Spindle bearing press-fitting mechanism for manual front-wheel drive car transmission shift mechanism assembly

Abstract

The camshaft of the embodiment of the present invention is a kind of main shaft bearing press-fitting mechanism of manual front-wheel drive car transmission shift mechanism assembly, comprises a base plate, a shaft pad, a pressure head, two cylinders and two housing pads. A positioning through hole is arranged in the middle of the base plate. The middle part of the shaft pad is a radially extending positioning boss. The shaft section at the lower end of the shaft pad is interference fit with the positioning through hole on the base plate. The upper end of the shaft pad is provided with an axially extending positioning groove, which is used for positioning the shaft of the shift assembly. The two housing pads are slidably fitted on the upper end of the base plate and are located on both sides of the shaft pad. The upper end surface height of the housing pad is higher than the upper end surface height of the positioning boss of the shaft pad, which is used for initial positioning of the housing of the shift assembly. The two cylinders are fixedly mounted on both ends of the base plate respectively. The piston rod of each cylinder is connected to a housing pad. The pressure head is located above the shaft pad. The pressure head and the shaft pad are on the same axial center line. The lower end surface of the pressure head is provided with an axially extending hole for making way for the small diameter end of the shaft of the shift assembly.

Description

Technical Field

[0001] The invention relates to the technical field of bearing press-fitting, and in particular to a main shaft bearing press-fitting mechanism of a manual front-drive car transmission shift mechanism assembly. Background Art

[0002] In modern society, cars have become an indispensable means of transportation for most people, accelerating the development of the entire society. The parts and components that enable cars to operate stably are key parts and components, and the transmission is one of the most important parts. Bearings play a connecting role in the transmission. They can carry loads, reduce the friction coefficient during movement, and also play a fixed supporting role for shaft parts. The life and quality of bearings are very important, which is related to the safety of automobile operation. The assembly quality of bearings is directly related to the performance of the transmission. Therefore, the assembly requirements of bearings are very high. In the assembly of the transmission, the bearing needs to be pressed onto the shaft. As far as the current situation is concerned, many of them are manually assembled. Generally, the shaft parts are straightened first, and then the shaft parts are knocked with external force to send the shaft parts into the inner edge of the bearing by knocking. Manual assembly has the following disadvantages: large human error and poor quality consistency; low one-time qualified rate, poor coaxiality after connection, and even damage to the bearing during installation; high labor intensity of workers and low efficiency of manual press-fitting. Therefore, it is very necessary to design a bearing press-fitting mechanism to replace manual press-fitting with machine press-fitting. Summary of the invention

[0003] In order to solve the problems existing in the above prior art, the present invention provides a main shaft bearing press-fitting mechanism for a manual front-wheel drive car transmission shift mechanism assembly, which can realize machine press-fitting, is more efficient, has better quality and higher qualified rate than manual press-fitting. The technical solution of the present invention is as follows:

[0004] The camshaft of the embodiment of the present invention is a kind of main shaft bearing press-fitting mechanism of manual front-wheel drive car transmission shift mechanism assembly, comprises a base plate, a shaft pad, a pressure head, two cylinders and two housing pads, the middle part of the base plate is provided with a positioning through hole, the middle part of the shaft pad is a radially extending positioning boss, the shaft section at the lower end of the shaft pad is interference fit with the positioning through hole on the base plate, the upper end of the shaft pad is provided with an axially extending positioning groove, the positioning groove is used for positioning the shaft of the shift assembly, the two housing pads are slidingly fitted on the upper end of the base plate and are located on both sides of the shaft pad, the upper end surface height of the housing pad is higher than the upper end surface height of the positioning boss of the shaft pad, which is used for initial positioning of the housing of the shift assembly, the two cylinders are fixedly mounted on both ends of the base plate respectively, the piston rod of each cylinder is connected to a housing pad, the pressure head is located above the shaft pad, the pressure head and the shaft pad are on the same axial center line, and the lower end surface of the pressure head is provided with an axially extending hole to make way for the small diameter end of the shaft of the shift assembly.

[0005] A boss is arranged in the middle of the bottom plate, the positioning through hole is located in the boss, a guide slot is arranged on the boss, and the shell cushion block is slidably fitted in the guide slot.

[0006] A sleeve is fixedly connected to the piston rod of the cylinder, and the sleeve is engaged with a T-slot provided on the shell cushion block through a flange provided thereon.

[0007] The positioning boss on the shaft pad is provided with a plurality of countersunk holes, and countersunk screws are passed through the countersunk holes to be connected and fixed with the threaded through holes provided on the bottom plate.

[0008] The lower end surface of the pressure head is provided with an annular groove, and the two side walls of the annular groove respectively correspond to the inner ring and the outer ring of the bearing to be assembled, and the side wall of the orifice end of the axial extension hole of the pressure head is provided with a degassing groove.

[0009] A mounting bracket is provided on the shell of the cylinder, and the mounting bracket is fixedly connected to the bottom plate by screws.

[0010] The two cylinders are mounted on the bottom plate in an axially symmetrical manner, and the two housing cushion blocks are centrally symmetrical about the axis center line of the shaft cushion block.

[0011] The pressing head is mounted on a pressing machine main shaft.

[0012] The two shell gaskets are of the same height, and the height error is less than 0.001 mm.

[0013] The depth of the axially extending hole on the pressure head is greater than the length of the small diameter end of the gear shift assembly shaft.

[0014] The above-mentioned technical scheme adopts: it includes a base plate, a shaft pad, a pressure head, two cylinders, and two housing pads. A positioning through hole is provided in the middle of the base plate, and the middle part of the shaft pad is a radially extending positioning boss. The shaft section at the lower end of the shaft pad is interference fit with the positioning through hole on the base plate, and an axially extending positioning groove is provided at the upper end of the shaft pad. The positioning groove is used to position the shift assembly shaft. The two housing pads are slidably fitted on the upper end of the base plate and are located on both sides of the shaft pad. The upper end surface height of the housing pad is higher than the upper end surface height of the positioning boss of the shaft pad, which is used for initial positioning of the shift assembly housing. The two cylinders are respectively fixedly mounted on both ends of the base plate, and the piston rod of each cylinder is connected to a housing pad. The pressure head is located above the shaft pad, and the pressure head and the shaft pad are on the same axial center line. The lower end surface of the pressure head is provided with an axially extending hole to make way for the small diameter end of the shift assembly shaft. The shift assembly housing is supported by the housing gasket, and the pressure head is pressed downward. With the axial extension hole making way, the pressure head can press the bearing to be assembled into the shift assembly housing, so that the outer ring of the bearing and the shift assembly housing have an interference fit. Driven by the cylinder piston rod, the housing gasket can be pulled out from under the shift assembly housing, so that the shift assembly housing is suspended, making way for the pressure head to press down again. When the pressure head is pressed down again, the inner ring of the bearing and the shift assembly shaft can be pressed tightly, so that the inner ring of the bearing and the shift assembly shaft have an interference fit, thereby completing the press-fitting of the bearing. This machine press-fitting method has high press-fitting efficiency, and the bearing is not easily damaged during the press-fitting process. The pressed-fitted products are of good quality, high coaxiality, guaranteed consistency, high qualified rate, low scrap rate, and also reduce the work intensity of workers.

[0015] A boss is provided in the middle of the base plate. In order to match the height of the piston rod in the cylinder, the positioning through hole is located in the boss. A guide groove is provided on the boss. The shell gasket is slidably fitted in the guide groove. The guide groove guides the movement of the shell gasket.

[0016] A sleeve is fixedly connected to the piston rod of the cylinder, and the sleeve is engaged with the T-slot provided on the shell cushion block through a flange provided thereon, so that the piston rod can drive the shell cushion block to reciprocate.

[0017] The positioning boss on the shaft pad is provided with a plurality of countersunk holes, and countersunk screws are passed through the countersunk holes to connect and fix with the threaded through holes provided on the bottom plate, so as to strengthen the connection between the shaft pad and the bottom plate.

[0018] The lower end surface of the pressure head is provided with an annular groove, and the two side walls of the annular groove respectively correspond to the inner ring and outer ring of the bearing to be assembled, so as to facilitate pressing the bearing downward. The side wall of the orifice end of the axial extension hole of the pressure head is provided with a venting groove, and the venting groove and the annular groove both play the role of exhausting when the pressure head is pressed downward.

[0019] A mounting bracket is provided on the shell of the cylinder, and the mounting bracket is fixedly connected to the bottom plate by screws, so as to facilitate disassembly and assembly.

[0020] The two housing pads are of equal height, with a height error of less than 0.001 mm, so that the shift assembly housing can be stably placed thereon for easy press-fitting.

[0021] The depth of the axially extending hole on the pressure head is greater than the length of the small diameter end of the shift assembly shaft so that the bearing can be pressed into place.

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 is a schematic diagram of the structure of the base plate;

[0026] Figure 4 for Figure 3 Left view of

[0027] Figure 5 It is the structural schematic diagram of the cylinder;

[0028] Figure 6 It is a structural schematic diagram of the shaft pad;

[0029] Figure 7 It is a structural schematic diagram of the shell gasket;

[0030] Figure 8 This is the axonometric view of the shell pad;

[0031] Fig. 9 It is a structural diagram of the looper;

[0032] Fig.10 for Fig. 9 BB direction view;

[0033] Fig.11 It is the structural schematic diagram of the pressure head;

[0034] Fig.12 It is a schematic diagram of the structure of the gear shift assembly shaft. DETAILED DESCRIPTION

[0035] An embodiment of the main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly of the present invention:

[0036] See also Figure 1-Figure 12A spindle bearing press-fitting mechanism for a manual front-drive car transmission shift mechanism assembly includes a base plate 1, a shaft pad 5, a pressure head 7, two cylinders 2 controlled by electromagnetic valves, and two housing pads 4. In order to match the height of the piston rod in the cylinder 2, a boss 13 is provided in the middle of the base plate 1, a positioning through hole 14 is provided in the middle of the boss 13, and a guide slot 19 is provided on the boss 13. The housing pad 4 slides in the guide slot 19. The direction of the guide slot 19 is the same as the movement direction of the piston rod in the cylinder 2, which guides the movement of the housing pad 4. The middle part of the shaft pad 5 is a radially extending positioning boss 52. The lower end shaft section of the shaft pad 5 is interference-fitted with the positioning through hole 14 on the base plate 1. The positioning boss 52 on the shaft pad 5 is provided with a plurality of countersunk holes 55. Countersunk screws are passed through the countersunk holes 55 to connect and fix with the threaded through holes provided on the base plate 1, which can strengthen the connection between the shaft pad 5 and the base plate 1. The upper end of the shaft pad 5 is provided with an axially extending positioning groove 54, which is used to position the shift assembly shaft 8. The shift assembly shaft 8 is a stepped shaft, and the large diameter end 81 of the shift assembly shaft 8 is provided with a radially extending positioning arm 83. The side wall of the positioning groove 54 is provided with a positioning opening 53, and the positioning arm 83 is stuck in the positioning opening 53 to form the circumferential positioning of the shift assembly shaft 8, so as to prevent the shift assembly shaft 8 from rotating during press-fitting. The two housing pads 4 are centrally symmetrical about the axis of the shaft pad 5, and the upper end surface height H of the housing pad 4 is higher than the upper end surface height h of the positioning boss 52 of the shaft pad 5, which is used for the initial positioning of the shift assembly housing 9. The two housing pads 4 are of equal height, and the height error is less than 0.001 mm, so that the shift assembly housing 9 can be placed thereon stably for easy press-fitting. The two cylinders 2 are axially symmetrically mounted at both ends of the base plate 1. The housings of the two cylinders 2 are provided with mounting brackets 21. The mounting brackets 21 are fixedly connected to the base plate 1 by screws 10, which are convenient for disassembly and assembly. The piston rod of each cylinder 2 is fixedly connected to a sleeve 3 by an external thread 22. The sleeve 3 is engaged with the T-slot 43 of the housing cushion block 4 by a flange 32, so that the piston rod can drive the housing cushion block 4 to reciprocate. The pressure head 7 is mounted on a press spindle by screws. The pressure head 7 is located above the shaft cushion block 5. The pressure head 7 and the shaft cushion block 5 are on the same axis. The lower end surface of the pressure head 7 is provided with an axial extension hole 75 for making way for the small diameter end 82 of the shift assembly shaft 8, so as to make way for the shift assembly shaft 8 when the pressure head 7 is pressed down. The hole depth of the axial extension hole 75 is greater than the length of the small diameter end 82 of the shift assembly shaft 8, so that the bearing 6 can be pressed into place. The lower end surface of the pressure head 7 is also provided with an annular groove 74, and the two side walls of the annular groove 74 respectively correspond to the inner ring and outer ring of the bearing 6 to be assembled, so as to facilitate pressing the bearing 6 downward. The side wall of the orifice end of the axial extension hole 75 of the pressure head 7 is provided with a venting groove 73, and the venting groove 73 and the annular groove 74 both play the role of exhausting when the pressure head 7 is pressed downward.The base plate 1, the looper 3, the housing pad 4, the shaft pad 5, and the pressure head 7 are made of 45 steel with a quenching hardness of 40-45HRC. The two sides of the housing pad 4 are matched with the two sides of the guide slot 19 with a small clearance, and the matching clearance does not exceed 0.05mm. The small diameter end 82 of the shift assembly shaft 8 can be divided into two sections according to the slightly different diameters. The upper section is the guide section with a negative diameter tolerance, and the lower section is the fastening section with a positive diameter tolerance.

[0037] When in use, first place the shift assembly shaft 8 in the positioning groove 54 of the shaft cushion block 5, and make the positioning arm 83 of the shift assembly shaft 8 stuck in the positioning port 53 of the positioning groove 54 to form the circumferential positioning of the shift assembly shaft 8, then control the cylinder 2 through the solenoid valve to make the piston rod push out the housing cushion block 4, then sleeve the shift assembly housing 9 outside the shift assembly shaft 8 and place it on the upper end surface of the housing cushion block 4, then sleeve the bearing 6 on the top of the small diameter end 82 of the shift assembly shaft 8, then press the pressure head 7 downward to press the bearing 6 is pressed into the shift assembly housing 9, so that the outer ring of the bearing 6 and the shift assembly housing 9 have an interference fit. So far, the bearing 6 is in the guide section of the small diameter end 82 of the shift assembly shaft 8. Then the piston rod of the cylinder 2 pulls the housing gasket 4 from under the shift assembly housing 9, so that the shift assembly housing 9 is suspended. Then the pressure head 7 is pressed down again, and the bearing 6 is pressed to the fastening section of the small diameter end 82 of the shift assembly shaft 8 until the shaft shoulder, so that the inner ring of the bearing 6 and the small diameter end 82 of the shift assembly shaft 8 have an interference fit. At this point, the bearing 6 is pressed.

Claims

1. A main shaft bearing press-fitting mechanism for a manual front-wheel drive car transmission shift mechanism assembly, characterized in that: The invention comprises a base plate (1), a shaft pad (5), a pressure head (7), two cylinders (2), and two housing pads (4); a positioning through hole (14) is provided in the middle of the base plate (1); a radially extending positioning boss (52) is provided in the middle of the shaft pad (5); a shaft section at the lower end of the shaft pad (5) is interference fit with the positioning through hole (14) on the base plate (1); an axially extending positioning groove (54) is provided at the upper end of the shaft pad (5); the positioning groove (54) is used to position the shift assembly shaft (8); the two housing pads (4) are slidably fitted on the upper end of the base plate (1); Located on both sides of the shaft pad (5), the upper end surface height of the housing pad (4) is higher than the upper end surface height of the positioning boss (52) of the shaft pad (5), and is used for initial positioning of the shift assembly housing (9). The two cylinders (2) are respectively fixedly mounted on the two ends of the base plate (1), and the piston rod of each cylinder (2) is connected to a housing pad (4). The pressure head (7) is located above the shaft pad (5), and the pressure head (7) and the shaft pad (5) are on the same axis. The lower end surface of the pressure head (7) is provided with an axial extension hole (75) for making way for the small diameter end (82) of the shift assembly shaft (8).

2. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: A boss (13) is provided in the middle of the base plate (1), the positioning through hole (14) is located in the boss (13), a guide slot (19) is provided on the boss (13), and the housing cushion block (4) is slidably fitted in the guide slot (19).

3. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: A sleeve (3) is fixedly connected to the piston rod of the cylinder (2), and the sleeve (3) is engaged with a T-slot (43) provided on the housing cushion block (4) via a flange (32) provided thereon.

4. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The positioning boss (52) on the shaft pad (5) is provided with a plurality of countersunk holes (55), and countersunk screws are passed through the countersunk holes (55) to connect and fix with threaded through holes provided on the base plate (1).

5. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The lower end surface of the pressure head (7) is provided with an annular groove (74), and the two side walls of the annular groove (74) respectively correspond to the inner ring and the outer ring of the bearing (6) to be assembled, and the side wall of the orifice end of the axial extension hole (75) of the pressure head (7) is provided with a degassing groove (73).

6. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: A mounting bracket (21) is provided on the shell of the cylinder (2), and the mounting bracket (21) is fixedly connected to the base plate (1) via screws (10).

7. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The two cylinders (2) are mounted on the base plate (1) in an axisymmetric manner, and the two housing cushion blocks (4) are centrally symmetrical about the axis center line of the shaft cushion block (5).

8. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The pressing head (7) is mounted on a press main shaft.

9. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The two housing gaskets (4) are of equal height, with a height error of less than 0.001 mm.

10. The main shaft bearing press-fitting mechanism of the manual front-wheel drive car transmission shift mechanism assembly according to claim 1, characterized in that: The depth of the axially extending hole (75) on the pressure head (7) is greater than the length of the small diameter end (82) of the gear shift assembly shaft (8).

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