Transmission efficiency test bench for ball screw of electronic power-assisted steering machine

Abstract

The utility model relates to the technical field of steering system testing, in particular to an electronic power steering machine ball screw transmission efficiency test bench which comprises a bottom plate, a ball screw support, a cover plate, a tensioning sleeve, a sensor support, a torque sensor, a large belt wheel, a double-linear-bearing mechanism, a moving mechanism, a driving motor, a small belt wheel and a synchronous belt. A first bearing of the ball screw is installed in an installation hole of a ball screw support, a sensor support is provided with a torque sensor and a large belt wheel, a transmission belt wheel of the ball screw and the torque sensor are connected through a tensioning sleeve, the end of a screw body of the ball screw is connected with a double-linear-bearing mechanism, and a shaft of a driving motor is connected with a mandrel of a small belt wheel. And the synchronous belt is sleeved outside the large belt wheel and the small belt wheel. Compared with the prior art, the transmission efficiency of the ball screw is directly evaluated, the steering engine assembly rack resource is saved, the test response speed is improved, and a foundation is laid for improving the efficiency of subsequent ball screw problem analysis.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steering system test technical field, concretely electronic power steering gear ball screw drive efficiency test bench. BACKGROUND

[0002] Parallel axis type electronic power steering gear is the mainstream product in the current steering gear field.

[0003] At present, only the output efficiency can be tested and evaluated at the steering gear level, and the ball screw pair drive efficiency cannot be evaluated.

[0004] Therefore, it is necessary to design an electronic power steering gear ball screw drive efficiency test bench to meet the evaluation requirement of the ball screw pair drive efficiency. SUMMARY

[0005] The utility model discloses a kind of electronic power steering gear ball screw drive efficiency test benches to overcome the deficiency of prior art, to meet the evaluation requirement of the ball screw pair drive efficiency.

[0006] In order to achieve the above-mentioned purpose, the utility model is a kind of electronic power steering gear ball screw drive efficiency test bench, including bottom plate, ball screw support, cover plate, tension sleeve, sensor support, torque sensor, large pulley, double linear bearing mechanism, moving mechanism, drive motor, small pulley, synchronous belt, the top side of bottom plate is fixed with ball screw support, double linear bearing mechanism, sensor support can be slidably installed on bottom plate, and sensor support is located between ball screw support and double linear bearing mechanism, the bearing one of ball screw is installed in the mounting hole of ball screw support, cover plate is fixed at the front side of ball screw support, and the inner surface of cover plate abuts the bearing one end surface of ball screw, torque sensor is installed at the front side of sensor support, large pulley is installed at the rear side of sensor support, tension sleeve is connected between the drive pulley of ball screw and torque sensor, the end of the screw body of ball screw passes through tension sleeve, torque sensor, large pulley, and is connected with the front end of double linear bearing mechanism after, moving mechanism is installed on the other side of the top of bottom plate, drive motor is installed on moving mechanism, the shaft of drive motor is connected with the mandrel of small pulley, and synchronous belt is sleeved in large pulley, small pulley outside.

[0007] The ball screw includes screw body, nut, rotary steel ball, bearing one, washer, drive pulley, nut is sleeved outside screw body, rotary steel ball is arranged between nut and screw body, the inner ring of bearing one is connected with the outer ring middle part of nut, the outer ring of bearing one is fixed with the mounting hole of ball screw support, washer is arranged between bearing one and ball screw support, drive pulley is sleeved behind the outer ring of nut.

[0008] The other end of the screw rod body is connected with a hydraulic cylinder, and a pressure sensor is arranged between the screw rod body and the hydraulic cylinder.

[0009] The torque sensor is a Lenz hollow torque sensor.

[0010] The inner ring front end of the tensioner sleeve is mounted on the outer ring of the drive pulley, the outer ring of the tensioner sleeve is fastened by bolts, and the rear end of the tensioner sleeve is connected with the measuring end of the torque sensor.

[0011] The double linear bearing mechanism comprises a fixed support, a connecting support plate, guide rods, linear bearing seats and end face support plates, the bottom of the fixed support is fixed with a bottom plate, two linear bearing seats are mounted on the upper part of the fixed support, the front ends of the two guide rods pass through the corresponding linear bearing seats, the front ends of the two guide rods are connected by the connecting support plate, the middle part of the connecting support plate is fixed with the end part of the screw rod body by bolts, and the rear ends of the two guide rods are connected by the end face support plates.

[0012] The bottom plate is provided with transversely arranged guide rail grooves, and the sensor support is slidably connected with the guide rail grooves.

[0013] The moving mechanism comprises linear guide rails one, a transverse sliding plate, linear guide rails two, a longitudinal sliding plate, a driving motor support and a bearing support, the linear guide rails one are transversely arranged on the top of the bottom plate, the transverse sliding plate is slidably connected with the linear guide rails one, the linear guide rails two are longitudinally arranged on the top of the transverse sliding plate, the longitudinal sliding plate is slidably connected with the linear guide rails two, and the top of the longitudinal sliding plate is provided with the driving motor support and the bearing support.

[0014] A handle support is mounted on the transverse sliding plate, a handle is mounted on the upper part of the handle support, and the shaft of the handle is connected with the longitudinal sliding plate.

[0015] A driving motor is mounted on the upper part of the driving motor support, a bearing support seat is mounted on the upper part of the bearing support, two bearings two are mounted in the bearing support seat, the core shaft outer ring of the small pulley is connected with the bearings two, and the core shaft end of the small pulley is connected with the shaft of the driving motor by a shaft coupling.

[0016] Compared with the prior art, the electronic power steering machine ball screw transmission efficiency test bench is designed, the transmission efficiency of the ball screw is directly evaluated, the steering machine assembly bench resources are saved, the test response speed is improved, and the efficiency of subsequent ball screw problem analysis is laid as a foundation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model.

[0018] Figure 2A partial sectional view of the ball screw of the utility model.

[0019] Figure 3 An enlarged sectional view of the ball screw of the utility model.

[0020] Figure 4 A schematic view of the inner ring of the transmission pulley and the tensioner sleeve of the utility model.

[0021] Figure 5 A sectional view of the driving motor, the small pulley and the shaft coupling of the utility model.

[0022] Figure 6 A sectional view of the double linear bearing mechanism of the utility model.

[0023] Figure 7 A schematic view of the double linear bearing mechanism of the utility model. DETAILED DESCRIPTION

[0024] The utility model will be further described in combination with the drawings.

[0025] Referring to Figure 1 , the utility model relates to an electronic power steering machine ball screw transmission efficiency test bench, including bottom plate, ball screw support, cover plate, tensioner sleeve, sensor support, torque sensor, large pulley, double linear bearing mechanism, moving mechanism, driving motor, small pulley, synchronous belt, the top side of bottom plate 1 is fixed with ball screw support 2, double linear bearing mechanism 9, sensor support 7 can be slidably installed on bottom plate 1, and sensor support 7 is located between ball screw support 2 and double linear bearing mechanism 9, the bearing one 34 of ball screw 3 is installed in the mounting hole of ball screw support 2, cover plate 4 is fixed at the front side of ball screw support 2, and the inner surface of cover plate 4 is against the bearing one 34 end surface of ball screw 3, the front side of sensor support 7 is provided with torque sensor 6, the rear side of sensor support 7 is provided with large pulley 8, the transmission pulley 36 of ball screw 3 is connected between torque sensor 6 using tensioner sleeve 5, the end of screw body 31 of ball screw 3 passes through tensioner sleeve 5, torque sensor 6, large pulley 8 and is connected with the front end of double linear bearing mechanism 9, the top other side of bottom plate 1 is installed with moving mechanism, and driving motor 15 is installed on moving mechanism, the shaft of driving motor 15 is connected with the mandrel of small pulley 10, and synchronous belt 12 is sleeved on large pulley 8 and small pulley 10.

[0026] Referring to Figure 2 , Figure 3, the ball screw 3 includes a screw rod body 31, a nut 32, a rotating steel ball 33, a bearing one 34, a washer 35, a transmission pulley 36, the nut 32 is sleeved on the screw rod body 31, the rotating steel ball 33 is arranged between the nut 32 and the screw rod body 31, the inner ring of the bearing one 34 is connected with the middle part of the outer ring of the nut 32, the outer ring of the bearing one 34 is fixed with the mounting hole of the ball screw support 2, the washer 35 is arranged between the bearing one 34 and the ball screw support 2, and the transmission pulley 36 is sleeved on the rear part of the outer ring of the nut 32.

[0027] The internal structure of the ball screw support 2 refers to the size of the steering machine shell, and the damping washers 35 on both sides of the bearing one 34 are radially supported; the cover plate 4 simulates the size and structural features of the steering machine gear box cover. The cover plate 4 and the ball screw support 2 are fixed by bolts, and the bearing one 34 is axially pre-tightened.

[0028] The torque sensor 6 is a Lenz hollow torque sensor.

[0029] Referring to Figure 4 The tensioner sleeve 5 is a hydraulic tensioner sleeve, the inner ring of the tensioner sleeve 5 is mounted on the outer ring of the transmission pulley 36, the outer ring of the tensioner sleeve 5 is fastened by bolts, the tensioner sleeve 5 is locked on the outer contour of the transmission pulley 36 in an envelope manner, and torque is transmitted. The rear end of the tensioner sleeve 5 is connected with the measuring end of the torque sensor 6, so that pre-assembly is realized, and subsequent disassembly is not required.

[0030] Referring to Figure 6 , Figure 7 The double linear bearing mechanism 9 plays a role in preventing the screw rod body 31 from tilting and rotating, and the double linear bearing mechanism 9 includes a fixed support 91, a connecting support plate 92, a guide rod 93, a linear bearing seat 94, and an end face support plate 95. The bottom of the fixed support 91 is fixed with the bottom plate 1, the upper part of the fixed support 91 is provided with two linear bearing seats 94, two guide rods 93 pass through the corresponding linear bearing seats 94, the front ends of the two guide rods 93 are connected by the connecting support plate 92, the middle part of the connecting support plate 92 is fixed with the end of the screw rod body 31 by bolts, and the rear ends of the two guide rods 93 are connected by the end face support plate 95.

[0031] The bottom plate 1 is provided with a transversely arranged guide rail groove, and the sensor support 7 is slidably connected with the guide rail groove. The torque sensor 6, the tensioner sleeve 5 and the large pulley 8 are pre-assembled in a series structure subunit, and during the test, they do not need to be assembled again. Only the sensor support 7 needs to be manually pushed to slide along the guide rail groove of the bottom plate, so that the position of the sensor support 7 is adjusted, and the pre-tightening of the tensioner sleeve 5 and the transmission pulley 36 is completed.

[0032] The moving mechanism comprises a linear guide rail I 23, a transverse sliding plate 22, a linear guide rail II 18, a longitudinal sliding plate 17, a driving motor support 16, a bearing support 21, the linear guide rail I 23 is horizontally arranged on the top of the bottom plate 1, the transverse sliding plate 22 is slidably connected with the linear guide rail I 23, the linear guide rail II 18 is vertically arranged on the top of the transverse sliding plate 22, the longitudinal sliding plate 17 is slidably connected with the linear guide rail II 18, and the top of the longitudinal sliding plate 17 is provided with the driving motor support 16 and the bearing support 21.

[0033] A handle support 20 is arranged on the transverse sliding plate 22, and a handle 19 is arranged on the upper portion of the handle support 20, and the shaft of the handle 19 is connected with the longitudinal sliding plate 17.

[0034] Referring to Figure 5 The upper portion of the driving motor support 16 is provided with a driving motor 15, the upper portion of the bearing support 21 is provided with a bearing support seat 11, two bearing IIs are arranged in the bearing support seat 11, the outer ring of the shaft of the small pulley 10 is connected with the bearing II, and the shaft end of the small pulley 10 is connected with the shaft of the driving motor 15 through a shaft coupling 14.

[0035] Before operation, the transverse sliding plate 22 is horizontally moved on the linear guide rail I 23, so that the positions of the large pulley 8 and the small pulley 10 are matched. Then, the longitudinal sliding plate 17 is vertically moved on the linear guide rail II 18 through the handle 19, the center distance of the large pulley 8 and the small pulley 10 is adjusted, and the tension degree of the synchronous belt 12 is adjusted, preferably, the transmission ratio of the driving motor 15 and the large pulley 8 is 1:4, the speed is reduced and the torque is increased, and the transmission efficiency test of the ball screw 3 under high load working condition is met.

[0036] When the equipment is operated, the transmission pulley 36 rotates synchronously with the tensioning sleeve 5, the torque sensor 6 and the large pulley 8, rotation power is provided for the nut 32, and the torque is collected in real time through the torque sensor 6 in the process. The torque sensor 6 can directly collect the torque required when the nut 32 rotates, at the same time, other transmission systems are avoided, and the torque collection value is ensured to be a true value.

[0037] The double linear bearing mechanism 9 follows the reciprocating motion of the screw rod body 31. Since the friction pair of the linear bearing itself is very small, the friction pair of the linear bearing can be ignored compared with the sliding force of the ball screw, and the linear bearing has no influence on the output efficiency.

[0038] In the working process of the utility model, the other end of the screw rod body 31 is connected with a hydraulic cylinder, and a pressure sensor is arranged between the screw rod body 31 and the hydraulic cylinder. The pressure sensor measures the rated load provided by the hydraulic cylinder. According to the formula Frack=[Tmotor / P]×2π×η, wherein Frack is the rated load provided by the hydraulic cylinder, Tmotor is the torque value collected by the torque sensor 6, and P is the pitch of the screw rod body 31. The actual transmission efficiency η of the screw rod can be calculated.

[0039] The utility model discloses electronic power steering gear ball screw drive efficiency test bench, directly to the transmission efficiency of ball screw is evaluated, has saved steering gear assembly rack resources, improved test response speed, laid the foundation for the efficiency promotion of subsequent ball screw problem analysis. The utility model has the advantages of convenient installation, fast measurement.

Claims

1. An electronic power steering gear ball screw transmission efficiency test bench, comprising a bottom plate, a ball screw support, a cover plate, a tension sleeve, a sensor support, a torque sensor, a large pulley, a double linear bearing mechanism, a moving mechanism, a drive motor, a small pulley, a synchronous belt, characterized in that: The top side of the bottom plate (1) is fixed with a ball screw support (2) and a double linear bearing mechanism (9), a sensor support (7) is slidably mounted on the bottom plate (1), and the sensor support (7) is located between the ball screw support (2) and the double linear bearing mechanism (9), a bearing one (34) of the ball screw (3) is mounted in the mounting hole of the ball screw support (2), a cover plate (4) is fixed on the front side of the ball screw support (2), and the inner surface of the cover plate (4) abuts against the end face of the bearing one (34) of the ball screw (3), a torque sensor (6) is mounted on the front side of the sensor support (7), a large pulley (8) is mounted on the rear side of the sensor support (7), a tension sleeve (5) is connected between the transmission pulley (36) of the ball screw (3) and the torque sensor (6), the end of the screw body (31) of the ball screw (3) passes through the tension sleeve (5), the torque sensor (6) and the large pulley (8), and is connected with the front end of the double linear bearing mechanism (9), a moving mechanism is mounted on the other top side of the bottom plate (1), a driving motor (15) is mounted on the moving mechanism, the shaft of the driving motor (15) is connected with the core shaft of a small pulley (10), and a synchronous belt (12) is sleeved outside the large pulley (8) and the small pulley (10).

2. The test bench for testing the efficiency of the ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The ball screw (3) comprises a screw body (31), a nut (32), a rotary steel ball (33), a bearing one (34), a gasket (35) and a transmission pulley (36), the nut (32) is sleeved outside the screw body (31), the rotary steel ball (33) is arranged between the nut (32) and the screw body (31), the inner ring of the bearing one (34) is connected with the middle part of the outer ring of the nut (32), the outer ring of the bearing one (34) is fixed with the mounting hole of the ball screw support (2), the gasket (35) is arranged between the bearing one (34) and the ball screw support (2), and the transmission pulley (36) is sleeved at the rear part of the outer ring of the nut (32).

3. The test bench for testing the efficiency of the ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The other end of the screw body (31) is connected with a hydraulic cylinder, and a pressure sensor is arranged between the screw body (31) and the hydraulic cylinder.

4. The test bench for testing the efficiency of the ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The torque sensor (6) is a Lenz hollow torque sensor.

5. The test bench for testing the efficiency of the ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The inner ring of the tension sleeve (5) is mounted on the outer ring of the transmission pulley (36), the outer ring of the tension sleeve (5) is fastened by bolts, and the rear end of the tension sleeve (5) is connected with the measuring end of the torque sensor (6).

6. The test bench for testing the efficiency of a ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The double linear bearing mechanism (9) comprises a fixed support (91), a connecting support plate (92), a guide rod (93), a linear bearing seat (94) and an end face support plate (95), the bottom of the fixed support (91) is fixed with the bottom plate (1), two linear bearing seats (94) are mounted on the upper part of the fixed support (91), two guide rods (93) pass through the corresponding linear bearing seats (94), the front ends of the two guide rods (93) are connected by the connecting support plate (92), the middle part of the connecting support plate (92) is fixed with the end of the screw body (31) by bolts, and the rear ends of the two guide rods (93) are connected by the end face support plate (95).

7. The test bench for testing the efficiency of a ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The bottom plate (1) is provided with transversely arranged guide rail grooves, and the sensor support (7) is in sliding connection with the guide rail grooves.

8. The test bench for testing the efficiency of a ball screw transmission of an electric power steering machine according to claim 1, characterized in that: The moving mechanism comprises a linear guide rail one (23), a transverse sliding plate (22), a linear guide rail two (18), a longitudinal sliding plate (17), a driving motor support (16) and a bearing support (21). The linear guide rail one (23) is transversely arranged on the top of the bottom plate (1). The transverse sliding plate (22) is in sliding connection with the linear guide rail one (23). The linear guide rail two (18) is longitudinally arranged on the top of the transverse sliding plate (22). The longitudinal sliding plate (17) is in sliding connection with the linear guide rail two (18). The top of the longitudinal sliding plate (17) is provided with the driving motor support (16) and the bearing support (21).

9. The test bench for testing the efficiency of the ball screw transmission of an electric power steering machine according to claim 8, characterized in that: The transverse sliding plate (22) is provided with a handle support (20). A handle (19) is arranged on the upper portion of the handle support (20). The shaft of the handle (19) is connected with the longitudinal sliding plate (17).

10. The test bench for testing the efficiency of a ball screw transmission of an electric power steering machine according to claim 8, characterized in that: The upper portion of the driving motor support (16) is provided with a driving motor (15). The upper portion of the bearing support (21) is provided with a bearing support seat (11). Two bearings two are arranged in the bearing support seat (11). The shaft core outer ring of the small pulley (10) is connected with the bearings two. The shaft core end portion of the small pulley (10) is connected with the shaft of the driving motor (15) through a shaft coupling (14).

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