CN220670377U - Middle and rear axle assembly gauge - Google Patents

Abstract

The utility model relates to the field of automobile inspection tools, in particular to a middle and rear axle assembly inspection tool which comprises a base, a frame assembly, a balance suspension, a lower reaction rod assembly, a middle axle assembly, a rear axle assembly, an upper reaction rod assembly, a leaf spring assembly and a measuring platform, wherein a supporting seat for supporting the upper reaction rod assembly and the lower reaction rod assembly is arranged on the measuring platform. The standard frame assembly, the middle-rear axle assembly and the rear bumper assembly are matched with each other to verify whether the vehicle frame assembly is a frame problem or a quality problem of an axle, verify the assembly effect of the frame main body and the connecting pieces related to the middle-rear axle and the rear bumper, and play a role in guiding modification; the rear protection area can be matched, and mutual matching verification of accessories such as bumpers can be performed; the I pole and the V pole can be placed on the monitoring platform to calibrate the angle of the joint, and the operation is convenient and accurate.

Description

Middle and rear axle assembly gauge

Technical Field

The utility model relates to the field of automobile inspection tools, in particular to a middle and rear axle assembly inspection tool.

Background

The main body of the automobile inspection tool is a main frame of the inspection tool and comprises an inspection tool base (namely a reference surface), a vehicle body surface and a mounting part, wherein the base and the vehicle body surface are generally made of epoxy resin or aluminum materials. In the product verification stage, the automobile inspection tool can play a key role, and particularly in the first trial assembly stage of batch parts, many design confirmation works can be carried out on the main model inspection tool. Automotive gauge manufacturing is typically categorized as aluminum, resin or iron, which must be maintained and handled on a regular basis for routine maintenance and service life. The existing verification mode about the rear axle of the truck is as follows: the welding frame is adopted to verify the assembly of the front axle, the middle axle and the rear axle, the accurate verification effect cannot be achieved, the frame problem or the front axle, the middle axle and the rear axle cannot be effectively monitored, and the scheme is generated due to the fact that the effective monitoring cannot be performed.

Disclosure of Invention

It is an object of the present utility model to address at least the above problems with a mid-rear axle assembly gauge.

In order to solve the technical problems, the utility model adopts the following technical scheme: the middle and rear axle assembly checking fixture comprises a base, a frame assembly, a balance suspension, a lower reaction rod assembly, a middle axle assembly, a rear axle assembly, an upper reaction rod assembly, a leaf spring assembly and a measuring platform, wherein the frame assembly is arranged on the base, the balance suspension is provided with two sides which are respectively fixedly arranged in the middle of the frame assembly, the balance suspension is connected with the middle axle assembly and the rear axle assembly through the lower reaction rod assembly, the leaf spring assembly is provided with two sides which are respectively arranged on the frame assembly, two ends of the leaf spring assembly are respectively fixed with the middle axle assembly and the rear axle assembly, the frame assembly is connected with the middle axle assembly and the rear axle assembly through the upper reaction rod assembly, and a supporting seat for supporting the upper reaction rod assembly and the lower reaction rod assembly is arranged on the measuring platform.

Preferably, the measuring platform is provided with five supporting seats, wherein two supporting seats are used for supporting the upper reaction rod assembly, two ends of the upper reaction rod assembly are supported by the two supporting seats, and the other three supporting seats are used for supporting the lower reaction rod assembly, and three ends of the lower reaction rod assembly are supported by the three supporting seats.

Preferably, an opening is arranged in the middle of the measuring platform, and the five supporting seats are arranged around the periphery of the opening.

Preferably, a gripper is arranged on the measuring platform.

Preferably, the lower reaction rod assembly comprises 4I rods, the connecting rod connecting part of each balance suspension is connected with two I rods front and back, one I rod is connected with the front axle assembly, the other I rod is connected with the rear axle assembly, the upper reaction rod assembly comprises 2V rods, the V rods are triangular, three connecting end parts are arranged on the V rods, two connecting end parts are connected with the connecting rod mounting seat on the frame assembly, and the other end part is connected with the front axle assembly or the rear axle assembly.

Preferably, the end of the I rod or the V rod is provided with a through hole, a joint is rotatably arranged in the through hole, two ends of the through hole are provided with end plate nuts in threaded connection with the through hole, two end parts of the joint penetrate through the end plate nuts, the end part of the joint is provided with a mounting hole, and mounting points connected with the joint are arranged on the front axle assembly and the rear axle assembly.

Preferably, the rear bumper assembly comprises a rear bumper rear support fixed at the rear end of the frame assembly, a bumper lower support fixed at the lower end of the frame assembly, a longitudinal sliding rail fixed on the rear bumper support, a transverse sliding rail fixed on the bumper lower support, a longitudinal sliding seat arranged on the longitudinal sliding rail in a sliding manner, a transverse sliding seat arranged on the transverse sliding rail in a sliding manner, an adjusting screw arranged on the rear bumper support in a rotatable manner, an upper bumper fixed on the longitudinal sliding seat, and an anti-rolling connecting rod and a lower bumper, wherein the central axis of the adjusting screw is parallel to the length direction of the longitudinal sliding rail, the adjusting screw is in threaded connection with the longitudinal sliding seat, one end of the anti-rolling connecting rod is hinged with the transverse sliding seat, the other end of the anti-rolling connecting rod is hinged with the upper bumper, and the top of the lower bumper is hinged with the bottom of the lower bumper.

Preferably, the rear bumper assembly further comprises a locking mechanism, the locking mechanism comprises an upper hook fixed on the upper bumper, a lower locking seat fixed on the lower bumper, a lower locking handle, an upper locking connecting rod, a locking ring, a loop bar and a locking spring, the top of the lower locking handle is hinged with the lower locking seat, the middle of the lower locking handle is hinged with the bottom of the upper locking connecting rod, the locking ring is hung on the upper hook, the loop bar is slidably arranged on the upper locking connecting rod, the locking spring is positioned between an upper locking connecting rod top plate and a bottom end plate of the loop bar, and the top of the loop bar is fixedly connected with the locking ring.

The detection method of the intermediate and rear axle assembly detection tool comprises the following steps:

step a, installing a balance suspension: two balance suspensions are respectively fixed on two side surfaces of the frame assembly and are tightened by screws;

step b, adjusting the angles of the end joints of the I rod and the V rod;

c, locking and fixing the end part of the I rod on a connecting rod mounting part of the balance suspension through a screw;

step d, installing a front axle assembly and a rear axle assembly, wherein the end part of the I rod is fixed on mounting points of the front axle assembly and the rear axle assembly through screws;

step e, fixing two ends of the leaf spring on the front axle assembly and the rear axle assembly;

and f, installing the V-shaped rod between the frame and the front axle assembly and between the frame and the rear axle assembly.

Preferably, in the step b, the I rod and the V rod are alternately placed on the measurement platform, clamped by the C-shaped clamp, the angle of the joint is adjusted and calibrated by matching an angle gauge, and the sleeve handle is used for rotating the end plate nut to calibrate the angle of the joint.

From the above description, the intermediate and rear axle assembly gauge provided by the utility model has the following beneficial effects: the standard frame assembly, the middle-rear axle assembly and the rear bumper assembly are matched with each other to verify whether the vehicle frame assembly is a frame problem or a quality problem of an axle, verify the assembly effect of the frame main body and the connecting pieces related to the middle-rear axle and the rear bumper, and play a role in guiding modification; the rear protection area can be matched, and mutual matching verification of accessories such as bumpers can be performed; the I pole and the V pole can be placed on the monitoring platform to calibrate the angle of the joint, and the operation is convenient and accurate.

Drawings

FIG. 1 is a side view of a rear axle assembly gauge of the present utility model.

FIG. 2 is a top view of the rear axle assembly gauge of the present utility model.

Fig. 3 is a schematic structural diagram of the measuring platform.

Fig. 4 is a schematic diagram of the use of the measurement platform.

Fig. 5 is a schematic diagram of the use of the measurement platform.

Fig. 6 is a schematic structural view of the I-bar.

Fig. 7 is a cross-sectional view of the end of the I-bar.

FIG. 8 is a side view of the rear axle assembly gauge of the present utility model.

FIG. 9 is a schematic structural view of the rear bumper assembly.

Fig. 10 is a schematic structural view of the locking mechanism.

Fig. 11 is a schematic structural view of the locking mechanism.

Detailed Description

The utility model is further described below by means of specific embodiments.

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

As shown in fig. 1 and 2, the rear axle assembly checking fixture in the utility model comprises a base 1, a frame assembly 2, a balance suspension 3, a lower reaction rod assembly 4, a middle axle assembly 5, a rear axle assembly 6, an upper reaction rod assembly 7, a leaf spring assembly 8 and a measuring platform 9, wherein the frame assembly 2 is arranged on the base 1, the balance suspension 3 is provided with two sides respectively fixedly arranged at the middle part of the frame assembly 2, the balance suspension 3 is connected with the middle axle assembly 5 and the rear axle assembly 6 through the lower reaction rod assembly 4, the leaf spring assembly 8 is provided with two sides respectively arranged at the two sides of the frame assembly 2, two ends of the leaf spring assembly 8 are respectively fixed with the middle axle assembly 5 and the rear axle assembly 6, the frame assembly 2, the middle axle assembly 5 and the rear axle assembly 6 are connected through the upper reaction rod assembly 7, and a supporting seat 91 for supporting the upper reaction rod assembly 7 and the lower reaction rod assembly 4 is arranged on the measuring platform 9. The measuring platform 9 is not installed on the frame assembly 2, but is used independently, the angle of the joint 41 is calibrated by the measuring platform 9 before the upper reaction rod assembly 7 and the lower reaction rod assembly 4 are installed on the frame assembly 2, the upper reaction rod assembly 7 or the lower reaction rod assembly 4 is placed on the supporting seat 91 and fixed by the C-shaped clamp, and then corresponding angle adjustment is carried out.

As shown in fig. 3 to 5, the measuring platform 9 is provided with five supporting seats 91, two of which 91 are used for supporting the upper reaction rod assembly 7, two ends of the upper reaction rod assembly 7 are supported by the two supporting seats 91, the other three supporting seats 91 are used for supporting the lower reaction rod assembly 4, and three ends of the lower reaction rod assembly 4 are supported by the three supporting seats 91.

The middle of the measuring platform 9 is provided with an opening 92, and five support seats 91 are arranged around the periphery of the opening 92. The opening 92 is used for facilitating the clamping of the C-shaped clamp, when the upper reaction rod assembly 7 or the lower reaction rod assembly 4 is placed on the supporting seat 91, the C-shaped clamp passes through the opening 92, the lower end of the C-shaped clamp is abutted against the bottom of the measuring platform 9, and the upper end is abutted against the upper reaction rod assembly 7 or the lower reaction rod assembly 4, so that the upper reaction rod assembly 7 or the lower reaction rod assembly 4 is fixed on the measuring platform 9, the use schematic diagram of the I rod is shown in fig. 4, and the use schematic diagram of the V rod is shown in fig. 5.

The measuring platform 9 is provided with a grip 93. The grippers 93 are located around the measuring platform 9, so that the measuring platform 9 can be conveniently carried.

As shown in fig. 6 and 7, the lower reaction rod assembly 4 includes 4I rods, two I rods are connected front and back to the connecting rod connecting portion of each of the balanced suspensions 3, one of the I rods is connected with the front axle assembly, the other one is connected with the rear axle assembly 6, the upper reaction rod assembly 7 includes 2V rods, each V rod is triangular, each V rod is provided with three connecting end portions, two connecting end portions are connected with the connecting rod mounting seat on the frame assembly 2, and the other end portion is connected with the front axle assembly or the rear axle assembly 6.

The end of the I pole or the V pole is provided with a through hole, as shown in the structural schematic diagrams of the I pole in fig. 6 and 7, a joint 41 is rotatably arranged in the through hole, two ends of the through hole are provided with end plate nuts 42 in threaded connection with the through hole, two ends of the joint 41 penetrate through the end plate nuts 42, the end part of the joint 41 is provided with a mounting hole, and mounting points connected with the joint 41 are arranged on the front axle assembly and the rear axle assembly 6. The I rod and the V rod are alternately placed on the measuring platform 9 and clamped by a C-shaped clamp, the angle of the joint 41 is adjusted and calibrated by matching an angle gauge, and the sleeve handle is adopted to rotate the end plate nut 42 so as to calibrate the angle of the joint 41. The joint 41 of the I rod or the V rod after the angle calibration is fixedly connected with the front axle assembly, the rear axle assembly 6, the balance suspension 3 and the frame assembly 2 through the installation hole of the joint 41 by punching bolts.

As shown in fig. 8-11, the middle-rear axle assembly inspection tool further comprises a rear bumper assembly 10, the rear bumper assembly 10 comprises a bumper rear bracket 101 fixed at the rear end of the frame assembly 2, a bumper lower bracket 102 fixed at the lower end of the frame assembly 2, a longitudinal sliding rail 103 fixed on the bumper rear bracket 101, a transverse sliding rail 104 fixed on the bumper lower bracket 102, a longitudinal sliding seat 105 arranged on the longitudinal sliding rail 103 in a sliding manner, a transverse sliding seat 106 arranged on the transverse sliding rail 104 in a sliding manner, an adjusting screw 107 rotatably arranged on the bumper rear bracket 101, an upper bumper 108 fixed on the longitudinal sliding seat 105, an anti-rolling connecting rod 109 and a lower bumper 1010, the central axis of the adjusting screw 107 is parallel to the longitudinal direction of the longitudinal sliding rail 103, the adjusting screw 107 is in threaded connection with the longitudinal sliding seat 105, one end of the anti-rolling connecting rod 109 is hinged with the transverse sliding seat 106, the other end is hinged with the upper bumper 108, and the top of the lower bumper 1010 is hinged with the bottom of the lower bumper 1010. The rear bumper assembly 10 is used for simulating the matching relation of various accessories of the rear bumper, wherein the triangular structure formed by the rear bumper, the anti-rolling connecting rod 109 and the frame assembly 2 has the function of preventing the rear-end collision of the rear automobile from rolling into the bottom of the automobile, and the stable supporting structure of the anti-rolling connecting rod 109 and the frame assembly 2 can effectively prevent the automobile from rolling into the automobile when the head of the rear-end collision vehicle is inserted into the rear bumper, further, after the head is embedded into the rear bumper, the anti-rolling connecting rod 109 sinks, so that the head is prevented from continuously rolling into the bottom of the automobile, the knob is arranged at the top of the adjusting screw 107, the longitudinal sliding movement is driven by rotating the adjusting screw 107, the lower bumper 1010 is driven to move up and down, and the transverse sliding seat 106 is driven by the anti-rolling connecting rod 109 to move along the transverse sliding rail 104, so that the different heights of the rear bumper and the corresponding angles of the anti-rolling connecting rod 109 and the frame assembly 2 are simulated. The lower bumper 1010 is located below the upper bumper 108, and is fixed or movable, so that the protection area of the rear bumper is increased when the lower bumper is in a fixed state, and the lower bumper rotates when the lower bumper collides with an object when the lower bumper is in a movable state, thereby improving the trafficability of the lower bumper.

The rear bumper assembly 10 further includes a locking mechanism including an upper hook 1011 fixed to the upper bumper 108, a lower locking seat 1012 fixed to the lower bumper 1010, a lower locking handle 1013, an upper locking link 1014, a locking ring 1015, a loop 1016 and a locking spring 1017, wherein the top of the lower locking handle 1013 is hinged to the lower locking seat 1012, the middle is hinged to the bottom of the upper locking link 1014, the locking ring 1015 is hung on the upper hook 1011, the loop 1016 is slidably disposed on the upper locking link 1014, the locking spring 1017 is located between the top plate of the upper locking link 1014 and the bottom end plate of the loop 1016, and the top of the loop 1016 is fixedly connected to the locking ring 1015. The locking mechanism is shown in a locking state, at this time, the upper bumper 108 and the lower bumper 1010 are in a relatively fixed state, the lower bumper 1010 cannot shake relatively to the upper bumper during running, the loop bar 1016 passes through the top of the upper locking link 1014 and is in sliding fit with the upper bumper, the locking spring 1017 is in a compressed state, and a lower pressure is applied to the loop bar 1016 and the locking ring 1015 under the action of elasticity, and a tensile force is applied to the lower upper locking link 1014 and the lower locking handle 1013, so that the locking ring 1015 is fastened on the upper hook 1011; when the lower bumper 1010 needs to be released, a certain outward torque is applied to the lower locking handle 1013 from the inside, so that the lower locking handle 1013 is driven to rotate, and the upper locking link 1014 is driven to rotate, so that the locking ring 1015 is separated from the upper hook 1011, and at this time, the lower bumper 1010 can rotate and move relative to the upper bumper 108.

The detection method of the intermediate and rear axle assembly gauge is characterized by comprising the following steps of:

step a, installing a balance suspension 3: two balance suspensions 3 are respectively fixed to two side surfaces of the frame assembly 2 and tightened by screws;

step b, adjusting the angles of the I rod and the V rod end joint 41;

c, locking and fixing the end part of the I rod on a connecting rod mounting part of the balance suspension 3 through a screw;

step d, installing a front axle assembly and a rear axle assembly 6, wherein the end part of the I rod is fixed on the installation points of the front axle assembly and the rear axle assembly 6 through screws;

step e, fixing two ends of the leaf spring on the front axle assembly and the rear axle assembly 6;

and f, installing the V-shaped rod between the frame and the front axle assembly and between the frame and the rear axle assembly 6.

In the step b, the I rod and the V rod are alternately placed on the measuring platform 9 and clamped by the C-shaped clamp, the angle of the joint 41 is adjusted and calibrated by matching an angle gauge, and the sleeve handle is adopted to rotate the end plate nut 42 to calibrate the angle of the joint 41.

The two side surfaces and the bottom surface of the frame assembly 2 are provided with support mounting points, the balance suspension 3 comprises a Y-shaped connecting part, a horizontal connecting part and a connecting rod connecting part, the mounting surfaces of the Y-shaped connecting part and the horizontal connecting part are vertical, the Y-shaped connecting part is fixedly arranged on the support mounting points of the side surface of the frame assembly 2, the horizontal connecting part is fixedly arranged on the support mounting points of the bottom surface of the frame assembly 2, and the connecting rod connecting part is connected with the lower reaction rod assembly 4.

A gasket is arranged between the horizontal connecting part and the bracket mounting point of the bottom surface of the frame assembly 2, and a gasket is arranged between the connecting rod connecting part and the lower reaction rod assembly 4.

The two ends of the leaf spring assembly 8 are respectively arranged on the front axle assembly and the rear axle assembly 6, the front axle assembly and the rear axle assembly 6 are provided with mounting hooks for being connected with the leaf spring assembly 8, the end parts of the leaf spring assembly 8 are embedded into the mounting hooks and are fixedly connected with the front axle assembly or the rear axle assembly 6 through screws, the side surface of the frame assembly 2 is fixedly provided with a spring fixing connecting plate, the spring fixing connecting plate is provided with a spring fixing nut, the spring fixing nut is internally provided with a spring fixing rod in threaded connection with the spring fixing nut, and the spring fixing rod is abutted against the side surface of the end part of the leaf spring assembly 8.

The frame assembly 2 is provided with connecting rod installation seats, the connecting rod installation seats are connected with the intermediate axle assembly 5 and the rear axle assembly 6 through upper reaction rod assemblies 7, the connecting rod installation seats are four, and gaskets are arranged between the connecting rod installation seats and the frame assembly 2.

In the step a, a gasket is arranged between a horizontal connecting part of the balance suspension 3 and a bracket mounting point on the bottom surface of the frame assembly 2, when the deformation is required to be measured, the gasket between the horizontal connecting part and the bracket mounting point on the bottom surface of the frame assembly 2 is replaced by oil sludge, and the deformation of the oil sludge is measured after locking; a gasket is arranged between the connecting part of the connecting rod and the lower reaction rod assembly 4, and the X-direction distance is adjusted when the I rod is installed by adjusting the thickness of the gasket;

in the step b, when the mounting holes of the joints 41 of the I rod and the V rod deviate from the mounting point holes of the balance suspension 3 or the front axle assembly and the rear axle assembly 6, the I rod and the V rod are alternately placed on the measuring platform 9 and clamped by C; the end plate nut 42 is rotated through the sleeve handle, and the joint 41 is moved through the left-right movement of the end plate nut 42, so that the mounting holes are aligned;

in step e, embedding the end part of the leaf spring assembly 8 into the mounting hook, rotating and spring fixing rods until the end part of the leaf spring fixing rods abuts against the side surface of the end part of the leaf spring assembly 8, and preventing the leaf spring from rotating in the screw tightening process;

in the step f, the Z position of the connecting rod mounting seat is adjusted to adapt to the mounting of V rods with different configurations;

the standard frame assembly 2, the middle rear axle assembly 6 and the rear bumper assembly are matched with each other to verify whether the vehicle frame is a frame problem or a quality problem of an axle, verify the assembly effect of the frame main body and the connecting pieces related to the middle rear axle and the rear bumper, and play a role in guiding modification; the rear protection area can be matched, and mutual matching verification of accessories such as bumpers can be performed; the I pole and V pole can be placed on monitoring platform and connect 41's angle calibration, the simple operation is accurate.

The foregoing is merely a few specific embodiments of the present utility model, but the design concept of the present utility model is not limited thereto, and any insubstantial modification of the present utility model by using the concept should be construed as infringement of the protection scope of the present utility model.

Claims (8)

1. Middle and rear axle assembly examines utensil, its characterized in that: the device comprises a base, a frame assembly, a balance suspension, a lower reaction rod assembly, a middle bridge assembly, a rear axle assembly, an upper reaction rod assembly, a leaf spring assembly and a measuring platform, wherein the frame assembly is arranged on the base, the balance suspension is provided with two sides which are respectively fixedly arranged at the middle part of the frame assembly, the balance suspension is connected with the middle bridge assembly and the rear axle assembly through the lower reaction rod assembly, the leaf spring assembly is provided with two sides which are respectively arranged on the frame assembly, two ends of the leaf spring assembly are respectively fixed with the middle bridge assembly and the rear axle assembly, the frame assembly is connected with the middle bridge assembly and the rear axle assembly through the upper reaction rod assembly, and a supporting seat which is used for supporting the upper reaction rod assembly and the lower reaction rod assembly is arranged on the measuring platform.

2. The mid-rear axle assembly gauge of claim 1, wherein: the measuring platform is provided with five supporting seats, wherein two supporting seats are used for supporting the upper reaction rod assembly, two ends of the upper reaction rod assembly are supported through the two supporting seats, and the other three supporting seats are used for supporting the lower reaction rod assembly, and three ends of the lower reaction rod assembly are supported through the three supporting seats.

3. The mid-rear axle assembly gauge of claim 2, wherein: an opening is arranged in the middle of the measuring platform, and the five supporting seats are arranged around the opening.

4. The mid-rear axle assembly gauge of claim 1, wherein: and a gripper is arranged on the measurement platform.

5. The mid-rear axle assembly gauge of claim 1, wherein: the lower reaction rod assembly comprises 4I rods, the connecting rod connecting part of each balance suspension is connected with two I rods front and back, one of the I rods is connected with the front axle assembly, the other I rod is connected with the rear axle assembly, the upper reaction rod assembly comprises 2V rods which are triangular, the V rods are provided with three connecting end parts, two connecting end parts are connected with the connecting rod mounting seat on the frame assembly, and the other end part is connected with the front axle assembly or the rear axle assembly.

6. The mid-rear axle assembly gauge of claim 5, wherein: the end of I pole or V pole is equipped with the through-hole, rotationally be equipped with the joint in the through-hole, the both ends of through-hole be equipped with rather than threaded connection's end plate nut, connect two ends pass end plate nut, the tip of joint is equipped with the mounting hole, all be equipped with the mounting point of being connected with the joint on front axle assembly and the rear axle assembly.

7. The mid-rear axle assembly gauge of claim 1, wherein: the rear bumper assembly comprises a bumper rear support fixed at the rear end of the frame assembly, a bumper lower support fixed at the lower end of the frame assembly, a longitudinal sliding rail fixed on the bumper rear support, a transverse sliding rail fixed on the bumper lower support, a longitudinal sliding seat arranged on the longitudinal sliding rail in a sliding mode, a transverse sliding seat arranged on the transverse sliding rail in a sliding mode, an adjusting screw arranged on the bumper rear support in a rotatable mode, an upper bumper fixed on the longitudinal sliding seat, an anti-rolling connecting rod and a lower bumper, the central axis of the adjusting screw is parallel to the length direction of the longitudinal sliding rail, the adjusting screw is in threaded connection with the longitudinal sliding seat, one end of the anti-rolling connecting rod is hinged to the transverse sliding seat, the other end of the adjusting screw is hinged to the upper bumper, and the top of the lower bumper is hinged to the bottom of the lower bumper.

8. The mid-rear axle assembly gauge of claim 7, wherein: the rear bumper assembly further comprises a locking mechanism, the locking mechanism comprises an upper hook fixed on the upper bumper, a lower locking seat fixed on the lower bumper, a lower locking handle, an upper locking connecting rod, a locking ring, a loop bar and a locking spring, the top of the lower locking handle is hinged with the lower locking seat, the middle of the lower locking handle is hinged with the bottom of the upper locking connecting rod, the locking ring is hung on the upper hook, the loop bar is slidably arranged on the upper locking connecting rod, the locking spring is positioned between a top plate of the upper locking connecting rod and a bottom end plate of the loop bar, and the top of the loop bar is fixedly connected with the locking ring.