A spline pair pulling device for a commercial vehicle transmission shaft

Abstract

The application relates to a spline pair pushing device for a commercial vehicle transmission shaft, which comprises a cylinder, the end of the cylinder is fixed with a first pushing plate, the movable shaft end of the cylinder is fixed with a second pushing plate, the first pushing plate and the second pushing plate are both provided with circular arc clamps, the opening directions of the two circular arc clamps are the same, and the connecting line between the centers of the two circular arc clamps is parallel to the movable shaft of the cylinder. The first pushing plate and the second pushing plate are installed at the two ends of the cylinder, the third pushing plate and the fourth pushing plate are installed at the two ends of the mechanical pushing mechanism, and the arc-shaped clamps are arranged on the pushing plates, so that the pushing plates can be clamped on the transmission shaft. When the cylinder acts, the first pushing plate and the second pushing plate push to the two ends, the torsion rod can be manually pulled, the lever action and the gear transmission effect are used, the pushing force of the device is increased, and the transmission shaft and the spline pair are pushed away from each other. The device is convenient to use, time-saving and labor-saving.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle driveshaft assembly technology, and in particular to a push-pull device for a splined pair of commercial vehicle driveshafts. Background Technology

[0002] A driveshaft is a rigid rod that connects two universal joints to transmit torque. Since the connection points of the universal joint transmission device in a car are frequently changing in position during driving, splines that can slide axially are often provided on the driveshaft to avoid motion interference and accommodate changes in the length of the driveshaft.

[0003] The splined assembly of the drive shaft consists of a retractable splined shaft and a splined sleeve. When installing the drive shaft, the splined assembly needs to be removed according to the actual situation. Because the splined assembly has high precision, small tolerance, and tight fit, the added grease plays a certain sealing role. Manually removing it is time-consuming and laborious, and using hammers or pry bars can easily damage the paint on the surface of the drive shaft.

[0004] Therefore, a push-pull device for the splined pair of a commercial vehicle drive shaft is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a push-pull device for the splined pair of a commercial vehicle drive shaft.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A push-pull device for a splined pair of a commercial vehicle drive shaft includes a cylinder, a first push plate is fixed at the end of the cylinder, and a second push plate is fixed at the movable shaft end of the cylinder. Both the first push plate and the second push plate are provided with arc-shaped slots. The opening directions of the two arc-shaped slots are the same, and the connecting line between the centers of the two arc-shaped slots is parallel to the movable shaft of the cylinder.

[0007] Preferably, the above-mentioned commercial vehicle drive shaft spline pair push-pull device further includes a mechanical push-pull mechanism. The mechanical push-pull mechanism includes a housing, inside which are arranged two sets of gear transmission assemblies. A toothed plate is arranged between the two sets of gear transmission assemblies. The toothed plate is slidably connected to the housing. Both sides of the toothed plate are provided with transmission teeth, which are convexly connected to the gear transmission assemblies. A push rod is fixed to one end of the toothed plate. The push rod passes through the housing and is slidably connected. A fourth push plate is fixed to the end of the push rod.

[0008] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, each of the gear transmission components includes a first gear, a second gear, and a torsion bar. The first gear meshes with the second gear, the number of teeth of the first gear is greater than the number of teeth of the second gear, and one end of the torsion bar is provided with an arc-shaped rack that extends into the housing. The arc-shaped rack is hinged to the housing.

[0009] Preferably, in the above-described commercial vehicle drive shaft spline pair push-pull device, the first gear meshes with the drive gear.

[0010] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, a third push plate is fixed on the side of the housing, the third push plate and the fourth push plate are parallel to each other, and both the third push plate and the fourth push plate are provided with arc-shaped bayonet openings.

[0011] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, a handle is installed on the top of the cylinder.

[0012] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, the two sets of gear transmission components are symmetrical about the gear plate.

[0013] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, the cylinder is connected to a manual valve via an air pipe, and the cylinder's movement is controlled by the manual valve.

[0014] Preferably, in the above-mentioned commercial vehicle drive shaft spline pair push-pull device, the first push plate, the second push plate, and the handle are made of 45 steel.

[0015] The beneficial effects of this invention are as follows: By installing a first and a second push plate at both ends of the cylinder, and a third and a fourth push plate at both ends of the mechanical pushing mechanism, and by providing arc-shaped slots on each push plate, it is easy to lock the cylinder onto the drive shaft. When the cylinder actuates, it pushes the cylinder to both ends via the first and second push plates. Furthermore, the thrust of the device can be increased by manually operating the torsion bar, utilizing leverage and gear transmission, thereby pushing the drive shaft and splined joint apart. This device is convenient, time-saving, and labor-saving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the connection structure between the cylinder and the first and second push plates.

[0018] Figure 3 This is a three-dimensional view of the first push plate;

[0019] Figure 4This is a front view of the second push plate;

[0020] Figure 5 This is a schematic diagram of the mechanical push mechanism;

[0021] Figure 6 This is a front view of the first push plate;

[0022] Figure 7 for Figure 1 Top view.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Spline pair, 2. Drive shaft, 3. Cylinder, 4. Mechanical push mechanism, 41. Housing, 42. Third push plate, 43. Fourth push plate, 44. First gear, 45. Torsion bar, 46. Arc rack, 47. Second gear, 48. Gear plate, 49. Transmission gear, 410. Push rod, 411. Through hole, 5. Handle, 6. First push plate, 7. Second push plate. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] like Figure 1 - Figure 5 As shown, a push-pull device for a splined driveshaft of a commercial vehicle includes a cylinder body. A comparison of three cylinder bodies—servo electric cylinder, hydraulic cylinder, and pneumatic cylinder—shows that all meet the requirements in terms of pressure stability and stroke controllability. Considering that hydraulic cylinders require a separate hydraulic pump, which is inconvenient, and that compressed air interfaces are available on the production line, cylinder 3 was ultimately selected as the optimal cylinder body. This cylinder 3 has a cylinder body diameter of 50mm, a rotation diameter of 75mm, a piston rod diameter of 20mm, a stroke of 80mm, a force-bearing area of ​​19.36 square centimeters, and an output force of up to 400N.

[0027] The air inlet and exhaust ports of cylinder 3 are connected to control valves via air pipes. Comparing manual control valves and solenoid valves, it was found that solenoid valves require power, open and close rapidly, have high sensitivity, but low safety. Manual valves open and close slowly, have low sensitivity, but are relatively safe. Therefore, a manual valve, such as the 4H210-08 two-position five-way manual valve, was ultimately selected as the optimal control valve.

[0028] A first push plate 6 is bolted to the end of cylinder 3. The first push plate 6 has two round holes for bolts to pass through, and a threaded hole at the end of cylinder 3. When installing and fixing the first push plate 6, a detachable connection can be made by inserting bolts into the round holes and threaded holes. A second push plate 7 is fixed to the movable shaft end of cylinder 3. Comparing mechanical and fixed push plates, it was found that the mechanical push plate is bulky, complex in structure, and requires a power device to control the clamping jaws. The fixed push plate has a simple structure and can be directly fixed to the cylinder. Therefore, the fixed push plate was ultimately selected as the optimal push plate structure. Both the first push plate 6 and the second push plate 7 have arc-shaped latches, both facing downwards. The diameter of these arc-shaped latches is consistent with the inner diameter of the spline pair 1. A handle 5 is installed on the top of cylinder 3. By comparing Q235 carbon steel, 45 steel, and 1100 aluminum alloy, it was found that all three materials meet the requirements in terms of strength, plasticity, and processing performance. Considering the poor heat treatment performance of Q235 and the difficulty of welding 1100 aluminum alloy using ordinary methods, 45 steel, with its optimal comprehensive performance, was chosen as the best material. Therefore, 45 steel was used to make the push plate and the handle.

[0029] One end of the spline structure of the drive shaft 2 is inserted into the spline pair 1, and the other end of the drive shaft 2 is stepped. In use, by holding the handle 5, one arc-shaped locking slot is engaged with one end face of the spline pair 1, and the arc-shaped locking slot is engaged with the drive shaft 2; the other arc-shaped locking slot is engaged with the stepped surface of the drive shaft 2. Specifically, the first push plate 6 and the second push plate 7 are used to push the spline pair 1 and the drive shaft 2 to both sides. The first push plate 6 is bent to facilitate the engagement of the two arc-shaped locking slots between the end face of the spline pair 1 and the stepped surface of the drive shaft 2. The connecting line between the centers of the two arc-shaped locking slots is parallel to the movable shaft of the cylinder 3. The first push plate 6 is provided with a bending structure, the bending length of which can be determined according to the actual situation to ensure that the distance between the arc-shaped locking slots of the two push plates is the locking distance of the drive shaft 2.

[0030] When cylinder 3 is activated, the cylinder's movable shaft pushes the second push plate 7 open, and the first push plate 6 at the other end also applies force in the other direction, thereby separating the drive shaft 2 and the spline pair 1.

[0031] Because the adhesive force between the drive shaft 2 and the spline pair 1 is strong during the initial separation stage, a mechanical pushing mechanism 4 can be used to increase the thrust during the initial stage. Figure 1 , Figure 5As shown, the mechanical pushing mechanism 4 includes a housing 41. Inside the housing 41 are two sets of gear transmission assemblies, with a toothed plate 48 positioned between them. The two sets of gear transmission assemblies are symmetrical about the toothed plate 48. Slide rails are provided on both the upper and lower sides of the inner wall of the housing 41, and the toothed plate 48 is slidably connected to these slide rails. Transmission teeth 49 are provided on both sides of the toothed plate 48. Each gear transmission assembly includes a first gear 44, a second gear 47, and a torsion bar 45. The first gear 44 meshes with the second gear 47, and the number of teeth on the first gear 44 is greater than the number of teeth on the second gear 47. One end of the torsion bar 45 is provided with an arc-shaped rack 46, which is located inside the housing 41 and hinged to the housing 41. The other end of the torsion bar 45 extends to the outside through through holes 411 on both sides of the housing 41. The first gear 44 meshes with the transmission teeth 49. A push rod 410 is fixed to one end of the toothed plate 48. The push rod 410 passes through the housing 41 and is slidably connected. A fourth push plate 43 is fixed to the end of the push rod 410. A third push plate 42 is fixed to the side of the housing 41. The third push plate 42 and the fourth push plate 43 are parallel to each other, and both the third push plate 42 and the fourth push plate 43 are provided with arc-shaped latches, which are consistent with the arc-shaped latches on the first push plate 6 and the second push plate 7. The distance between the third push plates 42 is less than the distance between the first push plate 6 and the second push plate 7. During operation, only one torsion bar 45 needs to be turned, and the other torsion bar 45 will move in tandem. At the same time, both torsion bars 45 can be operated from either side.

[0032] Working principle: In use, the third pressing plate 42 on the mechanical pushing mechanism 4 can be locked onto the transmission shaft 2, and the first pressing plate 6 and the second pressing plate 7 can be locked onto both sides of the third pressing plate 42. The cylinder 3 actuates, and simultaneously, by manually operating the torsion bar 45, the mechanical pushing mechanism 4 pushes the third pressing plate 42 to both sides, thereby increasing the thrust of the first pressing plate 6 and the second pressing plate 7. Since the number of teeth on the first gear 44 is greater than that on the second gear 47, and due to the lever effect of the torsion bar 45, the overall thrust is effectively increased. This facilitates the separation of the transmission shaft 2 and the splined pair 1.

[0033] The device was validated in production lines 8 and 9 of a commercial vehicle factory. After the experiment, the number of unsatisfactory pull-out defects in the driveshaft spline pair decreased from 2000 PPM to 0. In terms of economic benefits, the development of the driveshaft spline pair push-out device reduced costs associated with defect assessments and labor service fees by over 50,000 RMB per year. It also reduced customer complaints and improved customer satisfaction.

[0034] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A push-pull device for a splined pair of a commercial vehicle driveshaft, characterized in that: The system includes a cylinder (3), with a first push plate (6) fixed to the end of the cylinder (3) and a second push plate (7) fixed to the movable shaft end of the cylinder (3). Both the first push plate (6) and the second push plate (7) are provided with arc-shaped slots. The opening directions of the two arc-shaped slots are the same, and the connecting line between the centers of the two arc-shaped slots is parallel to the movable shaft of the cylinder (3). The system also includes a mechanical pushing mechanism (4), which includes a housing (41). The housing (41) has two sets of gear transmission components inside, and a toothed plate (48) is provided between the two sets of gear transmission components. The toothed plate (48) is slidably connected to the housing (41), and transmission teeth (49) are provided on both sides of the toothed plate (48). 49) It is connected to the gear transmission assembly. One end of the tooth plate (48) is fixed with a push rod (410). The push rod (410) passes through the housing (41) and is slidably connected. The end of the push rod (410) is fixed with a fourth push plate (43). Each gear transmission assembly includes a first gear (44), a second gear (47), and a torsion bar (45). The first gear (44) meshes with the second gear (47). The number of teeth of the first gear (44) is greater than the number of teeth of the second gear (47). One end of the torsion bar (45) is provided with an arc-shaped rack (46) and extends into the housing (41). The arc-shaped rack (46) is hinged to the housing (41). The first gear (44) meshes with the transmission tooth (49).

2. The commercial vehicle drive shaft spline pair push-pull device according to claim 1, characterized in that: A third push plate (42) is fixed to the side of the housing (41). The third push plate (42) and the fourth push plate (43) are parallel to each other. Both the third push plate (42) and the fourth push plate (43) are provided with arc-shaped slots.

3. The push-pull device for the splined pair of the commercial vehicle drive shaft according to claim 1, characterized in that: A handle (5) is mounted on the top of the cylinder (3).

4. The commercial vehicle drive shaft spline pair push-pull device according to claim 1, characterized in that: The two sets of gear transmission components are symmetrical about the gear plate (48).

5. The push-pull device for the splined pair of the commercial vehicle drive shaft according to claim 1, characterized in that: The cylinder (3) is connected to a manual valve via an air pipe, and the action of the cylinder (3) is controlled by the manual valve.

6. The commercial vehicle driveshaft spline pair push-pull device according to claim 3, characterized in that: The first push plate (6), the second push plate (7), and the handle (5) are made of No. 45 steel.

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