Engine dynamometer platform

Abstract

The application belongs to the technical field of engine detection equipment, and particularly discloses an engine dynamometer platform, which comprises a vertical stand, a to-be-detected engine fixed to the left side wall of the vertical stand, a linkage shaft sleeve with a linkage insertion hole in the left end face rotatably connected to the vertical stand, a synchronous shaft sleeve capable of synchronous rotation sleeved on the right end of the crankshaft of the to-be-detected engine, the synchronous shaft sleeve being inserted into the linkage insertion hole of the linkage shaft sleeve and capable of synchronous rotation in the circumferential direction and axial relative movement with the linkage shaft sleeve, and the right end of the linkage shaft sleeve being in transmission cooperation with the input end of a dynamometer. The whole structure of the engine dynamometer platform is ingenious and reasonable, and the cost is low. Through the loose joint structure of the axial relative sliding and the circumferential synchronous rotation between the linkage shaft sleeve and the synchronous shaft sleeve, the crankshaft of the engine can be free from the axial force, and the engine can be effectively prevented from being damaged.

Description

Technical fields:

[0001] This invention belongs to the technical field of engine testing equipment, specifically referring to an engine dynamometer platform. Background technology:

[0002] To verify the operating status and safety performance of a car engine, various performance tests need to be performed on the engines before they leave the factory. However, existing engine dynamometer platforms basically connect the engine crankshaft directly to the existing dynamometer. By starting the engine and performing normal work, power is transmitted to the dynamometer to measure the power output.

[0003] However, in actual testing, it was found that since the dynamometer is fixed on the platform, when the engine to be tested is fixed on the platform and rigidly connected with the dynamometer, the engine crankshaft will be subjected to the axial force transmitted by the dynamometer. As a result, during the testing process, the crankshaft and the crank connecting rod mounted on the crankshaft will be axially offset and collide and rub against the engine housing, causing engine wear. Summary of the Invention:

[0004] The purpose of this invention is to provide an engine dynamometer platform, which adopts a movable joint structure with axial relative sliding and circumferential synchronous rotation between the linkage sleeve and the synchronization sleeve, so that the engine crankshaft can be free from axial forces and effectively avoid engine damage.

[0005] This invention is implemented as follows:

[0006] The engine dynamometer platform includes a vertical frame, on which the engine to be tested is fixed. A linkage bushing with a linkage insertion hole on its left end face is rotatably connected to the vertical frame. A synchronous bushing that can rotate synchronously is fitted on the right end of the crankshaft of the engine to be tested. The synchronous bushing is inserted into the linkage insertion hole of the linkage bushing, and the synchronous bushing and the linkage bushing can rotate synchronously in the circumferential direction and move relative to each other in the axial direction. The right end of the linkage bushing is in transmission engagement with the input end of the dynamometer.

[0007] In the aforementioned engine dynamometer platform, the vertical frame has an assembly through hole into which a bearing seat is inserted. One end of the bearing seat extends out of the assembly through hole and forms an annular protrusion along its radial direction. The annular protrusion is fixed to the vertical frame by fastening screws. The center of the inner hole of the bearing seat extends radially inward to form a positioning protrusion. The linkage bushing is rotatably connected to the bearing seat through a bearing. Two bearings are provided and are located on the left and right sides of the positioning protrusion, respectively. A positioning groove is provided on the inner wall of the bearing seat on the side of the bearing away from the positioning protrusion. A positioning snap ring is provided in the positioning groove. An assembly space for axially fixing the bearing is formed between the positioning snap ring and the corresponding side wall of the positioning protrusion.

[0008] In the aforementioned engine dynamometer platform, the right end of the crankshaft includes a large ring and a small ring from left to right, with a positioning step formed between the large and small rings. The synchronizer sleeve is fitted onto the small ring, and the left end face of the synchronizer sleeve abuts against the positioning step. A positioning seat is provided on the right side of the synchronizer sleeve, abutting against the right end face of the synchronizer sleeve. The tail end of the mounting screw passes through the positioning seat and is screwed to fix the right end face of the crankshaft. A spline protrusion is provided on the outer wall of the small ring, and a spline through groove that mates with the spline protrusion is provided on the inner hole of the synchronizer sleeve.

[0009] In the aforementioned engine dynamometer platform, a second spline protrusion is provided on the outer wall surface of the synchronous bushing, and a second spline through groove that mates with the second spline protrusion is provided on the linkage insertion hole of the linkage bushing.

[0010] In the aforementioned engine dynamometer platform, the right end of the linkage bushing is connected to the input shaft of the gearbox assembly, and the output shaft of the gearbox assembly is connected to the input end of the dynamometer.

[0011] In the aforementioned engine dynamometer platform, the gearbox assembly includes a housing, and an input shaft and an output shaft rotatably connected side-by-side on the housing. The input shaft is equipped with a drive gear, and the output shaft is equipped with a driven gear that meshes with the drive gear.

[0012] In the aforementioned engine dynamometer platform, the input shaft and the output shaft have the same structure. The output shaft is equipped with a drive gear, and the driven gear is sleeved on the drive gear of the output shaft. The inner ring wall of the driven gear has an internal tooth groove that engages with the teeth of the drive gear. Fixed grooves are provided on the teeth of the drive gear located on both sides of the driven gear. Fixed retaining rings are fitted on the fixed grooves, and an assembly space for axially fixing the driven gear is formed between the two fixed retaining rings.

[0013] In the aforementioned engine dynamometer platform, the input shaft and output shaft are integrated with the corresponding drive gear.

[0014] In the aforementioned engine dynamometer platform, a linkage elastic element is provided between the right end of the linkage sleeve and the input shaft, and between the output shaft and the input end of the dynamometer. Several circumferentially distributed linkage slots are provided on the outer edge of the linkage elastic element. The right end of the linkage sleeve, the corresponding end of the input shaft, the corresponding end of the output shaft, and the input end of the dynamometer are all provided with a linkage disc body corresponding to the structure of the linkage elastic element. Several circumferentially distributed linkage claws that can be inserted into the linkage slots are provided on the end face of the linkage disc body. The linkage claws between the two linkage disc bodies corresponding to the same linkage elastic element are circumferentially staggered.

[0015] In the aforementioned engine dynamometer platform, the linkage elastic element is made of rubber or engineering plastic.

[0016] The outstanding advantages of this invention compared to the prior art are:

[0017] The invention features a clever and reasonable overall structural design with low cost. By employing a movable joint structure that allows for axial relative sliding and circumferential synchronous rotation between the linkage sleeve and the synchronous sleeve, the engine crankshaft can be protected from axial forces, effectively preventing engine damage. Attached image description:

[0018] Figure 1 This is a perspective view of the entire machine of the present invention;

[0019] Figure 2 This is a cross-sectional view of the entire machine of the present invention;

[0020] Figure 3 This is an exploded view of the structure between the crankshaft and the linkage bushing of the present invention;

[0021] Figure 4 This is a structural diagram of the gearbox assembly without a housing according to the present invention;

[0022] Figure 5 This is an exploded view of the structure between the linkage bushing and the input shaft of the gearbox assembly of the present invention.

[0023] In the diagram: 1. Vertical test bench; 2. Engine under test; 3. Linkage bushing; 4. Crankshaft; 5. Synchronous bushing; 6. Bearing housing; 7. Annular protrusion; 8. Positioning protrusion; 9. Bearing; 10. Positioning circlip; 11. Large ring; 12. Small ring; 13. Positioning seat; 14. Assembly screw; 15. Spline protrusion one; 16. Spline groove one; 17. Spline protrusion two; 18. Spline groove two; 19. Gearbox assembly; 20. Input shaft; 21. Output shaft; 22. Housing; 23. Drive gear; 24. Driven gear; 25. Fixing groove; 26. Fixing circlip; 27. Linkage elastic element; 28. Linkage groove; 29. ​​Linkage disc body; 30. Linkage claw. Detailed implementation method:

[0024] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —5:

[0025] The engine dynamometer platform includes a vertical frame 1, on which the engine to be tested 2 is fixedly fixed. A linkage sleeve 3 with a linkage insertion hole on its left end face is rotatably connected to the vertical frame 1. A synchronous sleeve 5 that can rotate synchronously is fitted on the right end of the crankshaft 4 of the engine to be tested 2. The synchronous sleeve 5 is inserted into the linkage insertion hole of the linkage sleeve 3, and the synchronous sleeve 5 and the linkage sleeve 3 can rotate synchronously in the circumferential direction and move relative to each other in the axial direction. The right end of the linkage sleeve 3 is in transmission engagement with the input end of the dynamometer.

[0026] The invention has a clever and reasonable overall structural design and low cost. By adopting a movable joint structure with axial relative sliding and circumferential synchronous rotation between the linkage sleeve 3 and the synchronous sleeve 5, the engine crankshaft 4 can be protected from axial forces, effectively avoiding engine damage.

[0027] Furthermore, in order to enable the linkage bushing 3 to rotate stably on the vertical frame 1 and effectively withstand the axial force, the vertical frame 1 is provided with an assembly through hole, into which a bearing seat 6 is inserted. One end of the bearing seat 6 extends out of the assembly through hole and forms an annular protrusion 7 along its radial direction. The annular protrusion 7 is fixed to the vertical frame 1 by fastening screws. The center of the inner hole of the bearing seat 6 extends radially inward to form a positioning protrusion 8. The linkage bushing 3 is rotatably connected to the bearing seat 6 by bearings 9. There are two bearings 9, which are respectively located on the left and right sides of the positioning protrusion 8. A positioning groove is provided on the inner wall of the bearing seat 6 on the side of the bearing 9 away from the positioning protrusion 8. A positioning snap ring 10 is provided in the positioning groove. An assembly space for axially fixing the bearing 9 is formed between the positioning snap ring 10 and the corresponding side wall of the positioning protrusion 8. That is, the two bearings 9 are arranged in both directions on both sides of the positioning protrusion 8, and the corresponding bearings 9 are axially fixed in the inner hole of the bearing seat 6 by means of the positioning snap ring 10, so that the linkage sleeve 3 can be stably rotated and fitted in the bearing seat 6, and the two bearings 9 can respectively bear the positive and negative bidirectional forces from the axial direction.

[0028] In order to ensure that the synchronous bushing 5 can be stably fitted onto the crankshaft 4 and can rotate synchronously with the crankshaft 4 in a stable circumferential direction, in this embodiment, the right end of the crankshaft 4 includes a large ring portion 11 and a small ring portion 12 from left to right. A positioning step is formed between the large ring portion 11 and the small ring portion 12. The synchronous bushing 5 is fitted onto the small ring portion 12, and the left end face of the synchronous bushing 5 abuts against the positioning step. A positioning seat 13 is provided on the right side of the synchronous bushing 5, which abuts against the right end face of the synchronous bushing 5. The tail end of the mounting screw 14 passes through the positioning seat 13 and is screwed to fix the right end face of the crankshaft 4. A spline protrusion 15 is provided on the outer wall surface of the small ring portion 12, and a spline through groove 16 that cooperates with the spline protrusion 15 is provided on the inner hole of the synchronous bushing 5.

[0029] Furthermore, in order to enable the synchronous bushing 5 and the linkage bushing 3 to achieve a sliding fit with each other in the axial direction and in the circumferential direction, the synchronous bushing 5 and the linkage bushing 3 can be configured as follows: an axial groove is provided on the outer wall of the synchronous bushing 5 along the axial direction, and a positioning slider that can slide on the axial groove is provided on the inner wall of the linkage bushing 3; in this embodiment, the specific fit structure between the synchronous bushing 5 and the linkage bushing 3 is as follows: a spline protrusion 17 is provided on the outer wall of the synchronous bushing 5, and a spline through groove 18 that cooperates with the spline protrusion 17 is provided on the linkage insertion hole of the linkage bushing 3.

[0030] In addition, in order to enable the engine crankshaft 4 to stably transmit power to the dynamometer, the right end of the linkage sleeve 3 is connected to the input shaft 20 of the gearbox assembly 19, and the output shaft 21 of the gearbox assembly 19 is connected to the input end of the dynamometer.

[0031] The gearbox assembly 19 can adopt other existing structures on the market. In this embodiment, the gearbox assembly 19 includes a housing 22 and an input shaft 20 and an output shaft 21 that are rotatably connected side by side on the housing 22. The input shaft 20 is provided with a drive gear 23, and the output shaft 21 is provided with a driven gear 24 that meshes with the drive gear 23.

[0032] Furthermore, to ensure that the input shaft 20, output shaft 21, drive gear 23, and driven gear 24 are standard components for easy maintenance and replacement, effectively reducing processing and repair costs, the input shaft 20 and output shaft 21 have identical structures. The output shaft 21 is equipped with a drive gear 23, and the driven gear 24 is fitted onto the drive gear 23 on the output shaft 21. The inner ring wall of the driven gear 24 has internal tooth grooves that engage with the teeth of the drive gear 23. Fixing grooves 25 are formed on the teeth of the drive gear 23 on both sides of the driven gear 24, and fixing springs 26 are fitted onto these grooves. The two fixing springs 26 form an axially fixed assembly space for the driven gear 24. In other words, the input shaft 20, output shaft 21, and drive gear 23 mounted on the input shaft 20 and output shaft 21 are standard components and can be interchanged.

[0033] To further reduce equipment costs, the input shaft 20 and output shaft 21 are integrated with the corresponding drive gear 23.

[0034] Furthermore, to ensure stable transmission between the linkage sleeve 3 and the input shaft 20, and between the output shaft 21 and the input end of the dynamometer, in this embodiment, the linkage sleeve 3 and the input shaft 20, and the output shaft 21 and the input end of the dynamometer are all connected by couplings. Specifically, the coupling has the following structure: a linkage elastic element 27 is provided between the right end of the linkage sleeve 3 and the input shaft 20, and between the output shaft 21 and the input end of the dynamometer. The outer edge of the dynamic elastic element 27 is provided with several circumferentially distributed linkage slots 28. The right end of the linkage sleeve 3, the corresponding end of the input shaft 20, the corresponding end of the output shaft 21, and the input end of the dynamometer are all provided with linkage disc body parts 29 corresponding to the structure of the linkage elastic element 27. The end face of the linkage disc body part 29 is provided with several circumferentially distributed linkage claws 30 that can be inserted into the linkage slots 28. The linkage claws 30 between two linkage disc body parts 29 corresponding to the same linkage elastic element 27 are circumferentially staggered. At the same time, the linkage elastic element 27 can be made of rubber or engineering plastic.

[0035] The above embodiments are merely one of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes made in accordance with the shape, structure and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An engine dynamometer platform, characterized in that: The test includes a vertical test stand (1), on which the engine to be tested (2) is fixed. A linkage bushing (3) with a linkage insertion hole on the left end face is rotatably connected to the vertical test stand (1). A synchronous bushing (5) that can rotate synchronously is fitted on the right end of the crankshaft (4) of the engine to be tested (2). The synchronous bushing (5) is inserted into the linkage insertion hole of the linkage bushing (3). The synchronous bushing (5) and the linkage bushing (3) can rotate synchronously in the circumferential direction and move relative to each other in the axial direction. The right end of the linkage bushing (3) is in transmission cooperation with the input end of the dynamometer. The right end of the crankshaft (4) includes a large ring (11) and a small ring (12) from left to right. A positioning step is formed between the large ring (11) and the small ring (12). The synchronous bushing (5) is fitted on the small ring (12), and the left end face of the synchronous bushing (5) abuts against the positioning step. A positioning seat (13) is provided on the right side of the synchronous bushing (5) and abuts against the right end face of the synchronous bushing (5). The tail end of the mounting screw (14) passes through the positioning seat (13) and is screwed to fix the right end face of the crankshaft (4). A spline protrusion (15) is provided on the outer wall of the small ring (12). A spline through groove (16) that cooperates with the spline protrusion (15) is opened on the inner hole of the synchronous bushing (5). The outer wall of the synchronous bushing (5) is provided with a spline protrusion 2 (17), and the linkage bushing (3) is provided with a spline through groove 2 (18) that cooperates with the spline protrusion 2 (17) on the linkage insertion hole.

2. The engine dynamometer platform according to claim 1, characterized in that: The vertical frame (1) is provided with an assembly through hole, into which a bearing seat (6) is inserted. One end of the bearing seat (6) extends out of the assembly through hole and forms an annular protrusion (7) along its radial direction. The annular protrusion (7) is fixed to the vertical frame (1) by fastening screws. The middle part of the inner hole of the bearing seat (6) extends radially inward to form a positioning protrusion (8). The linkage bushing (3) is rotatably connected to the bearing seat (6) through the bearing (9). There are two bearings (9) and they are located on the left and right sides of the positioning protrusion (8) respectively. A positioning groove is provided on the inner wall of the bearing seat (6) on the side of the bearing (9) away from the positioning protrusion (8). A positioning snap ring (10) is provided in the positioning groove. An assembly space for axially fixing the bearing (9) is formed between the positioning snap ring (10) and the corresponding side wall of the positioning protrusion (8).

3. The engine dynamometer platform according to claim 1, characterized in that: The right end of the linkage bushing (3) is connected to the input shaft (20) of the gearbox assembly (19), and the output shaft (21) of the gearbox assembly (19) is connected to the input end of the dynamometer.

4. The engine dynamometer platform according to claim 3, characterized in that: The gearbox assembly (19) includes a housing (22), and an input shaft (20) and an output shaft (21) rotatably connected side by side on the housing (22). The input shaft (20) is provided with a drive gear (23), and the output shaft (21) is provided with a driven gear (24) that meshes with the drive gear (23).

5. The engine dynamometer platform according to claim 4, characterized in that: The input shaft (20) has the same structure as the output shaft (21). The output shaft (21) is provided with a drive gear (23). The driven gear (24) is sleeved on the drive gear (23) of the output shaft (21). The inner ring wall of the driven gear (24) is provided with an internal tooth groove that engages with the teeth of the drive gear (23). Fixed grooves (25) are provided on the teeth of the drive gear (23) located on both sides of the driven gear (24). Fixed snap rings (26) are fitted on the fixed grooves (25). An assembly space for axially fixing the driven gear (24) is formed between the two fixed snap rings (26).

6. The engine dynamometer platform according to claim 5, characterized in that: The input shaft (20) and output shaft (21) are integrated with the corresponding drive gear (23).

7. The engine dynamometer platform according to claim 3, characterized in that: Linkage elastic elements (27) are provided between the right end of the linkage sleeve (3) and the input shaft (20), and between the output shaft (21) and the input end of the dynamometer. Several circumferentially distributed linkage slots (28) are provided on the outer edge of the linkage elastic element (27). The right end of the linkage sleeve (3), the corresponding end of the input shaft (20), the corresponding end of the output shaft (21), and the input end of the dynamometer are all provided with linkage disc body parts (29) corresponding to the structure of the linkage elastic element (27). Several circumferentially distributed linkage claws (30) that can be inserted into the linkage slots (28) are provided on the end face of the linkage disc body parts (29). The linkage claws (30) between the two linkage disc body parts (29) corresponding to the same linkage elastic element (27) are circumferentially staggered.

8. The engine dynamometer platform according to claim 7, characterized in that: The linkage elastic element (27) is made of rubber or engineering plastic.

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