Commercial vehicle drive axle transmission error testing system based on drive axle test bench

Abstract

The present application relates to a kind of commercial vehicle drive axle transmission error test systems based on drive axle test bench, including tool base, drive motor, sample bridge, input end tool, wheel edge tool, middle drive axle front end cover, extension shaft tool and angle encoder;Sample bridge is equipped with the middle drive axle sample bridge of interaxle differential lock device and axle differential lock device, input end tool is installed in the input end of sample bridge, wheel edge tool is installed in the hub output end of sample bridge, middle drive axle front end cover is cooperated with middle drive axle pinion shaft test tool design corresponding secondary processing, and is replaced in sample bridge, extension shaft tool is installed on middle drive axle front cover.This system can be in the scene using integrated angle encoder, overcome the influence of tool shaft shape and encoder inner diameter, realize the adjustment of tool installation height, make output shaft tool not bear torque and increase the torque operating range of input shaft, and respectively test to middle drive axle assembly single pair of gear transmission error.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of analysis and measurement control technology, and particularly relates to a commercial vehicle drive axle transmission error test system based on a drive axle test bench, which is used for testing the transmission error of gear pairs in a drive axle assembly. BACKGROUND

[0002] At present, the drive axle transmission error test generally adopts a grating type rotary angle encoder, which can be classified into an integrated rotary angle encoder and a split rotary angle encoder according to the diameter size and installation form. The inner diameter of the split rotary angle encoder is generally more than 180 mm, the grating and the reading head are independent of each other, are easy to arrange, but are expensive, have high maintenance and maintenance costs, and are difficult to popularize. In actual tests, the integrated angle encoder is more used, which has the characteristics that the inner diameter is generally not more than 50 mm, the grating and the reading head are designed as an inner and outer ring as a whole, and the price is relatively cheap and the popularization degree is high.

[0003] The structural characteristics of the integrated rotary angle encoder determine that there are many restrictions in use. Due to the limitation of the inner diameter, it can only be connected to the transmission system to be tested by connecting a tool shaft, which puts higher requirements on the whole test system. First, the tool shaft itself needs to be well supported and fixed to avoid bearing too large bending moment; second, the diameter of the tool shaft is limited by the inner diameter of the encoder, and the torque bearing capacity is limited. Since the torque transmitted by the commercial vehicle drive axle is generally large, the input torque is enlarged by the bevel gear of the main reducer, and the torque at the wheel edge of the drive axle is several times that of the input end, which limits the working condition range that can be tested by the transmission error test; finally, for the drive axle assembly containing multiple gear pairs, such as the cylindrical gear pair and the bevel gear pair in the center drive axle, since the tool shaft cannot be connected in the axle assembly, the transmission error of a single gear pair cannot be tested. Therefore, it is urgent to develop a commercial vehicle drive axle transmission error test system based on a drive axle test bench to effectively solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a commercial vehicle drive axle transmission error test system based on a drive axle test bench, which can realize adjustable tool support and overcome the wheel edge tool bearing capacity and the transmission error measurement of a single gear pair in the center drive axle assembly.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A kind of commercial vehicle drive axle transmission error test system based on drive axle test bench, including tool base 1, drive motor, sample bridge 5, input end tool 8, wheel edge tool 12, middle drive axle front end cover 14, extension shaft tool 16 and 3 angle encoders 20;

[0007] Wherein, the drive motor includes input motor 2 connected with drive axle input end and load motor I 3 and load motor II 4 located at left and right sides of drive axle wheel edge;

[0008] The sample bridge 5 is equipped with inter-axle differential lock device 6 and axle differential lock device 7, and the input end tool 8 is composed of encoder mounting shaft 9, transmission shaft side flange 10 and drive axle side flange 11, and is installed on the input end of sample bridge 5 and supported by tool base 1;The wheel edge tool 12 is composed of encoder mounting shaft 9 and wheel edge connecting flange 13, and is installed on the hub output end of sample bridge 5 and supported by tool base 1;

[0009] The middle drive axle front end cover 14 is matched with the middle drive axle pinion shaft 15 to test the tool design and corresponding secondary processing, and is replaced on the sample bridge 5;The extension shaft tool 16 is composed of extension dummy shaft 17, diameter expansion dummy shaft 18 and encoder support 19, and is installed on the middle drive axle front cover 14;The three angle encoders 20 are respectively installed on the encoder mounting shaft 9 in the input end tool 8 and the wheel edge tool 12 and the diameter expansion dummy shaft 18 in the extension shaft tool 16.

[0010] Further, the tool base 1 is a casting structure as a whole, the bottom can be connected with ground iron through foundation bolt, and the top is connected with tool mounting plate through bolt.

[0011] Further, the tool mounting plate is connected with the tool base 1 through long round hole, and the tool mounting plate is provided with encoder support and bearing seat, which are respectively connected with the outer ring of angle encoder 20 and encoder mounting shaft 9.

[0012] Further, the load motor II 4 is connected to the test system, and the motor on the same side of differential lock, i.e. load motor I 3, is not connected with wheel edge and wheel edge tool, and during the test, the load motor II 4 can load all torque by setting differential torque, the input motor 2 is used to control torque, and the load motor II 4 is used to control speed.

[0013] Further, the sample bridge 5 is a middle drive axle with through shaft, and the inter-axle differential lock device 6 and axle differential lock device 7 of sample bridge 5 are locked at the same time during the test.

[0014] Further, the input end tool 8 is connected in series between the test bench input end transmission shaft and drive axle input flange through the transition flange including transmission shaft side flange 10 and drive axle side flange 11.

[0015] Further, the wheel-side tool 12 is located on the wheel-side with inter-axle differential lock on the test sample axle 5, and is connected with the drive axle half shaft flange through the wheel-side connecting flange 13, and the wheel-side connecting flange 13 is positioned by using a straight mouth with the same outer diameter size as the half shaft flange.

[0016] Further, the front end cover 14 of the middle drive axle is drilled with a false shaft hole at the position of the pinion shaft end, for accommodating the extended false shaft 17, and a threaded hole is machined for installing the encoder support 19; the pinion shaft 15 of the middle drive axle is machined with an inner spline hole at the end face of the side close to the front end cover 14 of the middle drive axle, and is connected with the extended false shaft 17.

[0017] Further, the encoder support 19 is bolted at one end to the front end cover 14 of the middle drive axle, and the other end is opened with an arc long circular hole to fix the outer ring of the angle encoder 20, and the encoder support 19 is machined with an inner hole to accommodate the extended false shaft 17, and the contact surfaces between the inner hole and the extended false shaft 17 and the front end cover 14 of the middle drive axle are sealed.

[0018] Further, the extended false shaft 17 is supported by a needle bearing in the inner hole of the encoder support 19, and one end is machined with an outer spline to be connected with the pinion shaft 15 of the middle drive axle.

[0019] Further, the diameter-expanded false shaft 18 is connected with the extended false shaft 17, for installing and fixing the inner ring of the angle encoder 20.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The drive axle transmission error test system of the present application can overcome the influence of the tool shaft shape and the inner diameter of the encoder in the scenario of using a low-cost integrated angle encoder, realize the adjustment of the installation height of the tool, make the output shaft tool not bear the torque, and increase the torque working condition range of the input shaft, and respectively test the single-pair gear transmission error of the middle drive axle assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 It is the overall layout of the test system;

[0024] Figure 2 It is the assembly and installation diagram of the input end tool.

[0025] Figure 3 Assembly and installation diagram of the input end tooling;

[0026] Figure 4 Assembly and installation diagram of the extension shaft tooling.

[0027] In the figure, 1. tooling base 2. input motor 3. load motor I 4. load motor II 5. test sample axle 6. inter-wheel differential lock device 7. inter-axle differential lock device 8. input end tooling 9. encoder mounting shaft 10. drive axle side flange 11. drive axle side flange 12. wheel end tooling 13. wheel end connecting flange 14. front end cover of the middle drive axle 15. pinion shaft of the middle drive axle 16. extension shaft tooling 17. extension axle 18. diameter expansion axle 19. encoder support 20. angle encoder. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the embodiments:

[0029] The application will be further described below in conjunction with the embodiments and the drawings. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.

[0030] It should be noted that: similar labels and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] As Figure 1 shown, the application is based on a commercial vehicle drive axle transmission error test system of a drive axle test bench, which includes a tooling base 1, a drive motor matched with the drive axle test bench, a test sample axle 5, an input end tooling 8, a wheel end tooling 12, a front end cover of the middle drive axle 14, an extension shaft tooling 16 and an angle encoder 20.

[0032] The tooling base 1 is a whole casting structure, the bottom can be connected with the ground iron through the foundation bolt, and the top is connected with the tooling mounting plate through the bolt. The bolt hole opened on the tooling base 1 is a long round hole, the adjustment of the bolt tightening position can realize the adjustment of the tooling installation height. The encoder support and the bearing seat are fixed on the tooling mounting plate through the bolt connection, respectively connecting the outer ring of the angle encoder 20 and the encoder mounting shaft 9, and connecting with the tooling.

[0033] The driving motor is composed of an input motor 2, a load motor I 3 and a load motor II 4. The input motor 2 is connected with the input end of the driving axle, and the load motor I 3 and the load motor II 4 are respectively located at the left and right wheel edges of the driving axle, matched with the test bench, only the dynamometer on the opposite side of the differential lock, i.e. the load motor II 4 is connected to the test system, and the motor on the same side of the differential lock, i.e. the load motor I 3 is not connected with the wheel edge and the wheel edge tooling and does not play a role in the test process. In the test process, the torque of the two load motors is adjusted through the control algorithm of the test bench, so as to realize the load of the load motor II 4 to all the output torque. For the application of load, the input motor 2 controls the torque quantitatively, and the output motor II 4 controls the speed quantitatively, and the remaining parameters can be calculated by the control algorithm of the test bench.

[0034] The test sample axle 5 is a middle driving axle sample with an inter-wheel differential lock device 6 and an inter-axle differential lock device 7, and in the test process, the inter-wheel differential lock device 6 and the inter-axle differential lock device 7 are locked by using a threaded jacking rod or a gas pressure control valve.

[0035] As shown in Figure 2 The input end tooling 8 is composed of an encoder mounting shaft 9, a transmission shaft side flange 10 and a driving axle side flange 11, and is installed at the input end of the test sample axle 5 and is supported by the tooling base 1. The input end tooling 8 is connected with the input end transmission shaft of the test bench and the driving axle input flange through the transmission shaft side flange 10 and the driving axle side flange 11.

[0036] As shown in Figure 3 The wheel edge tooling 12 is composed of an encoder mounting shaft 9 and a wheel edge connecting flange 13, and is installed at the hub output end of the test sample axle 5 and is supported by the tooling base 1. The wheel edge tooling 12 is provided on the side of the test sample axle 5 with the inter-wheel differential lock, and is connected with the driving axle half shaft flange through the wheel edge connecting flange 13, and the wheel edge connecting flange 13 is positioned by using a straight mouth with the same outer diameter size as the half shaft flange.

[0037] As shown in Figure 4 The middle driving axle front end cover 14 is drilled with a false shaft hole at the position of the pinion shaft end to accommodate the extended false shaft 17, and a threaded hole is machined to install the encoder support 19. The middle driving axle pinion shaft 15 is machined with an inner spline hole at the end face near the side of the middle driving axle front end cover 14, and is connected with the extended false shaft 17.

[0038] The extension shaft tooling 16 is composed of an extension dummy shaft 17, a diameter expansion dummy shaft 18 and an encoder support 19, which is installed on the front cover 14 of the middle drive axle. Specifically, one end of the encoder support 19 is bolted to the front cover 14 of the middle drive axle, and the other end is provided with an arc-shaped long circular hole to fix the outer ring of the angle encoder 20. The encoder support 19 is provided with an inner hole to accommodate the extension dummy shaft 17, and the inner hole and the contact surface between the extension dummy shaft 17 and the front cover 14 of the middle drive axle are sealed. The extension dummy shaft 17 is supported by a needle bearing in the inner hole of the encoder support 19, and one end is provided with an external spline to connect with the pinion shaft 15 of the middle drive axle. The diameter expansion dummy shaft 18 is connected with the extension dummy shaft 17 to mount and fix the inner ring of the angle encoder 20.

[0039] The angle encoders 20 are three in number, which are respectively installed on the encoder mounting shaft 9 in the input end tooling 8 and the wheel edge tooling 12, and on the diameter expansion dummy shaft 18 in the extension shaft tooling 16.

[0040] Embodiment 1

[0041] A commercial vehicle drive axle transmission error test system based on a drive axle test bench, which comprises a tooling base 1, a drive motor matched with the test bench, a sample bridge 5, an input end tooling 8, a wheel edge tooling 12, a front cover 14 of the middle drive axle, an extension shaft tooling 16 and an angle encoder 20.

[0042] The tooling base 1 is of cast iron structure, and is provided with a foot bolt groove at the bottom to be fixed to the ground iron T-shaped groove by a foot bolt; the top is a tooling mounting plate connected by bolts, and the tooling mounting plate is provided with a long circular hole, and the height can be adjusted by changing the tightening position of the bolts. The encoder support and the bearing seat are bolted to the tooling mounting plate to connect the outer ring of the angle encoder 20 and the encoder mounting shaft 9, respectively.

[0043] The drive motor is composed of an input motor 2, a load motor I 3 and a load motor II 4. The input motor 2 is connected with the input end of the drive axle, and the load motor I 3 and the load motor II 4 are respectively located at the left and right wheel edges of the drive axle and matched with the test bench. Only the dynamometer on the opposite side of the differential lock, i.e. the load motor II 4, is connected to the test system, and the motor on the same side of the differential lock, i.e. the load motor I 3, is not connected with the wheel edge and the wheel edge tooling. During the test, the load motor II 4 is set to load all the torque. During the test, the torque is controlled by the input motor 2, and the speed is controlled by the load motor I 3 and the load motor II 4.

[0044] The sample bridge 5 is a middle drive axle with a through shaft, and the inter-wheel differential lock device 6 and the inter-axle differential lock device 7 should be locked at the same time during the test.

[0045] The input end tooling 8 is connected in series between the input end transmission shaft and the input flange of the drive axle through the transition flan, which is connected by the face gear, and the drive axle side flange 11.

[0046] The wheel end tooling 12 is located on the wheel side of the test axle 5 with the inter-wheel differential lock, and is connected with the drive axle half shaft flange through the wheel end connecting flange 13. The wheel end connecting flange 13 is installed and centered through the straight mouth with the same outer diameter as the half shaft flange.

[0047] The middle drive axle front end cover 14 is drilled with a false shaft hole at the corresponding position of the middle drive axle pinion shaft 15 for accommodating the extended false shaft 17, and a threaded hole is machined for installing the encoder support 19.

[0048] The middle drive axle pinion shaft 15 is machined with an inner spline hole at the shaft end near the middle drive axle front end cover 14 for connecting with the extended false shaft 17. The spline connection between the middle drive axle pinion shaft 15 and the extended false shaft 17 is fixed by a lock nut.

[0049] The extended shaft tooling 16 is composed of the extended false shaft 17, the diameter expansion false shaft 18 and the encoder support 19.

[0050] The encoder support 19 is bolted at one end to the middle drive axle front end cover 14, and the other end is opened with an arc long circular hole to fix the outer ring of the angle encoder 20. An inner hole is machined to accommodate the extended false shaft 17, and a rubber sealing ring is used between the inner hole and the false shaft for sealing, and sealing glue is used between the contact surface of the encoder support and the middle drive axle front end cover.

[0051] The extended false shaft 17 is supported by a needle bearing in the inner hole of the encoder support 19, and is machined with an outer spline at the inward end for connecting with the middle drive axle pinion shaft 15; and is machined with a thread at the outward end for connecting with the diameter expansion false shaft 18 through a gasket and a lock nut.

[0052] The diameter expansion false shaft 18 is used for installing and fixing the inner ring of the angle encoder 20, and is connected with the extended false shaft 17 through a gasket and a lock nut.

[0053] According to the drawings, the present application is based on the commercial vehicle drive axle transmission error test system of the drive axle test bench, and the specific use process is as follows: first, install and arrange the input end tooling, the wheel end tooling and the tooling base, and correctly connect the tooling with the dynamometer motor. Start the test bench, control the torque and speed of the input test axle through the dynamometer motor. At the same time, record the angle information collected by the angle encoders in the three toolings for subsequent processing to obtain the transmission error data of a pair of gears.

[0054] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A test system for transmission error of a commercial vehicle drive axle based on a drive axle test bench, characterized in that: It includes a tooling base (1), a drive motor, a sample bridge (5), an input end tooling (8), a wheel edge tooling (12), a front cover of the middle drive axle (14), an extension shaft tooling (16), and three angle encoders (20); The drive motor includes an input motor (2) connected to the input end of the drive axle, and a load motor I (3) and a load motor II (4) located on the left and right sides of the drive axle. The test bridge (5) is a drive bridge test bridge equipped with an inter-wheel differential lock device (6) and an inter-axle differential lock device (7); the input end fixture (8) consists of an encoder mounting shaft (9), a transmission shaft side flange (10) and a drive axle side flange (11), and is installed at the input end of the test bridge (5) and supported by the fixture base (1); the wheel-side fixture (12) consists of an encoder mounting shaft (9) and a wheel-side connecting flange (13), and is installed at the wheel hub output end of the test bridge (5) and supported by the fixture base (1); The front cover (14) of the middle drive axle and the pinion shaft (15) of the middle drive axle are designed for secondary processing and then installed on the test bridge (5); the extension shaft fixture (16) consists of an extension dummy shaft (17), a diameter extension dummy shaft (18) and an encoder support (19), and is installed on the front cover (14) of the middle drive axle; the three angle encoders (20) are respectively installed on the encoder mounting shaft (9) in the input end fixture (8) and the wheel edge fixture (12) and on the diameter extension dummy shaft (18) in the extension shaft fixture (16); The front cover of the middle drive axle has a dummy shaft hole drilled at the end of the pinion shaft to accommodate the extended dummy shaft, and a threaded hole is machined to install the encoder support; the pinion shaft of the middle drive axle has an internal spline hole machined on the shaft end face near the front cover of the middle drive axle to connect with the extended dummy shaft.

2. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The tooling base (1) is a cast structure. The bottom can be connected to the ground iron by anchor bolts, and the top can be connected to the tooling mounting plate by bolts. The tooling mounting plate and the tooling base (1) are connected by an elongated hole. The tooling mounting plate is equipped with an encoder bracket and a bearing seat, which are respectively connected to the outer ring of the angle encoder (20) and the encoder mounting shaft (9).

3. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The load motor II (4) is connected to the test system. The motor on the same side as the differential lock, namely the load motor I (3), is not connected to the wheel side and the wheel side tooling. It does not play a role in the test. During the test, by setting the differential torque, the load motor II (4) can carry the full torque. The input motor (2) is used to control the torque, and the load motor II (4) is used to control the speed.

4. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The test bridge (5) is a drive bridge with a through shaft. During the test, the inter-wheel differential lock device (6) and the inter-axle differential lock device (7) are locked using a threaded push rod or a pneumatic control valve.

5. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The input end fixture (8) is connected in series between the transmission shaft and the drive axle input flange of the test bench via the transmission shaft side flange (10) and the drive axle side flange (11).

6. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The wheel-side fixture (12) is located on the wheel side of the test bridge (5) with the inter-wheel differential lock. It is connected to the drive axle half-shaft flange through the wheel-side connecting flange (13). The wheel-side connecting flange (13) is positioned using a straight opening with the same outer diameter as the half-shaft flange.

7. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The front cover (14) of the middle drive axle has a dummy shaft hole drilled at the end of the pinion shaft to accommodate the extended dummy shaft (17), and a threaded hole is machined to install the encoder support (19); the pinion shaft (15) of the middle drive axle has an internal spline hole machined on the shaft end face near the front cover (14) of the middle drive axle to connect with the extended dummy shaft (17).

8. The commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: One end of the encoder support (19) is bolted to the front cover (14) of the middle drive axle, and the other end has an arc-shaped elongated hole to fix the outer ring of the angle encoder (20). The encoder support (19) has an inner hole to accommodate the extended dummy shaft (17), and a seal is formed between the inner hole and the extended dummy shaft (17) and between the contact surface with the front cover (14) of the middle drive axle.

9. A commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The extended dummy shaft (17) is supported in the inner hole of the encoder support (19) by a needle roller bearing, and has an external spline at one end, which is connected to the small gear shaft (15) of the middle drive axle.

10. A commercial vehicle drive axle transmission error testing system based on a drive axle test bench according to claim 1, characterized in that: The diameter extension dummy shaft (18) is connected to the extension dummy shaft (17) for mounting and fixing the inner ring of the angle encoder (20).

Images