CN112536750B - Gear pin press-fit clamp - Google Patents
Gear pin press-fit clamp Download PDFInfo
- Publication number
- CN112536750B CN112536750B CN202011182695.1A CN202011182695A CN112536750B CN 112536750 B CN112536750 B CN 112536750B CN 202011182695 A CN202011182695 A CN 202011182695A CN 112536750 B CN112536750 B CN 112536750B
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- pin
- gear
- positioning
- pressure head
- machined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
- B25B11/02—Assembly jigs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention discloses a gear pin press-fit clamp which comprises a bottom plate, wherein a positioning shaft for bearing and axially positioning a gear to be machined is arranged on the bottom plate, a tooth groove positioning mechanism for positioning the gear to be machined is arranged on the side wall of the bottom plate, and a positioning reference surface of the tooth groove positioning mechanism is coplanar with a positioning surface of the positioning shaft; the device also comprises a pressing device arranged on the machine tool. The device of the invention not only improves the positioning precision of the pin, but also solves the problems of skew placement and inconvenient placement. And aligning the calibration pressure head with the calibration bushing before press-fitting so that the pressure head on the press machine is aligned with the gear pin hole. After the working pressure head is replaced, the pin is placed into the positioning hole in the working pressure head; mounting the gear on the base, aligning the position of the mark, and inserting a positioning pin; and starting the machine tool to press the head to a limiting position. Therefore, the positions of the pin and the central line of the tooth groove of the B reference surface can be ensured, and the depth of the pin pressed into the gear can also be ensured.
Description
Technical Field
The invention belongs to the technical field of assembly fixtures, and particularly relates to a gear pin press-fit fixture.
Background
In the gear shown in fig. 1, the pin hole has a strict phase requirement with respect to the reference of the helical gear B, and the pin has a strict requirement for the depth of the pin to be exposed from the gear end face or to be pressed into the gear pin hole. If the clamp cannot accurately align the position of the pressure head or the pin, the product is easy to be unqualified. In the conventional press-fit fixture, a pin guiding device is arranged on the end face of a gear, a pin needs to be placed in a guiding mechanism during assembly, and the pin is easily extruded or pressed and deformed during press fitting due to the gap between the pin and a guiding hole.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a gear pin press-fit clamp which is accurate in positioning and convenient to use.
In order to achieve the purpose, the gear pin press-fit clamp comprises a bottom plate and is characterized in that:
the bottom plate is provided with a positioning shaft for bearing and axially positioning a gear to be machined, the side wall of the bottom plate is provided with a tooth groove positioning mechanism for positioning the gear to be machined, and a positioning reference surface of the tooth groove positioning mechanism is coplanar with a positioning surface of the positioning shaft;
the clamping device comprises a limiting sleeve for mounting the pin, and the limiting sleeve is coaxially provided with a stepped hole; one end of the pressure head is a stepped shaft matched with the stepped hole and inserted into the stepped hole, and the other end of the pressure head is connected with a machine tool; a spring is arranged between the interface of the stepped shaft and the interface of the stepped hole, and the spring is sleeved on the pressure head; the outer wall of the pressure head above the spring is provided with an axial arrangement limiting groove, and one end of a limiting screw extends into the limiting groove from the limiting sleeve.
In order to further improve the accuracy of the clamp, the clamp further preferably comprises a calibration device, wherein the calibration device comprises a calibration bushing arranged on the positioning shaft and a calibration pressure head detachably connected with the machine tool; the calibration bushing is provided with a taper hole, and one end of the calibration pressure head is provided with a conical surface matched with the taper hole; the end face of the calibration bushing is coplanar with the positioning face of the positioning shaft.
Further preferably, the taper hole is coaxial with a pin hole of the gear to be machined.
Preferably, the gear machining device further comprises a cover plate, wherein the cover plate is connected with the positioning shaft through a bolt, and the gear to be machined is clamped between the cover plate and the positioning surface of the positioning shaft.
Preferably, the tooth space positioning mechanism comprises a pin seat arranged on the side wall of the bottom plate, and a floating pin sleeved on the pin seat and inserted for replacing a gear tooth space to be processed; the axis of the floating pin and the positioning surface of the positioning shaft are on the same plane.
Preferably, the floating pin comprises a pin seat bushing connected with the side wall of the pin seat, a floating pin body which passes through the pin seat bushing and the pin seat and can be inserted into the tooth grooves of the gear to be machined, and a return spring which is sleeved on the floating pin body and is positioned in the pin seat; one end of the return spring is abutted against the pin base bushing, and the other end of the return spring is abutted against the bottom of the pin base hole.
Still further preferably, the floating pin body is provided with a step, and one end of the return spring abuts against the step. In this way, the axial displacement travel of the floating pin can be limited by the step.
Still further preferably, a cross groove is formed in the end face of the pin boss bushing, and a cylindrical pin capable of being accommodated in the cross groove is arranged on the floating pin body; the distance from one straight groove of the cross grooves to the tooth socket of the gear to be machined is larger than the distance from the cylindrical pin to the end part of the floating pin body is larger than the distance from the other straight groove of the cross grooves to the tooth socket of the gear to be machined.
In order to conveniently adjust the position of the clamp, as another preferable scheme, the clamp further comprises a pressing plate; one end of the pressure plate is in compression joint with the bottom plate, and the other end of the pressure plate is borne on the working surface of the machine tool through a supporting screw; the middle part of the pressing plate is provided with a waist-shaped groove, and the fastening bolt penetrates through the working surface of the machine tool and the waist-shaped groove to fix the pressing plate.
The invention has the beneficial effects that: the device of the invention not only improves the positioning precision of the pin, but also solves the problems of inclined placement and inconvenient placement. And aligning the calibration pressure head with the calibration bushing before press-fitting so that the pressure head on the press machine is aligned with the gear pin hole. After the working pressure head is replaced, the pin is placed into the positioning hole on the working pressure head; mounting the gear on the base, aligning the position of the mark, and inserting a positioning pin; and starting the machine tool to press the head to a limiting position. Therefore, the positions of the pin and the center line of the tooth groove of the B reference surface can be ensured, and the depth of the pin pressed into the gear can also be ensured.
Drawings
FIG. 1 is a schematic view of a gear for machining;
FIG. 2 is a schematic front view of the present invention with the hold-down device and fastening bolts hidden;
FIG. 3 is a schematic view of the A-A rotational cross section of FIG. 2;
FIG. 4 is a schematic diagram of the calibration device of the present invention.
In the figure: the device comprises a bottom plate 1, a pressure plate 2, a supporting screw 3, a fastening bolt through 4, a gear 5 to be processed, a positioning shaft 6, a cover plate 7, a pin 8, a limiting sleeve 9, a pressure head 10, a spring 11, a limiting screw 12, a pin base 13, a pin base bush 14, a floating pin body 15, a return spring 16, a cylindrical pin 17, a calibration bush 18 and a calibration pressure head 19; wherein: the positioning surface 6.1, the limiting groove 10.1, the cross groove 14.1 and the step 15.1.
Detailed Description
The technical solutions (including the preferred technical solutions) of the present invention are further described in detail by means of fig. 2 to 4 and a way of listing some alternative embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of protection of the present invention.
As shown in figures 2 and 3, the gear pin press-fit clamp comprises a bottom plate 1, a pressing plate 2, a pressing device, a calibrating device and a tooth groove positioning mechanism.
One end of the pressure plate 2 is pressed on the bottom plate 1, and the other end of the pressure plate is borne on the working surface of the machine tool through a support screw 3; the middle part of the pressing plate 2 is provided with a waist-shaped groove, and a fastening bolt penetrates through the machine tool working surface and the waist-shaped groove 4 to fix the pressing plate 2. Thus, the clamp is fixed on the machine tool, and a mounting base of other parts is provided. The bottom plate 1 is provided with a positioning shaft 6 for bearing and axially positioning the gear 5 to be machined, the side wall of the bottom plate 1 is provided with a tooth socket positioning mechanism for positioning the gear 5 to be machined, and a positioning reference surface of the tooth socket positioning mechanism is coplanar with a positioning surface 6.1 of the positioning shaft 6; and B reference and A reference of the gear 5 to be machined are positioned through the excircle and the end surface of the upper part of the positioning shaft 6. And the substitute machining gear 6 is clamped through a cover plate 7 and a bolt.
The pressing device comprises a limiting sleeve 9 provided with a pin 8, and the limiting sleeve 9 is coaxially provided with a stepped hole; one end of the pressure head 10 is a stepped shaft matched with the stepped hole and inserted into the stepped hole, and the other end of the pressure head is connected with a machine tool; a spring 11 is arranged between the interface of the stepped shaft and the interface of the stepped hole, and the spring 11 is sleeved on the pressure head 10; the outer wall of the pressure head above the spring 11 is provided with an axially arranged limiting groove 10.1, and one end of a limiting screw 12 extends into the limiting groove 10.1 from the limiting sleeve 9.
The tooth space positioning mechanism comprises a pin seat 13 arranged on the side wall of the bottom plate 1, a floating pin sleeved on the pin seat 13 and inserted for replacing a tooth space of the processing gear 5; the axis of the floating pin and the positioning surface 6.1 of the positioning shaft 6 are on the same plane. The floating pin comprises a pin seat bush 14 connected with the side wall of the pin seat 13, a floating pin body 15 which passes through the pin seat bush 14 and the pin seat 13 and can be inserted into the tooth groove of the gear 5 to be machined, and a return spring 16 which is sleeved on the floating pin body 15 and is positioned in the pin seat 13; the return spring 16 has one end abutting against the pin holder bush 14 and the other end abutting against the bottom of the pin holder hole. The floating pin body 15 is provided with a step 15.1, and one end of the return spring 16 abuts against the step 15.1. In this way, the axial displacement travel of the floating pin can be limited by the step. The end face of the pin boss bushing 14 is provided with a cross groove 14.1, and the floating pin body 15 is provided with a cylindrical pin 17 which can be accommodated in the cross groove 14.1; the distance from one straight groove of the cross grooves 14.1 to the tooth space of the gear 5 to be machined is larger than the distance from the cylindrical pin 17 to the end part of the floating pin body 15 is larger than the distance from the other straight groove of the cross grooves 14.1 to the tooth space of the gear 5 to be machined.
The cogging positioning mechanism positions the cogging center line of the reference plane of the gear by the return spring 116, the pin boss 13, the floating pin body 15, and the pin boss bush 14.
As shown in fig. 4, in order to further improve the accuracy of the fixture, it is preferable to further include a calibration device, which includes a calibration bushing 18 provided on the positioning shaft 6 and a calibration ram 19 detachably connected to the machine tool; the calibration bushing 18 is provided with a taper hole, and one end of the calibration pressure head 19 is provided with a conical surface matched with the taper hole; the end face of the alignment bushing 18 is coplanar with the positioning face 6.1 of the positioning shaft 6.
Preferably, the taper hole is coaxial with a pin hole of the machining gear 5.
The calibration ram 19 is capable of aligning the position of the ram 10 with the alignment holes of the fixture. So that the pin hole of the machining-substituted gear 5 is coaxial with the machine tool pressure head. Thereby ensuring that the pin can be accurately pressed into the pin hole required to be pressed in.
The use steps are as follows:
1. the jig is mounted on the press and the position of the calibration bushing is adjusted to substantially align the machine ram.
2. The calibration indenter is mounted to the spindle of the press. And coating pigment on the conical surface of the calibration indenter.
3. And pressing down the calibration pressure head, and adjusting the clamp to ensure that the pigment on the conical surface of the calibration bushing is uniformly covered.
4. And (5) fastening the pressing plate so that the clamp is fixed.
5. The floating pin is loosened.
6. And (4) enabling an inner hole of the gear to be machined to penetrate through the positioning shaft, and attaching the reference surface to the end face of the positioning shaft.
7. And inserting the floating pin into the correct gear tooth groove according to the mark of the gear end face.
8. And (4) placing the cover plate on the upper end surface of the gear to be machined, and screwing down the screw.
9. And (5) unloading the calibration pressure head.
10. The hold-down device is mounted on the press spindle.
11. The pin is inserted into the hole of the limiting sleeve. Correcting the radial run-out of the pin.
12. And pressing down the pressing device to ensure that the end face of the lower end face of the limiting sleeve is attached to the end face of the gear to be machined, and the end face of the pressure head is attached to the end face of the limiting sleeve.
The depth of the pin pressed in is ensured through the height difference between the end face of the pressure head and the end face of the limiting sleeve after the pressure head and the end face of the limiting sleeve are compressed tightly during compression.
It should be understood by those skilled in the art that the above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, and any modification, combination, replacement, improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a gear pin press-fit clamp, includes the bottom plate, its characterized in that: the bottom plate is provided with a positioning shaft for bearing and axially positioning a gear to be machined, the side wall of the bottom plate is provided with a tooth groove positioning mechanism for positioning the gear to be machined, and a positioning reference surface of the tooth groove positioning mechanism is coplanar with a positioning surface of the positioning shaft;
the clamping device comprises a limiting sleeve for mounting the pin, and the limiting sleeve is coaxially provided with a stepped hole; one end of the pressure head is a stepped shaft matched with the stepped hole and inserted into the stepped hole, and the other end of the pressure head is connected with a machine tool; a spring is arranged between the interface of the stepped shaft and the interface of the stepped hole, and the spring is sleeved on the pressure head; the outer wall of the pressure head above the spring is provided with an axially arranged limiting groove, and one end of a limiting screw extends into the limiting groove from the limiting sleeve;
the calibration device comprises a calibration bushing arranged on the positioning shaft and a calibration pressure head detachably connected with the machine tool; the calibration bushing is provided with a taper hole, and one end of the calibration pressure head is provided with a conical surface matched with the taper hole; the end surface of the calibration bushing is coplanar with the positioning surface of the positioning shaft; the taper hole is coaxial with a pin hole of the gear to be machined;
the tooth socket positioning mechanism comprises a pin socket arranged on the side wall of the bottom plate, and a floating pin which is sleeved on the pin socket and is inserted into a tooth socket of the gear to be processed; the axis of the floating pin and the positioning surface of the positioning shaft are on the same plane.
2. The gear pin press-fit jig according to claim 1, wherein: the gear machining device is characterized by further comprising a cover plate, wherein the cover plate is connected with the positioning shaft through a bolt, and the gear to be machined is clamped between the cover plate and the positioning surface of the positioning shaft.
3. The gear pin press-fit jig of claim 1, wherein: the floating pin comprises a pin boss bushing connected with the side wall of the pin boss, a floating pin body which penetrates through the pin boss bushing and the pin boss and can be inserted into a tooth groove of the gear to be processed, and a return spring which is sleeved on the floating pin body and is positioned in the pin boss; one end of the return spring is abutted against the pin base bushing, and the other end of the return spring is abutted against the bottom of the pin base hole.
4. The gear pin press-fit jig of claim 1, wherein: the floating pin body is provided with a step, and one end of the return spring is abutted against the step.
5. The gear pin press-fit jig of claim 3, wherein: the end face of the pin boss bushing is provided with a cross groove, and the floating pin body is provided with a cylindrical pin which can be accommodated in the cross groove; the distance from one straight groove of the cross grooves to the tooth socket of the gear to be machined is larger than the distance from the cylindrical pin to the end part of the floating pin body is larger than the distance from the other straight groove of the cross grooves to the tooth socket of the gear to be machined.
6. The gear pin press-fit jig according to claim 1, wherein: the device also comprises a pressing plate; one end of the pressure plate is in compression joint with the bottom plate, and the other end of the pressure plate is borne on the working surface of the machine tool through a support screw; a waist-shaped groove is formed in the middle of the pressing plate, and the fastening bolt penetrates through the working surface of the machine tool and the waist-shaped groove to fix the pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011182695.1A CN112536750B (en) | 2020-10-29 | 2020-10-29 | Gear pin press-fit clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011182695.1A CN112536750B (en) | 2020-10-29 | 2020-10-29 | Gear pin press-fit clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112536750A CN112536750A (en) | 2021-03-23 |
| CN112536750B true CN112536750B (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011182695.1A Active CN112536750B (en) | 2020-10-29 | 2020-10-29 | Gear pin press-fit clamp |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462213B (en) * | 2008-12-26 | 2011-01-12 | 天津重钢机械装备股份有限公司 | Pin type positioning clamping fixture and method for numerical control cutting machine second cutting workpiece |
| US10766107B2 (en) * | 2017-10-31 | 2020-09-08 | Honda Motor Co., Ltd. | Transmission shaft disassembly press fixture |
| CN209021508U (en) * | 2018-09-21 | 2019-06-25 | 万向钱潮股份有限公司 | A kind of welding robot and soldering cramping apparatus self-checking device |
| CN209599057U (en) * | 2018-11-26 | 2019-11-08 | 东风汽车有限公司 | Double-stage cone pulley interference hot-charging clamp in engine gear train |
| CN109866004A (en) * | 2019-03-22 | 2019-06-11 | 重庆青山工业有限责任公司 | Assemble the press mounting tool of elastic cylindrical pin |
| CN210388205U (en) * | 2019-09-04 | 2020-04-24 | 丹鸟机电(苏州)有限公司 | Device for preventing connecting rod cylindric lock gnaws limit |
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| CN112536750A (en) | 2021-03-23 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20211116 Address after: 442002 No. 138, Checheng West Road, Zhangwan District, Shiyan City, Hubei Province Applicant after: Dongfeng auto parts (Group) Co.,Ltd. blade measuring tool branch Address before: 430056 No. 10, Dongfeng Avenue, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Applicant before: DONGFENG MOTER Co.,Ltd. |
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