CN218136403U

CN218136403U - Clamping and milling fixture for cycloidal gear of RV reducer

Info

Publication number: CN218136403U
Application number: CN202221408671.8U
Authority: CN
Inventors: 黄展林
Original assignee: Shanghai Yigong Precision Technology Co ltd
Current assignee: Shanghai Yigong Precision Technology Co ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2022-12-27
Anticipated expiration: 2032-06-07

Abstract

The utility model relates to a clamping and milling fixture for a cycloidal gear of an RV reducer, which comprises a processing seat, a pressing plate, a gasket and a limit screw; the processing seat comprises a base and a processing table, a central shaft is arranged on the processing table, the outer diameter of the central shaft is matched with the inner circle diameter of the cycloidal gear to be processed, a threaded hole matched with a limit screw is formed in the central shaft, a pressing plate and a gasket are sleeved on the limit screw, a central hole of the cycloidal gear to be processed is sleeved on the central shaft, and the cycloidal gear to be processed is fixed on the processing table through the pressing plate, the gasket and the limit screw. Compared with the prior art, the utility model discloses a processing at vertical machining center of cycloid wheel can be accomplished to a clamping, has guaranteed the machining precision, has reduced the clamping time, has improved production efficiency.

Description

Clamping and milling fixture for cycloidal gear of RV reducer

Technical Field

The utility model belongs to the technical field of the RV reduction gear technique and specifically relates to a clamping milling fixture of RV reduction gear cycloid wheel is related to.

Background

The RV reducer is a novel transmission device which applies a planetary transmission principle and adopts cycloid pin gear engagement, is used as a key component in the reducer, has processing precision closely related to the quality and the service life of the reducer, and comprises a pin gear shell, a planet carrier, three crank shafts, a cycloid wheel, three pairs of taper needle bearings and the like which are arranged between the crank shafts and the planet carrier, wherein the cycloid wheel is an important component of the RV reducer.

In the prior art, the inner circle and the outer circle of a blank forged piece of the cycloid wheel are machined through a lathe, the inner circle and the outer circle are machined out in a follow-up circulation mode to a vertical machining center, and the tooth profile, the bearing hole and the avoiding hole are machined out through the vertical machining center. And after the workpiece tooth profile and the bearing hole are fired, respectively processing the workpiece tooth profile and the bearing hole to the size of a finished product through a gear grinding machine and a coordinate grinder. It can be understood that in the machining process of a historical machining center, the clamping is undoubtedly carried out again, the precision of the cycloid wheel is influenced, and in order to guarantee a phase angle between a tooth form and a bearing hole, the best machining mode is that the external tooth and the bearing hole are machined through one-time clamping. However, at present, no proper clamping and milling clamp is available for completing all machining operations of the vertical machining center by one-time clamping.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a clamping milling fixture of RV reduction gear cycloid wheel in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

a once clamping and milling clamp for a cycloidal gear of an RV reducer comprises a processing seat, a pressing plate, a gasket and a limiting screw;

the processing seat comprises a base and a processing table, wherein a central shaft is arranged on the processing table, the outer diameter of the central shaft is matched with the inner circle diameter of the cycloidal gear to be processed, a threaded hole matched with a limit screw is formed in the central shaft, a pressing plate and a gasket are sleeved on the limit screw, the central hole of the cycloidal gear to be processed is sleeved on the central shaft, and the cycloidal gear to be processed is fixed on the processing table through the pressing plate, the gasket and the limit screw.

Preferably, the base is provided with a fixing part for fixing the processing seat.

Preferably, the fixing part is a U-shaped groove formed in two ends of the base, and the U-shaped groove is matched with a T-shaped groove of a machine tool.

Preferably, the gap between the central shaft and the central hole of the cycloidal gear is 0-0.02 mm.

Preferably, the processing platform is of a cylindrical structure, the top surface of the processing platform is provided with a blanking hole, the side surface of the processing platform is provided with a side surface hole, the side surface hole is communicated with the blanking hole, and the top end of the central shaft extends out of the top surface of the processing platform.

Preferably, the blanking holes are a plurality of vertical holes, the vertical holes are uniformly distributed outside the central shaft along the circumferential direction, and the side holes are communicated with the vertical holes in a one-to-one correspondence manner.

Preferably, the number of the vertical holes is 3.

Preferably, at the top end of the processing table, the side surface is higher than the top surface, an avoiding space is formed between the top surface and the side surface higher than the top surface, and when the cycloid wheel to be processed is fixed on the processing table, a space exists between the top surface of the processing table and the bottom surface of the cycloid wheel.

Preferably, the gasket is an open gasket, and the inner diameter of the pressure plate is larger than the outer diameter of the limit screw.

The processing table and the base are integrally formed.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) The processing of the cycloid wheel at the vertical processing center can be completed by one-time clamping, the processing precision is ensured, the clamping time is reduced, and the production efficiency is improved.

(2) The base is equipped with the fixed part, guarantees that the processing seat position is stable unchangeable in the course of working, and follow-up need not look for again, promotes machining efficiency.

(3) The diameter of the central shaft is matched with the inner circle of the cycloid wheel, and a workpiece of the cycloid wheel can be easily placed on the tool without shaking.

(4) The design of blanking hole and side hole can guarantee that iron fillings discharge along with the cutting fluid in the course of working.

(5) An avoidance space is designed, and 1, the design of the avoidance space enables a space to exist between the top surface of the processing table and the bottom surface of the cycloid wheel, so that iron scraps can fall and be discharged conveniently in the processing process, and the condition that the iron scraps are cut is avoided; 2. during roughing, a U-shaped drill is used for roughing and removing, so that the lower cutter space is not contacted with the tool; 3. and after the bearing hole and the avoidance hole are processed, a reverse side orifice chamfer can be performed by using a reverse side chamfer cutter, so that the one-time assembly and machining time is reduced.

(6) The gasket is an opening gasket, and the inner diameter of the pressure plate is larger than the outer diameter of the limiting screw. Therefore, when the workpiece is replaced, the limiting screw is only required to be loosened to take out the U-shaped opening gasket, the pressing plate and the workpiece can be easily taken out, the limiting screw does not need to be completely unscrewed to be taken out, and the replacement and assembly time is reduced.

Drawings

Fig. 1 is a schematic structural view of the present invention and a cycloid wheel to be processed;

FIG. 2 is a schematic structural view of a machining seat;

FIG. 3 is a schematic cross-sectional view of the cycloid wheel to be machined after being fixed to the machining table;

reference numerals: 1. the base, 2, processing platform, 3, center pin, 4, cycloid wheel, 5, clamp plate, 6, opening gasket, 7, stop screw, 8, U type groove, 9, perpendicular hole, 10, side hole, 11, dodge the space.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. Parts are exaggerated in the drawing where appropriate for clarity of illustration.

Example 1:

a milling fixture for once clamping of a cycloidal gear of an RV reducer, which is hereinafter referred to as a tool for short, as shown in figures 1 to 3, comprises a processing seat, a pressing plate 5, a gasket and a limit screw 7;

wherein, the processing seat includes base 1 and processing platform 2, processing platform 2 and base 1 integrated into one piece, be equipped with center pin 3 on the processing platform 2, the external diameter of center pin 3 and the diameter (the centre bore of cycloid wheel 4 promptly) adaptation of the interior circle of the cycloid wheel 4 of treating processing, be equipped with the screw hole with stop screw 7 matched with in the center pin 3, clamp plate 5 and gasket cover are established on stop screw 7, the centre bore cover of the cycloid wheel 4 of treating processing is established on center pin 3, be fixed in on the processing platform 2 through clamp plate 5, gasket and stop screw 7.

The utility model discloses an operation description as follows:

the machining seat is fixed on a machine tool, a central hole of a cycloidal gear 4 (hereinafter referred to as a workpiece) to be machined is sleeved on a central shaft 3, a pressing plate 5 is placed on the cycloidal gear 4, a limit screw 7 penetrates through a gasket and the pressing plate 5 and is screwed in a threaded hole of the central shaft 3 to tightly press the cycloidal gear workpiece 4, then the tooth profile, the bearing hole and the avoiding hole are machined, after the machining is finished, the limit screw 7 is loosened, and the machined cycloidal gear 4 is taken out.

The limit screw 7, the central shaft 3, and the pressing plate 5 and the spacer can fix the cycloid wheel workpiece 4 to the processing table 2. When the inner bearing hole and the avoidance hole of the workpiece are machined, the self-rotation axial movement of the U-shaped drill, the boring cutter and other cutters is mostly used for feeding in the machining process, and therefore the radial cutting force generated by the cutters is small in the machining process. And the workpiece processing area is closer to the central pressing area, so that the workpiece basically cannot rotate. However, in some implementation scenarios, during the milling of the external tooth form, the milling tool may apply a large cutting force to the outer circle of the workpiece. In order to avoid the rotation of the workpiece in the machining process, a positioning hole (coaxial with the workpiece bearing hole or the avoidance hole) can be formed in the machining table 2, and after the inner hole of the workpiece is machined, a positioning pin is inserted to perform angular limiting on the workpiece, so that the rotation of the cycloid wheel 4 around the central axis can be avoided.

The utility model has the advantages as follows:

(1) Be equipped with the fixed part on base 1 for fixed processing seat, the fixed part is for setting up the T type groove adaptation of 8,U type groove 8 and lathe at the U type groove 8,U both ends of base 1 in this embodiment, conveniently fixes the processing seat to lathe T type groove through the bolt on, can guarantee after the locking that the processing seat does not have the not hard up condition in the course of working. When the machine tool is firstly machined, after the machine tool is centered through the central shaft 3 to determine coordinates, the position of the machining seat is not changed, centering is not needed to be carried out again in the process of subsequently replacing the cycloid wheel workpiece 4 to be machined, and only the workpiece is replaced and then the machining program is started.

(2) The diameter of the central shaft 3 is in accordance with the size of the inner circle of the cycloidal gear 4 processed by a lathe, the gap is ensured to be between 0 and 0.02mm, and the cycloidal gear workpiece 4 can be easily placed on a tool without shaking.

(3) The processing table 2 is of a cylindrical structure, a blanking hole is formed in the top surface of the processing table, a side hole 10 is formed in the side surface of the processing table, the side hole 10 is communicated with the blanking hole, the top end of the central shaft 3 extends out of the top surface of the processing table 2, and iron scraps can be discharged along with cutting fluid in the processing process.

In this embodiment, the blanking holes are 3 vertical holes 9, the vertical holes 9 are uniformly distributed outside the central shaft 3 along the circumferential direction, the side holes 10 are communicated with the vertical holes 9 in a one-to-one correspondence manner, and of course, the number of the vertical holes 9 can be changed according to the size and actual needs of the vertical holes 9. In addition, blanking holes with other structures can be designed, such as circular blanking holes, a plurality of side holes 10 communicated with the blanking holes, and the like.

(4) At the top end of the machining table 2, the side surface is higher than the top surface, a barrel-shaped avoiding space 11 is formed between the top surface and the side surface higher than the top surface, and when the cycloid wheel 4 to be machined is fixed on the machining table 2, a space exists between the top surface of the machining table 2 and the bottom surface of the cycloid wheel 4.

Considering a cutter used in the processing process of a vertical processing center, a sufficient avoidance space 11 is designed mainly for the following points: 1. the design of the avoiding space 11 ensures that a space exists between the top surface of the processing table 2 and the bottom surface of the cycloid wheel 4, so that iron scraps can fall and be discharged conveniently in the processing process, and the condition that the iron scraps are broken is avoided; 2. during roughing, a U-shaped drill is used for roughing and removing, so that the lower cutter space is not contacted with the tool; 3. and after the bearing hole and the avoidance hole are processed, a reverse side orifice chamfer can be performed by using a reverse side chamfer cutter, so that the one-time assembly and machining time is reduced.

(5) The gasket is an opening gasket 6, and the inner diameter of the pressure plate 5 is larger than the outer diameter of the limiting screw 7. When the workpiece is replaced, the limiting screw 7 only needs to be loosened, the U-shaped opening gasket 6 is taken out, the pressing plate 5 and the workpiece can be easily taken out, the limiting screw 7 does not need to be completely unscrewed and then is taken out, and replacement and assembly time is shortened.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the principles of this invention. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A once clamping and milling clamp for a cycloidal gear of an RV reducer is characterized by comprising a processing seat, a pressing plate, a gasket and a limiting screw;

2. The one-time clamping and milling fixture for the cycloid wheel of the RV reducer as claimed in claim 1 is characterized in that a fixing portion is arranged on the base and used for fixing the machining seat.

3. The one-time clamping and milling fixture for the cycloid wheel of the RV reducer as claimed in claim 2 is characterized in that the fixing portions are U-shaped grooves formed in two ends of the base, and the U-shaped grooves are matched with T-shaped grooves of a machine tool.

4. The fixture for one-time clamping and milling of the cycloidal gear of the RV reducer according to claim 1 is characterized in that a gap between the central shaft and a central hole of the cycloidal gear is 0-0.02 mm.

5. The one-time clamping and milling fixture for the cycloid wheel of the RV reducer as claimed in claim 1 is characterized in that the processing table is of a cylindrical structure, blanking holes are formed in the top surface of the processing table, side face holes are formed in the side faces of the processing table, the side face holes are communicated with the blanking holes, and the top end of the central shaft extends out of the top surface of the processing table.

6. The one-time clamping and milling fixture for the cycloid wheel of the RV reducer as recited in claim 5 wherein the blanking holes are vertical holes which are circumferentially and uniformly distributed outside the central shaft and the side holes are in one-to-one correspondence with the vertical holes.

7. The one-time clamping and milling clamp for the cycloid wheel of the RV reducer as claimed in claim 6, characterized in that the number of the vertical holes is 3.

8. The fixture for one-time clamping and milling of the cycloidal gear of the RV reducer is characterized in that the side surface of the top end of the processing table is higher than the top surface, an avoiding space is formed between the top surface and the side surface higher than the top surface, and when the cycloidal gear to be processed is fixed on the processing table, a space exists between the top surface of the processing table and the bottom surface of the cycloidal gear.

9. The one-time clamping and milling clamp for the cycloid wheel of the RV reducer as claimed in claim 1, characterized in that the gasket is an open gasket, and the inner diameter of the pressure plate is larger than the outer diameter of the limit screw.

10. The one-time clamping and milling clamp for the cycloid wheel of the RV reducer as claimed in claim 1, characterized in that the processing table and the base are integrally formed.