A deburring device for the inner hole of the input shaft of an automobile gearbox

Abstract

The present invention discloses a deburring device for the inner hole of an automobile gearbox input shaft, and relates to the technical field of deburring devices for the inner hole of shaft workpieces. The device comprises: a fixed table; a moving block, slidably connected to the upper side of the fixed table; a positioning block, installed on the upper side of the fixed table; a fixed shell, rotatably connected to the moving block, the fixed shell is detachably connected with a grinding brush for driving the grinding brush to move; a protective shell, threadedly connected to the outer side of the fixed shell, and a moving ring is fixedly connected to the inside of the protective shell. The present invention changes the opening range of the grinding brush by changing the position of the protective shell, and reduces the opening amplitude of the grinding brush when the rotation speed of the fixed shell remains unchanged. Under the premise of ensuring the grinding efficiency, the opened grinding brush is prevented from being excessively squeezed by the inner hole of the input shaft, which causes the grinding brush to remove too much surface layer when grinding the inner hole of the small-diameter input shaft, resulting in a deviation between the inner hole size and the required size, thereby affecting the normal use of the input shaft.

Description

Technical Field

[0001] The invention relates to the technical field of devices for removing burrs from inner holes of shaft workpieces, in particular to a device for removing burrs from inner holes of an input shaft of an automobile gearbox. Background Art

[0002] After the processing of the automobile gearbox input shaft is completed, in order to facilitate the assembly and disassembly of tools in the subsequent maintenance process, it is usually necessary to process inner holes at both ends of the input shaft. After the inner hole processing is completed, there will be some burrs on the wall of the inner hole. The appearance of burrs will have a negative impact on the surface quality of the inner hole wall. Therefore, after the inner hole is drilled, the inner hole wall needs to be deburred.

[0003] At present, a motor is usually used to drive a ceramic grinding brush to rotate, so that the bristles of the grinding brush are spread circumferentially under the action of centrifugal force, and then contact the wall of the input shaft inner hole to grind the burrs remaining on the wall. However, in actual use, the same grinding brush is suitable for the input shaft inner hole with an aperture within a certain range. When the same grinding brush is used to grind the small-diameter inner hole on the input shaft, if the rotation speed of the motor output shaft is not changed, the deformed grinding brush will be excessively squeezed by the wall of the input shaft inner hole, thereby increasing the cutting force on the workpiece surface, causing the grinding brush to remove too much surface layer on the input shaft inner hole, resulting in a deviation between the input shaft inner hole size and the required size, thereby affecting the normal use of the input shaft; if the rotation speed of the motor output shaft is reduced, the centrifugal force on the grinding brush will decrease, thereby resulting in a decrease in the efficiency of the grinding brush in cleaning burrs on the input shaft inner hole, which will also affect the normal use of the input shaft. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art mentioned in the above background technology, the present invention provides a deburring device for the inner hole of the input shaft of an automobile gearbox.

[0005] The technical implementation scheme of the present invention is: a deburring device for the inner hole of an automobile gearbox input shaft, comprising:

[0006] Fixed table;

[0007] A moving block is slidably connected to the upper side of the fixed platform;

[0008] A positioning block, mounted on the upper side of the fixing platform;

[0009] A fixed shell is rotatably connected to the moving block, and the fixed shell is detachably connected to a grinding brush for driving the grinding brush to move;

[0010] The protective shell is threadedly connected to the outer side of the fixed shell, a movable ring is fixedly connected to the interior of the protective shell, the grinding brush passes through the movable ring and is slidably connected to the movable ring, the movable ring is used to limit the maximum swing amplitude of the grinding brush, and the protective shell passes through the positioning block and is slidably and rotatably connected to the positioning block.

[0011] Furthermore, the maximum moving distance of the protective shell relative to the fixed shell is the same as the length of the bristles on the grinding brush, ensuring that the protective shell can completely cover the grinding brush.

[0012] Furthermore, the position where the movable ring contacts the grinding brush is arranged in an arc shape, so as to reduce the extrusion force on the grinding brush after being bent.

[0013] Furthermore, it also includes:

[0014] A connecting pipe, slidably connected to the interior of the fixed shell;

[0015] A moving rod, slidably connected to the interior of the connecting pipe;

[0016] An extrusion block is fixedly connected to the moving rod, a deformation layer is arranged on a side of the extrusion block close to the grinding brush, the deformation layer on the extrusion block is extruded and matched with the grinding brush, and the deformation layer is used to reduce the centrifugal force required for the circumferential opening of the grinding brush;

[0017] The movable plate is fixedly connected to the connecting tube, the movable rod passes through the movable plate and is slidably connected thereto, the movable plate is fixedly connected to the deformation layer on the extrusion block, and the relative movement of the movable plate and the extrusion block is used to change the stretching length of the deformation layer.

[0018] Furthermore, it also includes:

[0019] A driving shell is arranged on the fixed shell, and a connecting block fixed to the moving rod is fixed inside the driving shell, the connecting pipe is provided with a sliding groove slidably matched with the connecting block on the moving rod, and the driving shell is slidably matched with the connecting pipe;

[0020] A positioning plate, fixedly connected to the connecting pipe;

[0021] The driving rod is rotatably connected to the positioning plate, and the driving rod is threadably connected to the driving shell.

[0022] Furthermore, the diameter of the extrusion block is larger than the diameter of the circle where the grinding brush is located, and the diameter of the movable plate is smaller than the diameter of the circle where the grinding brush is located, so that the extrusion block, the movable plate and the deformation layer cooperate with each other to form a truncated cone.

[0023] Furthermore, the length of the external thread on the driving rod is not greater than the length of the projection of the deformation layer on the extrusion block on the horizontal plane after reaching the maximum deformation, so as to prevent the deformation layer on the extrusion block from being overstretched and damaged.

[0024] Furthermore, it also includes:

[0025] A limiting ring is fixedly connected to a side of the positioning block away from the moving block through a connecting piece. The limiting ring is slidingly matched with the protective shell. The limiting ring is extrusion-matched with the grinding brush. The limiting ring is used to limit the unfolded shape of the grinding brush.

[0026] Furthermore, an arc portion is provided inside the limiting ring, and the radius of the circle where the arc line of the cross-section of the arc portion of the limiting ring lies is the same as the thickness of the limiting ring, so as to reduce the extrusion force on the grinding brush after deformation.

[0027] Furthermore, the inner diameter of the limiting ring is larger than the outer diameter of the protective shell, and the inner diameter of the limiting ring is larger than the diameter of the extrusion block.

[0028] Compared with the prior art, the present invention has at least the following types of beneficial effects: the present invention changes the opening range of the grinding brush by changing the position of the protective shell, reduces the opening amplitude of the grinding brush when the rotation speed of the fixed shell remains unchanged, and, under the premise of ensuring the grinding efficiency, avoids the excessive squeezing of the opened grinding brush by the inner hole of the input shaft, which causes the grinding brush to remove too much surface layer when grinding the inner hole of the small-diameter input shaft, resulting in a deviation between the inner hole size and the required size, thereby affecting the normal use of the input shaft.

[0029] The grinding brush is squeezed by the squeezing block, so that the bristles on the grinding brush are expanded circumferentially due to the squeezing force, thereby reducing the centrifugal force required for the expansion of the bristles on the grinding brush, increasing the force when the bristles contact the wall of the inner hole of the input shaft, and improving the grinding efficiency of the burrs on the wall of the inner hole of the input shaft.

[0030] The reducing part of the grinding brush is squeezed by the limiting ring so that the reducing part of the grinding brush gathers inward, reducing the expansion range of the grinding brush, ensuring an effective contact area between the grinding brush and the inner hole of the input shaft, and ensuring the grinding effect of the grinding brush on the inner hole of the input shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the moving block and the positioning block of the present invention;

[0033] Figure 3 It is a schematic diagram of the three-dimensional structure of the fixed shell and the grinding brush of the present invention;

[0034] Figure 4 It is a schematic diagram of the three-dimensional structure of the protective shell and the movable ring of the present invention;

[0035] Figure 5 It is a three-dimensional structural schematic diagram of the fixed shell and the connecting pipe of the present invention;

[0036] Figure 6 It is a three-dimensional structural cross-sectional view of the drive housing and the positioning plate of the present invention;

[0037] Figure 7 It is a three-dimensional structural cross-sectional view of the extrusion block and the movable plate of the present invention;

[0038] Figure 8 It is an exploded view of the three-dimensional structure of the connecting pipe and the moving rod of the present invention.

[0039] Figure numbers: 1: fixed table, 2: moving block, 3: positioning block, 4: fixed shell, 5: grinding brush, 6: protective shell, 7: moving ring, 8: connecting pipe, 9: moving rod, 10: extrusion block, 11: moving plate, 12: driving shell, 13: positioning plate, 14: driving rod, 15: limiting ring. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-Figure 7 As shown, the present invention proposes a deburring device for the inner hole of an automobile gearbox input shaft, which is used for removing burrs on the inner hole wall of the input shaft, and includes a fixed platform 1; a moving block 2, which is slidably connected to the upper side of the fixed platform 1; a positioning block 3, which is installed on the upper side of the fixed platform 1; a fixed shell 4, which is rotatably connected to the moving block 2, and the fixed shell 4 is detachably connected with a grinding brush 5, which is used to drive the grinding brush 5 to move; a protective shell 6, which is threadedly connected to the outer side of the fixed shell 4, and the interior of the protective shell 6 is fixedly connected with a moving ring 7, the grinding brush 5 passes through the moving ring 7 and is slidably connected thereto, the moving ring 7 is used to limit the maximum swing amplitude of the grinding brush 5, and the protective shell 6 passes through the positioning block 3 and is slidably and rotatably connected thereto.

[0042] In the above scheme, the purpose is to solve the shortcomings of the prior art in removing burrs on the inner hole wall of the input shaft. The inner hole deburring device of the automobile gearbox input shaft in this embodiment includes a fixed platform 1, which is used to support the entire device. The moving block 2 is located on the left side of the fixed platform 1. The fixed platform 1 is provided with a moving module inside, which is used to drive the moving block 2 to move left and right. In the figure, the moving module is selected as a combination of a threaded rod, a pulley belt and a first motor. The output shaft of the first motor and the threaded rod are driven by a pulley belt. The first motor is installed on the fixed platform 1. The threaded rod is rotatably connected to the fixed platform 1. The moving block 2 is fixed with a connecting block that is threaded with the threaded rod. The positioning block 3 is located on the right side of the moving block 2. The moving block 2 is provided with a driving module for driving the fixed shell 4 to rotate. The driving module is selected as a combination of a second motor and a pulley belt in the figure. The second motor is installed on the moving block 2. The output shaft of the motor and the fixed shell 4 are driven by a pulley belt. The grinding brush 5 is provided with a plurality of groups of bristles evenly distributed in the circumferential direction. The specific number of bristles can be specifically selected by the staff. The middle section of the interior of the protective shell 6 is provided with an internal thread, and the right part of the outer side of the fixed shell 4 is provided with an external thread. The length of the internal thread on the protective shell 6 is less than the length of the external thread on the fixed shell 4, and in the initial position, the internal thread on the protective shell 6 is located at the rightmost side of the external thread of the fixed shell 4. The movable ring 7 is located at the rightmost end of the protective shell 6, and the movable ring 7 is provided with circumferentially uniformly distributed through holes, wherein the specific number of circumferentially uniformly distributed through holes is the same as the number of groups of bristles of the grinding brush 5, and each group of bristles passes through adjacent through holes on the movable ring 7.

[0043] Furthermore, the maximum moving distance of the protective shell 6 relative to the fixed shell 4 is the same as the length of the bristles on the grinding brush 5 , ensuring that the protective shell 6 can completely cover the grinding brush 5 .

[0044] In the above scheme, the purpose is to limit the moving distance of the protective shell 6, that is, to limit the length of the external thread on the fixed shell 4, to ensure that when the protective shell 6 moves to the left to the extreme position, the movable ring 7 can still contact the bristles on the grinding brush 5.

[0045] Furthermore, the position where the movable ring 7 contacts the grinding brush 5 is set to be arc-shaped, so as to reduce the squeezing force on the grinding brush 5 after bending.

[0046] In the above scheme, the specific shape of the movable ring 7 is optimized to prevent the grinding brush 5 from being bent by centrifugal force, causing the grinding brush 5 to be hard squeezed against the movable ring 7, resulting in irreversible deformation of the grinding brush 5 and affecting the subsequent use of the grinding brush 5.

[0047] When using the device to remove burrs in the inner hole of the input shaft, the staff first uses a clamp to fix the input shaft on the upper left side of the fixed platform 1, and then the staff starts the moving module, which drives the moving block 2 to move to the right, and the moving block 2 drives the fixed shell 4 to move to the right synchronously, until the right end of the grinding brush 5 extends into the inner hole of the input shaft, and then the staff temporarily shuts down the moving module.

[0048] After the above-mentioned staff shuts down the moving module, the staff changes the exposed length of the grinding brush 5 according to the diameter of the inner hole of the input shaft, that is, moves the protective shell 6 to the left, changes the relative positions of the protective shell 6 and the moving ring 7 and the fixed shell 4, and in the process of the protective shell 6 driving the moving ring 7 to move to the left, the part of the grinding brush 5 located in the protective shell 6 is gradually exposed, until the protective shell 6 is adjusted according to the diameter of the inner hole of the input shaft, and then the staff stops moving the protective shell 6.

[0049] After the position of the above-mentioned protective shell 6 is adjusted, the staff starts the moving module again, and the moving module drives the moving block 2 to move to the right again. At the same time, the staff starts the driving module, and the driving module drives the fixed shell 4 to rotate, and then drives the grinding brush 5 to rotate synchronously, so that the bristles on the grinding brush 5 are opened circumferentially due to the centrifugal force. Even if the bristles on the grinding brush 5 contact the wall of the inner hole of the input shaft, the grinding brush 5 grinds the surface of the inner hole of the input shaft to remove the burrs in the inner hole of the input shaft (that is, grind a part of the surface of the inner hole of the input shaft to make the surface of the inner hole of the input shaft tend to be smooth).

[0050] In the above-mentioned process of grinding the burrs in the inner hole of the input shaft, the moving module continuously drives the moving block 2 to move left and right to adjust the grinding position of the inner hole of the input shaft, improve the uniformity of the grinding of the inner hole of the input shaft, and further improve the smoothness of the inner hole of the input shaft. At the same time, when the bristles on the above-mentioned grinding brush 5 are circumferentially opened by centrifugal force, the opening range of the grinding brush 5 is limited by the length of the part located on the right side of the moving ring 7, that is, the operation of changing the opening range of the grinding brush 5 can be achieved by changing the position of the protective shell 6. When the rotation speed of the fixed shell 4 remains unchanged, the opening amplitude of the grinding brush 5 is reduced to prevent the grinding brush 5 from grinding a thicker surface layer of the small diameter input shaft inner hole, causing the size of the input shaft inner hole to deviate from the required size, thereby affecting the normal use of the input shaft.

[0051] After the burrs in the inner hole of an input shaft are polished, the staff turns off the driving module and controls the final moving module to reset the fixed shell 4 to the initial position, then removes the polished input shaft and fixes the next input shaft to be polished. Then the staff measures the aperture of the inner hole of the second input shaft. If the aperture is the same as that of the inner hole of the first input shaft, there is no need to adjust the position of the protective shell 6 again. The inner hole of the second input shaft can be polished according to the above operation. If the aperture is different from the aperture of the inner hole of the first input shaft, the staff will adjust the position of the protective shell 6 again according to the above operation.

[0052] Further, such as Figure 4-Figure 8 As shown, it also includes: a connecting tube 8, which is slidably connected to the inside of the fixed shell 4; a moving rod 9, which is slidably connected to the inside of the connecting tube 8; an extrusion block 10, which is fixed to the moving rod 9, and a deformation layer is provided on the side of the extrusion block 10 close to the grinding brush 5, and the deformation layer on the extrusion block 10 is extruded and matched with the grinding brush 5, and the deformation layer is used to reduce the centrifugal force required for the circumferential opening of the grinding brush 5; a moving plate 11, which is fixed to the connecting tube 8, and the moving rod 9 passes through the moving plate 11 and is slidably connected thereto, and the moving plate 11 is fixed to the deformation layer on the extrusion block 10, and the relative movement of the moving plate 11 and the extrusion block 10 is used to change the tensile length of the deformation layer.

[0053] In the above scheme, the problem of the reduction of the force exerted by the grinding brush 5 on the inner hole of the input shaft after the bending length of the grinding brush 5 is changed is solved. The extrusion block 10 is located on the right side of the grinding brush 5, and the deformation layer on the extrusion block 10 is in contact with the right side of the grinding brush 5 in the initial position. In the process of the deformation layer extruding the grinding brush 5, the grinding brush 5 is circumferentially opened by the extrusion force, that is, the centrifugal force required for the circumferential opening of the grinding brush 5 is reduced. By moving the moving plate 11 relative to the extrusion block 10, the deformation layer is deformed by the tensile force generated by the movement of the moving plate 11, providing a more uniform support force for the bristles on the grinding brush 5, and the extrusion block 10 and the moving plate 11 are in contact with each other in the initial state, and the moving plate 11 is located on the left side of the extrusion block 10, ensuring that the inclined surface of the deformation layer after being stretched is located on the right side of the grinding brush 5.

[0054] like Figure 3-Figure 6 As shown, it also includes: a driving shell 12, which is arranged on the fixed shell 4, and the interior of the driving shell 12 is fixedly connected with a connecting block fixed to the moving rod 9, the connecting tube 8 is provided with a sliding groove that slides with the connecting block on the moving rod 9, and the driving shell 12 slides with the connecting tube 8; a positioning plate 13, which is fixed to the connecting tube 8; a driving rod 14, which is rotatably connected to the positioning plate 13, and the driving rod 14 is threadedly connected to the driving shell 12.

[0055] In the above scheme, the right side of the driving shell 12 is provided with an external thread, and the left side of the fixed shell 4 is provided with an internal thread. The external thread of the driving shell 12 is threadedly matched with the internal thread of the fixed shell 4. The driving shell 12 can be moved left and right by rotating the driving shell 12 in a circumferential direction. The driving rod 14 is located on the upper side of the positioning plate 13. The driving rod 14 is provided with an external thread. The upper side of the driving shell 12 is provided with an internal thread. The internal thread of the driving shell 12 is threadedly matched with the external thread of the driving rod 14. The driving rod 14 can be moved left and right by rotating the driving rod 14 in a circumferential direction.

[0056] Furthermore, the diameter of the extrusion block 10 is larger than the diameter of the circle where the grinding brush 5 is located, and the diameter of the movable plate 11 is smaller than the diameter of the circle where the grinding brush 5 is located, so that the extrusion block 10, the movable plate 11 and the deformation layer cooperate with each other to form a truncated cone.

[0057] In the above scheme, the diameters of the extrusion block 10 and the movable plate 11 are limited to ensure that the deformation layer of the extrusion block 10 can present a truncated cone shape after being stretched, while ensuring that the small diameter of the truncated cone surface is located inside the grinding brush 5, providing more uniform support force for the bristles on the grinding brush 5.

[0058] Furthermore, the length of the external thread on the driving rod 14 is not greater than the length of the projection of the deformation layer on the extrusion block 10 on the horizontal plane after reaching the maximum deformation, so as to prevent the deformation layer on the extrusion block 10 from being overstretched and damaged.

[0059] In the above scheme, the moving distance of the driving rod 14 is limited so that after the driving rod 14 moves to the left to the extreme position, the deformation layer on the extrusion block 10 is not in the maximum deformation state, thereby preventing the deformation layer on the extrusion block 10 from being subjected to excessive pulling force and causing plastic deformation, causing the deformation layer to be unable to return to its initial state.

[0060] After the position of the protective shell 6 is adjusted, the deformable length of the grinding brush 5 decreases, thereby reducing the impact force generated by the right end of the grinding brush 5 on the inner hole of the input shaft during the rotation process, which affects the grinding effect of the inner hole of the input shaft. The present invention solves the above problem through the following measures:

[0061] The staff rotates the driving shell 12 to move the driving shell 12 to the left, and at the same time, the driving shell 12 drives the moving rod 9 to move to the left synchronously, and the moving rod 9 drives the extrusion block 10 to move to the left synchronously, and the extrusion block 10 squeezes the moving plate 11 and the connecting tube 8, so that the moving plate 11 and the connecting tube 8 move to the left synchronously with the driving shell 12, and at the same time, the driving shell 12 drives the positioning plate 13 and the driving rod 14 to move to the left synchronously.

[0062] During the process of the extrusion block 10 moving to the left, when the deformation layer on the extrusion block 10 moves to contact the right end of the grinding brush 5, the deformation layer of the extrusion block 10 continues to move, and the right end of the grinding brush 5 is squeezed by the deformation layer, so that the bristles on the grinding brush 5 are expanded circumferentially due to the extrusion force, and the position of the right end of the bristles is changed, thereby reducing the centrifugal force required for the expansion of the bristles on the grinding brush 5, increasing the force when the bristles contact the wall of the inner hole of the input shaft, and improving the efficiency of grinding the burrs on the wall of the inner hole of the input shaft, avoiding that the centrifugal force on the bristles decreases synchronously after the deformable length of the bristles becomes shorter, thereby reducing the grinding effect on the wall of the inner hole of the input shaft.

[0063] After the position of the extrusion block 10 is adjusted according to the diameter of the inner hole of the shaft, the staff stops rotating the drive shell 12, and then rotates the drive rod 14, so that the drive rod 14 drives the positioning plate 13 to move left again, and the positioning plate 13 drives the connecting tube 8 to continue to move left, and the connecting tube 8 drives the movable plate 11 to continue to move left, so that the movable plate 11 moves left relative to the extrusion block 10, and then the deformation layer on the extrusion block 10 is stretched, so that the deformation layer presents a frustum shape between the extrusion block 10 and the movable plate 11, thereby providing more uniform support force for the bristles on the grinding brush 5 at the deformed position, avoiding the bristles from being squeezed by the extrusion block 10 and the movable ring 7 to produce irreversible deformation, which affects the subsequent use of the grinding brush 5.

[0064] After the first input shaft is polished, the staff resets the fixed housing 4, the driving housing 12 and other parts to their initial positions, and polishes the next input shaft according to the above operation.

[0065] like Figure 2 and Figure 3 As shown, it also includes: a limit ring 15, which is fixed to the side of the positioning block 3 away from the moving block 2 through a connecting piece, the limit ring 15 is slidably matched with the protective shell 6, and the limit ring 15 is extrusion-matched with the grinding brush 5. The limit ring 15 is used to limit the unfolded shape of the grinding brush 5.

[0066] In the above scheme, the purpose is to intercept and limit the grinding brush 5 located outside the protective shell 6 and outside the inner hole of the input shaft, and the limit ring 15 limits the maximum opening range of this part of the grinding brush to prevent the bristles of the grinding brush 5 from being subjected to the combined action of centrifugal force and the extrusion force of the left side of the input shaft at the position where the bristles of the grinding brush 5 contact the input shaft, causing the bristles of the grinding brush 5 located on the left side of the input shaft to bend in the opposite direction, resulting in the opening diameter of the bristles of the grinding brush 5 located on the left side of the input shaft being larger than the aperture of the inner hole of the input shaft, resulting in the grinding brush 5 being unable to enter the inner hole of the input shaft, thereby affecting the grinding effect of the burrs in the inner hole of the input shaft.

[0067] Furthermore, an arc portion is provided inside the limiting ring 15 , and the radius of the circle where the arc line of the cross-section of the arc portion of the limiting ring 15 lies is the same as the thickness of the limiting ring 15 , so as to reduce the extrusion force on the grinding brush 5 after deformation.

[0068] In the above scheme, the shape of the limiting ring 15 is optimized to avoid the grinding brush 5 and the limiting ring 15 being rigidly squeezed after the limiting ring 15 contacts the grinding brush 5, thereby causing the grinding brush 5 to produce irreversible deformation and affecting the subsequent use of the grinding brush 5.

[0069] Furthermore, the inner diameter of the limiting ring 15 is larger than the outer diameter of the protective shell 6 , and the inner diameter of the limiting ring 15 is larger than the diameter of the extrusion block 10 , so as to ensure smooth movement of the protective shell 6 and the extrusion block 10 .

[0070] In the above scheme, the inner diameter of the limit ring 15, the outer diameter of the protective shell 6 and the diameter of the extrusion block 10 are limited to prevent the limit ring 15 from colliding with the protective shell 6 and the extrusion block 10 when the fixed shell 4 moves left and right, causing the above parts to be deformed by the impact and affecting the normal use of the above parts.

[0071] In the above process of fixing the input shaft, the staff needs to adjust the distance between the left side of the input shaft and the limit ring 15 to a suitable distance according to the aperture of the inner hole of the input shaft, and then the staff grinds the inner hole of the input shaft according to the above operation. In the process of grinding the inner hole of the input shaft, the rotating grinding brush 5 presents a funnel shape (the large diameter of the funnel contacts the hole wall of the inner hole of the input shaft).

[0072] As the grinding position is constantly changed, the contact position between the grinding brush 5 and the inner hole of the input shaft is also constantly changed. When the diameter change portion of the funnel formed by the grinding brush 5 contacts the inner side of the limiting ring 15 (the diameter change portion has moved to the outside of the inner hole of the input shaft), as the grinding brush 5 continues to move to the left, the diameter change portion of the grinding brush 5 is squeezed by the limiting ring 15, so that the diameter change portion of the grinding brush 5 gathers inward, thereby reducing the expansion amplitude of the grinding brush 5 and the contact range of the grinding brush 5 and the inner hole of the input shaft, thereby avoiding the diameter change portion of the grinding brush 5 moving to the input shaft. When the inner hole is outside, the grinding brush 5 between the protective shell 6 and the input shaft is subjected to the dual effects of centrifugal force and the pressure on the left side of the inner hole of the input shaft, so that the bristles of the grinding brush 5 located on the left side of the input shaft are bent in the opposite direction, thereby reducing the contact area between the grinding brush 5 and the inner hole of the input shaft, reducing the grinding effect of the grinding brush 5 on the inner hole of the input shaft, and at the same time avoiding the opening diameter of the bristles of the grinding brush 5 located on the left side of the input shaft being larger than the aperture of the inner hole of the input shaft, resulting in the grinding brush 5 being unable to enter the inner hole of the input shaft, so that the grinding efficiency of the grinding brush 5 on the input shaft is affected.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A deburring device for the inner hole of an automobile gearbox input shaft, characterized in that: include: Fixed table (1); A moving block (2) slidably connected to the upper side of the fixed platform (1); A positioning block (3) mounted on the upper side of the fixing platform (1); A fixed shell (4) is rotatably connected to the moving block (2); the fixed shell (4) is detachably connected to a grinding brush (5) and is used to drive the grinding brush (5) to move; A protective shell (6) is threadedly connected to the outer side of the fixed shell (4); a movable ring (7) is fixedly connected to the interior of the protective shell (6); the grinding brush (5) passes through the movable ring (7) and is slidably connected thereto; the movable ring (7) is used to limit the maximum swing amplitude of the grinding brush (5); the protective shell (6) passes through the positioning block (3) and is slidably and rotatably connected thereto; Also includes: A connecting pipe (8) slidably connected to the interior of the fixed shell (4); A moving rod (9) slidably connected to the interior of the connecting pipe (8); An extrusion block (10) is fixedly connected to the moving rod (9), a deformation layer being arranged on a side of the extrusion block (10) close to the grinding brush (5), the deformation layer on the extrusion block (10) being extruded and matched with the grinding brush (5), the deformation layer being used to reduce the centrifugal force required for the circumferential opening of the grinding brush (5); A movable plate (11) is fixedly connected to the connecting tube (8); the movable rod (9) passes through the movable plate (11) and is slidably connected thereto; the movable plate (11) is fixedly connected to the deformation layer on the extrusion block (10); and the relative movement of the movable plate (11) and the extrusion block (10) is used to change the stretching length of the deformation layer; The diameter of the extrusion block (10) is greater than the diameter of the circle where the grinding brush (5) is located, and the diameter of the movable plate (11) is smaller than the diameter of the circle where the grinding brush (5) is located, so that the extrusion block (10), the movable plate (11) and the deformation layer cooperate with each other to form a truncated cone.

2. A deburring device for the inner hole of an automobile transmission input shaft according to claim 1, characterized in that: The maximum moving distance of the protective shell (6) relative to the fixed shell (4) is the same as the length of the bristles on the grinding brush (5), ensuring that the protective shell (6) can completely cover the grinding brush (5).

3. A deburring device for the inner hole of an automobile transmission input shaft according to claim 2, characterized in that: The position where the movable ring (7) contacts the grinding brush (5) is arranged in an arc shape, so as to reduce the squeezing force exerted on the grinding brush (5) after being bent.

4. A deburring device for the inner hole of an input shaft of an automobile transmission as claimed in claim 1, characterized in that: include: A drive housing (12) is arranged on the fixed housing (4), and a connecting block fixed to the moving rod (9) is fixedly connected inside the drive housing (12), the connecting pipe (8) is provided with a sliding groove slidably matched with the connecting block on the moving rod (9), and the drive housing (12) and the connecting pipe (8) are slidably matched; A positioning plate (13) fixedly connected to the connecting pipe (8); A driving rod (14) is rotatably connected to the positioning plate (13), and the driving rod (14) is threadedly connected to the driving housing (12).

5. A deburring device for the inner hole of an automobile transmission input shaft according to claim 4, characterized in that: The length of the external thread on the driving rod (14) is no greater than the length of the projection of the deformation layer on the extrusion block (10) on the horizontal plane after reaching the maximum deformation, so as to prevent the deformation layer on the extrusion block (10) from being overstretched and damaged.

6. A deburring device for the inner hole of an input shaft of an automobile transmission as claimed in claim 5, characterized in that: include: A limit ring (15) is fixedly connected to a side of the positioning block (3) away from the moving block (2) via a connecting piece, the limit ring (15) is slidably matched with the protective shell (6), the limit ring (15) is pressedly matched with the grinding brush (5), and the limit ring (15) is used to limit the unfolded shape of the grinding brush (5).

7. A deburring device for the inner hole of an automobile transmission input shaft according to claim 6, characterized in that: An arc portion is provided inside the limiting ring (15), and the radius of the circle where the arc line of the cross section of the arc portion of the limiting ring (15) lies is the same as the thickness of the limiting ring (15), so as to reduce the extrusion force exerted on the grinding brush (5) after deformation.

8. A deburring device for the inner hole of an automobile transmission input shaft according to claim 7, characterized in that: The inner diameter of the limiting ring (15) is greater than the outer diameter of the protective shell (6), and the inner diameter of the limiting ring (15) is greater than the diameter of the extrusion block (10).

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