A chamfering tool for removing burrs from the tooth end of the pinion gear housing of an RV reducer

Abstract

The present invention discloses a chamfering tool for removing burrs from the tooth end of a pinion gear housing of an RV reducer, comprising a tooling bottom plate, a positioning pin and a spring slider device, wherein two positioning pins contact the outer circle of the pinion gear housing for positioning the center of the circle, and the spring slider device is located in the inner circle of the pinion gear housing, and the spring slider device is provided with a spring and a telescopic head, and the end of the telescopic head is semicircular, and the diameter is larger than the grinding diameter of the pinion gear housing, and the end of the telescopic head contacts the tooth top chamfer of two adjacent inner teeth of the pinion gear housing, and is used to cooperate with the two positioning pins to fix the pinion gear housing. The present invention does not contact the tooth surface when positioning and fixing the pinion gear housing, effectively avoiding scratches on the tooth surface, improving processing quality, and ensuring processing accuracy, and can be applied to pinion gear housings of different specifications, is easy to operate, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to the field of RV reducer pin gear housing processing, in particular to a chamfering tool for removing burrs from the tooth end of the RV reducer pin gear housing. Background Art

[0002] In the RV reducer, one of the components is the needle gear housing. After grinding the internal teeth, burrs will appear at both ends. If the burrs are not removed, the burrs will be gradually squeezed out and fall off in the inner cavity of the reducer during operation. The burrs and iron filings that fall off will affect the service life of the reducer as the reducer runs, causing problems such as abnormal noise, and ultimately leading to the inability to guarantee the accuracy of the accelerator and shortening its life. In order to solve the burr problem, when the existing needle gear housing is ground and the burrs on both ends of the teeth are removed using a CNC machine tool (CNC), the tooling used to fix the needle gear housing is to set two locating pins that are respectively embedded in the needle gear grooves on the tooling bottom plate, and the locating pins contact the tooth surface for positioning. However, this fixing method is prone to scratches on the tooth surface during processing. After scratches, the needle roller cannot rotate and the positioning accuracy is poor, resulting in frequent rework of burr problems that delay the normal assembly progress. In addition, due to the two-tooth positioning, the workpiece is easily installed incorrectly due to negligence during the processing, resulting in large positioning errors and scrapping of the processed products. Moreover, since the two positioning pins are embedded in the needle tooth groove, each tooling can only be adapted to one needle tooth shell specification. Frequent replacement of tooling not only reduces production efficiency, but also easily causes collision accidents. Although there are special equipment for deburring on the market, the equipment is expensive, and large-scale production will also extend high cost investment.

[0003] Therefore, how to create a new chamfering tool for removing burrs from the tooth ends of the pinion gear housing of the RV reducer is one of the important research and development topics at present. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a chamfering tool for removing burrs from the tooth end of the pinion gear housing of an RV reducer, so that the chamfering tool does not contact the tooth surface of the inner tooth when positioning the pinion gear housing, and does not affect the gear grinding accuracy. The chamfering tool is suitable for pinion gear housings of different specifications, shortens the tooling debugging time for production changeover, simplifies the processing technology, effectively ensures the processing accuracy of the pinion gear housing, and improves production efficiency, thereby overcoming the shortcomings of the existing technology.

[0005] In order to solve the above technical problems, the present invention provides a chamfering tool for removing burrs from the tooth end of a pinion gear housing of an RV reducer, comprising a tool base plate, a positioning pin and a spring slider device;

[0006] Two cylindrical positioning pins are vertically mounted on the tooling bottom plate, and the positioning pins are in contact with the outer circle of the needle gear housing to locate the center of the circle;

[0007] The spring slider device is installed on the tooling bottom plate and is located inside the inner circle of the pin gear housing. The spring slider device is provided with a spring and a telescopic head. The end of the telescopic head is semicircular and has a diameter larger than the grinding diameter of the pin gear housing.

[0008] The telescopic head is ejected horizontally outward by the elastic force of the spring, and the end of the telescopic head contacts the tooth top chamfers of two adjacent inner teeth of the needle tooth housing, and is used to cooperate with two positioning pins to fix the needle tooth housing.

[0009] As an improvement of the present invention, the spring slider device also includes a base, a top cover and a handle rod. The middle part of the base protrudes upward, and a mounting groove for accommodating a spring and a telescopic top is opened at the protrusion. The top cover is connected to the protrusion of the base by bolts to close the top of the mounting groove. Vertical limiting holes are opened at corresponding positions of the top cover and the telescopic top. The handle rod is inserted into the limiting holes of the top cover and the telescopic top in sequence from top to bottom to limit the telescopic top from popping out.

[0010] Furthermore, the spring slider device is detachably connected to the tooling bottom plate via bolts.

[0011] Furthermore, two rows of adjusting threaded holes are formed on the tooling bottom plate, and the two rows of adjusting threaded holes are arranged in parallel and symmetrically on both sides of the perpendicular midline of the line connecting the centers of the two locating pins, and the spacing between adjacent adjusting threaded holes in each row is equal.

[0012] Furthermore, the height of the upper surface of the telescopic pin is smaller than the height of the upper surface of the inner teeth of the pin gear housing.

[0013] After adopting such a design, the present invention has at least the following advantages:

[0014] 1. Use the telescopic head and two pins for three-point positioning to ensure the stability of the needle gear housing. The semicircular diameter of the end of the telescopic head is larger than the grinding diameter. When fixing the needle gear housing, it contacts the chamfer of the internal tooth top and does not contact the tooth surface, avoiding the influence on the grinding accuracy. The indexing is accurate and the processing quality is improved.

[0015] 2. The two rows of adjustment threaded holes on the bottom plate of the tooling provide multiple installation positions for the spring slider device. By replacing different telescopic heads, it can meet the positioning requirements of needle gear housings of different specifications, improve the versatility of the tooling, shorten the debugging time of tooling changeover, and simplify the processing technology;

[0016] 3. Simple structure, easy to use and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural schematic diagram of a traditional pin gear housing positioning tooling.

[0019] Figure 2 It is a structural schematic diagram of a chamfering tool for removing burrs from the tooth end of a pinion gear housing of an RV reducer provided by the present invention.

[0020] Figure 3 It is a partial enlarged view of the contact point between the telescopic plug and the chamfered corner of the inner tooth of the needle tooth housing.

[0021] Figure 4 It is a front view structural schematic diagram of the spring slider device.

[0022] Figure 5 It is a top view structural schematic diagram of the spring slider device.

[0023] Figure 6 It is a side view structural schematic diagram of the spring slider device.

[0024] Explanation of the reference numerals: 1. tooling base plate; 11. adjusting threaded hole; 2. positioning pin; 3. spring slider device; 31. base; 32. telescopic top; 33. spring; 34. top cover; 35. handle rod. DETAILED DESCRIPTION

[0025] See also Figure 1 The traditional needle gear housing positioning tooling realizes positioning by embedding two positioning pins 2 into the tooth grooves in the needle gear housing. The contact between the positioning pins 2 and the tooth surface can easily cause scratches on the tooth surface, affecting the processing accuracy.

[0026] See also Figures 2 to 6 The present invention provides a chamfering tool for removing burrs from the tooth end of a pinion gear housing of an RV reducer, comprising a tool base plate 1, a positioning pin 2 and a spring slider device 3.

[0027] The tooling base plate 1 is a flat plate surface, which is used to provide support and installation space for the positioning pin 2, the spring slider device 3 and the pin gear housing.

[0028] The positioning pins 2 are cylindrical, two in number, and are vertically mounted on the tooling base plate 1. When positioning the needle gear housing, the positioning pins 2 are in contact with the outer circle of the needle gear housing. When the outer arc surface of the needle gear housing is in close contact with the two positioning pins, the center of the needle gear housing can be ensured to be located on the mid-perpendicular line of the line connecting the centers of the two positioning pins 2, thereby realizing the positioning of the center of the needle gear housing.

[0029] The spring slider device 3 includes a base 31 , a telescopic head 32 , a spring 33 , a top cover 34 and a handle rod 35 .

[0030] The base 31 is connected and fixed to the tooling bottom plate 1 by bolts. The middle part of the base 31 has an upward protrusion, and a horizontal installation groove is opened at the protrusion. A spring 33 and a telescopic head 32 are installed in the installation groove, so that the telescopic head 32 can pop out horizontally from the installation groove.

[0031] The end of the telescopic plug 32 is semicircular, and its diameter is larger than the grinding diameter of the needle gear housing.

[0032] The top cover 34 is connected to the protrusion of the base 31 by bolts, and is used to close the top of the installation groove.

[0033] The handle rod 35 is annular at the upper part and rod-shaped at the lower part. Vertical limiting holes are opened at the corresponding positions of the top cover 34 and the telescopic head 32, and the handle rod 35 is inserted into the limiting holes of the top cover 34 and the telescopic head 35 from top to bottom in sequence to limit the telescopic head 32 from popping out.

[0034] When in use, the spring slider device 3 is entirely located within the inner circle of the needle tooth housing. After the outer circle of the needle tooth housing is in close contact with the two positioning pins 2, the handle pull rod 35 is pulled upward, and the telescopic head 32 is horizontally ejected outward by the elastic force of the spring 33. The end of the telescopic head 32 after ejection contacts the chamfer of the tooth top of the two adjacent inner teeth of the needle tooth housing, which not only realizes the positioning and fixing of the needle tooth housing, but also does not contact the tooth surface. When the needle tooth housing needs to be replaced, the telescopic head 32 can be manually pushed back into the installation slot and the handle pull rod 35 can be inserted, which is convenient and flexible to operate.

[0035] It should be noted that the height of the upper surface of the telescopic head 32 is less than the height of the upper surface of the inner teeth of the pin gear housing, that is, the position of the telescopic head 32 pressing is located in the middle of the chamfer of the inner teeth to avoid interference with the running trajectory of the grinding head of the CNC machine tool.

[0036] Preferably, the tooling bottom plate is provided with two rows of adjusting threaded holes 11, which are arranged parallel and symmetrically on both sides of the perpendicular midline of the line connecting the centers of the two positioning pins 2, and the spacing between adjacent adjusting threaded holes 11 in each row is equal. By fixing the base 31 in different adjusting threaded holes 11 and replacing the telescopic head 32 of appropriate size, the positioning and fixing of needle gear housings of different specifications can be achieved.

[0037] The present invention does not contact the tooth surface when positioning and fixing the needle tooth housing, effectively avoids scratches on the tooth surface, improves processing quality, ensures processing accuracy, is applicable to needle tooth housings of different specifications, is easy to operate, and improves production efficiency.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A chamfering tool for removing burrs from the tooth end of a pinion gear housing of an RV reducer, characterized in that: It includes a tooling base plate, a positioning pin and a spring slider device; Two cylindrical positioning pins are vertically mounted on the tooling bottom plate, and the positioning pins are in contact with the outer circle of the needle gear housing to locate the center of the circle; The spring slider device is installed on the tooling bottom plate and is located inside the inner circle of the pin gear housing. The spring slider device is provided with a spring and a telescopic head. The end of the telescopic head is semicircular and has a diameter larger than the grinding diameter of the pin gear housing. The telescopic head is ejected horizontally outward by the elastic force of the spring, and the end of the telescopic head contacts the chamfered tooth tops of two adjacent inner teeth of the needle gear housing, and is used to cooperate with the two positioning pins to fix the needle gear housing; The spring slider device also includes a base, a top cover and a handle rod. The middle part of the base protrudes upward, and a mounting groove for accommodating a spring and a telescopic top is opened at the protrusion. The top cover is connected to the protrusion of the base by bolts to close the top of the mounting groove. Vertical limiting holes are opened at corresponding positions of the top cover and the telescopic top. The handle rod is inserted into the limiting holes of the top cover and the telescopic top in sequence from top to bottom to limit the telescopic top from popping out.

2. The chamfering tool for removing burrs from the tooth end of the pinion gear housing of an RV reducer according to claim 1 is characterized in that: The spring slider device is detachably connected to the tooling bottom plate via bolts.

3. The chamfering tool for removing burrs from the tooth end of the pinion gear housing of an RV reducer according to claim 1, characterized in that: The tooling bottom plate is provided with two rows of adjusting threaded holes, which are arranged in parallel and symmetrically on both sides of the perpendicular midline of the line connecting the centers of the two positioning pins, and the spacing between adjacent adjusting threaded holes in each row is equal.

4. The chamfering tool for removing burrs from the tooth end of the pinion gear housing of an RV reducer according to claim 1, characterized in that: The height of the upper surface of the telescopic head is less than the height of the upper surface of the inner teeth of the pin gear housing.

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