Hobbing clamp for large-diameter gear

Abstract

The utility model discloses a hobbing clamp for a large-diameter gear, which comprises a base and a supporting seat, and the base and the supporting seat are both of hollow structures and are internally communicated with each other; a body is further coaxially arranged in the supporting seat, a pull rod containing cavity penetrating through the body is formed in the axis direction of the body, a pull rod is arranged in the pull rod containing cavity in a penetrating mode, the body is further sleeved with an expansion sleeve, the expansion sleeve is in a hollow cylinder shape, the inner side face of the expansion sleeve is a conical face, and the inner side face is matched with the outer side face of the end, with the smaller diameter, of the inner side face body. The outer side face of the end of the pull rod is further sleeved with a pressing disc, the pressing cover, the base and the supporting base are coaxially arranged, the upper tip is installed on the pressing cover and is opposite to the supporting base, and a gear installation cavity is formed between the pressing cover and the supporting base. The hobbing clamp for the large-diameter gear is good in structural rigidity, and the machining precision of the tooth portion of the large-diameter gear is good; and according to the sizes of inner holes and end faces of the parts, only the expansion sleeves, the supports and the glands need to be replaced, and rapid production replacement can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a gear hobbing fixture for large-diameter gears. Background Art

[0002] The outer diameter and axial dimensions of the gears for mining vehicles and new energy transmissions are large. The rigidity of the original gear hobbing fixture is not enough to ensure the accuracy of the teeth of the existing large gears. The original gear hobbing fixture is suitable for processing parts with a diameter of less than Ф250. When processing parts with a diameter of more than Ф250, the fixture is not rigid enough, resulting in poor part processing accuracy and tool hitting during the processing. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a gear hobbing fixture for large-diameter gears, so as to solve the problem that the gear hobbing fixture in the prior art is insufficient in rigidity and leads to poor parts processing accuracy.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions to achieve the above problems: a gear hobbing fixture for large diameter gears, including a base and a support seat installed on the base, wherein the base and the support seat are both hollow structures and are internally connected.

[0005] A main body is coaxially arranged inside the support seat. The main body is generally in the shape of a truncated cone. A pull rod accommodating cavity that passes through the main body is opened along the main body's own axial direction. A section of the main body with a larger diameter is installed on the base.

[0006] A pull rod is arranged through the pull rod accommodating cavity, one end of the pull rod extends out of an end of the body with a smaller diameter, and the other end of the pull rod extends out of an end of the body with a larger diameter and extends into the base.

[0007] An expansion sleeve is sleeved on the end of the body with a smaller diameter. The expansion sleeve is in the shape of a hollow cylinder, and the inner side surface is a conical surface, which matches the outer side surface of the end of the inner side body with a smaller diameter.

[0008] A pressure plate is sleeved on the outer side surface of the end of the pull rod extending out of the end of the main body with a smaller diameter, and the pressure plate abuts against the upper surface of the expansion sleeve.

[0009] The gear hobbing fixture for large-diameter gears also includes a pressure cover coaxially arranged with the base and the support seat, and an upper tip installed on the pressure cover facing away from the support seat, and a gear installation cavity is formed between the pressure cover and the support seat.

[0010] The utility model also has the following technical features:

[0011] The pull rod comprises an upper pull rod and a lower pull rod which are coaxially connected.

[0012] One end of the upper pull rod extends out of an end of the body with a smaller diameter, and the other end is located inside the body; one end of the lower pull rod is connected to the upper pull rod, and the other end extends out of an end of the body with a larger diameter and extends into the base.

[0013] The pressure plate is installed on the upper pull rod.

[0014] The upper pull rod and the lower pull rod are connected by threads, and one end of the lower pull rod extending into the base is also provided with threads.

[0015] A first clamping ring is also installed on the inner side surface of one end of the expansion sleeve abutting against the pressure plate.

[0016] A gasket is installed between the pressure plate, the expansion sleeve and the body. The gasket is in the shape of a hollow cylinder and is sleeved on the pull rod.

[0017] The top end of the gasket abuts against the pressure plate, and the bottom end abuts against the body. A second clamping ring is also installed along the circumferential direction on the outer side surface of a section of the gasket abutting against the body.

[0018] The first snap ring matches with the second snap ring.

[0019] The washer is connected to the pressure plate via screws.

[0020] Oil holes are also arranged in the upper pull rod, and the oil holes include a first oil hole opened on the side of the upper pull rod away from the pressure plate, a main oil hole along the axial direction of the upper pull rod itself, and a second oil hole opened on the side of the upper pull rod close to the pressure plate. The first oil hole, the main oil hole and the second oil hole are connected to each other, and the outlet of the first oil hole is arranged on the upper pull rod, and the outlet of the second oil hole is arranged on the pressure plate.

[0021] The main body is also provided with an oil circuit, which is communicated with the second oil hole.

[0022] The top end of the pressure plate is also covered with an end cover.

[0023] Compared with the prior art, the utility model has the following technical effects:

[0024] (I) The utility model provides a gear hobbing fixture for large-diameter gears, which has good structural rigidity and can process large-diameter gear teeth with good precision. Moreover, according to the size of the inner hole and end face of the part, only the expansion sleeve, support and pressure cover need to be replaced during production change, so that rapid production change can be achieved.

[0025] (II) The gear hobbing fixture for large-diameter gears provided by the utility model is provided with oil passages inside the pull rod and the body, so as to facilitate the flushing of iron chips by cutting fluid.

[0026] (III) The gear hobbing fixture for large-diameter gears provided by the utility model has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a schematic cross-sectional view of the overall structure of the gear hobbing fixture for large-diameter gears.

[0028] Figure 2 for Figure 1 A partial enlarged schematic diagram of .

[0029] Figure 3 It is a structural schematic diagram of the upper pull rod of the utility model.

[0030] Figure 4 It is a structural schematic diagram of the oil hole of the utility model.

[0031] The meaning of each symbol in the accompanying drawings:

[0032] 1-base, 2-support seat, 3-body, 4-pull rod accommodating cavity, 5-pull rod, 6-expansion sleeve, 7-pressure plate, 8-pressure cover, 9-upper center, 10-washer, 11-oil hole, 12-end cover, 13-gear to be processed.

[0033] 5-1 pull-up bar, 5-2 pull-down bar.

[0034] 11-1 first oil hole, 11-2 main oil hole, 11-3 second oil hole.

[0035] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] All components in the present invention, unless otherwise specified, are components known in the prior art.

[0037] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0038] Embodiment 1:

[0039] This embodiment provides a gear hobbing fixture for large diameter gears, such as Figure 1-Figure 2 As shown, it includes a base 1 and a support base 2 installed on the base 1. The base 1 and the support base 2 are both hollow structures and are internally connected.

[0040] A body 3 is coaxially arranged inside the support seat 2 . The body 3 is generally in the shape of a truncated cone. A rod accommodating cavity 4 that passes through the body 3 is formed along the axis of the body 3 . A section of the body 3 with a larger diameter is mounted on the base 1 .

[0041] A pull rod 5 is disposed through the pull rod accommodating cavity 4 , one end of the pull rod 5 extends out of an end of the body 3 with a smaller diameter, and the other end of the pull rod 5 extends out of an end of the body 3 with a larger diameter and extends into the base 1 .

[0042] An expansion sleeve 6 is sleeved on the end of the body 3 with a smaller diameter. The expansion sleeve 6 is in the shape of a hollow cylinder, and the inner side surface is a conical surface, and the inner side surface cooperates with the outer side surface of the end of the body 3 with a smaller diameter.

[0043] A pressure plate 7 is sleeved on the outer side of the end of the pull rod 5 extending out of the end of the body 3 with a smaller diameter, and the pressure plate 7 is in contact with the upper surface of the expansion sleeve 6 .

[0044] The gear hobbing fixture for large diameter gears also includes a pressure cover 8 coaxially arranged with the base 1 and the support seat 2 and an upper tip 9 installed on the pressure cover 8 facing away from the support seat 2, and a gear installation cavity is formed between the pressure cover 8 and the support seat 2.

[0045] The base 1 is connected to the machine tool worktable, the pull rod 5 is connected to the inner pull rod of the machine tool spindle, and the gear 13 to be processed is sleeved on the outside of the expansion sleeve 6. When the hydraulic cylinder is clamped, the inner pull rod drives the pull rod 5 to move downward, drives the pressure plate 7 to move downward, and the pressure plate 7 drives the expansion sleeve 6 to move downward, and fits tightly against the conical surface of the body 3. The expansion sleeve 6 expands and tightens the gear 13 to be processed, and then the upper center 9 is connected to the pressure cover 8, moves downward, and presses on the end face of the gear 13 to be processed, so that the gear 13 to be processed can be hobbed.

[0046] When the hydraulic cylinder in the machine tool is released, the inner pull rod is relaxed, and the expansion sleeve 6 moves upward along the body 3 to release the gear 13 to be processed.

[0047] Beneficial effects: The fixture has good structural rigidity and can process large-diameter gear teeth with good precision. Moreover, according to the size of the inner hole and end face of the part, only the expansion sleeve, support and gland need to be replaced to change production, which can achieve rapid production change.

[0048] As a preferred embodiment of this invention:

[0049] like Figure 3 As shown, the pull rod 5 includes an upper pull rod 5-1 and a lower pull rod 5-2 which are coaxially connected.

[0050] One end of the upper pull rod 5-1 extends out from the end of the body 3 with a smaller diameter, and the other end is located inside the body 3. One end of the lower pull rod 5-2 is connected to the upper pull rod 5-1, and the other end extends out from the end of the body 3 with a larger diameter and extends into the base 1.

[0051] The pressure plate 7 is installed on the upper pull rod 5-1.

[0052] The main body 3 and the support seat 2 are also respectively installed with set screws. When the pull rod 5 moves into place, the set screws are used to circumferentially position the upper pull rod 5-1 and the lower pull rod 5-2.

[0053] As a preferred embodiment of this invention:

[0054] The upper pull rod 5-1 and the lower pull rod 5-2 are connected by threads, and one end of the lower pull rod 5-2 extending into the base 1 is also provided with threads.

[0055] As a preferred embodiment of this invention:

[0056] A first clamping ring is also installed on the inner side surface of one end of the expansion sleeve 6 that abuts against the pressure plate 7.

[0057] A gasket 10 is installed between the pressure plate 7 , the expansion sleeve 6 and the body 3 . The gasket 10 is in the shape of a hollow cylinder and is sleeved on the pull rod 5 .

[0058] The top end of the gasket 10 abuts against the pressure plate 7, and the bottom end abuts against the body 3. A second clamping ring is also installed along the circumferential direction on the outer side surface of a section of the gasket 10 abutting against the body 3.

[0059] The first snap ring matches with the second snap ring.

[0060] The washer 10 is connected to the pressure plate 7 via screws.

[0061] When the hydraulic cylinder in the machine tool is released, the inner pull rod is relaxed, and the pressure plate 7 drives the washer 10 to drive the expansion sleeve 6 to move upward along the body 3, releasing the gear 13 to be processed.

[0062] As a preferred embodiment of this invention:

[0063] like Figure 4 As shown, an oil hole 11 is also arranged in the upper pull rod 5-1, and the oil hole 11 includes a first oil hole 11-1 opened on the side of the upper pull rod 5-1 away from the pressure plate 7, a main oil hole 11-2 along the axial direction of the upper pull rod 5-1 itself, and a second oil hole 11-3 opened on the side of the upper pull rod 5-1 close to the pressure plate 7. The first oil hole 11-1, the main oil hole 11-2 and the second oil hole 11-3 are connected to each other, and the outlet of the first oil hole 11-1 is arranged on the upper pull rod 5-1, and the outlet of the second oil hole 11-3 is arranged on the pressure plate 7.

[0064] The body 3 is also provided with an oil circuit, which is connected with the second oil hole 11 - 3 .

[0065] Oil circuits are arranged inside the upper pull rod 5-1 and the main body 3, and the iron chips attached to the surface of the fixture can be flushed away with cutting oil to prevent the iron chips from affecting the processing accuracy of the parts.

[0066] As a preferred embodiment of this invention:

[0067] The top end of the pressure plate 7 is also covered with an end cover 12 .

[0068] The specific working process of this embodiment is as follows:

[0069] The working process of the gear rolling fixture is as follows: the base 1 is connected to the machine tool worktable, the lower pull rod 5-2 is connected to the inner pull rod of the machine tool spindle, the support seat 2 is connected to the base 1 through a hexagon socket cylindrical head screw, and the support inner wall is set to be thicker to enhance the rigidity of the fixture; the main body 3 is connected to the base 1 through a hexagon socket cylindrical head screw.

[0070] The expansion sleeve 6 is configured as a single-cone adhesive expansion sleeve, the outer cone of the body 3 is matched with the inner cone of the expansion sleeve 6, and the upper pull rod 5-1 is connected with the lower pull rod 5-2 by threads. An oil circuit is configured inside the upper pull rod 5-1, and hydraulic oil is sprayed from the inner cavity of the fixture, enters the pull rod, enters the main oil hole 11-2 in the upper pull rod 5-1 through the first oil hole 11-1, and finally sprayed out through the second oil hole 11-3 to wash away the iron filings around the expansion sleeve, thereby ensuring the clamping accuracy of the parts.

[0071] When installing the fixture, the first oil hole 11-1 is connected to the oil circuit set on the main body. The angle range of the oil circuit on the main body is 70° to 80°, which ensures that the hydraulic oil in the main body oil circuit can be sprayed out to wash away the iron filings on the support K surface to prevent the parts from being damaged. An end cover 7 is set at the upper end of the pull rod 6, and a gasket 10 is set at the lower end of the pull rod 6 to drive the expansion sleeve 6 to move upward. When the hydraulic cylinder in the machine tool is released, the gasket 10 drives the expansion sleeve 6 to move upward to release the parts. On the contrary, when the hydraulic cylinder is clamped, it drives the upper pull rod 5-1 to move downward, and the expansion sleeve 6 moves downward and fits tightly with the conical surface of the main body 3. The expansion sleeve 6 expands and tightens the gear 13 to be processed, and then the upper center 12 is connected to the pressure cover 8, moves downward, and presses on the end face of the gear 13 to be processed, so that the gear 13 to be processed can be hobbed.

[0072] The expansion sleeve adopts a double-cone design to ensure that the expansion sleeve, the pull rod and the body are tightened.

[0073] Oil circuits are set inside the pull rod and the body to facilitate the cutting fluid to flush out iron chips.

[0074] The fixture can be quickly replaced. According to the size of the inner hole and end face of the part, only the expansion sleeve, support and pressure cover need to be replaced.

[0075] The above technical solutions are only preferred specific implementation methods of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be thought of by any technician familiar with the field within the technical scope disclosed by the present utility model without creative work are all covered within the protection scope of the present utility model.

Claims

1. A gear hobbing fixture for large diameter gears, comprising a base (1), characterized in that: It also includes a support base (2) mounted on the base (1), wherein the base (1) and the support base (2) are both hollow structures and are internally connected; A body (3) is coaxially arranged inside the support seat (2). The body (3) is generally in the shape of a truncated cone. A pull rod accommodating cavity (4) that passes through the body (3) is provided along the axis of the body (3). A section of the body (3) with a larger diameter is mounted on the base (1). A pull rod (5) is provided through the pull rod accommodating cavity (4), one end of the pull rod (5) extends out of an end of the body (3) with a smaller diameter, and the other end of the pull rod (5) extends out of an end of the body (3) with a larger diameter and extends into the base (1); An expansion sleeve (6) is sleeved on the end of the body (3) with a smaller diameter. The expansion sleeve (6) is in the shape of a hollow cylinder, and the inner side surface is a conical surface. The inner side surface cooperates with the outer side surface of the end of the inner side body (3) with a smaller diameter. A pressure plate (7) is sleeved on the outer side of the end of the pull rod (5) extending out of the body (3) at the end with a smaller diameter, and the pressure plate (7) is in contact with the upper surface of the expansion sleeve (6); The gear hobbing fixture for large-diameter gears also includes a pressure cover (8) coaxially arranged with the base (1) and the support seat (2) and an upper tip (9) mounted on the pressure cover (8) in a direction away from the support seat (2), and a gear installation cavity is formed between the pressure cover (8) and the support seat (2).

2. The gear hobbing fixture for large diameter gears according to claim 1, characterized in that: The pull rod (5) comprises an upper pull rod (5-1) and a lower pull rod (5-2) which are coaxially connected; One end of the upper pull rod (5-1) extends out of the end of the body (3) with a smaller diameter, and the other end is located inside the body (3); one end of the lower pull rod (5-2) is connected to the upper pull rod (5-1), and the other end extends out of the end of the body (3) with a larger diameter and extends into the base (1); The pressure plate (7) is installed on the upper pull rod (5-1).

3. The gear hobbing fixture for large diameter gears according to claim 2, characterized in that: The upper pull rod (5-1) and the lower pull rod (5-2) are connected via threads, and one end of the lower pull rod (5-2) extending into the base (1) is also provided with threads.

4. The gear hobbing fixture for large diameter gears according to claim 1, characterized in that: A first clamping ring is also installed on the inner side surface of one end of the expansion sleeve (6) abutting against the pressure plate (7); A gasket (10) is also installed between the pressure plate (7), the expansion sleeve (6) and the body (3); the gasket (10) is in the shape of a hollow cylinder and is sleeved on the pull rod (5); The top end of the gasket (10) abuts against the pressure plate (7), and the bottom end abuts against the body (3); a second clamping ring is also installed along the circumferential direction on the outer side surface of a section where the gasket (10) abuts against the body (3); The first snap ring matches with the second snap ring; The washer (10) is connected to the pressure plate (7) via screws.

5. The gear hobbing fixture for large diameter gears according to claim 2, characterized in that: The upper pull rod (5-1) is also provided with oil holes (11), and the oil holes (11) include a first oil hole (11-1) provided on the side of the upper pull rod (5-1) away from the pressure plate (7), a main oil hole (11-2) along the axis of the upper pull rod (5-1), and a second oil hole (11-3) provided on the side of the upper pull rod (5-1) close to the pressure plate (7). The first oil hole (11-1), the main oil hole (11-2), and the second oil hole (11-3) are interconnected, and the outlet of the first oil hole (11-1) is provided on the upper pull rod (5-1), and the outlet of the second oil hole (11-3) is provided on the pressure plate (7); The main body (3) is also provided with an oil circuit, and the oil circuit is connected with the second oil hole (11-3).

6. The gear hobbing fixture for large diameter gears according to claim 1, characterized in that: The top end of the pressure plate (7) is also covered with an end cover (12).

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