump offset compensation shaft 150 is provided with a first section of external thread 15a and a second external thread 15b, the pitch of the first section of external thread 15a and the second external thread 15b is equal and the helical rotation direction is opposite; the first section of external thread 15a and the second external thread 15b are respectively threadedly driven by a a internal thread body 41 and a b internal thread body 42;

[0042] Further comprising a guide slide rod 420 parallel to the jump offset compensation shaft 150, both ends of the guide slide rod 420 are fixedly connected with the first bearing seat 130 and the second bearing seat 14 respectively; the guide slide rod 420 is movably guided through the guide hole 81 on the a inner threaded body 41 and the b inner threaded body 42;

[0043] The upper ends of the first hinged seat 11 and the second hinged seat 12 are rotatably installed with the first vertical shaft 810 and the second vertical shaft 82 through bearings, and the upper ends of the first vertical shaft 810 and the second vertical shaft 82 are fixedly connected with the transverse a inner threaded body 41 and the b inner threaded body 42 respectively;

[0044] The Y-shaped swing arm 4 is composed of a rear swing arm 4aa, a first front fork arm 4bb and a second front fork arm 4cc; the rear swing arm 4aa extends in the front-rear direction, the first front fork arm 4bb and the second front fork arm 4cc are arranged at an angle, in this case, an acute angle, 10° to 20°; the front ends of the first front fork arm 4bb and the second front fork arm 4cc are hingedly connected to the first hinged seat 11 and the second hinged seat 12 respectively; the rear end of the rear swing arm 4aa is hingedly connected to the lower end of the spring shock absorber 3 through the b hinge 140; the rear end of the first front fork arm 4bb, the rear end of the second front fork arm 4cc and the front end of the rear swing arm 4aa are collectively hingedly connected to the same vertical hinged shaft 5;

[0045] The vertical hinged shaft 5 is provided with a ball top 6 at the upper end; the middle part of the jump offset compensation shaft 150 is vertically connected with a swing rod 7 extending downward and rearward; one end of the vertical hinged shaft 5 is coaxially and integrally provided with a torsion disc 44, a torsion spring 43 is arranged between the torsion disc 44 and the second bearing seat 14, the torsion spring 43 applies a torque to the jump offset compensation shaft 150 through the torsion disc 44, so that the swing rod 7 has a tendency to swing downward around the jump offset compensation shaft 150, thereby making the lower side of the end of the swing rod 7 always limitingly contact the ball top 6;

[0046] When the swing rod 7 is driven to adaptively rotate by swinging upward, the a inner threaded body 41 and the b inner threaded body 42 are driven to move closer to each other by the first outer thread 15a and the second outer thread 15b with opposite screw directions, thereby reducing the angle between the first front fork arm 4bb and the second front fork arm 4cc.

[0047] The first front fork arm 4bb, the second front fork arm 4cc and the rear swing arm 4aa are all made of structural steel.

[0048] Working principle of the second embodiment:

[0049] When the rear wheel 2 jumps up when encountering road obstacles, the spring shock absorber 3 is adapted to shrink upward, forming resistance to the upward movement of the rear wheel 2, and the Y-shaped swing arm 4 swings upward following the rear wheel 2. Since the Y-shaped swing arm 4 is horizontal in the initial state, if the positions of the first and second hinge seats 11 and 12 are fixed (the positions of the first and second hinge seats 11 and 12 are fixed in the first embodiment), the rear wheel 2 will inevitably shift forward a certain distance relative to the four-wheeled vehicle frame 1 during the upward jump. In the present scheme, during the upward jump of the rear wheel 2, the rear swing arm 4aa jumps upward following the rear wheel 2, and the first and second front fork arms 4bb and 4cc swing upward following the rear swing arm 4aa, and the first and second vertical shafts 810 and 82 adaptively rotate, at the same time, the vertical hinge shaft 5 jumps upward following the rear swing arm 4aa a certain distance, which pushes the swing rod 7 to swing upward during the upward jump of the swing rod 7, and the swing rod 7 drives the jump offset compensation shaft 150 to rotate correspondingly, the a inner threaded body 41 and the b inner threaded body 42 move closer to each other under the drive of the first and second outer threads 15a and 15b with opposite helical directions, thereby reducing the included angle between the first and second front fork arms 4bb and 4cc; the reduction of the included angle between the first and second front fork arms 4bb and 4cc increases the overall length of the Y-shaped swing arm 4 (the degree of increase is directly related to the pitch of the first and second outer threads 15a and 15b, which is adaptively selected according to actual conditions), which in turn causes the rear wheel 2 to shift backward relative to the forward shift, and the forward and backward shifts of the rear wheel 2 form a counterattack, thereby weakening the degree of forward and backward shift during the upward jump of the rear wheel 2.

[0050] At the same time, the resistance formed by the transmission process of the a inner threaded body 41 and the b inner threaded body 42 during the above process exactly constitutes the resistance to the upward jump of the rear wheel in the initial stage, thereby enhancing the initial stage resistance to the upward jump of the rear wheel 2, inhibiting the shaking and jolting feeling of the slight concave-convex road section, and improving the comfort of passengers.

[0051] The above is only the preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A quad bike rear wheel suspension system characterised in that: The utility model provides a four-wheeled vehicle frame, rear wheel, spring shock absorber and Y type swing arm, the rear wheel coaxial connection is in rear wheel shaft (15) on, rear wheel shaft (15) outside through a plurality of bearings coaxial sleeve joint has the axle sleeve (8), Y type swing arm (4) horizontal setting along the front and back direction, Y type swing arm (4) bifurcation end faces forward, non bifurcation end faces backward, spring shock absorber (3) upper end through a hinge (13) hinge four-wheeled vehicle frame (1), lower end through b hinge (140) hinge Y type swing arm (4) non bifurcation end, axle sleeve (8) with Y type swing arm (4) non bifurcation end fixed, four-wheeled vehicle frame (1) on install first hinge seat (11) and second hinge seat (12), first hinge seat (11) and second hinge seat (12) in axle sleeve (8) front, Y type swing arm (4) bifurcation end two ends are respectively hinged in first hinge seat (11) and second hinge seat (12), Y type swing arm (4) non bifurcation end is provided with a section of circular arc concave section (10), axle sleeve (8) is attached to the inner wall of circular arc concave section (10), and circular arc concave section (10) is provided with locking bolt through hole (47), and locking bolt (9) passes through locking bolt through hole (47) and is locked on the locking hole on axle sleeve (8), Y type swing arm (4) is by rear swing arm (4aa), first front fork arm (4bb) and second front fork arm (4cc) constitute, rear swing arm (4aa) extends along the front and back direction, first front fork arm (4bb) and second front fork arm (4cc) are arranged at an angle, the front end of first front fork arm (4bb) and second front fork arm (4cc) are respectively hinged in first hinge seat (11) and second hinge seat (12), the rear end of rear swing arm (4aa) is hinged with the lower end of spring shock absorber (3) through b hinge (140), the rear end of first front fork arm (4bb), the rear end of second front fork arm (4cc) and the front end of rear swing arm (4aa) are hinged on the same vertical hinge shaft (5), four-wheeled vehicle frame (1) is fixedly provided with first bearing seat (130) and second bearing seat (14) distributed left and right, further include the jump offset compensation shaft (150) extending along the left and right direction, the jump offset compensation shaft (150) is rotatably installed on first bearing seat (130) and second bearing seat (14) through bearing, the jump offset compensation shaft (150) is provided with first section outer thread (15a) and second outer thread (15b), the pitch of first section outer thread (15a) and second outer thread (15b) is equal and the spiral rotation direction is opposite, a inner thread body (41) and b inner thread body (42) are respectively threadedly driven on first section outer thread (15a) and second outer thread (15b) outside, the upper end of first hinge seat (11) and second hinge seat (12) is rotatably installed with first vertical shaft (810) and second vertical shaft (82), the upper end of first vertical shaft (810) and second vertical shaft (82) is fixedly connected with a inner thread body (41) and b inner thread body (42) of transverse a respectively, ​ ​ ​ ​ ​ The upper end of the vertical hinge shaft (5) is provided with a ball top (6); the middle part of the bounce offset compensation shaft (150) is vertically connected with a rear downward extending swing lever (7); one end of the vertical hinge shaft (5) is coaxially and integrally provided with a torsion disc (44), a torsion spring (43) is arranged between the torsion disc (44) and the second bearing seat (14), the torsion spring (43) applies a torque to the bounce offset compensation shaft (150) through the torsion disc (44), so that the swing lever (7) has a downward swinging trend around the bounce offset compensation shaft (150), so that the lower end of the swing lever (7) is always in contact with the ball top (6).

2. A quad bike rear wheel suspension system as claimed in claim 1, characterised in that: The upper ends of the first hinge seat (11) and the second hinge seat (12) are fixed on the four-wheeled vehicle frame (1).

3. A quad bike rear wheel suspension system as claimed in claim 2, characterised in that: When the swing lever (7) swings upward to drive the bounce offset compensation shaft (150) to adaptively rotate, the a inner threaded body (41) and the b inner threaded body (42) move close to each other under the drive of the first outer thread (15a) and the second outer thread (15b) with opposite screw directions, so that the included angle between the first front fork arm (4bb) and the second front fork arm (4cc) becomes smaller.

4. A quad bike rear wheel suspension system as claimed in claim 3, characterised in that: It also includes a guide slide rod (420) parallel to the bounce offset compensation shaft (150), the two ends of the guide slide rod (420) are respectively fixedly connected with the first bearing seat (130) and the second bearing seat (14); the guide slide rod (420) is movably guided through the guide holes (81) on the a inner threaded body (41) and the b inner threaded body (42).

5. A quad bike rear wheel suspension system as claimed in claim 1, characterised in that: The first front fork arm (4bb) and the second front fork arm (4cc) are made of spring steel material; the rear swing arm (4aa) is made of structural steel material.

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