High-positioning-precision turning tool

Abstract

The utility model relates to a high-positioning-precision turning tool, and belongs to the technical field of rotor clamps. Comprising a vehicle body, a protruding cylinder is arranged at the center of one end face of the vehicle body, and a positioning hole is formed in the center of the end face of the protruding cylinder; a first threaded hole is formed in the center of the inner bottom face of the positioning hole, a second threaded hole is formed in the center of the inner bottom face of the first threaded hole, a part lifting nut is connected into the first threaded hole in a threaded mode, and a positioning sleeve is connected into the positioning hole in an inserted mode. The press-in mechanism comprises a press-in screw rod and a press-in flat gasket, the press-in screw rod is sleeved with the press-in flat gasket, one end of the press-in screw rod is provided with a first external thread section, and the first external thread section is matched with the second threaded hole; the two sides of the end face of the protruding cylinder are each provided with a pressing mechanism, and the positioning sleeve is tightly pressed into the positioning hole through the two pressing mechanisms. The problem that an existing clamp cannot guarantee that jumping during rotor machining meets the requirement is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotor clamps, and in particular relates to a vehicle fixture with high positioning accuracy. Background Art

[0002] With the development of various vehicles, oil pumps are increasingly used. Cycloid gear pumps, with their compact structure and low price, are widely used as oil pumps. As user requirements for products increase, the precision of cycloid pump components is also becoming increasingly demanding. The accuracy of the rotor, a key component of cycloid pumps, has a direct impact on product performance. To improve rotor machining accuracy, an interference fit fixture is used to achieve the runout between the rotor tooth profile and the transmission hole. However, existing fixtures cannot guarantee the required runout during rotor machining. Therefore, a new high-precision vehicle fixture is needed to solve this problem. Utility Model Content

[0003] The utility model overcomes the shortcomings of the prior art, provides a high positioning precision lathe, and solves the problem that the prior clamp cannot ensure that the runout during rotor machining meets the requirements.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0005] A high positioning precision lathe, comprising a lathe body, a starting nut, a positioning sleeve, a pressing mechanism, and a clamping mechanism; the lathe body is a cylindrical structure, a protruding cylinder is provided at the center of one end face of the lathe body, and a cylindrical positioning hole is provided at the center of the end face of the protruding cylinder; a first threaded hole is provided at the center of the inner bottom face of the positioning hole, a second threaded hole is provided at the center of the inner bottom face of the first threaded hole, a starting nut is threaded inside the first threaded hole, and a positioning sleeve is inserted inside the positioning hole; the pressing mechanism comprises a pressing screw and a pressing flat washer, the pressing flat washer is sleeved on the outside of the pressing screw, a first external threaded section is provided at one end of the pressing screw, and the first external threaded section cooperates with the second threaded hole; a clamping mechanism is provided on both sides of the end face of the protruding cylinder, and the positioning sleeve is tightly pressed inside the positioning hole by the two clamping mechanisms.

[0006] Furthermore, the outer diameter of the protruding cylinder is smaller than the outer diameter of the vehicle body.

[0007] Furthermore, the second threaded hole is communicated with an end surface of the vehicle body on one side away from the protruding cylindrical section.

[0008] Furthermore, the positioning hole, the first threaded hole, and the second threaded hole are coaxially arranged, and the inner diameter of the positioning hole is larger than the inner diameter of the first threaded hole, and the inner diameter of the first threaded hole is larger than the inner diameter of the second threaded hole; a cylindrical transition step is provided at the center of the inner bottom surface of the positioning hole, and the inner diameter of the transition step is located between the inner diameters of the positioning hole and the first threaded hole.

[0009] Furthermore, the starting nut is a cylindrical structure, with an external thread provided on the outer side of the starting nut, and a regular hexagonal through hole with both ends passing through is provided at the axis of the starting nut. The external thread on the outer side of the starting nut is threadedly connected to the internal thread on the inner side of the first threaded hole; one end face of the starting nut is in contact with the internal bottom surface of the first threaded hole, and the other end face of the starting nut is flush with the internal bottom surface of the transition step.

[0010] Furthermore, the positioning sleeve is a cylindrical structure with both ends passed through, the outer cylindrical surface of the positioning sleeve contacts the inner cylindrical surface of the positioning hole, the length of the positioning sleeve is the same as the depth of the positioning hole, the inner end surface of the positioning sleeve contacts the inner bottom surface of the positioning hole, and the outer end surface of the positioning sleeve is flush with the end surface of the protruding cylinder.

[0011] Furthermore, a length guide is provided inside the opening at one outer end of the positioning sleeve, the inner wall of the length guide maintains a clearance fit with the outer wall of the workpiece, and the remaining inner wall of the positioning sleeve excluding the length guide maintains an interference fit with the outer wall of the workpiece.

[0012] Furthermore, a screw head is fixedly provided at one end of the pressed screw away from the first external threaded section, and an internal hexagonal countersunk hole is provided on the end face of the screw head; a second external threaded section is provided in the middle part of the pressed screw, and the outer diameter of the second external threaded section is larger than the outer diameter of the first external threaded section; the pressed flat washer is a cylindrical plate-like structure, and a third threaded hole with two ends passing through is provided at the axis of the pressed flat washer, and an internal thread is provided on the inner wall of the third threaded hole, and the internal thread of the third threaded hole cooperates with the external thread of the second external threaded section; the pressed flat washer is sleeved on the outside of the pressed screw between the screw head and the second external threaded section, the inner diameter of the pressed flat washer is larger than the outer diameter of the pressed screw between the screw head and the second external threaded section, the end face of one end of the pressed flat washer is in contact with the screw head, and the other end of the pressed flat washer maintains a distance from the second external threaded section.

[0013] Furthermore, each clamping mechanism includes a pressing plate, a supporting screw, and a fixing screw; the pressing plate is a square plate structure, the pressing plate contacts the end face of the protruding cylinder, and the pressing plate is perpendicular to the axis of the lathe body; one end of the pressing plate extends to the outer end opening of the positioning hole, and the other end of the pressing plate extends to the outside of the protruding cylinder; a screw through hole and a fourth threaded hole are provided on the pressing plate; a fifth threaded hole is provided on the end face of the lathe body close to the protruding cylinder, and the fifth threaded hole corresponds to the screw through hole.

[0014] Furthermore, the tip of the fixing screw passes through the screw hole of the pressure plate and is screwed into the fifth threaded hole on the car body, thereby fixing the pressure plate to the car body; the screw head of the supporting screw contacts the end face of the car body close to the protruding cylinder, and the supporting screw is screwed into the fourth threaded hole of the pressure plate. A supporting nut is screwed into the end of the supporting screw passing through the pressure plate, and the supporting nut contacts the pressure plate, thereby fixing the supporting screw to the pressure plate, and supporting the pressure plate by the supporting screw.

[0015] The beneficial effects of the present invention compared to the prior art are as follows:

[0016] The utility model provides a high positioning precision lathe, wherein the positioning sleeve can be replaced at any time, thereby reducing tooling costs; the positioning sleeve can be completed on the lathe, thereby ensuring high concentricity with the machine tool; the inner hole of the positioning sleeve is matched according to the outer diameter of the rotor, thereby ensuring good consistency of positioning interference, ensuring zero positioning error, and convenient loading and unloading of parts, and the positioning sleeve is durable; the outer end of the positioning sleeve is opened, and a length of guide is machined inside to ensure easy loading of parts; the fixture is simple to machine, and high-precision processing can be achieved on ordinary equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 It is a front cross-sectional view of the workpiece after it is fixed;

[0019] Figure 2 It is a side view of the workpiece after it is fixed;

[0020] Figure 3 It is a front cross-sectional view of the car;

[0021] Figure 4 It is a side view of the starting nut;

[0022] Figure 5 is a front cross-sectional view of the pressure plate;

[0023] Figure 6 is a side view of the pressure plate;

[0024] Figure 7 It is a structural diagram of the pressing mechanism;

[0025] Among them, 1 is the lathe body, 2 is the protruding cylinder, 3 is the positioning hole, 4 is the first threaded hole, 5 is the second threaded hole, 6 is the transition step, 7 is the starting nut, 8 is the regular hexagonal through hole, 9 is the positioning sleeve, 10 is the pressed-in screw, 11 is the pressed-in flat washer, 12 is the screw head, 13 is the first external threaded section, 14 is the second external threaded section, 15 is the pressure plate, 16 is the screw through hole, 17 is the fourth threaded hole, 18 is the fifth threaded hole, 19 is the fixing screw, 20 is the support screw, and 21 is the support nut. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0027] like Figure 1 As shown in FIG. 7 , the utility model provides a vehicle tool with high positioning accuracy, including a vehicle body 1, a starting nut 7, a positioning sleeve 9, a pressing mechanism, and a clamping mechanism.

[0028] The lathe body 1 is a cylindrical structure. A protruding cylinder 2 is provided at the center of one end face of the lathe body 1. The outer diameter of the protruding cylinder 2 is smaller than that of the lathe body 1. A cylindrical positioning hole 3 is provided at the center of the end face of the protruding cylinder 2. A first threaded hole 4 is provided at the center of the inner bottom face of the positioning hole 3. The inner wall of the first threaded hole 4 is provided with an internal thread. A second threaded hole 5 is provided at the center of the inner bottom face of the first threaded hole 4. The second threaded hole 5 is connected to the end face of the lathe body 1 away from the protruding cylinder 2. The positioning hole 3, the first threaded hole 4, and the second threaded hole 5 are coaxially arranged. The inner diameter of the positioning hole 3 is larger than that of the first threaded hole 4, and the inner diameter of the first threaded hole 4 is larger than that of the second threaded hole 5. A cylindrical transition step 6 is provided at the center of the inner bottom face of the positioning hole 3. The inner diameter of the transition step 6 is between the inner diameters of the positioning hole 3 and the first threaded hole 4.

[0029] A starting nut 7 is threadedly connected to the interior of the first threaded hole 4. The starting nut 7 is a cylindrical structure with an external thread provided on the outer surface of the starting nut 7. A regular hexagonal through hole 8 with two ends extending therethrough is provided at the axis of the starting nut 7. The external thread on the outer side of the starting nut 7 is threadedly connected to the internal thread on the inner side of the first threaded hole 4. One end surface of the starting nut 7 contacts the inner bottom surface of the first threaded hole 4, and the other end surface of the starting nut 7 is flush with the inner bottom surface of the transition step 6.

[0030] A positioning sleeve 9 is inserted into the positioning hole 3. The positioning sleeve 9 is a cylindrical structure with two through ends. The outer cylindrical surface of the positioning sleeve 9 contacts the inner cylindrical surface of the positioning hole 3. The length of the positioning sleeve 9 is the same as the depth of the positioning hole 3. The inner end surface of the positioning sleeve 9 contacts the inner bottom surface of the positioning hole 3. The outer end surface of the positioning sleeve 9 is flush with the end surface of the protruding cylinder 2. A length guide is set inside the opening at the outer end of the positioning sleeve 9. The inner wall of the length guide maintains a clearance fit with the outer wall of the workpiece, so that the workpiece can smoothly enter the interior of the positioning sleeve 9 through the length guide. The remaining inner wall of the positioning sleeve 9, excluding the length guide, maintains an interference fit with the outer wall of the workpiece.

[0031] The pressing mechanism includes a pressing screw 10 and a pressing flat washer 11 .

[0032] A screw head 12 is fixedly mounted at one end of the press-in screw 10, with a hexagonal countersunk hole disposed on the end face of the screw head 12. A first externally threaded section 13 is disposed at the end of the press-in screw 10 away from the screw head 12, and a second externally threaded section 14 is disposed in the middle of the press-in screw 10. The outer diameter of the second externally threaded section 14 is larger than that of the first externally threaded section 13; the second externally threaded section 14 is spaced apart from both the first externally threaded section 13 and the screw head 12.

[0033] The pressed-in flat gasket 11 is a cylindrical plate-shaped structure. A third threaded hole with two ends passing through is provided at the axis of the pressed-in flat gasket 11. An internal thread is provided on the inner wall of the third threaded hole. The internal thread of the third threaded hole matches the external thread of the second external thread section 14.

[0034] The pressed flat washer 11 is sleeved on the outside of the pressed screw 10 between the screw head 12 and the second external thread segment 14. The inner diameter of the pressed flat washer 11 is larger than the outer diameter of the pressed screw 10 between the screw head 12 and the second external thread segment 14. The end face of one end of the pressed flat washer 11 contacts the screw head 12, and the other end of the pressed flat washer 11 maintains a distance from the second external thread segment 14.

[0035] There are two pressing mechanisms, which are symmetrically arranged on both sides of the end surface of the protruding cylinder 2. The positioning sleeve 9 is tightly pressed into the positioning hole 3 by the two pressing mechanisms.

[0036] Each clamping mechanism includes a pressing plate 15, a supporting screw 20, and a fixing screw 19. The pressing plate 15 is a square plate-shaped structure. The pressing plate 15 contacts the end face of the protruding cylinder 2. The pressing plate 15 is perpendicular to the axis of the car body 1. One end of the pressing plate 15 extends to the outer end opening of the positioning hole 3, and the other end of the pressing plate 15 extends to the outside of the protruding cylinder 2. A screw through hole 16 and a fourth threaded hole 17 are provided on the pressing plate 15. A fifth threaded hole 18 is provided on the end face of the car body 1 on one side close to the protruding cylinder 2, and the fifth threaded hole 18 corresponds to the screw through hole 16. After the tip of the fixing screw 19 passes through the screw through hole 16 of the pressing plate 15, it is screwed to the fifth threaded hole 18 on the car body 1, so that the pressing plate 15 is fixed to the car body 1. The screw head of the support screw 20 contacts the end face of one side of the vehicle body 1 close to the protruding cylinder 2, and the support screw 20 is screwed into the fourth threaded hole 17 of the pressure plate 15. A support nut 21 is screwed into one end of the support screw 20 passing through the pressure plate 15. The support nut 21 contacts the pressure plate 15, thereby fixing the support screw 20 to the pressure plate 15, and supporting the pressure plate 15 by the support screw 20.

[0037] The working principle of this utility model is:

[0038] Step 1: When the rotor needs to be processed, first screw the starting nut 7 into the first threaded hole 4 of the vehicle body 1 using an external hexagonal wrench to ensure that the inner end of the starting nut 7 is in close contact with the inner bottom surface of the first threaded hole 4.

[0039] Step 2: Insert the positioning sleeve 9 into the positioning hole 3 of the vehicle body 1 to ensure that the inner end of the positioning sleeve 9 is in close contact with the inner bottom surface of the positioning hole 3 .

[0040] Step 3: Insert one end of the workpiece into the length guide at one end outside the positioning sleeve 9.

[0041] Step 4: Insert the press screw 10 into the third threaded hole of the press washer 11. Thread the third threaded hole of the press washer 11 into the second externally threaded section 14 of the press screw 10, so that the press washer 11 passes through the second externally threaded section 14 and is then attached to the outside of the press screw 10 between the screw head 12 and the second externally threaded section 14. Pass one end of the first externally threaded section 13 of the press screw 10 through the workpiece and the starter nut 7, then threadably engage the second threaded hole 5 of the lathe body 1. At this point, the press washer 11 contacts the outer end of the workpiece. By rotating the press screw 10, the length of the first externally threaded section 13 threaded into the second threaded hole 5 gradually increases, and the press washer 11 gradually approaches the protruding cylinder 2 of the lathe body 1, gradually pressing the workpiece into the locating sleeve 9. When the inner end of the workpiece contacts the inner bottom surface of the locating hole 3, the workpiece is fully inserted into the locating sleeve 9, and rotation of the press screw 10 is stopped.

[0042] Step 5: Place the two pressure plates 15 on either side of the outer end of the workpiece, so that the inner sides of the two pressure plates 15 are in contact with the workpiece. A support screw 20 is screwed into the fourth threaded hole 17 of each pressure plate 15. By rotating the support screw 20, the screw head of the support screw 20 contacts the end face of the lathe body 1 near the protruding cylinder 2. Then, a support nut 21 is screwed onto the end of the support screw 20 that passes through the pressure plate 15. The support nut 21 contacts the pressure plate 15, securing the support screw 20 to the pressure plate 15. The support screw 20 supports the outer end of the pressure plate 15, ensuring that the pressure plate 15 is perpendicular to the axis of the lathe body 1. Then, a fixing screw 19 is inserted into the screw hole 16 of the pressure plate 15. The fixing screw 19 passes through the pressure plate 15 and screws into the fifth threaded hole 18 of the lathe body 1, thereby securing the pressure plate 15 to the lathe body 1. The pressure plates 15 on both sides limit the outer end of the workpiece.

[0043] Step 6: After the workpiece is fixed on the lathe body 1, the interior of the workpiece can be processed.

[0044] Step 7: After the workpiece is processed, loosen the fixing screws 19 on both sides. At this time, the pressure plates 15 on both sides can be rotated. Rotate the pressure plates 15 on both sides so that the edges of the pressure plates 15 are tightly pressed against the positioning sleeve 9 instead of the workpiece. Then tighten the fixing screws 19 again to fix the pressure plates 15. Then insert the hexagonal through hole 8 of the starting nut 7. By turning the hexagonal wrench, unscrew the starting nut 7 from the first threaded hole 4 of the car body 1. During the unscrewing process, the starting nut 7 drives the workpiece out of the positioning sleeve 9. When the starting nut 7 is removed from the first threaded hole 4, the processed workpiece is also removed from the positioning sleeve 9.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A vehicle with high positioning accuracy, characterized in that: The invention comprises a lathe body (1), a starting nut (7), a positioning sleeve (9), a pressing mechanism and a clamping mechanism; the lathe body (1) is a cylindrical structure, a protruding cylinder (2) is arranged at the center of the end surface of one end of the lathe body (1), a cylindrical positioning hole (3) is arranged at the center of the end surface of the protruding cylinder (2); a first threaded hole (4) is arranged at the center of the inner bottom surface of the positioning hole (3), a second threaded hole (5) is arranged at the center of the inner bottom surface of the first threaded hole (4), and a threaded hole (6) is screwed inside the first threaded hole (4). A starting nut (7) is provided with a positioning sleeve (9) inserted into the positioning hole (3); the pressing mechanism comprises a pressing screw (10) and a pressing flat washer (11), the pressing flat washer (11) is sleeved on the outside of the pressing screw (10), one end of the pressing screw (10) is provided with a first external thread section (13), and the first external thread section (13) is matched with the second threaded hole (5); a clamping mechanism is provided on both sides of the end surface of the protruding cylinder (2), and the positioning sleeve (9) is tightly pressed into the positioning hole (3) by the two clamping mechanisms.

2. A high positioning accuracy vehicle tool according to claim 1, characterized in that: The outer diameter of the protruding cylinder (2) is smaller than the outer diameter of the vehicle body (1).

3. The high positioning accuracy vehicle tool according to claim 1, characterized in that: The second threaded hole (5) is in communication with an end surface of the vehicle body (1) on one side away from the protruding cylindrical section (2).

4. The high positioning accuracy vehicle tool according to claim 1, characterized in that: The positioning hole (3), the first threaded hole (4), and the second threaded hole (5) are coaxially arranged, and the inner diameter of the positioning hole (3) is larger than the inner diameter of the first threaded hole (4), and the inner diameter of the first threaded hole (4) is larger than the inner diameter of the second threaded hole (5); a cylindrical transition step (6) is arranged at the center of the inner bottom surface of the positioning hole (3), and the inner diameter of the transition step (6) is located between the inner diameters of the positioning hole (3) and the first threaded hole (4).

5. A high positioning accuracy vehicle tool according to claim 4, characterized in that: The starting nut (7) is a cylindrical structure, with an external thread provided on the outer surface of the starting nut (7), and a regular hexagonal through hole (8) with two ends passing through is provided at the axis of the starting nut (7), and the external thread on the outer side of the starting nut (7) is threadedly connected with the internal thread on the inner side of the first threaded hole (4); one end surface of the starting nut (7) contacts the inner bottom surface of the first threaded hole (4), and the other end surface of the starting nut (7) is flush with the inner bottom surface of the transition step (6).

6. The high positioning accuracy vehicle tool according to claim 1, characterized in that: The positioning sleeve (9) is a cylindrical structure with two ends connected, the outer cylindrical surface of the positioning sleeve (9) contacts the inner cylindrical surface of the positioning hole (3), the length of the positioning sleeve (9) is the same as the depth of the positioning hole (3), the inner end surface of the positioning sleeve (9) contacts the inner bottom surface of the positioning hole (3), and the outer end surface of the positioning sleeve (9) is flush with the end surface of the protruding cylinder (2).

7. A high positioning accuracy vehicle tool according to claim 6, characterized in that: A length guide is arranged inside the opening at one end of the outer side of the positioning sleeve (9), the inner wall of the length guide maintains a clearance fit with the outer wall of the workpiece, and the remaining inner wall of the positioning sleeve (9) excluding the length guide maintains an interference fit with the outer wall of the workpiece.

8. The high positioning accuracy vehicle tool according to claim 1, characterized in that: A screw head (12) is fixedly provided at one end of the press-in screw (10) away from the first external thread section (13), and a hexagonal countersunk hole is provided on the end surface of the screw head (12); a second external thread section (14) is provided in the middle of the press-in screw (10), and the outer diameter of the second external thread section (14) is greater than the outer diameter of the first external thread section (13); the press-in flat washer (11) is a cylindrical plate-like structure, and a third threaded hole with two ends passing through is provided at the axis of the press-in flat washer (11), and a hexagonal countersunk hole is provided on the inner wall of the third threaded hole. The invention discloses a press-fit flat washer (11) having an internal thread, wherein the internal thread of the third threaded hole matches the external thread of the second external thread section (14); the press-fit flat washer (11) is sleeved on the outside of the press-fit screw (10) between the screw head (12) and the second external thread section (14); the internal diameter of the press-fit flat washer (11) is larger than the external diameter of the press-fit screw (10) between the screw head (12) and the second external thread section (14); the end surface of one end of the press-fit flat washer (11) contacts the screw head (12); and the other end of the press-fit flat washer (11) maintains a distance from the second external thread section (14).

9. The high positioning accuracy vehicle tool according to claim 1, characterized in that: Each clamping mechanism comprises a pressing plate (15), a supporting screw (20), and a fixing screw (19); the pressing plate (15) is a square plate-shaped structure, the pressing plate (15) contacts the end face of the protruding cylinder (2), and the pressing plate (15) is perpendicular to the axis of the vehicle body (1); one end of the pressing plate (15) extends to the outer end opening of the positioning hole (3), and the other end of the pressing plate (15) extends to the outer side of the protruding cylinder (2); a screw through hole (16) and a fourth threaded hole (17) are provided on the pressing plate (15); a fifth threaded hole (18) is provided on the end face of one side of the vehicle body (1) close to the protruding cylinder (2), and the fifth threaded hole (18) corresponds to the screw through hole (16).

10. A high positioning accuracy vehicle tool according to claim 9, characterized in that: After the tip of the fixing screw (19) passes through the screw through hole (16) of the pressure plate (15), it is screwed into the fifth threaded hole (18) on the vehicle body (1), thereby fixing the pressure plate (15) on the vehicle body (1); the screw head of the supporting screw (20) contacts the end face of one side of the vehicle body (1) close to the protruding cylinder (2), the supporting screw (20) is screwed into the fourth threaded hole (17) of the pressure plate (15), and a supporting nut (21) is screwed into one end of the supporting screw (20) passing through the pressure plate (15), and the supporting nut (21) contacts the pressure plate (15), thereby fixing the supporting screw (20) and the pressure plate (15), and supporting the pressure plate (15) through the supporting screw (20).

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