Chassis structure with variable wheel track

Abstract

The utility model relates to a chassis structure with a variable wheel track, which comprises a front variable auxiliary frame assembly, a front left active adjusting module assembly, a front right active adjusting module assembly, a rear variable auxiliary frame assembly, a rear left active adjusting module assembly, a rear right active adjusting module assembly and an integrated controller, the active adjusting module assemblies are the same in structure, the front variable auxiliary frame assembly and the front active adjusting module assembly are used for adjusting the front axle tread, and the rear variable auxiliary frame assembly and the rear active adjusting module assembly are used for adjusting the rear axle tread. The integrated controller is connected with the front left active adjusting module assembly, the front right active adjusting module assembly, the rear left active adjusting module assembly and the rear right active adjusting module assembly through CAN lines. According to the utility model, the wheel track of the automobile can be reduced under the low-speed working condition, the maneuverability and the trafficability of narrow road conditions are improved, and the wheel track is increased under the high-speed working condition, and the operation stability is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of automobile parts, in particular to a chassis structure with a variable wheelbase. [Background Technology]

[0002] With the improvement of people's material living standards and the rapid development of the automobile industry, consumers have higher and higher requirements for driving diversity. For the majority of consumers, a good vehicle needs to be highly electronic, intelligent, highly maneuverable and have good handling performance.

[0003] As an important system of the whole vehicle, the chassis directly determines the maneuverability and handling stability of the whole vehicle. Among them, the wheelbase has an impact on the maneuverability and handling stability of the whole vehicle. A small wheelbase can reduce the turning diameter and improve maneuverability, while a large wheelbase can have better handling stability at high speeds. However, the wheelbase of vehicles currently sold on the market is fixed and cannot be changed, so there is a certain degree of constraint on the upper limit of the maneuverability and handling stability of the whole vehicle. [Contents of the utility model]

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies and provide a chassis structure with a variable wheelbase, which can reduce the wheelbase of the car under low-speed conditions, improve maneuverability and the ability to pass through narrow roads, and increase the wheelbase under high-speed conditions to improve handling stability.

[0005] In order to achieve the above purpose, a chassis structure with a variable wheelbase is designed, including a front variable subframe assembly 1, a front left active adjustment module assembly 2, a front right active adjustment module assembly 3, a rear variable subframe assembly 4, a rear left active adjustment module assembly 5, a rear right active adjustment module assembly 6 and an integrated controller 7. The front variable subframe assembly 1 has the same structure as the rear variable subframe assembly 4, and the front left active adjustment module assembly 2, the front right active adjustment module assembly 3, the rear left active adjustment module assembly 5, the rear right active adjustment module assembly 6 and an integrated controller 7. The adjustment module assembly 6 has the same structure. The front variable subframe assembly 1, the front left active adjustment module assembly 2 and the front right active adjustment module assembly 3 are used to adjust the front axle track. The rear variable subframe assembly 4, the rear left active adjustment module assembly 5 and the rear right active adjustment module assembly 6 are used to adjust the rear axle track. The integrated controller 7 is respectively connected to the front left active adjustment module assembly 2, the front right active adjustment module assembly 3, the rear left active adjustment module assembly 5 and the rear right active adjustment module assembly 6 through CAN lines.

[0006] Furthermore, the front variable subframe assembly 1 is composed of a left subframe welding assembly 11, a right subframe welding assembly 13 and a middle subframe welding assembly 12. The left subframe welding assembly 11 and the right subframe welding assembly 13 are respectively connected to the left and right sides of the middle subframe welding assembly 12. The left subframe welding assembly 11 and the right subframe welding assembly 13 slide left and right relative to the middle subframe welding assembly 12 respectively. The left subframe welding assembly 11 is connected to the suspension link on the left, the right subframe welding assembly 13 is connected to the suspension link on the right, and the middle subframe welding assembly 12 is connected to the vehicle body.

[0007] Furthermore, the left side subframe welding assembly 11 is composed of a left longitudinal beam 112, a left front corner beam 111, a left rear corner beam 114 and a left ball head connecting bracket 113, the middle subframe welding assembly 12 is welded by a front cross beam 121, a rear cross beam 123 and a middle longitudinal beam 122, and the right side subframe welding assembly 13 is composed of a right longitudinal beam 132, a right front corner beam 131, a right rear corner beam 134 and a right ball head connecting bracket 133.

[0008] Furthermore, the left front corner beam 111 and the left rear corner beam 114 of the left side sub-frame welding assembly 11 are matched with the front cross beam 121 and the rear cross beam 123 of the middle sub-frame welding assembly 12 respectively; the left and right ends of the front cross beam 121 and the rear cross beam 123 of the middle sub-frame welding assembly 12 are both set as hollow slideway structures 1212; the left front corner beam 111 and the left rear corner beam 114 of the left side sub-frame welding assembly 11 are arranged on the middle sub-frame welding assembly 12. 2, and slide freely in the hollow slide through clearance fit; the right front corner beam 131 and the right rear corner beam 134 of the right side sub-frame welding assembly 13 are matched with the front cross beam 121 and the rear cross beam 123 of the middle sub-frame welding assembly 12 respectively; the right front corner beam 131 and the right rear corner beam 134 of the right side sub-frame welding assembly 13 are arranged in the hollow slide of the middle sub-frame welding assembly 12, and slide freely in the hollow slide through clearance fit.

[0009] Furthermore, an opening groove 1211 is provided on the middle sub-frame welding assembly 12, and a slider 1111 is connected to the left front corner beam 111 and the left rear corner beam 114 of the left sub-frame welding assembly 11, and the right front corner beam 131 and the right rear corner beam 134 of the right sub-frame welding assembly 13 by pressing, welding or bolting. The slider 1111 is arranged corresponding to the opening groove 1211 of the middle sub-frame welding assembly 12 and is arranged in the opening groove 1211. The slider 1111 slides left and right within the range of the opening groove 1211.

[0010] Furthermore, the front left active adjustment module assembly 2 includes a housing 201, a motor stator 202, a motor rotor 203, a bearing 204, a recirculating ball nut 205, an outer ball head seat 206, a tie rod 207, an inner ball head seat 208, a bushing 209 and a rack 210. The motor stator 202 is fixed in the housing 201, and the motor rotor 203 is fixed in the housing 201 through bearings 204 at both ends. The motor rotor 203 is coaxially arranged with the motor stator 202, and the motor stator 202 and the motor rotor 203 are clearance-matched to form a magnetic gap. The recirculating ball nut 205 is connected to the motor rotor 203 by threaded connection or press-fitting. The circulating ball nut 205 is coaxially arranged with the motor stator 202, and the axial freedom of the circulating ball nut 205 is constrained on the outside by a press-fit block or a tightening nut; the rack 210 is coaxially arranged with the circulating ball nut 205, and both ends of the rack 210 are supported in the housing 201 through bushings; the inner side of the circulating ball nut 205 is provided with threads, and the outer side of the rack 210 is provided with teeth, and the circulating ball nut 205 and the rack 210 form a screw-nut meshing kinematic pair; the rack 210 is connected to the inner ball head seat 208 by threads, and the inner ball head and the outer ball head of the pull rod 207 are pressed into the inner ball head seat 208 and the outer ball head seat 206 respectively.

[0011] Furthermore, the outer ball head seats 206 of the front left active adjustment module assembly 2 and the front right active adjustment module assembly 3 are respectively connected to the ball head connecting brackets on the left subframe welding assembly 11 and the right subframe welding assembly 13, and are fastened by nuts; the front left active adjustment module assembly 2 controls the suspension link and tire position on the left side, and the front right active adjustment module assembly 3 controls the suspension and tire position on the right side.

[0012] Compared with the prior art, the utility model provides a chassis structure with a variable wheelbase, which actively controls the suspension connecting rod and tire position through a motor, and adjusts the wheelbase in an electric and intelligent manner. The integrated controller controls the wheelbase by receiving driver instructions and the driving status of the entire vehicle, so that the wheelbase of the vehicle can be reduced under low-speed conditions, thereby improving maneuverability and the ability to pass through narrow roads, and the wheelbase can be increased under high-speed conditions, thereby improving handling stability. The utility model is worthy of popularization and application. [Drawings]

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the welding assembly of the front variable subframe of the utility model;

[0015] Figure 3 It is a schematic diagram of the sub-components of the welding assembly of the front variable auxiliary frame of the utility model;

[0016] Figure 4 It is a schematic diagram of the matching slideway of the left sub-frame crossbeam assembly and the middle sub-frame welding assembly of the utility model;

[0017] Figure 5 It is a schematic diagram of the matching between the angle beam slider of the left side sub-frame cross beam assembly and the opening groove of the middle sub-frame assembly of the utility model;

[0018] Figure 6 It is a schematic diagram of the sub-components of the active adjustment module assembly of the utility model;

[0019] In the figure: 1, front variable subframe assembly 2, front left active adjustment module assembly 3, front right active adjustment module assembly 4, rear variable subframe assembly 5, rear left active adjustment module assembly 6, rear right active adjustment module assembly 7, integrated controller 11, left subframe welding assembly 12, middle subframe welding assembly 13, right subframe welding assembly 111, left front corner beam 112, left longitudinal beam 113, left ball joint connecting bracket 114, left rear corner beam 1 21, front cross beam 122, middle longitudinal beam 123, rear cross beam 131, right front angle beam (132, right longitudinal beam 133, right ball head connecting bracket 134, right rear angle beam 1111, slider 1211, open slot 1212, hollow slideway structure 201, housing 202, motor stator 203, motor rotor 204, bearing 205, recirculating ball nut 206, outer ball head seat 207, tie rod 208, inner ball head seat 209, bushing 210, rack. [Specific implementation method]

[0020] As attached Figure 1 As shown, the utility model provides a chassis structure with a variable wheelbase, including a front variable subframe assembly 1, a front left active adjustment module assembly 2, a front right active adjustment module assembly 3, a rear variable subframe assembly 4, a rear left active adjustment module assembly 5, a rear right active adjustment module assembly 6 and an integrated controller 7. The front variable subframe assembly 1 has the same structure as the rear variable subframe assembly 4, and the front left active adjustment module assembly 2, the front right active adjustment module assembly 3, the rear left active adjustment module assembly 5, and the rear right active adjustment module assembly 6 have the same structure. The front variable subframe assembly 1, the front left active adjustment module assembly 2 and the front right active adjustment module assembly 3 are used to adjust the front axle wheelbase, and the rear variable subframe assembly 4, the rear left active adjustment module assembly 5 and the rear right active adjustment module assembly 6 are used to adjust the rear axle wheelbase. The integrated controller 7 is respectively connected to the front left active adjustment module assembly 2, the front right active adjustment module assembly 3, the rear left active adjustment module assembly 5 and the rear right active adjustment module assembly 6 through CAN lines.

[0021] As attached Figure 2As shown, the front variable subframe assembly 1 is composed of a left subframe welding assembly 11, a right subframe welding assembly 13 and a middle subframe welding assembly 12. The left subframe welding assembly 11 and the right subframe welding assembly 13 are respectively connected to the left and right sides of the middle subframe welding assembly 12. The left subframe welding assembly 11 and the right subframe welding assembly 13 slide left and right relative to the middle subframe welding assembly 12 respectively. The left subframe welding assembly 11 is connected to the left suspension link, the right subframe welding assembly 13 is connected to the right suspension link, and the middle subframe welding assembly 12 is connected to the vehicle body.

[0022] As attached Figure 3 As shown, the left side subframe welding assembly 11 is composed of a left longitudinal beam 112, a left front angle beam 111, a left rear angle beam 114 and a left ball head connecting bracket 113, the middle subframe welding assembly 12 is welded by a front cross beam 121, a rear cross beam 123 and a middle longitudinal beam 122, and the right side subframe welding assembly 13 is composed of a right longitudinal beam 132, a right front angle beam 131, a right rear angle beam 134 and a right ball head connecting bracket 133; the left front angle beam 111 and the left rear angle beam 114 of the left side subframe welding assembly 11 are matched with the front cross beam 121 and the rear cross beam 123 of the middle subframe welding assembly 12 respectively; the front cross beam 121 and the rear cross beam 123 of the middle subframe welding assembly 12 are matched with the front cross beam 121 and the rear cross beam 123 of the middle subframe welding assembly 12 respectively. The left and right ends of the cross beam 123 are both set as hollow slide structures 1212; the left front corner beam 111 and the left rear corner beam 114 of the left subframe welding assembly 11 are arranged in the hollow slide of the middle subframe welding assembly 12, and slide freely in the hollow slide through clearance fit; the right front corner beam 131 and the right rear corner beam 134 of the right subframe welding assembly 13 are matched with the front cross beam 121 and the rear cross beam 123 of the middle subframe welding assembly 12 respectively; the right front corner beam 131 and the right rear corner beam 134 of the right subframe welding assembly 13 are arranged in the hollow slide of the middle subframe welding assembly 12, and slide freely in the hollow slide through clearance fit.

[0023] As attached Figure 4 and attached Figure 5 As shown, an open groove 1211 is provided on the middle sub-frame welding assembly 12, and a slider 1111 is connected to the left front corner beam 111 and the left rear corner beam 114 of the left sub-frame welding assembly 11, and the right front corner beam 131 and the right rear corner beam 134 of the right sub-frame welding assembly 13 by pressing, welding or bolting. The slider 1111 is arranged corresponding to the open groove 1211 of the middle sub-frame welding assembly 12 and is arranged in the open groove 1211. The slider 1111 slides left and right within the range of the open groove 1211.

[0024] As attached Figure 6As shown, the front left active adjustment module assembly 2 includes a housing 201, a motor stator 202, a motor rotor 203, a bearing 204, a recirculating ball nut 205, an outer ball head seat 206, a tie rod 207, an inner ball head seat 208, a bushing 209 and a rack 210. The motor stator 202 is fixed in the housing 201, and the motor rotor 203 is fixed in the housing 201 through bearings 204 at both ends. The motor rotor 203 is coaxially arranged with the motor stator 202, and the motor stator 202 and the motor rotor 203 are gap-matched to form a magnetic gap. The recirculating ball nut 205 is connected to the motor rotor 203 by threaded connection or press-fitting. The circulating ball nut 205 is coaxially arranged with the motor stator 202, and the axial freedom of the circulating ball nut 205 is constrained on the outside by a press-fit block or a tightening nut; the rack 210 is coaxially arranged with the circulating ball nut 205, and both ends of the rack 210 are supported in the housing 201 through bushings; the inner side of the circulating ball nut 205 is provided with threads, and the outer side of the rack 210 is provided with teeth, and the circulating ball nut 205 and the rack 210 form a screw-nut meshing kinematic pair; the rack 210 is connected to the inner ball head seat 208 by threads, and the inner ball head and the outer ball head of the pull rod 207 are pressed into the inner ball head seat 208 and the outer ball head seat 206 respectively.

[0025] The outer ball head seats 206 of the front left active adjustment module assembly 2 and the front right active adjustment module assembly 3 are respectively connected to the ball head connecting brackets on the left subframe welding assembly 11 and the right subframe welding assembly 13, and are fastened by nuts; the front left active adjustment module assembly 2 controls the suspension link and tire position on the left side, and the front right active adjustment module assembly 3 controls the suspension and tire position on the right side.

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0027] The utility model provides a chassis structure with a variable wheelbase, including a front variable subframe assembly 1, a front left active adjustment module assembly 2, a front right active adjustment module assembly 3, a rear variable subframe assembly 4, a rear left active adjustment module assembly 5, a rear right active adjustment module assembly 6 and an integrated controller 7. The front variable subframe assembly consists of three main parts: a left subframe welding assembly, a right subframe welding assembly and a middle subframe welding assembly; further, the left subframe welding assembly consists of a left longitudinal beam, a front angle beam, a rear angle beam and a ball head connecting bracket, the middle subframe welding assembly is formed by welding a front cross beam, a rear cross beam and a middle longitudinal beam, and the right subframe welding assembly is formed by welding a right longitudinal beam, a front angle beam, a rear angle beam and a ball head connecting bracket.

[0028] The left subframe welding assembly is connected to the left suspension link, the right subframe welding assembly is connected to the right suspension link, and the middle subframe welding assembly is connected to the vehicle body. The front angle beam and rear angle beam of the left subframe welding assembly are matched with the front cross beam and rear cross beam of the middle subframe welding assembly respectively; the left and right ends of the front beam and rear beam of the middle subframe welding assembly are set as hollow slideway structures, and the front angle beam and rear angle beam of the left subframe welding assembly are arranged in the hollow slideway of the middle subframe welding assembly, and can slide freely in the slideway through clearance fit. Similarly, the front angle beam and rear angle beam of the right subframe welding assembly are matched with the front cross beam and rear cross beam of the middle subframe welding assembly respectively; the left and right ends of the front beam and rear beam of the middle subframe welding assembly are set as hollow slideway structures, and the front angle beam and rear angle beam of the right subframe welding assembly are arranged in the hollow slideway of the middle subframe welding assembly, and can slide freely in the slideway through clearance fit.

[0029] The middle sub-frame welding assembly is provided with an open slot. Accordingly, the front angle beam and the rear angle beam of the left sub-frame welding assembly and the right sub-frame welding assembly are provided with sliders at positions corresponding to the open slot of the middle sub-frame welding assembly. The sliders are connected to the front angle beam and the rear angle beam by press-fitting, welding or bolts. The sliders of the left sub-frame welding assembly and the right sub-frame welding assembly are arranged in the open slot of the middle sub-frame welding assembly. The sliders can slide left and right within the range of the open slot and cannot move forward and backward. When the left / right sub-frame welding assembly and the middle sub-frame welding assembly slide relative to each other, the sliders play a guiding role. When sliding to the end, the sliders contact the slide slots and play a limiting role.

[0030] The front left active adjustment module assembly and the front right active adjustment module assembly have the same structure, both of which are composed of a housing, a motor stator, a motor rotor, a recirculating ball nut mechanism, a rack, a bearing, a bushing, an inner ball head seat, a tie rod and an outer ball head seat. The motor stator is fixed on the housing, and the motor rotor is fixed on the housing through bearings at both ends; the motor rotor is coaxially arranged with the motor stator, and the motor stator and the motor rotor are gap-matched to form a magnetic gap; the circulating ball nut is connected to the motor rotor through threaded connection or press-fitting, and the circulating ball nut is coaxially arranged with the motor stator; the axial freedom of the circulating ball nut is constrained by a press-fit block or a tightening nut on the outside of the circulating ball nut; the rack is coaxially arranged with the circulating ball nut, and both ends of the rack are supported in the housing through bushings; threads are provided on the inside of the circulating ball nut, and teeth are provided on the outside of the rack, and the circulating ball nut and the rack form a screw-nut meshing kinematic pair; the rack is connected to the inner ball head seat through threads, and the inner ball head and outer ball head of the pull rod are pressed into the inner ball head seat and the outer ball head seat respectively; the outer ball head pin is connected to the ball head connecting bracket on the left subframe welding assembly and is fastened by a nut; the front left active adjustment module assembly controls the suspension link and tire position on the left, and the front right active adjustment module assembly controls the suspension and tire position on the right.

[0031] The rear variable subframe assembly and the rear active adjustment module assembly have the same structure as the front variable subframe assembly and the front active adjustment module assembly. The front variable subframe assembly, the front left active adjustment module assembly and the front right active adjustment module assembly are used to adjust the front axle track, and the rear variable subframe assembly, the rear left active adjustment module assembly and the rear right active adjustment module assembly are used to adjust the rear axle track. The integrated controller is connected to the front left active adjustment module, the front right active adjustment module, the rear left active adjustment module and the rear right active adjustment module through the CAN line.

[0032] The working principle of the utility model is as follows: the integrated controller receives the driver's instructions, monitors the driving state of the whole vehicle, and jointly controls to send control instructions to the front left active adjustment module, the front right active adjustment module, the rear left active adjustment module and the rear right active adjustment module. When the integrated controller detects the driver's instruction to adjust the wheelbase, the integrated controller will perform conditional judgment to determine whether the current state meets the functional preconditions. After determining that the functional preconditions are met, the front left active adjustment module assembly controls the rotor to rotate through electromagnetic control, the rotor drives the nut to rotate, the nut rotates to push the rack to move, and the rack transmits the force to the front left subframe welding assembly through the pull rod. The front left subframe welding assembly is an integral part of the left suspension link and the left tire. After the rack thrust is greater than the ground resistance torque and the internal friction force, it begins to move inward or outward, thereby changing the position of the left tire of the front axle. Similarly, the front right active adjustment module assembly changes the position of the right tire of the front axle, thereby changing the front axle wheelbase. The rear axle wheelbase control principle is the same.

[0033] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0034] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A chassis structure with a variable wheelbase, characterized in that: The invention comprises a front variable subframe assembly (1), a front left active adjustment module assembly (2), a front right active adjustment module assembly (3), a rear variable subframe assembly (4), a rear left active adjustment module assembly (5), a rear right active adjustment module assembly (6) and an integrated controller (7), wherein the front variable subframe assembly (1) and the rear variable subframe assembly (4) have the same structure, and the front left active adjustment module assembly (2), the front right active adjustment module assembly (3), the rear left active adjustment module assembly (5), and the rear right active adjustment module assembly (6) have the same structure. The vehicle has the same structure, the front variable subframe assembly (1), the front left active adjustment module assembly (2) and the front right active adjustment module assembly (3) are used to adjust the front axle track, the rear variable subframe assembly (4), the rear left active adjustment module assembly (5) and the rear right active adjustment module assembly (6) are used to adjust the rear axle track, and the integrated controller (7) is respectively connected to the front left active adjustment module assembly (2), the front right active adjustment module assembly (3), the rear left active adjustment module assembly (5) and the rear right active adjustment module assembly (6) through CAN lines.

2. The chassis structure with variable wheelbase according to claim 1, characterized in that: The front variable sub-frame assembly (1) is composed of a left sub-frame welding assembly (11), a right sub-frame welding assembly (13) and a middle sub-frame welding assembly (12); the left sub-frame welding assembly (11) and the right sub-frame welding assembly (13) are respectively connected to the left and right sides of the middle sub-frame welding assembly (12); the left sub-frame welding assembly (11) and the right sub-frame welding assembly (13) slide left and right relative to the middle sub-frame welding assembly (12); the left sub-frame welding assembly (11) is connected to the left suspension link, the right sub-frame welding assembly (13) is connected to the right suspension link, and the middle sub-frame welding assembly (12) is connected to the vehicle body.

3. The chassis structure with variable wheelbase as claimed in claim 2, characterized in that: The left sub-frame welding assembly (11) is composed of a left longitudinal beam (112), a left front corner beam (111), a left rear corner beam (114) and a left ball head connecting bracket (113); the middle sub-frame welding assembly (12) is welded from a front cross beam (121), a rear cross beam (123) and a middle longitudinal beam (122); and the right sub-frame welding assembly (13) is composed of a right longitudinal beam (132), a right front corner beam (131), a right rear corner beam (134) and a right ball head connecting bracket (133).

4. The chassis structure with variable wheelbase as claimed in claim 3, characterized in that: The left front corner beam (111) and the left rear corner beam (114) of the left side auxiliary frame welding assembly (11) are matched with the front cross beam (121) and the rear cross beam (123) of the middle auxiliary frame welding assembly (12) respectively; the left and right ends of the front cross beam (121) and the rear cross beam (123) of the middle auxiliary frame welding assembly (12) are both provided with hollow slideway structures (1212); the left front corner beam (111) and the left rear corner beam (114) of the left side auxiliary frame welding assembly (11) are arranged on the middle auxiliary frame welding assembly (12); The right side auxiliary frame welding assembly (13) is arranged in the hollow slideway of the middle auxiliary frame welding assembly (12), and slides freely in the hollow slideway through clearance fit; the right front corner beam (131) and the right rear corner beam (134) of the right side auxiliary frame welding assembly (13) are matched with the front cross beam (121) and the rear cross beam (123) of the middle auxiliary frame welding assembly (12) respectively; the right front corner beam (131) and the right rear corner beam (134) of the right side auxiliary frame welding assembly (13) are arranged in the hollow slideway of the middle auxiliary frame welding assembly (12), and slide freely in the hollow slideway through clearance fit.

5. The chassis structure with variable wheelbase as claimed in claim 3, characterized in that: The middle sub-frame welding assembly (12) is provided with an open groove (1211); the left front corner beam (111) and the left rear corner beam (114) of the left sub-frame welding assembly (11), and the right front corner beam (131) and the right rear corner beam (134) of the right sub-frame welding assembly (13) are all connected with a slider (1111) by pressing, welding or bolting; the slider (1111) is arranged corresponding to the open groove (1211) of the middle sub-frame welding assembly (12) and is arranged in the open groove (1211); the slider (1111) slides left and right within the range of the open groove (1211).

6. The chassis structure with variable wheelbase according to any one of claims 1 to 5, characterized in that: The front left active adjustment module assembly (2) comprises a housing (201), a motor stator (202), a motor rotor (203), a bearing (204), a recirculating ball nut (205), an outer ball head seat (206), a tie rod (207), an inner ball head seat (208), a bushing (209) and a rack (210). The motor stator (202) is fixed in the housing (201). The motor rotor (203) is fixed in the housing (201) by bearings (204) at both ends. The motor rotor (203) and the motor stator (202) are coaxially arranged. The motor stator (202) and the motor rotor (203) are clearance-matched to form a magnetic gap. The recirculating ball nut (205) is threadedly connected or press-fitted to the motor rotor (203). ), the circulating ball nut (205) is coaxially arranged with the motor stator (202), and the outer side of the circulating ball nut (205) constrains its axial freedom by a press-fit block or a tightening nut; the rack (210) is coaxially arranged with the circulating ball nut (205), and both ends of the rack (210) are supported in the housing (201) by bushings; the inner side of the circulating ball nut (205) is provided with threads, and the outer side of the rack (210) is provided with teeth, and the circulating ball nut (205) and the rack (210) form a screw-nut meshing kinematic pair; the rack (210) is connected with the inner ball head seat (208) by threads, and the inner ball head and the outer ball head of the pull rod (207) are pressed into the inner ball head seat (208) and the outer ball head seat (206) respectively.

7. The chassis structure with variable wheelbase according to claim 6, characterized in that: The outer ball head seats (206) of the front left active adjustment module assembly (2) and the front right active adjustment module assembly (3) are respectively connected to the ball head connection brackets on the left subframe welding assembly (11) and the right subframe welding assembly (13), and are fastened by nuts; the front left active adjustment module assembly (2) controls the suspension link and tire position on the left side, and the front right active adjustment module assembly (3) controls the suspension and tire position on the right side.

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