Clamp for gear shaft hobbing

Abstract

The utility model relates to a gear shaft hobbing fixture in the technical field of gear shaft processing, which comprises a support, a gear shaft hobbing fixture, a gear shaft hobbing fixture and a gear shaft hobbing fixture, and is characterized in that the support is provided with a center hole; the rigid conical sleeves are sequentially matched, stacked and sleeved on the inner side of the conical part from outside to inside; the rigid outer conical reducing sleeve is arranged on the inner side of the rigid conical sleeve in a matched and sleeved mode, and a plurality of axial necking grooves are evenly formed in the small end of the rigid outer conical reducing sleeve at intervals in the circumferential direction of the rigid outer conical reducing sleeve so that the gear shaft can be held tightly in a reducing mode under the cooperation of the rigid conical sleeve; wherein the upper end of the rigid outer conical reducing sleeve extends to the upper part of the rigid conical sleeve; by adopting the nested structure of the rigid conical sleeves and the rigid outer conical reducing sleeves, the rigid conical sleeves with the appropriate number and the rigid outer conical reducing sleeves with the appropriate size can be selected according to the diameter of the gear shaft, the adaptive capacity of the fixture is improved, and the technical problem of poor universality in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear shaft machining technical field especially relates to a gear shaft hobbing clamp. BACKGROUND

[0002] Gear hobbing is an important process in gear machining, and the machining precision will directly affect the machining efficiency and quality of gear grinding. The hobbing machining precision depends on the manufacturing and installation precision of the hobbing clamp. If the manufacturing and installation precision of the hobbing clamp is not high, the radial runout and tooth error of the gear ring will occur, and the installation precision of the gear blank also mainly depends on the manufacturing and installation precision of the clamp. The clamping and alignment process of most hobbing clamps is complicated and labor-intensive.

[0003] The existing Chinese patent with publication number CN215658245U discloses a clamp device for machining gear shafts, which comprises a support having a central hole, the upper section of the central hole is a tapered hole, the inner side of the tapered hole is provided with a transition sleeve matched therewith, the transition sleeve is made of elastic material and has an axial gap, the shaft body is clamped by deforming the transition sleeve, the positioning and installation of the gear shaft are completed, the offset and inclination of the shaft part can be effectively avoided, the repeated alignment operation of the shaft part is not needed, and the machining efficiency of the shaft part can be effectively improved. However, the device still has the following defects: 1. The transition sleeve is made of elastic material, after the shaft part is installed, the transition sleeve is in a state of being compressed and fitted to the shaft body and the wall of the tapered hole, and it is difficult to take out; 2. In the actual application process, the size of the support and the transition sleeve needs to be determined and made according to the actual situation and actual demand, and the device lacks universality, and the support needs to be replaced (dismounted, installed and aligned) every time the type is changed, which is time-consuming and labor-intensive; 3. When the wall of the tapered hole is worn, the wall of the support hole is difficult to repair (for example, if the transition sleeve needs to be redesigned and made, the period is long), and the replacement and maintenance cost is large.

[0004] Therefore, we designed a gear shaft hobbing clamp. UTILITY MODEL CONTENTS

[0005] In order to overcome the deficiencies in the background art, the utility model discloses a gear shaft hobbing clamp.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A gear shaft hobbing clamp comprises:

[0008] The support has a central hole, and the top of the central hole is a tapered portion;

[0009] A plurality of rigid tapered sleeves are matched and stacked in the inner side of the tapered portion from outside to inside;

[0010] A rigid outer conical reducing sleeve is matched and arranged inside the rigid conical sleeve, and a plurality of axial necking grooves are uniformly and spaced apart along the circumferential direction of the small end of the rigid outer conical reducing sleeve, so that the rigid conical sleeve is used to reduce the diameter and tightly hold the gear shaft.

[0011] The upper end of the rigid outer conical reducing sleeve extends above the rigid conical sleeve.

[0012] Further, a conical neck expanding part is arranged at the top of the center hole, and a conical protective sleeve is matched and arranged on the conical neck expanding part, and the inner wall surface of the conical protective sleeve forms a conical part.

[0013] Further, an annular flange is arranged on the outer edge of the conical protective sleeve and is attached to the top surface of the support through a connecting piece.

[0014] Further, a lower center is slidably connected to the cavity of the center hole, and a spring is arranged at the lower end of the lower center.

[0015] Further, an up-down driving structure is arranged below the spring in the cavity of the center hole, so as to fix or disassemble the gear shaft.

[0016] Further, the up-down driving structure comprises:

[0017] A rotating ring is rotatably connected to the cavity of the center hole, and a worm gear structure is connected to the outer side of the rotating ring;

[0018] A drive screw is slidably connected to the cavity of the center hole and penetrates the rotating ring, and the drive screw is threadedly matched with the rotating ring.

[0019] The spring is arranged between the drive screw and the lower center.

[0020] Further, an end plate is arranged at the bottom of the support, and a plurality of mounting holes and positioning holes are uniformly and spaced apart along the circumferential direction of the end plate; and a positioning mandrel is detachably connected to the positioning hole, and is used for positioning the support.

[0021] Further, the positioning mandrel comprises:

[0022] A hollow shaft body has a lower conical hole part, a threaded hole part and an upper conical hole part in sequence from bottom to top in the inner cavity thereof, and a plurality of axial neck expanding grooves are uniformly arranged along the circumferential direction of the lower conical hole part and the upper conical hole part;

[0023] A connecting bolt has a lower conical section, a threaded section and an upper conical section in sequence from bottom to top; the threaded section is matched with the threaded hole part, the lower conical section is pressed to expand the diameter of the lower conical hole part, and the upper conical section is pressed to expand the diameter of the upper conical hole part.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] 1. By adopting the nested structure of the rigid conical sleeve and the rigid outer conical reducing sleeve, cooperating with the axial necking groove, the rigid conical sleeve and the rigid outer conical reducing sleeve are not required to rely on the compression deformation of the elastic material when the gear shaft is clamped, the difficulty problem of taking out caused by the compression fit of the elastic material transition sleeve is avoided, and the adaptability of the clamp is improved by selecting the appropriate number of rigid conical sleeves and the appropriate size of rigid outer conical reducing sleeves according to the diameter of the gear shaft, thereby solving the technical problem of poor universality in the prior art.

[0026] 2. The detachable conical protective sleeve is connected with the support through the annular flange, when the conical part is worn, only the conical protective sleeve needs to be replaced instead of the whole support, thereby greatly reducing the maintenance cost and period. In addition, the positioning mandrel is expanded in diameter through the hollow shaft body and the connecting bolt, the rapid and accurate positioning of the support and the rotating disc of the machining equipment is realized, the recentering operation of the support is performed when the type is changed, and the type changing efficiency is improved.

[0027] 3. The pre-positioning structure of the lower center is matched with the spring, the rotating ring and the driving screw driven by the worm gear can automatically correct the center position when the gear shaft is inserted, and the deflection is prevented.

[0028] 4. The upper and lower driving structures control the driving screw to ascend and descend, the gear shaft can be lifted by the lower center after the machining is completed, the rigid outer conical reducing sleeve is loosened, the gear shaft can be easily taken out at this time, the risk of overloading of the equipment in manual operation is avoided, the difficulty of taking out is reduced, and the safety factor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the utility model;

[0030] Figure 2 It is an explosion structural schematic view of the utility model;

[0031] Figure 3 It is a sectional view of the utility model in the use state;

[0032] Figure 4 It is Figure 3 the I partial enlarged view in the

[0033] Figure 5 It is a structural schematic view of the hollow shaft body in the utility model.

[0034] In the figure: A, machining equipment turntable; B, gear shaft; 1, support; 11, center hole; 111, conical expansion neck part; 12, conical part; 13, end plate part; 2, rigid conical sleeve; 3, rigid outer conical reduced sleeve; 31, axial necking groove; 4, conical protective sleeve; 41, annular flange; 5, lower center; 6, spring; 7, rotating ring; 8, drive screw, 9, positioning mandrel; 91, hollow shaft body; 911, lower conical hole part; 912, threaded hole part; 913, upper conical hole part; 914, axial expansion necking groove; 92, connecting bolt; 921, lower conical segment, 922, threaded segment; 923, upper conical segment. DETAILED DESCRIPTION

[0035] The utility model can be explained in detail through the following examples, the purpose of the utility model is disclosed in the utility model range all technical improvements are protected, in the description of the utility model, need understanding is, if there are terms "upper", "lower", "front", "back", "left", "right" etc. Indicated orientation or positional relationship, only is with the drawing of the application of the present application, for the convenience of describing the utility model;Need understanding is, if there are terms "end", "side", "end part", "side part", "transverse", "longitudinal" etc. Indicated orientation or positional relationship, only is the length and width of the corresponding component corresponds to, i.e. "end part" indicates the head and tail area of the length direction of the corresponding component, "side part" indicates the head and tail area of the width direction of the corresponding component;For the convenience of describing the utility model and not indicating or suggesting the device or element must have a particular orientation.

[0036] Example one, combine with the attached Figures 1-5 A kind of gear shaft hobbing fixture, comprising:

[0037] Support 1: support 1 is the basic supporting component of fixture, the center is provided with the center hole 11 passing through upper and lower ends.The top of center hole 11 is conical part 12, which is used to install subsequent components.The bottom of support 1 is provided with end plate part 13, a plurality of mounting holes and positioning holes are uniformly opened along the circumference of end plate part 13, the positioning hole is fixed to machining equipment turntable A through positioning mandrel 9, the support 1 is positioned, it is guaranteed that no alignment treatment is needed after installing support 1;The mounting hole is fixed to machining equipment turntable A through bolt.

[0038] Combine with the attached Figures 1-3, the inner side of the conical part 12 is sequentially stacked with several layers of rigid conical sleeves 2. The outer conical surface of each layer of rigid conical sleeves 2 matches the inner conical surface of the adjacent sleeve, forming a stable nested structure. The innermost layer of rigid conical sleeves 2 is sleeved with a rigid outer conical reducing sleeve 3, and a plurality of axial necking grooves 31 are uniformly arranged on the small end of the rigid outer conical reducing sleeve 3; the upper end of the rigid outer conical reducing sleeve 3 extends above the rigid conical sleeve 2. When the gear shaft B is inserted, its stepped surface faces downward to the top surface of the rigid outer conical reducing sleeve 3, so that the rigid outer conical reducing sleeve 3 is reduced in diameter to tightly hold the gear shaft B under the extrusion of the rigid conical sleeve 2, achieving high-precision positioning.

[0039] The accompanying drawings are referred to in conjunction with the Figure 3 A lower center 5 is slidably connected in the central hole 11, and a spring 6 is arranged at the lower end of the lower center 5. An up-down driving structure is arranged below the spring 6, including a rotating ring 7 and a driving screw 8. The rotating ring 7 is connected with an external driving device through a worm gear structure, and the driving screw 8 penetrates through the rotating ring 7 and is threadedly connected with the lower end of the rotating ring 7. When the rotating ring 7 is rotated, the driving screw 8 moves up and down along the central hole 11, that is, when the gear shaft B is installed, the central hole at the bottom of the gear shaft B is first supported by the lower center 5 to prevent the gear shaft B from being deflected, and as the gear shaft B moves downward, the spring 6 is gradually compressed until the gear shaft B is tightly held by the rigid outer conical reducing sleeve 3. At this time, the rotating ring 7 can be rotated by the external driving device through the worm gear structure to make the driving screw 8 descend, so as to release the elastic potential energy of the spring 6 and ensure that the gear shaft B is firmly fixed. According to the actual needs, the elastic potential energy of the spring 6 can also be released before the gear shaft B is tightly held by the rigid outer conical reducing sleeve 3, and the specific operation is not limited here. After the gear shaft B is machined, the rotating ring 7 can be rotated by the external driving device through the worm gear structure to make the driving screw 8 ascend, and then the lower center 5 ascends until the rigid outer conical reducing sleeve 3 loses the holding effect on the gear shaft B. At this time, the gear shaft B can be taken down by hoisting equipment, and the overload of the hoisting equipment can be effectively prevented (such as wire rope breakage), thereby improving the safety factor.

[0040] It should be noted that the driving screw 8 does not rotate relative to the support 1, for example, a sliding guide structure is arranged between the driving screw 8 and the central hole 11, such as a sliding rail and sliding groove matching structure.

[0041] The accompanying drawings are referred to in conjunction with the Figures 4-5, positioning mandrel 9; it includes hollow shaft body 91 and connecting bolt 92. The inner cavity of hollow shaft body 91 is divided into lower conical hole part 911, threaded hole part 912 and upper conical hole part 913, and a plurality of axial expansion grooves 914 are arranged along the circumference of lower conical hole part 911 and upper conical hole part 913. The threaded section 922 of the connecting bolt 92 cooperates with the threaded hole part 912, and the lower conical hole part 911 and the upper conical hole part 913 of the hollow shaft body 91 are expanded by the lower conical section 921 and the upper conical section 923, respectively. The expansion of the lower conical hole part 911 of the hollow shaft body 91 will fix the positioning mandrel 9 on the machining equipment turntable A, and the expansion of the upper conical hole part 913 will lock the support 1, ensuring the accurate positioning of the support 1 and the machining equipment turntable A.

[0042] Embodiment two, combined with the attached Figures 1-3 A gear shaft hobbing fixture, which is different from the embodiment one in that the top of the center hole 11 is provided with a tapered expansion neck part 111, the tapered expansion neck part 111 is sleeved with a tapered protective sleeve 4, and the inner wall surface thereof forms the tapered part 12. The outer edge of the tapered protective sleeve 4 is provided with an annular flange 41, which is detachably connected to the top surface of the support 1 through a connecting member such as a bolt. This design facilitates the replacement of the worn tapered protective sleeve 4 instead of the support 1, thereby reducing the maintenance cost.

[0043] In other embodiments, the up-down driving structure can be replaced by a hydraulic cylinder or a pneumatic device to directly push the driving screw 8 to move up and down, further improving the clamping efficiency.

[0044] Working principle: when clamping, the gear shaft B is inserted into the rigid outer tapered reducing sleeve 3, the rigid outer tapered reducing sleeve 3 is pressed to reduce in diameter by the rigid tapered sleeve 2, and is tightly held by the axial necking groove 31. When disassembling, rotate the rotating ring 7 to drive the driving screw 8 to rise and increase the spring pressure, so that the lower center 5 lifts the gear shaft B, at this time the rigid outer tapered reducing sleeve 3 rebounds, and the gear shaft B can be easily taken out.

[0045] The parts not described in detail in the utility model are prior art, and it is obvious for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model; therefore, no matter from which point of view, the above embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, and any figure reference in the claims should not be regarded as limiting the content of the involved claims.

Claims

1. A jig for hobbing gear shafts, characterized in that, include: Support (1) having a central hole (11) with a tapered portion (12) at the top; Several rigid conical sleeves (2) are sequentially matched and stacked on the inner side of the conical part (12) from the outside to the inside; A rigid outer conical reducing sleeve (3) is fitted inside the rigid conical sleeve (2). The small end of the rigid outer conical reducing sleeve (3) is provided with a plurality of axial necking grooves (31) evenly spaced along its circumference, so as to reduce the diameter and tighten the gear shaft under the cooperation of the rigid conical sleeve (2). The upper end of the rigid outer tapered reducing sleeve (3) extends above the rigid tapered sleeve (2).

2. The gear hobbing fixture according to claim 1, characterized in that: The top of the central hole (11) is provided with a tapered neck (111), and a tapered protective sleeve (4) is fitted on the tapered neck (111). The inner wall of the tapered protective sleeve (4) forms a tapered part (12).

3. A gear hobbing fixture according to claim 2, characterized in that: The outer edge of the conical protective sleeve (4) is provided with an annular flange (41) that fits against the top surface of the support (1). The annular flange (41) is detachably connected to the top surface of the support (1) through a connector.

4. A gear hobbing fixture according to claim 1, characterized in that: The central hole (11) is slidably connected to a lower tip (5), and a spring (6) is provided at the lower end of the lower tip (5).

5. A gear hobbing fixture according to claim 4, characterized in that: The central hole (11) cavity is located below the spring (6) and has an up-and-down driving structure to facilitate the fixing or disassembly of the gear shaft.

6. A gear hobbing fixture according to claim 5, characterized in that: The up-down driving structure includes: Rotating ring (7) is rotatably connected to the cavity of the central hole (11), and its outer side is connected by a worm gear structure; The drive screw (8) is slidably connected to the cavity of the central hole (11) and passes through the rotating ring (7). The drive screw (8) and the rotating ring (7) are threaded together. The spring (6) is located between the drive screw (8) and the lower center (5).

7. A gear hobbing fixture according to claim 1, characterized in that: The support (1) has an end plate (13) at its bottom. The end plate (13) has a plurality of mounting holes and positioning holes evenly spaced along its circumference. The positioning holes are detachably connected to a positioning spindle (9) for positioning the support (1).

8. A gear hobbing fixture according to claim 7, characterized in that: The positioning mandrel (9) includes: The hollow shaft (91) has a lower conical hole (911), a threaded hole (912) and an upper conical hole (913) in its inner cavity from bottom to top. Both the lower conical hole (911) and the upper conical hole (913) are provided with multiple axial necking grooves (914) along their circumference. The connecting bolt (92) consists of a lower tapered section (921), a threaded section (922), and an upper tapered section (923) from bottom to top. The threaded section (922) engages with the threaded hole (912), causing the lower tapered section (921) to press the lower tapered hole (911) to expand its diameter and the upper tapered section (923) to press the upper tapered hole (913) to expand its diameter.

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