A hobbing fixture for a differential gear ring of a tractor

Abstract

This utility model belongs to the field of gear processing technology, and in particular, a hobbing fixture for a differential gear ring of a tractor vehicle. It includes a base, on which a conical seat is provided. A positioning plate and a guide ring are fitted on the outer side of the conical seat. The guide ring is located above the positioning plate. The diameter of the top of the conical seat is smaller than that of the middle part, forming a frustum-shaped structure. A pressure block is provided at the top of the conical seat. A first through hole is opened in the middle of the base, a second through hole is opened in the middle of the frustum, and a third through hole is opened in the middle of the pressure block. The first, second, and third through holes are connected. A pull rod is provided in the third through hole of the pressure block. An annular connecting plate is provided on the top edge of the pull rod and is connected to the pressure block. The bottom of the pull rod is located in the second through hole. A double-ended screw is connected to the bottom end of the pull rod. Multiple arc tiles are evenly distributed on the lower surface of the pressure block. The multiple arc tiles are distributed in a ring. The inner sidewall of the arc tiles is an inclined surface that matches the top sidewall of the conical seat. The arc tiles are slidably arranged radially.

Description

Technical Field

[0001] This utility model relates to the field of gear processing technology, and in particular to a gear hobbing fixture for a tractor differential gear ring. Background Technology

[0002] The gears in the differential gears of tractor vehicles are relatively large in diameter and heavy, with a diameter of 430mm and a weight of up to 40kg. During gear hobbing, adhesive expansion sleeves are typically used to clamp and position the inner wall of the gear. However, in actual production, due to the large size and weight of the gears, and the fact that the diameter of the adhesive expansion sleeve is slightly smaller than the inner diameter of the gear (otherwise, the sleeve cannot securely hold the gear, affecting the hobbing accuracy), placing the gear on the sleeve is difficult and requires very precise alignment. In actual production, the gears need to be lifted by a crane and placed on the sleeve, making precise alignment impossible. The placement process can cause impacts to the sleeve, damaging it. Adhesive expansion sleeves typically cost around 40,000 yuan each, and only about 50 gears produced with a single sleeve become unusable due to severe damage. This results in high production costs for tractor differential gears, a heavy workload for workers, and low production efficiency.

[0003] To address the aforementioned problems, this utility model document proposes a gear hobbing fixture for a tractor differential gear ring. Utility Model Content

[0004] This utility model provides a gear hobbing fixture for the differential gear ring of a tractor, which facilitates gear clamping, reduces enterprise production costs, and improves worker efficiency.

[0005] This utility model provides the following technical solution:

[0006] A hobbing fixture for a differential gear ring of a tractor includes a base, on which a conical seat is provided. A positioning plate and a guide ring are fitted on the outer side of the conical seat, with the guide ring located above the positioning plate. The diameter of the top of the conical seat is smaller than that of the middle part, forming a frustum-shaped structure. A pressure block is provided at the top of the conical seat. A first through hole is opened in the middle of the base, a second through hole is opened in the middle of the frustum, and a third through hole is opened in the middle of the pressure block. The first, second, and third through holes are connected. A pull rod is provided in the third through hole of the pressure block. An annular connecting plate is provided on the top edge of the pull rod, and the annular connecting plate is connected to the pressure block. The bottom of the pull rod is located in the second through hole, and a double-ended screw is connected to the bottom end of the pull rod. Multiple arc-shaped tiles are evenly distributed on the lower surface of the pressure block in a ring shape. The inner sidewall of the arc-shaped tiles is an inclined surface that matches the top sidewall of the conical seat. The arc-shaped tiles are slidably arranged radially.

[0007] Furthermore, the center lines of the first through hole, the second through hole, and the third through hole are coaxially arranged.

[0008] Furthermore, the double-ended screw is a telescopic double-ended screw, the middle of the pull rod has a fourth through hole, the bottom side wall of the pull rod has a first positioning hole, and a locking bolt is provided in the first positioning hole. The double-ended screw is fixed in the pull rod by the locking bolt.

[0009] Furthermore, the side wall of the end where the double-ended screw connects to the pull rod has a guide groove along the height direction, and the side wall at the bottom of the fourth through hole is provided with a guide block that cooperates with the guide groove.

[0010] Furthermore, the top of the arc-shaped tile has a second positioning hole, and the pressure block has an installation hole. The arc-shaped tile and the pressure block are connected by a bolt through the positioning hole and the installation hole. A sliding cylinder is provided in the installation hole. The sliding cylinder is sleeved on the connecting bolt. The diameter of the sliding cylinder is smaller than the diameter of the installation hole. A washer is also sleeved on the connecting bolt. The washer is located at the top of the sliding cylinder, and the diameter of the washer is larger than the diameter of the installation hole.

[0011] Furthermore, the pressure block is provided with an anti-rotation hole, and a third positioning hole is provided at the corresponding position on the top surface of the cone seat. An anti-rotation bolt is provided in the anti-rotation hole, and one end of the anti-rotation bolt is located in the third positioning hole; the upper and lower edges of the pressure block are rounded.

[0012] Furthermore, the outer edge of the truncated cone is provided with an annular groove, and the positioning disk and guide ring are disposed in the annular groove.

[0013] Furthermore, the cone seat is connected to the base via countersunk bolts, the positioning plate is connected to the cone seat via countersunk bolts, and the guide ring is connected to the positioning plate via countersunk bolts.

[0014] Furthermore, the upper surface of the base is provided with a locking hole in the middle, and the bottom surface of the cone seat is provided with an annular locking block that cooperates with the locking hole. The inner wall of the annular locking block is flush with the inner wall of the second through hole.

[0015] Furthermore, the side wall of the positioning plate is provided with a fourth positioning hole for installing lifting bolts.

[0016] In this invention, the gear is pre-positioned by a guide ring, and the pressure block is moved downward by a pull rod. This causes the arc-shaped tile on the lower surface of the pressure block to move along the side wall of the truncated cone and expand radially outward. As a result, the outer wall of the arc-shaped tile abuts against the inner wall of the gear, thus clamping and fixing the gear. The contraction and expansion of the arc-shaped tile is larger than that of the adhesive expansion sleeve, so that the diameter of the ring formed by multiple arc-shaped tiles is smaller than the diameter of the adhesive expansion sleeve. This makes it easier for workers to position the gear and also prevents the gear from damaging the arc-shaped tile, thus reducing the production cost for the enterprise. Attached Figure Description

[0017] Figure 1 A cross-sectional view of a gear hobbing fixture for a tractor differential ring provided in an embodiment of this utility model;

[0018] Figure 2 A cross-sectional view of the center positioning plate of a gear hobbing fixture for a tractor differential ring provided in an embodiment of this utility model.

[0019] Figure 3 A cross-sectional view of the pressure block of a gear hobbing fixture for a tractor differential ring provided in an embodiment of this utility model.

[0020] Figure 4 A schematic diagram of the structure of the middle arc tile of a gear hobbing fixture for a tractor differential ring provided in an embodiment of this utility model;

[0021] Figure 5 This is a cross-sectional view of the tie rod of a gear hobbing fixture for a tractor differential ring provided in an embodiment of the present invention.

[0022] Figure label:

[0023] 1. Base; 101. First through hole; 2. Conical seat; 201. Second through hole; 202. Third positioning hole; 203. Annular groove; 3. Positioning plate; 301. Fourth positioning hole; 4. Guide ring; 5. Pressure block; 501. Mounting hole; 502. Sliding cylinder; 503. Connecting bolt; 504. Washer; 505. Anti-rotation hole; 506. Anti-rotation bolt; 507. Third through hole; 6. Arc tile; 601. Second positioning hole; 7. Double-ended screw; 701. Guide groove; 8. Pull rod; 801. Annular connecting plate; 802. Fourth through hole; 803. First positioning hole; 804. Locking bolt; 805. Guide block. Detailed Implementation

[0024] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0025] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0026] In this embodiment of the invention, the terms "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" and "second" may explicitly or implicitly include one or more of that feature.

[0027] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] Example:

[0030] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a hobbing fixture for a differential gear ring of a tractor includes a base 1, on which a cone seat 2 is provided. A positioning plate 3 and a guide ring 4 are fitted on the outer side of the cone seat 2. The guide ring 4 is located above the positioning plate 3. The diameter of the top of the cone seat 2 is smaller than the diameter of the middle part, forming a frustum-shaped structure. A pressure block 5 is provided at the top of the cone seat 2. A first through hole 101 is opened in the middle of the base 1, a second through hole 201 is opened in the middle of the frustum, and a third through hole 507 is opened in the middle of the pressure block 5. The first through hole 101, the second through hole 201, and the... The third through hole 507 is connected, and a pull rod 8 is provided in the third through hole 507 of the pressure block 5. The top edge of the pull rod 8 is provided with an annular connecting plate 801, which is connected to the pressure block 5. The bottom of the pull rod 8 is located in the second through hole 201, and a double-headed screw 7 is connected to the bottom end of the pull rod 8. Multiple arc tiles 6 are evenly provided on the lower surface of the pressure block 5. The multiple arc tiles 6 are distributed in a ring. The inner side wall of the arc tile 6 is an inclined surface that matches the top side wall of the cone seat 2. The arc tile 6 is slidably arranged radially.

[0031] The arc-shaped tile 6 is installed on the lower surface of the pressure block 5. The top end of the double-ended screw 7 is connected to the pull rod 8. The pull rod 8 is then inserted into the second through hole 201 and the third through hole 507. The annular connecting plate 801 at the top of the pull rod 8 is fixed to the pressure block 5, thus fixing the position of the double-ended screw 7. The base 1 is installed on the workbench of the external working equipment, and the bottom end of the double-ended screw 7 is connected to the power mechanism of the external working equipment. The gear is fitted onto the outside of the guide ring 4 from above, and the gear is supported by the positioning plate 3. 4. The gears are pre-positioned by a power mechanism of an external device that pulls a double-headed screw 7, which in turn pulls a pull rod 8 downwards. The top of the pull rod 8 is connected to a pressure block 5, causing the pressure block 5 to move downwards. The downward movement of the pressure block 5 drives the arc-shaped tile 6 downwards, where it abuts against the top side wall of the cone seat 2. As the arc-shaped tile 6 moves downwards, it expands outwards. When the arc-shaped tile 6 moves to abut against the inner side wall of the gear, it presses and fixes the inner wall of the gear, facilitating gear hobbing and improving worker efficiency. The gear is clamped by the radial movement of multiple arc-shaped tiles 6. The diameter of the annular structure formed by the assembled arc-shaped tiles 6 can be set smaller than the diameter of the previously used adhesive expansion sleeve, making it easier for workers to place the gear. At the same time, the use of arc-shaped tiles 6 eliminates the need for adhesive expansion sleeves, saving on their cost. The cost of arc-shaped tiles 6 is lower, and even if they are damaged by gear collisions, only the damaged arc-shaped tiles 6 need to be replaced, significantly reducing the company's production costs.

[0032] The center lines of the first through hole 101, the second through hole 201, and the third through hole 507 are coaxially arranged.

[0033] The coaxial arrangement ensures the stability of the movement of the pull rod 8 when the external equipment drives it to move, thereby ensuring the stability of the downward movement of the pressure plate. This also ensures that the multiple arc tiles 6 expand outward at the same speed, thus guaranteeing the stability of the arc tiles 6 in positioning the gears.

[0034] The double-ended screw 7 is a telescopic double-ended screw 7. The pull rod 8 has a fourth through hole 802 in the middle. The bottom side wall of the pull rod 8 has a first positioning hole 803. The first positioning hole 803 has a locking bolt 804. The double-ended screw 7 is fixed in the pull rod 8 by the locking bolt 804.

[0035] The locking bolt 804 facilitates the connection between the double-ended screw 7 and the pull rod 8. The double-ended screw 7 is telescopic, which can meet the connection of the power mechanism of different external equipment.

[0036] The side wall of the end where the double-ended screw 7 connects to the tie rod 8 has a guide groove 701 along the height direction, and the side wall at the bottom of the fourth through hole 802 is provided with a guide block 805 that cooperates with the guide groove 701.

[0037] The guide block 805 is locked in the guide groove 701. When the connection position between the double-ended screw 7 and the pull rod 8 is adjusted, the guide block 805 slides in the guide groove 701. When the double-ended screw 7 drives the pull rod 8 to move, the guide groove 701 can also restrict the rotation of the guide block 805 to ensure the stability of the connection between the double-ended screw 7 and the pull rod 8.

[0038] The top of the arc-shaped tile 6 has a second positioning hole 601, and the pressure block 5 has an installation hole 501. The arc-shaped tile 6 and the pressure block 5 are connected by a bolt 503 through the positioning hole and the installation hole 501. A sliding cylinder 502 is provided in the installation hole 501. The sliding cylinder 502 is sleeved on the connecting bolt 503. The diameter of the sliding cylinder 502 is smaller than the diameter of the installation hole 501. A washer 504 is also sleeved on the connecting bolt 503. The washer 504 is located at the top of the sliding cylinder 502, and the diameter of the washer 504 is larger than the diameter of the installation hole 501.

[0039] The connecting bolt 503 passes through the mounting hole 501 and connects to the second positioning hole 601. The diameter of the washer 504 is larger than the diameter of the mounting hole 501. The washer 504 prevents the connecting bolt 503 from falling out of the mounting hole 501. The diameter of the sliding cylinder 502 is smaller than the diameter of the mounting hole 501, ensuring that the sliding cylinder 502 can slide in the mounting hole 501. At the same time, the sliding sleeve ensures the stability of the arc tile 6 when moving, and does not damage the connecting bolt 503, thus preventing the arc tile 6 from falling off the pressure block 5.

[0040] The pressure block 5 is provided with an anti-rotation hole 505, and the corresponding position on the top surface of the cone seat 2 is provided with a third positioning hole 202. An anti-rotation bolt 506 is provided in the anti-rotation hole 505, and one end of the anti-rotation bolt 506 is located in the third positioning hole 202.

[0041] By connecting the anti-rotation hole 505 on the pressure block 5 and the third positioning hole 202 on the cone seat 2 with the anti-rotation bolt 506, the pressure block 5 is prevented from rotating during movement, thereby ensuring the stability of the arc tile 6 movement and thus ensuring the positioning effect of the gear.

[0042] The top and bottom edges of the pressure block 5 are rounded.

[0043] By using rounded corners, the impact of the gear on the pressure block 5 during placement is reduced, which helps to correct the placement direction of the gear. At the same time, it reduces the impact damage of the gear on the pressure block 5, improves the stability of the pressure block 5 installation, and thus improves the stability of the arc tile 6 structure.

[0044] An annular groove 203 is provided on the outer edge of the truncated cone, and the positioning plate 3 and guide ring 4 are located in the annular groove 203. The annular groove 203 facilitates the installation of the positioning plate 3 and guide ring 4, and provides support for the positioning plate 3.

[0045] The cone seat 2 is connected to the base 1 by countersunk bolts, the positioning plate 3 is connected to the cone seat 2 by countersunk bolts, and the guide ring 4 is connected to the positioning plate 3 by countersunk bolts.

[0046] The countersunk bolts facilitate clamp installation and prevent mutual interference.

[0047] The upper surface of the base 1 has a locking hole in the middle, and the bottom surface of the cone seat 2 has an annular locking block that matches the locking hole. The inner wall of the annular locking block is flush with the inner wall of the second through hole 201.

[0048] The cone seat 2 is positioned by means of a locking hole and an annular locking block, which facilitates the accurate positioning of the cone seat 2 during installation. The inner wall of the annular locking block is flush with the inner wall of the second through hole 201, so as to avoid affecting the movement of the double-ended screw 7.

[0049] The side wall of the positioning plate 3 is provided with a fourth positioning hole 301 for installing lifting bolts.

[0050] The lifting bolt installed at the fourth positioning hole 301 facilitates the lifting of the clamp. Since the clamp is heavy, it needs to be moved by a gantry crane. The lifting bolt facilitates the connection with the gantry crane.

[0051] In use, the cone is placed on the base 1 and fixed with countersunk bolts. The positioning plate 3 is placed on the outer wall of the cone and fixed with countersunk bolts. The guide ring 4 is placed on the outer wall of the cone and placed above the positioning plate 3 and fixed with countersunk bolts. The arc tile 6 is placed on the lower surface of the pressure block 5. Then, the connecting bolt 503 passes through the washer 504 and the sliding cylinder 502 in the mounting hole 501 and connects with the second positioning hole 601 on the arc tile 6 to fix the arc tile 6. The bottom end of the double-ended screw 7 with the pull rod 8 is inserted into the first positioning hole 803, and the guide block 805 slides in along the guide groove 701. The locking bolt 804 is used to connect and fix it, thereby fixing the double-ended screw 7 and the pull rod 8 together. The pull rod 8 is inserted from the first through hole 101 of the pressure block 5. The annular positioning plate at the top of the pull rod 8 is fixed to the pressure block 5 with countersunk bolts.

[0052] A lifting bolt is installed in the fourth positioning hole 301 on the side wall of the positioning plate 3. The fixture is lifted by a gantry crane and placed on the workbench of the external working equipment. The bottom end of the double-ended screw 7 is connected to the power mechanism of the external working equipment. The gear to be processed is lifted above the fixture by the gantry crane and lowered from above the fixture to fit on the outside of the cone. It is supported by the gear to be processed on the positioning plate 3. Then, the power mechanism of the external working equipment pulls the double-ended screw 7 downward. The double-ended screw 7 drives the pull rod 8 to move downward, which in turn drives the pressure block 5 to move downward. The movement of the pressure block 5 causes the arc tile 6 to move along with it. While moving downward, the arc tile 6 moves along the inclined surface at the top of the cone. The arc tile 6 will expand outward radially, so that the arc tile 6 abuts against the inner side wall of the gear, completing the clamping and positioning of the gear, and the gear hobbing operation can then be performed.

[0053] In practical use, the positioning plate 3 can be equipped with ejector holes to lift the machined gear, making it easy to move the gear.

[0054] There are 6 identical arc-shaped tiles 6, which can be spliced ​​together to form a ring structure.

[0055] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A hobbing fixture for a differential gear ring of a tractor vehicle, characterized in that, The device includes a base with a conical seat. A positioning plate and a guide ring are fitted around the outside of the conical seat, with the guide ring positioned above the positioning plate. The diameter of the top of the conical seat is smaller than that of the middle part, forming a frustum-shaped structure. A pressure block is provided at the top of the conical seat. A first through hole is opened in the middle of the base, a second through hole is opened in the middle of the frustum, and a third through hole is opened in the middle of the pressure block. The first, second, and third through holes are connected. A pull rod is provided in the third through hole of the pressure block. An annular connecting plate is provided on the top edge of the pull rod, and the annular connecting plate is connected to the pressure block. The bottom of the pull rod is located in the second through hole, and a double-ended screw is connected to the bottom end of the pull rod. Multiple arc-shaped tiles are evenly distributed on the lower surface of the pressure block in a ring shape. The inner sidewall of each arc-shaped tile is an inclined surface that matches the top sidewall of the conical seat. The arc-shaped tiles are slidably arranged radially.

2. The hobbing fixture for a tractor differential gear ring according to claim 1, characterized in that, The center lines of the first through hole, the second through hole, and the third through hole are coaxially arranged.

3. The hobbing fixture for a tractor differential gear ring according to claim 1, characterized in that, The double-ended screw is a telescopic double-ended screw. The middle of the pull rod has a fourth through hole, and the bottom side wall of the pull rod has a first positioning hole. A locking bolt is provided in the first positioning hole, and the double-ended screw is fixed in the pull rod by the locking bolt.

4. A hobbing fixture for a tractor differential gear ring according to claim 3, characterized in that, The side wall of the end where the double-ended screw connects to the tie rod has a guide groove along the height direction, and the side wall at the bottom of the fourth through hole is provided with a guide block that cooperates with the guide groove.

5. A hobbing fixture for a tractor differential gear ring according to claim 1, characterized in that, The top of the arc-shaped tile has a second positioning hole, and the pressure block has an installation hole. The arc-shaped tile and the pressure block are connected by a bolt through the positioning hole and the installation hole. A sliding cylinder is provided in the installation hole. The sliding cylinder is sleeved on the connecting bolt. The diameter of the sliding cylinder is smaller than the diameter of the installation hole. A washer is also sleeved on the connecting bolt. The washer is located at the top of the sliding cylinder, and the diameter of the washer is larger than the diameter of the installation hole.

6. A hobbing fixture for a tractor differential gear ring according to claim 1, characterized in that, The pressure block is provided with an anti-rotation hole, and a third positioning hole is provided at the corresponding position on the top surface of the cone seat. An anti-rotation bolt is provided in the anti-rotation hole, and one end of the anti-rotation bolt is located in the third positioning hole; the upper and lower edges of the pressure block are rounded.

7. A hobbing fixture for a differential gear ring of a tractor vehicle according to claim 1, characterized in that, The outer edge of the cone is provided with an annular groove, and the positioning disk and guide ring are located in the annular groove.

8. A hobbing fixture for a differential gear ring of a tractor vehicle according to claim 1, characterized in that, The cone seat is connected to the base by countersunk bolts, the positioning plate is connected to the cone seat by countersunk bolts, and the guide ring is connected to the positioning plate by countersunk bolts.

9. A hobbing fixture for a tractor differential gear ring according to claim 1, characterized in that, The base has a locking hole in the middle of its upper surface, and the bottom surface of the cone seat has an annular locking block that matches the locking hole. The inner wall of the annular locking block is flush with the inner wall of the second through hole.

10. A hobbing fixture for a differential gear ring of a tractor vehicle according to claim 1, characterized in that, The side wall of the positioning plate is provided with a fourth positioning hole for installing lifting bolts.

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