CN109100137B

CN109100137B - NVH of rear axle reduction gear rolls off production line and detects platform

Info

Publication number: CN109100137B
Application number: CN201810752521.0A
Authority: CN
Inventors: 王洪明; 兰家水; 刘清泉; 郭永
Original assignee: Chongqing University Of Technology & Tsinghua Automotive Research Institute & Linktron Measurement And Control Technology Co ltd
Current assignee: Chongqing University Of Technology & Tsinghua Automotive Research Institute & Linktron Measurement And Control Technology Co ltd
Priority date: 2018-07-10
Filing date: 2018-07-10
Publication date: 2020-12-08
Anticipated expiration: 2038-07-10
Also published as: CN109100137A

Abstract

The invention discloses an NVH offline detection platform of a rear axle speed reducer, which comprises a rear axle box component matched with the speed reducer to be tested, a driving system for simulating the driving force of an actual vehicle and a loading system for simulating the loading working condition of the actual vehicle; the driving system comprises a driving end rack and a driving assembly arranged on the driving end rack, and the loading system comprises a loading end rack and a loading assembly arranged on the loading end rack; the driving end rack comprises a driving end base, a lifting plate, a horizontal sliding plate and a driving bottom plate; the lifting plate is arranged on the drive end base through a lifting mechanism, and a first linear sliding mechanism is arranged between the horizontal sliding plate and the lifting plate; a second linear sliding mechanism is arranged between the driving bottom plate and the horizontal sliding plate; the loading end rack comprises a loading end base and a loading bottom plate which are sequentially arranged from bottom to top, and a linear moving mechanism is arranged between the lower surface of the loading bottom plate and the loading end base. The invention has the advantages of reasonable structural design, suitability for rear axle reducers with different sizes and the like.

Description

NVH of rear axle reduction gear rolls off production line and detects platform

Technical Field

The invention relates to the technical field of NVH detection, in particular to an NVH offline detection platform of a rear axle speed reducer.

Background

NVH is an english abbreviation for Noise, Vibration and Harshness (Noise, Vibration, Harshness). It is a comprehensive problem in measuring the quality of automobile manufacture, and it gives the automobile user the most direct and surface feeling. The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry. Statistics show that 1/3 failure problem of the whole automobile is related to NVH problem of the automobile, and nearly 20% of research and development cost of each large company is consumed for solving the NVH problem of the automobile.

The rear axle reduction gear is the essential element of car, is responsible for the transmission of power, also brings the noise for whole car simultaneously, and in the course of operation of reduction gear, the unusual of any one part all can lead to the reduction gear unusual of work to lead to the reduction gear to produce the noise, to reduction gear manufacturing enterprise, it is very necessary to carry out NVH offline detection to the reduction gear. However, the models of the rear axle speed reducers produced by each speed reducer manufacturing enterprise are various, and the mounting sizes of the rear axle speed reducers of different models are different, so that how to enable the NVH offline detection platform to be applicable to the rear axle speed reducers of different models becomes a problem to be solved urgently.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a structural design is reasonable, can be applicable to the NVH of the rear axle reduction gear of not unidimensional and rolls off production line and examine test table.

In order to solve the technical problems, the invention adopts the following technical scheme:

the NVH offline detection table of the rear axle speed reducer is characterized by comprising a rear axle box body assembly matched with the speed reducer to be tested, wherein the rear axle box body assembly is provided with a differential mechanism with the same differential mechanism parameters as those matched with a real vehicle of the speed reducer to be tested, one side of the rear axle box body assembly, which is positioned at the input end of the differential mechanism, is a mounting side for mounting the differential mechanism to be tested, and when the speed reducer to be tested is mounted on the mounting side, the output shaft of the speed reducer to be tested is coaxially connected with the input end of the differential mechanism; the device also comprises a driving system which is used for being connected with the input end of the speed reducer to be tested and simulating the driving force of the real vehicle and two loading systems which are respectively connected with the output end of the differential and simulate the loading working condition of the real vehicle; the driving system comprises a driving end rack arranged on the side where the input end of the differential mechanism is located, and a driving assembly axially mounted on the driving end rack along the input end of the differential mechanism, wherein the output end of the driving assembly can be coaxially connected with the input end of a speed reducer to be tested; the loading system comprises a loading end rack arranged on the side of the output end of the differential, and a loading assembly axially mounted on the loading end rack along the output end of the differential, wherein the output end of the loading assembly is coaxially connected with the output end of the differential; the driving end rack comprises a driving end base, a lifting plate, a horizontal sliding plate and a driving bottom plate which are sequentially arranged from bottom to top; the lifting plate is arranged on the driving end base in a lifting mode through a lifting mechanism, and a first linear sliding mechanism is arranged between the lower surface of the horizontal sliding plate and the lifting plate, so that the horizontal sliding plate can horizontally move relative to the lifting plate along the direction perpendicular to the input shaft of the differential; a second linear sliding mechanism is arranged between the lower surface of the driving bottom plate and the horizontal sliding plate, so that the driving bottom plate can horizontally move relative to the horizontal sliding plate along the direction of the input shaft of the differential; the loading end rack comprises a loading end base and a loading bottom plate which are sequentially arranged from bottom to top, and a linear moving mechanism is arranged between the lower surface of the loading bottom plate and the loading end base, so that the loading bottom plate can horizontally move relative to the loading end base along the direction of an output shaft of the differential mechanism.

By adopting the structure, during detection, the speed reducer to be tested is installed on the rear axle box body assembly, and then the input end of the speed reducer to be tested is coaxially connected with the output end of the driving assembly to be tested, so that the test can be carried out. For the speed reducers of different models, only the rear axle box body assembly needs to be replaced, the mounting size of the rear axle box body assembly is matched with the speed reducer, and the differential parameters of the rear axle box body assembly are consistent with those of the differential mechanism matched with the actual speed reducer to be tested. For the rear axle box body assemblies matched with the speed reducers of different models, the distance between two output ends of the differential mechanism can be changed, but the loading bottom plate can horizontally move relative to the loading end base along the output shaft direction of the differential mechanism under the action of the linear moving mechanism, so that the loading assembly arranged on the loading end rack can move along the output shaft direction of the differential mechanism along with the loading bottom plate, and the size of the rear axle box body assemblies corresponding to the speed reducers of different models is adapted. And the position change of the input ends of the speed reducers of different models can be respectively adjusted through the lifting mechanism, the first linear sliding mechanism and the second linear sliding mechanism, so that the output end of the driving assembly can be coaxially connected with the input end of the speed reducer to be tested. Like this, through the structure of above-mentioned rational design for examine test table and can be applicable to the rear axle reduction gear of different models unidimensional.

Furthermore, a loading bottom plate locking mechanism is further arranged between the loading bottom plate and the loading end base and comprises a loading locking plate and a disc brake, the loading locking plate is vertically installed on the loading bottom plate, the disc brake is installed on the loading end base, the loading locking plate is arranged in the moving direction of the loading bottom plate, and the lower end of the loading locking plate extends into a brake groove of the disc brake.

By adopting the structure, the loading locking plate can be tightly held through the disc brake, so that the loading bottom plate is fixed relative to the loading end base, the integral rigidity of the loading end rack is favorably increased, the influence on a detection result caused by the vibration of the loading end rack in the detection process is avoided, and the accuracy of the detection result is favorably improved.

Furthermore, the linear moving mechanism comprises two parallel linear moving guide rails which are arranged on the upper surface of the loading end base in an opposite mode, and a linear moving sliding block which can be matched with the linear moving guide rails in a sliding mode, and the loading base plate is fixedly installed on the linear moving sliding block.

Further, a linear driving mechanism is arranged between the loading bottom plate and the loading end base, the linear driving mechanism comprises a linear moving screw rod arranged along the moving direction of the loading bottom plate and a linear moving screw rod nut matched on the linear moving screw rod, two ends of the linear moving screw rod are rotatably arranged on the loading end base through bearing supports, and one end of the linear moving screw rod is coaxially connected with a linear moving driving motor; the loading bottom plate is fixedly connected with the linear moving screw rod nut.

Therefore, the linear movement driving motor can be used for driving the linear movement screw rod to rotate, and the rotary motion of the linear movement screw rod is converted into the linear motion of the linear movement screw rod nut by the screw rod nut pair, so that the movement of the loading bottom plate is controlled. When the linear moving screw rod rotates for one circle, the linear moving distance of the linear moving screw rod nut is the lead of the linear moving screw rod, so that the moving distance of the loading bottom plate can be adjusted by controlling the rotating angle of the linear moving screw rod, and the adjustment is more convenient and accurate.

Further, the lifting mechanism comprises a vertical guide mechanism and a lifting driving mechanism, the vertical guide mechanism comprises a guide post vertically installed below the lifting plate and a linear bearing installed on the driving end base, the lower end of the guide post slidably penetrates through the linear bearing, and the distance from the linear bearing to the ground is greater than the length of the guide post; the lifting driving mechanism comprises a worm and gear reducer installed on the driving end base, the output end of the worm and gear reducer is vertically arranged upwards and is connected with a lifting screw rod, the upper end of the lifting screw rod penetrates through the lifting plate, a lifting screw rod nut is arranged on the lifting screw rod in a matched mode, and the lifting screw rod nut is fixedly installed on the lifting plate; the input end of the worm gear reducer is connected with a lifting driving motor.

Furthermore, the vertical guide mechanisms are provided with two rows in the width direction of the lifting plate, and each row is provided with three vertical guide mechanisms; the lifting driving mechanisms are arranged in two in the length direction of the lifting plate.

Further, vertical guiding mechanism still including installing vertical cavity air chuck on the drive end base, vertical cavity air chuck is coaxial to be set up linear bearing's top, the guide post passes vertical cavity air chuck.

Like this, can utilize vertical cavity pneumatic chuck to hold guide post tightly to realize the locking of lifter plate, be favorable to improving the rigidity of being connected between lifter plate and the drive end base, the vibration of lifter plate when reducing the detection is favorable to improving the accuracy nature that detects.

Furthermore, the first linear sliding mechanism comprises a first linear guiding mechanism and a first sliding driving mechanism, the first linear guiding mechanism comprises three first linear sliding guide rails which are arranged on the upper surface of the lifting plate side by side along the length direction of the lifting plate, and a first linear sliding slide block which is slidably matched with the first linear sliding guide rails, and the horizontal sliding plate is fixedly arranged on the first linear sliding slide block; the first sliding driving mechanism comprises a first linear sliding screw rod arranged in parallel with the first linear sliding guide rail and a first linear sliding screw rod nut matched with the first linear sliding screw rod, two ends of the first linear sliding guide rail are rotatably arranged on the lifting plate through bearing supports, and one end of the first linear sliding guide rail is coaxially connected with a first sliding driving motor; the horizontal sliding plate is fixedly connected with the first linear sliding screw rod nut.

Further, the second linear sliding mechanism comprises a second linear guide mechanism and a second sliding driving mechanism, the second linear guide mechanism comprises two second linear sliding guide rails which are arranged on the upper surface of the horizontal sliding plate side by side along the width direction of the lifting plate, and a second linear sliding slide block which is slidably matched with the second linear sliding guide rails, and the driving bottom plate is fixedly arranged on the second linear sliding slide block; the second sliding driving mechanism comprises a second linear sliding screw rod arranged in parallel with the second linear sliding guide rail and a second linear sliding screw rod nut matched with the second linear sliding screw rod, two ends of the second linear sliding guide rail are rotatably arranged on the horizontal sliding plate through bearing supports, and two ends of the second linear sliding guide rail are coaxially connected with a second sliding driving motor; the driving bottom plate is fixedly connected with the second linear sliding screw rod nut.

Further, drive assembly is including the driving motor, rotational speed torque sensor and the drive bearing frame that connect gradually the setting, the middle part of drive bearing frame has rotatable drive connecting axle, driving motor's axle head pass through the shaft coupling with rotational speed torque sensor's one end coaxial coupling, rotational speed torque sensor's the other end pass through the shaft coupling with drive connecting axle coaxial coupling.

In conclusion, the rear axle speed reducer has the advantages of being reasonable in structural design, capable of being suitable for rear axle speed reducers of different sizes and the like.

Drawings

Fig. 1 is a schematic structural diagram of an NVH offline detection table of the device.

Fig. 2 is a schematic structural diagram of a rear axle box assembly in fig. 1.

Fig. 3 is a schematic structural diagram of the driving system in fig. 1.

Fig. 4 is a schematic structural diagram of the loading system in fig. 1.

FIG. 5 is a schematic structural view of the loading spline shaft.

Fig. 6 is a schematic structural diagram of the annular retainer ring.

Detailed Description

The present invention will be described in further detail with reference to examples.

In the specific implementation: as shown in fig. 1 to 6, an offline NVH test platform for a rear axle speed reducer comprises a rear axle box assembly 1 matched with the speed reducer to be tested, wherein the rear axle box assembly 1 is provided with a differential mechanism with parameters consistent with those of the differential mechanism matched with a real vehicle of the speed reducer to be tested, one side of the rear axle box assembly 1, which is positioned at the input end of the differential mechanism, is a mounting side for mounting the differential mechanism to be tested, so that when the speed reducer to be tested is mounted on the mounting side, an output shaft of the speed reducer to be tested is coaxially connected with the input end of the differential mechanism; the device also comprises a driving system 2 which is used for being connected with the input end of the speed reducer to be tested and simulating the driving force of the real vehicle and two loading systems 3 which are respectively connected with the output end of the differential and simulate the loading working condition of the real vehicle; the driving system 2 comprises a driving end rack 21 arranged on the side of the input end of the differential, and a driving assembly 22 axially mounted on the driving end rack 21 along the input end of the differential, wherein the output end of the driving assembly 22 can be coaxially connected with the input end of a speed reducer to be tested; the loading system 3 comprises a loading end rack 31 arranged on the side of the output end of the differential, and a loading assembly 32 axially mounted on the loading end rack 31 along the output end of the differential, wherein the output end of the loading assembly 32 is coaxially connected with the output end of the differential; the driving end rack 21 comprises a driving end base 211, a lifting plate 212, a horizontal sliding plate 213 and a driving bottom plate 214 which are sequentially arranged from bottom to top; the lifting plate 212 is arranged on the driving end base 211 in a lifting way through a lifting mechanism 215, and a first linear sliding mechanism 216 is arranged between the lower surface of the horizontal sliding plate 213 and the lifting plate 212, so that the horizontal sliding plate 213 can horizontally move relative to the lifting plate 212 along the direction perpendicular to the input shaft of the differential; a second linear sliding mechanism 217 is provided between the lower surface of the drive base plate 214 and the horizontal sliding plate 213, so that the drive base plate 214 can move horizontally relative to the horizontal sliding plate 213 along the input shaft direction of the differential; the loading end rack 31 comprises a loading end base 311 and a loading bottom plate 312 which are sequentially arranged from bottom to top, wherein a linear moving mechanism 313 is arranged between the lower surface of the loading bottom plate 312 and the loading end base 311, so that the loading bottom plate 312 can horizontally move relative to the loading end base 311 along the direction of the output shaft of the differential.

In implementation, a loading base plate locking mechanism 314 is further disposed between the loading base plate 312 and the loading end base 311, the loading base plate locking mechanism 314 includes a loading locking plate vertically installed on the loading base plate 312 and a disc brake installed on the loading end base 311, the loading locking plate is disposed along a moving direction of the loading base plate 312, and a lower end of the loading locking plate extends into a braking groove of the disc brake.

In implementation, the linear moving mechanism 313 includes two parallel linear moving guide rails facing the upper surface of the loading end base 311, and a linear moving slider slidably engaged with the linear moving guide rails, and the loading base plate 312 is fixedly mounted on the linear moving slider.

In implementation, a linear driving mechanism is further arranged between the loading base plate 312 and the loading end base 311, the linear driving mechanism includes a linear moving screw rod arranged along the moving direction of the loading base plate 312 and a linear moving screw rod nut matched on the linear moving screw rod, two ends of the linear moving screw rod are rotatably mounted on the loading end base 311 through a bearing support, and one end of the linear moving screw rod is coaxially connected with a linear moving driving motor; the loading base plate 312 is fixedly connected to the linear motion feed screw nut.

In practice, four loading base plate locking mechanisms 314 are provided, and are respectively located at four corners of the loading base plate 312.

In implementation, the loading assembly 32 includes a loading motor 321 and a loading bearing seat 322 installed on the loading base plate 312, a rotatable loading connecting shaft is provided in the middle of the loading bearing seat 322, and a shaft end of the loading motor 321 is coaxially connected with the loading connecting shaft through a coupling; the other end of the loading connecting shaft is connected with the output end of the rear axle box body component 1 through a loading connecting mechanism 4.

During implementation, the loading connection mechanism 4 includes a loading spline housing 41 coaxially installed on the other end of the loading connection shaft, a loading spline shaft 42 for connecting the rear axle box assembly 1 is inserted into the loading spline housing 41, one end of the loading spline shaft 42 has an external spline matched with the internal spline of the loading spline housing 41, and the other end has an external spline matched with the internal spline of the output end of the rear axle box assembly.

In practice, the loading spline housing 41 and the loading connecting shaft are provided with flanges extending outwards in the radial direction at the connecting end, and are fixedly connected through bolts.

In implementation, the loading spline shaft 42 includes a main shaft body 421, one end of the main shaft body 421 has an external spline matching with the internal spline of the loading spline housing 41, the other end is a stepped shaft with a smaller diameter, and the end of the stepped shaft has an external spline; a spline connecting sleeve 422 is slidably sleeved on the external spline of the step shaft, an inner hole of the spline connecting sleeve 422 is provided with an internal spline matched with the external spline of the step shaft, and the outer wall of the spline connecting sleeve 422 is provided with an external spline matched with the internal spline at the output end of the rear axle box assembly; the step shaft is further sleeved with a return spring (not shown in the figure), two ends of the return spring are respectively abutted against the step surface of the main shaft body 421 and the end part of the spline connecting sleeve 422, and when the return spring is in a natural state, the outer end of the spline connecting sleeve 422 is flush with the end part of the step shaft.

Therefore, when the output ends of the loading spline shaft and the rear axle box assembly are connected, even if the external splines of the spline connecting sleeve are not aligned with the internal splines of the output end of the rear axle box assembly, the spline connecting sleeve only can be caused to compress the reset spring, and once the spline connecting sleeve rotates, the spline connecting sleeve can be extruded into the internal splines of the output end of the rear axle box assembly under the thrust action of the reset spring to complete connection.

During implementation, the end of the step shaft is further provided with a coaxially installed circular baffle, and the diameter of the circular baffle is larger than the minimum inner diameter of the spline connecting sleeve 422 and smaller than the minimum diameter of the external spline of the spline connecting sleeve 422.

Therefore, the spline connecting sleeve can be prevented from falling off from the step shaft, and can be smoothly inserted into an internal spline of the output end of the rear axle box body assembly, so that spline connection transmission is realized.

During implementation, the outer end face of the spline connecting sleeve 422 is provided with a coaxially arranged annular groove, one side of the annular groove, which is inward along the radial direction, is communicated with the inner hole of the spline connecting sleeve 422, the depth of the annular groove is consistent with the thickness of the circular baffle, and the diameter of the annular groove is consistent with the diameter of the circular baffle.

When the step shaft is implemented, the end part of the step shaft is provided with two threaded holes which are arranged along the axial direction, the circular baffle is provided with two bolt holes which are arranged corresponding to the threaded holes, and the circular baffle is fixed on the threaded holes of the step shaft through bolts which penetrate through the bolt holes.

Because the end of the step shaft is provided with two threaded holes, at least one threaded hole is in a position deviated from the axial center. Therefore, in the rotating process of the loading connecting shaft, the phenomenon that the two bolts are loosened can be prevented, and the connecting reliability is improved.

When the step shaft structure is implemented, the axis connecting line of the two threaded holes is intersected with the axis of the step shaft, and the distances from the axis connecting line of the two threaded holes to the axis of the step shaft are equal.

Thus, the manufacturing and the installation are convenient.

In implementation, one outward end of the external spline of the spline connecting sleeve 422 is provided with a chamfer of 45-60 degrees.

Thus, the spline connecting sleeve can be well centered and inserted into the internal spline in the rotating process by utilizing the chamfer.

In implementation, an outer circular surface of one end of the main shaft body 421, which is away from the step shaft, is further provided with a coaxially arranged annular limiting groove, an outer spline of the end extends to the annular limiting groove, and the minimum diameter of the annular limiting groove is smaller than that of the outer spline of the end; an annular check ring is sleeved on the annular limiting groove, and an inner hole of the annular check ring is provided with an inner spline matched with the outer spline of the end, so that when the inner spline of the annular check ring rotates to a position corresponding to the outer spline of the end, the annular check ring can be taken down from the spindle body 421; the annular retainer ring is fixed on the loading spline housing 41 through bolts, and in an assembly state, the internal splines of the annular retainer ring and the loading spline housing are staggered.

In practice, the lifting mechanism 215 includes a vertical guiding mechanism and a lifting driving mechanism, the vertical guiding mechanism includes a guiding column vertically installed below the lifting plate 212, and a linear bearing installed on the driving end base 211, the lower end of the guiding column slidably passes through the linear bearing, and the distance from the linear bearing to the ground is greater than the length of the guiding column; the lifting driving mechanism comprises a worm and gear reducer installed on the driving end base 211, the output end of the worm and gear reducer is vertically arranged upwards and is connected with a lifting screw rod, the upper end of the lifting screw rod penetrates through the lifting plate 211, a lifting screw rod nut which is arranged in a matched mode is arranged on the lifting screw rod, and the lifting screw rod nut is fixedly installed on the lifting plate 211; the input end of the worm gear reducer is connected with a lifting driving motor.

In practice, the vertical guide mechanism is provided with two rows in the width direction of the lifting plate 212, and each row is provided with three rows; the two lifting driving mechanisms are provided in the longitudinal direction of the lifting plate 212.

During implementation, vertical guide mechanism is still including installing vertical cavity air chuck on drive end base 211, vertical cavity air chuck is coaxial to be set up linear bearing's top, the guide post passes vertical cavity air chuck.

In practice, the first linear sliding mechanism 216 includes a first linear guiding mechanism and a first sliding driving mechanism, the first linear guiding mechanism includes three first linear sliding guide rails arranged side by side on the upper surface of the lifting plate 212 along the length direction of the lifting plate 212, and a first linear sliding block slidably fitted on the first linear sliding guide rails, and the horizontal sliding plate 213 is fixedly mounted on the first linear sliding block; the first sliding driving mechanism comprises a first linear sliding screw rod arranged in parallel with the first linear sliding guide rail and a first linear sliding screw rod nut matched with the first linear sliding screw rod, two ends of the first linear sliding guide rail are rotatably arranged on the lifting plate 212 through bearing supports, and one end of the first linear sliding guide rail is coaxially connected with a first sliding driving motor; the horizontal sliding plate 213 is fixedly connected to the first linear sliding feed screw nut.

In practice, the second linear sliding mechanism 217 includes a second linear guiding mechanism and a second sliding driving mechanism, the second linear guiding mechanism includes two second linear sliding rails arranged side by side on the upper surface of the horizontal sliding plate 213 along the width direction of the lifting plate 212, and a second linear sliding block slidably fitted on the second linear sliding rails, and the driving base plate 214 is fixedly mounted on the second linear sliding block; the second sliding driving mechanism comprises a second linear sliding screw rod arranged in parallel with the second linear sliding guide rail and a second linear sliding screw rod nut matched with the second linear sliding screw rod, two ends of the second linear sliding guide rail are rotatably arranged on the horizontal sliding plate 213 through bearing supports, and two ends of the second linear sliding guide rail are coaxially connected with a second sliding driving motor; the driving base plate 214 is fixedly connected with the second linear sliding lead screw nut.

During implementation, drive assembly 22 is including connecting gradually driving motor 221, rotational speed torque sensor 222 and the drive bearing seat 223 that sets up, the middle part of drive bearing seat 223 has rotatable drive connecting axle, driving motor 221's axle head pass through the shaft coupling with rotational speed torque sensor 222's one end coaxial coupling, rotational speed torque sensor 222's the other end pass through the shaft coupling with drive connecting axle coaxial coupling.

In practice, the speed and torque sensor 222 is a digital torque sensor T40B with a magnetic pole speed measurement system.

In implementation, the rear axle box assembly 1 comprises a box body 11 provided with the differential, and the box body 11 is provided with a mounting through hole which is coaxially arranged corresponding to the output end of the differential and is used for a shaft to pass through; the outer side of the box body 11 is also provided with a supporting pipe for installing the device; the rear axle box body assembly 1 further comprises a supporting seat arranged corresponding to the supporting tube, and the supporting tube of the box body 11 is rotatably arranged on the supporting seat through a bearing.

In practice, the rear axle housing assembly 1 further comprises a swing drive 12 mounted on one of the support tubes, which support tube passes through the swing drive 12.

In implementation, the rear axle box assembly 1 further includes a locking disc 13 mounted on the other support tube, and a disc brake mounted on the support seat, and an outer side edge of the locking disc 13 is located in a brake groove of the disc brake.

In practice, three disc brakes are arranged along the circumferential direction of the locking disc 13.

Therefore, the locking force can be more uniform, and the locking is more stable.

In implementation, the rotation driving device 12 includes a worm and gear speed reducing mechanism, the supporting tube is installed on the output end of the worm and gear speed reducing mechanism, and the input end of the worm and gear speed reducing mechanism is connected with the servo motor.

During implementation, the upper end and the lower end of the box body 11 are respectively provided with two pressing mechanisms 14, each pressing mechanism 14 comprises a corner oil cylinder arranged along the direction of the input shaft of the differential, and the end part of each corner oil cylinder is provided with a pressing plate vertically arranged, so that the pressing plate can press the speed reducer to be tested when turning to the middle part of the box body 11.

The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The NVH offline detection platform of the rear axle speed reducer is characterized by comprising a rear axle box body assembly (1) matched with the speed reducer to be tested, wherein the rear axle box body assembly (1) is provided with a differential mechanism with the same differential mechanism parameters as those matched with a real vehicle of the speed reducer to be tested, one side, located at the input end of the differential mechanism, of the rear axle box body assembly (1) is a mounting side for mounting the differential mechanism to be tested, and when the speed reducer to be tested is mounted on the mounting side, the output shaft of the speed reducer to be tested is coaxially connected with the input end of the differential mechanism; the device also comprises a driving system (2) which is used for being connected with the input end of the speed reducer to be tested and simulating the driving force of the real vehicle and two loading systems (3) which are respectively connected with the output end of the differential and simulate the loading working condition of the real vehicle; the driving system (2) comprises a driving end rack (21) arranged on the side of the input end of the differential, and a driving assembly (22) axially mounted on the driving end rack (21) along the input end of the differential, wherein the output end of the driving assembly (22) can be coaxially connected with the input end of a speed reducer to be tested; the loading system (3) comprises a loading end rack (31) arranged on the side of the output end of the differential, and a loading assembly (32) axially mounted on the loading end rack (31) along the output end of the differential, wherein the output end of the loading assembly (32) is coaxially connected with the output end of the differential; the driving end rack (21) comprises a driving end base (211), a lifting plate (212), a horizontal sliding plate (213) and a driving bottom plate (214) which are sequentially arranged from bottom to top; the lifting plate (212) is arranged on the driving end base (211) in a lifting mode through a lifting mechanism (215), a first linear sliding mechanism (216) is arranged between the lower surface of the horizontal sliding plate (213) and the lifting plate (212), and the horizontal sliding plate (213) can move horizontally relative to the lifting plate (212) along the direction perpendicular to the input shaft of the differential; a second linear sliding mechanism (217) is arranged between the lower surface of the driving bottom plate (214) and the horizontal sliding plate (213), so that the driving bottom plate (214) can horizontally move relative to the horizontal sliding plate (213) along the direction of the input shaft of the differential; the loading end rack (31) comprises a loading end base (311) and a loading bottom plate (312) which are sequentially arranged from bottom to top, and a linear moving mechanism (313) is arranged between the lower surface of the loading bottom plate (312) and the loading end base (311) to enable the loading bottom plate (312) to horizontally move relative to the loading end base (311) along the direction of an output shaft of the differential;

a loading bottom plate locking mechanism (314) is further arranged between the loading bottom plate (312) and the loading end base (311), the loading bottom plate locking mechanism (314) comprises a loading locking plate vertically installed on the loading bottom plate (312) and a disc brake installed on the loading end base (311), the loading locking plate is arranged along the moving direction of the loading bottom plate (312), and the lower end of the loading locking plate extends into a braking groove of the disc brake;

the lifting mechanism (215) comprises a vertical guide mechanism and a lifting driving mechanism, the vertical guide mechanism comprises a guide post vertically installed below the lifting plate (212) and a linear bearing installed on the driving end base (211), the lower end of the guide post slidably penetrates through the linear bearing, and the distance from the linear bearing to the ground is greater than the length of the guide post; the lifting driving mechanism comprises a worm and gear reducer arranged on the driving end base (211), the output end of the worm and gear reducer is vertically arranged upwards and is connected with a lifting screw rod, the upper end of the lifting screw rod penetrates through the lifting plate (211), a lifting screw rod nut which is arranged in a matched mode is arranged on the lifting screw rod, and the lifting screw rod nut is fixedly arranged on the lifting plate (211); the input end of the worm gear reducer is connected with a lifting driving motor;

the vertical guide mechanism further comprises a vertical hollow pneumatic chuck arranged on the drive end base (211), the vertical hollow pneumatic chuck is coaxially arranged above the linear bearing, and the guide column penetrates through the vertical hollow pneumatic chuck.

2. The NVH offline inspection table of the rear axle speed reducer according to claim 1, wherein the linear moving mechanism (313) comprises two linear moving guide rails which are parallel to and opposite to the upper surface of the loading end base (311), and a linear moving slide block which is slidably fitted on the linear moving guide rails, and the loading base plate (312) is fixedly installed on the linear moving slide block.

3. The NVH offline detection platform of the rear axle speed reducer according to claim 1, wherein a linear driving mechanism is further arranged between the loading base plate (312) and the loading end base (311), the linear driving mechanism comprises a linear moving screw rod arranged along the moving direction of the loading base plate (312) and a linear moving screw rod nut matched on the linear moving screw rod, two ends of the linear moving screw rod are rotatably mounted on the loading end base (311) through bearing supports, and one end of the linear moving screw rod is coaxially connected with a linear moving driving motor; the loading bottom plate (312) is fixedly connected with the linear moving screw rod nut.

4. The NVH offline inspection station of a rear axle retarder of claim 1, wherein the vertical guide mechanisms are arranged in two rows of three in the width direction of the lifting plate (212); the lifting driving mechanisms are arranged in two in the length direction of the lifting plate (212).

5. The NVH offline inspection station of the rear axle reducer according to claim 1, wherein the first linear sliding mechanism (216) comprises a first linear guiding mechanism and a first sliding driving mechanism, the first linear guiding mechanism comprises three first linear sliding guide rails arranged on the upper surface of the lifting plate (212) side by side along the length direction of the lifting plate (212), and a first linear sliding block slidably fitted on the first linear sliding guide rails, and the horizontal sliding plate (213) is fixedly installed on the first linear sliding block; the first sliding driving mechanism comprises a first linear sliding screw rod arranged in parallel with the first linear sliding guide rail and a first linear sliding screw rod nut matched with the first linear sliding screw rod, two ends of the first linear sliding guide rail are rotatably arranged on the lifting plate (212) through bearing supports, and one end of the first linear sliding guide rail is coaxially connected with a first sliding driving motor; the horizontal sliding plate (213) is fixedly connected with the first linear sliding screw rod nut.

6. The NVH offline inspection table of the rear axle reducer according to claim 5, wherein the second linear sliding mechanism (217) comprises a second linear guide mechanism and a second sliding drive mechanism, the second linear guide mechanism comprises two second linear sliding guide rails arranged side by side on the upper surface of the horizontal sliding plate (213) along the width direction of the lifting plate (212), and a second linear sliding block slidably fitted on the second linear sliding guide rails, and the drive base plate (214) is fixedly mounted on the second linear sliding block; the second sliding driving mechanism comprises a second linear sliding screw rod arranged in parallel with the second linear sliding guide rail and a second linear sliding screw rod nut matched with the second linear sliding screw rod, two ends of the second linear sliding guide rail are rotatably arranged on the horizontal sliding plate (213) through bearing supports, and two ends of the second linear sliding guide rail are coaxially connected with a second sliding driving motor; the driving bottom plate (214) is fixedly connected with the second linear sliding lead screw nut.

7. The NVH offline detection table of the rear axle speed reducer according to claim 1, wherein the driving assembly (22) comprises a driving motor (221), a rotating speed and torque sensor (222) and a driving bearing seat (223) which are sequentially connected, a rotatable driving connecting shaft is arranged in the middle of the driving bearing seat (223), the shaft end of the driving motor (221) is coaxially connected with one end of the rotating speed and torque sensor (222) through a shaft coupler, and the other end of the rotating speed and torque sensor (222) is coaxially connected with the driving connecting shaft through a shaft coupler.