Two-speed gearbox for scraping and burnishing machine

Abstract

This utility model relates to a two-speed gearbox for a scraping and tumbling machine, comprising a housing, within which a power input shaft, a transition shaft, and a power output shaft are rotatably mounted. A driving gear is mounted on the power input shaft, a driven gear meshing with the driving gear is mounted on the transition shaft, and a first output gear and a second output gear are sequentially mounted on the power output shaft. A double gear is slidably mounted on the transition shaft. A shifting mechanism is mounted on the housing, comprising a rotating shaft, with a rocker arm fixedly connected to the outer end of the rotating shaft outside the housing, and a rocker rod fixedly connected to the inner end of the rotating shaft inside the housing. A shift fork is rotatably mounted on the upper end of the rocker rod, engaging the double gear with either the first or second output gear. This utility model achieves gear engagement and transmission by rotating the rotating shaft, which drives the rocker rod to move the shift fork along the transition shaft, thus enabling the double gear to mesh with either the first or second output gear. The structure is simple, and gear shifting is fast and accurate.

Description

Technical Field

[0001] This utility model relates to the field of scraping and tumbling machine technology, and in particular to a two-speed gearbox for scraping and tumbling machines. Background Technology

[0002] The scraping and burnishing machine is suitable for machining cylindrical deep-hole workpieces, employing a combination of boring and burnishing processes. During boring, the workpiece remains stationary while the boring bar rotates. Burnishing is divided into forward-pull burnishing and backward-pull burnishing, utilizing a high-speed scraping and burnishing head, resulting in high production efficiency.

[0003] Scraping and burnishing machines can complete initial boring, semi-finish boring, finish boring, and burnishing of the inner hole of a workpiece in one operation. However, different boring processes require different boring bar speeds. Especially when dealing with materials of varying hardness, the boring bar speed needs to be adjustable in real time to ensure machining accuracy.

[0004] The boring tool speed is adjusted using a gearbox. The gearbox uses its shifting mechanism to achieve meshing transmission between different gears, thus regulating the speed. Existing gearboxes employ cumbersome shifting mechanisms with high manufacturing requirements, leading to increased product costs. Therefore, it is necessary to optimize the gearbox shifting structure to reduce costs. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a two-speed gearbox for a scraping and tumbling machine with a simplified structure and quick and convenient gear shifting.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a two-speed gearbox for a scraping and tumbling machine, comprising a housing, a power input shaft, a transition shaft parallel to the power input shaft, and a power output shaft parallel to the transition shaft, all rotatably mounted inside the housing. A drive gear is mounted on the power input shaft, a driven gear meshing with the drive gear is mounted on the transition shaft, and a first output gear and a second output gear are sequentially mounted on the power output shaft. A double gear is slidably mounted on the transition shaft. A shifting mechanism is mounted on the housing, comprising a rotating shaft, a rocker arm fixedly connected to the outer end of the rotating shaft outside the housing, and a rocker rod fixedly connected to the inner end of the rotating shaft inside the housing. A shift fork is rotatably mounted on the upper end of the rocker rod, and the shift fork engages with the double gear on the side of the double gear to drive it to mesh with the first or second output gear.

[0007] Specifically, a motor mount is fixed to the upper surface of the housing, and a drive motor is mounted on the motor mount. The drive motor is connected to the power input shaft via belt drive.

[0008] Furthermore, the shifting mechanism includes a cylinder mounted on the outer wall of the housing, a cylinder seat fixed on the outer wall of the housing, the cylinder mounting end hinged to the cylinder seat, and the cylinder piston rod hinged to the end of the rocker arm.

[0009] To reduce friction between the shift fork and the double gear during gear shifting, the shift fork has a groove-shaped structure with its opening facing the double gear. Rollers are rotatably mounted on the front surfaces of both sides of the shift fork, and the outer circumferential surface of the rollers protrudes from the inner side of the shift fork and is clearance-fitted with the two sides of the double gear.

[0010] To ensure accurate gear shifting, a first proximity switch and a second proximity switch are installed on the outer wall of the gearbox. When the double gear meshes with the first output gear, the first proximity switch is aligned with the bottom of the swing arm, and when the double gear meshes with the second output gear, the second proximity switch is aligned with the bottom of the swing arm.

[0011] Furthermore, to prevent excessive movement of the double gears during gear shifting, which could affect the meshing accuracy between the gears, a right-angle seat is fixed on the outer wall of the housing, and a limit rod is fixed on the right-angle seat to hold the swing arm against the swing arm when it swings down to its limit position.

[0012] The beneficial effects of this utility model are: by rotating the shaft, the rocker arm drives the shift fork to hold the double gear on the transition shaft, thereby realizing the meshing transmission between the double gear and the first output gear or the second output gear. The structure is simple and the gear shifting is fast and accurate. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model after the box body has been removed.

[0016] Figure 3 This is an enlarged structural schematic diagram of the shifting mechanism described in this utility model.

[0017] In the diagram: 1. Housing, 2. Power input shaft, 3. Transition shaft, 4. Power output shaft, 5. Drive gear, 6. Driven gear, 7. First output gear, 8. Second output gear, 9. Double gear, 10. Rotating shaft, 11. Swing arm, 12. Swing rod, 13. Shift fork, 14. Motor mount, 15. Drive motor, 16. Belt drive, 17. Cylinder, 18. Cylinder mount, 19. Roller, 20. First proximity switch, 21. Second proximity switch, 22. Right-angle mount, 23. Limit rod. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] like Figure 1 , Figure 2 The two-speed gearbox of the scraping and tumbling machine shown includes a housing 1, a motor base 14 fixed on the upper surface of the housing 1, a drive motor 15 mounted on the motor base 14, and a power input shaft 2, a transition shaft 3 and a power output shaft 4 rotatably mounted inside the housing 1. The drive motor 15 is connected to the power input shaft 2 via a belt drive 16.

[0020] A drive gear 5 is mounted on the power input shaft 2. A driven gear 6, which meshes with the drive gear 5, is mounted on the transition shaft 3 via a flat key. A spline extending axially along the transition shaft 3 is provided on the outer periphery of the transition shaft 3 at the front end of the driven gear 6. A double gear 9 is slidably mounted on the transition shaft 3 via the spline. The double gear 9 includes a left gear and a right gear, wherein the diameter of the left gear of the double gear 9 is larger than the diameter of the right gear. A first output gear 7 and a second output gear 8 are sequentially mounted on the power output shaft 4. The diameter of the first output gear 7 is larger than that of the second output gear 8. When the left gear of the double gear 9 meshes with the first output gear 7, a constant speed output is achieved. When the right gear of the double gear 9 meshes with the second output gear 8, a low speed output is achieved.

[0021] The housing 1 is equipped with a gear shifting mechanism, which enables the double gear 9 to mesh with the first output gear 7 or the second output gear 8 for transmission.

[0022] Specifically, see Figure 3 As shown, the shifting mechanism includes a rotating shaft 10, a swing arm 11, a swing rod 12, a shift fork 13, and a cylinder 17. The rotating shaft 10 is rotatably mounted on the housing 1. The outer end of the rotating shaft 10 is located outside the housing 1 and is fixedly connected to the swing arm 11. The inner end of the rotating shaft 10 is located inside the housing 1 and is fixedly connected to the lower end of the swing rod 12. A cylinder seat 18 is fixed on the outer wall of the housing 1. The mounting end of the cylinder 17 is hinged to the cylinder seat 18. The piston rod of the cylinder 17 is hinged to the end of the swing arm 11.

[0023] The shift fork 13 is rotatably mounted on the upper end of the rocker arm 12. The shift fork 13 has a groove-shaped structure with its opening facing the double gear 9. Rollers 19 are rotatably mounted on the front surfaces of both sides of the shift fork 13. The outer circumferential surface of the rollers 19 protrudes from the inner side of the shift fork 13 and is in clearance fit with the two sides of the left gear of the double gear 9. Thus, when shifting gears, the two rollers 19 clamp the left gear of the double gear 9 for displacement, and the inner side of the shift fork 13 does not contact the outer side of the left gear of the double gear 9, changing static friction into dynamic friction, which helps to extend the service life of the shift fork 13 and the double gear 9.

[0024] Figure 2 The diagram shows the left gear of the double gear 9 engaged with the first output gear 7. When a gear shift is needed, the piston rod of cylinder 17 extends and presses down on the rocker arm 11. The rocker arm 11 drives the rotating shaft 10 to rotate counterclockwise, and the rotating shaft 10 simultaneously drives the rocker arm 12 to swing counterclockwise. The rocker arm 12 drives the shift fork 13 to move to the left. Through the clamping action of the two rollers 19 on the shift fork 13, the double gear 9 is pushed to the left, so that the right gear of the double gear 9 engages with the second output gear 8, completing the gear shift operation. When the piston rod of cylinder 17 retracts, the gear shift returns to the state where the left gear of the double gear 9 is engaged with the first output gear 7.

[0025] To facilitate real-time control of cylinder 17 when shifting gears, a first proximity switch 20 and a second proximity switch 21 are installed on the outer wall of the housing 1. When the double gear 9 meshes with the first output gear 7, the first proximity switch 20 is aligned with the bottom of the swing arm 11, and the signal from the first proximity switch 20 controls cylinder 17 to stop. When the double gear 9 meshes with the second output gear 8, the second proximity switch 21 is aligned with the bottom of the swing arm 11, and the signal from the second proximity switch 21 controls cylinder 17 to stop.

[0026] To prevent the double gear from continuing to move on the spline of the transition shaft 3 after the gear shift is completed, causing dimensional misalignment, a right-angle seat 22 is fixed on the outer wall of the housing 1. A limit rod 23 is fixed on the right-angle seat 22 to hold the swing arm 11 against the swing arm 11 when it swings down to the limit position.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A two-speed gearbox for a scraping and tumbling machine, comprising a housing (1), wherein a power input shaft (2), a transition shaft (3) parallel to the power input shaft (2), and a power output shaft (4) parallel to the transition shaft (3) are rotatably mounted inside the housing (1), characterized in that: The power input shaft (2) is equipped with a drive gear (5), the transition shaft (3) is equipped with a driven gear (6) that meshes with the drive gear (5), the power output shaft (4) is equipped with a first output gear (7) and a second output gear (8) in sequence, and a double gear (9) is slidably provided on the transition shaft (3). The gearbox (1) is equipped with a gear shifting mechanism, which includes a rotating shaft (10). The outer end of the rotating shaft (10) located outside the gearbox (1) is fixedly connected to a swing arm (11), and the inner end of the rotating shaft (10) located inside the gearbox (1) is fixedly connected to a swing rod (12). The upper end of the swing rod (12) is rotatably provided with a shift fork (13). The shift fork (13) is engaged on the side of the double gear (9) and pushes the double gear (9) to mesh with the first output gear (7) or the second output gear (8) for transmission.

2. The two-speed gearbox of the skiving-rolling machine according to claim 1, characterized in that: The upper end face of the housing (1) is fixed with a motor base (14), and a drive motor (15) is installed on the motor base (14). The drive motor (15) is connected to the power input shaft (2) through belt drive (16).

3. The two-speed gearbox of the skiving-rolling machine according to claim 1, characterized in that: The shifting mechanism includes a cylinder (17) mounted on the outer wall of the housing (1), a cylinder seat (18) fixed on the outer wall of the housing (1), the mounting end of the cylinder (17) being hinged to the cylinder seat (18), and the piston rod of the cylinder (17) being hinged to the end of the swing arm (11).

4. The two-speed gearbox of the skiving-rolling machine according to claim 3, characterized in that: The shift fork (13) is a slotted structure with its opening facing the double gear (9). Rollers (19) are rotatably provided on the front surfaces of both sides of the shift fork (13). The outer circumferential surface of the rollers (19) protrudes from the inner side of the shift fork (13) and is in clearance fit with the two sides of the double gear (9).

5. The two-speed gearbox of the skiving-rolling machine according to claim 1, characterized in that: The outer wall of the housing (1) is equipped with a first proximity switch (20) and a second proximity switch (21). When the double gear (9) meshes with the first output gear (7), the first proximity switch (20) is aligned with the bottom of the swing arm (11). When the double gear (9) meshes with the second output gear (8), the second proximity switch (21) is aligned with the bottom of the swing arm (11).

6. The two-speed gearbox of a skiving-rolling machine according to claim 5, characterized in that: A right-angle seat (22) is fixed on the outer wall of the box (1), and a limiting rod (23) is fixed on the right-angle seat (22) to hold the swing arm (11) against the swing arm (11) when it swings down to the limit position.

Images