Planetary gear roller pin assembly assistive device and assembly method thereof

Abstract

The invention relates to an assembly assistive device for a roller pin in a planetary gear, in particular to an assembly assistive device for a roller pin in a planetary gear, which is characterized in that a clearance fit positioning shaft (2) is inserted into a central positioning hole of a positioning circular truncated cone on a positioning support (1), a plurality of ring grooves are uniformly distributed on the cylindrical surface of the positioning shaft (2), and an elastic ring (3) is embedded into each ring groove; the outer cylindrical surface of the positioning circular truncated cone of the positioning support (1) is in clearance fit with an inner hole of a planetary gear (4); a plurality of axial vertical roller pins (7) can be vertically placed in an annular gap between the positioning shaft (2) mounted on the positioning support (1) and the planetary gear (4) to fully cover the annular gap, and each roller pin (7) is positioned and fixed on the inner hole wall of the planetary gear (4) under the elastic deformation acting force of the elastic ring (3) in the annular groove of the positioning shaft (2). The roller pin is prevented from falling off and toppling over in the operation process, and the assembling quality and efficiency are improved.

Description

Technical Field

[0001] The invention relates to an assembly aid for a needle roller in a planetary gear, in particular to an assembly aid for a needle roller in a planetary gear and an assembly method thereof. Background Art

[0002] The structure of the planetary gear assembly in the prior art is as follows: Figure 6 As shown, the planetary gear 4 is installed in the corresponding position of the planetary carrier 6 through a planetary gear shaft 9, and the annular gap between the planetary gear 4 and the planetary gear shaft 9 is filled with upper and lower rows of needle rollers, which are separated by a needle roller spacer to avoid mutual interference between the upper and lower rows of needle rollers. The installation of the needle rollers in the planetary gear is relatively complicated. The prior art is to adhere the needle rollers along the inner hole wall of the planetary gear for a circle with lithium-based grease. The adhered needle rollers are not positioned and fixed, and the needle rollers are easy to fall off and tip over during operation, and the assembly efficiency is low. Summary of the invention

[0003] The purpose of the invention is to solve the problems that the installation of the needle roller in the planetary gear is complicated, the needle roller cannot be positioned and fixed, the needle roller is easy to fall off and topple over during operation, and the assembly efficiency is low.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a planetary gear needle roller assembly aid, including a positioning support, a positioning cone on the positioning support, a positioning shaft with a clearance fit is inserted into the central positioning hole of the positioning cone, wherein a plurality of annular grooves are evenly distributed on the cylindrical surface of the positioning shaft, and an elastic ring is embedded in each annular groove; during assembly, the outer cylindrical surface of the positioning cone on the positioning support is clearance-fitted with the inner hole of a planetary gear.

[0005] Furthermore, there are four annular grooves evenly distributed on the cylindrical surface of the positioning shaft.

[0006] Furthermore, the outer diameter of the elastic ring embedded in the annular groove of the positioning shaft is 2-4 mm larger than the outer diameter of the positioning shaft.

[0007] Furthermore, the annular gap between the positioning shaft installed on the positioning support and the planetary gear can be used to vertically place multiple axially plumb needle rollers to fill the annular gap, and after the needle roller spacer and needle roller are placed in the annular gap in sequence, the upper end surface of the needle roller is flush with the upper end surface of the planetary gear.

[0008] Furthermore, the central axis of the central positioning hole of the positioning cone on the positioning support is coaxial with the central axis of the planetary gear installed on the positioning support and the central axis of the positioning shaft.

[0009] A planetary gear needle roller assembly method is implemented using the planetary gear needle roller assembly aid, and comprises the following steps: The first step is to insert the positioning shaft into the central positioning hole of the positioning cone on the positioning support, and then insert the inner hole of the planetary gear into the outer cylindrical surface of the positioning cone on the positioning support, and then put a needle roller spacer into the annular gap between the positioning shaft and the planetary gear, and then insert multiple needle rollers into the annular gap, and fill the annular gap with needle rollers, wherein the elastic rings embedded in the corresponding two annular grooves on the positioning shaft clamp the needle rollers filled in the annular gap to the inner hole wall of the planetary gear; The second step is to turn the end of the planetary gear filled with needle rollers downward and place it on the assembly table, remove the positioning support located on the upper side after the turn, and then fill the annular gap between the positioning shaft and the planetary gear at this end with needle rollers; The third step is to place the planetary gear filled with needle rollers and the positioning shaft as a whole in the corresponding assembly position of the planetary carrier, and cover the two end faces of the planetary gear filled with needle rollers with a gasket, then insert a planetary gear shaft into the corresponding planetary gear assembly hole of the planetary carrier, and use the planetary gear shaft to push out and replace the positioning shaft in the inner hole of the planetary gear, completing the assembly of the needle rollers in the planetary gear, and also completing the assembly of the planetary gear in the corresponding position of the planetary carrier.

[0010] Beneficial effects of the present invention: Compared with the prior art, during the needle roller assembly process of the planetary gear, each assembled needle roller is positioned and fixed on the inner hole wall of the planetary gear under the elastic force of the elastic ring in the positioning shaft ring groove, thereby preventing the needle roller from falling off and tipping over during operation and improving the assembly quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the assembly structure of a planetary gear needle roller assembly aid of the present invention; Figure 2 It is a structural schematic diagram of a planetary gear needle roller assembly auxiliary tool of the present invention; Figure 3 It is a schematic diagram of the first planetary gear assembly structure of a planetary gear needle roller assembly aid and an assembly method thereof of the present invention; Figure 4 yes Figure 3 AA cross-sectional structural diagram; Figure 5 It is a schematic diagram of the second planetary gear assembly structure of a planetary gear needle roller assembly aid and an assembly method thereof of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of a planetary gear assembly in the prior art of the present invention.

[0012] As shown in the figure: 1- locating support, 2- locating shaft, 3- elastic ring, 4- planetary gear, 5- needle roller spacer, 6- planetary carrier, 7- needle roller, 8- gasket, 9- planetary gear shaft. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0014] like Figures 1 to 5 As shown, the planetary gear needle roller assembly aid comprises a positioning support 1, on which is a positioning cone, in which is inserted a positioning shaft 2 with a clearance fit in the central positioning hole of the positioning cone, wherein a plurality of annular grooves are evenly distributed on the cylindrical surface of the positioning shaft 2, and an elastic ring 3 is embedded in each annular groove; during assembly, the outer cylindrical surface of the positioning cone on the positioning support 1 is clearance-fitted with the inner hole of a planetary gear 1.

[0015] like Figure 2 As shown, there are four evenly distributed annular grooves on the cylindrical surface of the positioning shaft 2.

[0016] like Figure 2 As shown, the outer diameter of the elastic ring 3 embedded in the annular groove of the positioning shaft 2 is 2-4 mm larger than the outer diameter of the positioning shaft 2 .

[0017] like Figure 1 As shown, the annular gap between the positioning shaft 2 installed on the positioning support 1 and the planetary gear 4 can be used to vertically place multiple axially plumb needle rollers 7 to fill the annular gap, and after the needle roller spacer 5 and the needle roller 7 are placed in the annular gap in sequence, the upper end surface of the needle roller 7 is flush with the upper end surface of the planetary gear 4.

[0018] In the above embodiment, the annular gap between the entire planetary gear 4 and the positioning shaft 2 can be filled with two upper and lower rows of needle rollers 7, wherein each row of needle rollers 7 is in contact with the elastic rings 3 embedded in the two annular grooves, and is positioned and fixed on the inner hole wall of the planetary gear 4 under the elastic force of the elastic ring 3, so as to avoid the needle rollers falling off and tipping over during operation; the upper and lower rows of needle rollers 7 are separated by needle roller spacers 5 to avoid mutual interference between the upper and lower rows of needle rollers 7.

[0019] like Figure 1 As shown, the central axis of the central positioning hole of the positioning cone on the positioning support 1 is coaxial with the central axis of the planetary gear 4 installed on the positioning support 1 and the central axis of the positioning shaft 2. This implementation scheme is to ensure the assembly accuracy of the needle roller assembly aid.

[0020] A planetary gear needle roller assembly method is implemented using the planetary gear needle roller assembly aid, and comprises the following steps: The first step is to insert the positioning shaft 2 into the central positioning hole of the positioning cone on the positioning support 1, and then insert the inner hole of the planetary gear 4 into the outer cylindrical surface of the positioning cone on the positioning support 1, and then put a needle roller spacer 5 into the annular gap between the positioning shaft 2 and the planetary gear 4, and then insert multiple needle rollers 7 into the annular gap, and fill the annular gap with needle rollers 7, wherein the elastic ring 3 embedded in the corresponding two annular grooves on the positioning shaft 2 clamps the needle rollers 7 filled in the annular gap to the inner hole wall of the planetary gear 4; The second step is to turn the end of the planetary gear 4 filled with the needle rollers 7 downward and place it on the assembly table, remove the positioning support 1 located at the top after the turn, and then fill the annular gap between the positioning shaft 2 and the planetary gear 4 at this end with the needle rollers 7; The third step is to place the planetary gear 4 filled with needle rollers 7 and the positioning shaft 2 as a whole at the corresponding assembly position of the planetary carrier 6, and cover the two end faces of the planetary gear 4 filled with needle rollers 7 with a gasket 8, then insert a planetary gear shaft 9 into the corresponding planetary gear assembly hole of the planetary carrier 6, and use the planetary gear shaft 9 to push out and replace the positioning shaft 2 in the inner hole of the planetary gear 4, completing the assembly of the needle rollers 7 in the planetary gear 4, and also completing the assembly of the planetary gear 4 at the corresponding position of the planetary carrier 6.

[0021] The specific working principle of the present invention is: First, insert the positioning shaft 2 into the central positioning hole of the positioning cone on the positioning support 1, then insert the inner hole of the planetary gear 4 into the outer cylindrical surface of the positioning cone on the positioning support 4, then put a needle roller spacer 5 into the annular gap between the positioning shaft 2 and the planetary gear 4, then insert multiple needle rollers 7 into the annular gap, and fill the annular gap with needle rollers 7, wherein the elastic ring 3 embedded in the corresponding two annular grooves on the positioning shaft 2 clamps the needle rollers 7 filled in the annular gap to the inner hole wall of the planetary gear 4; Secondly, turn the end of the planetary gear 4 filled with needle rollers 7 downward and place it on the assembly table, remove the positioning support 1 located at the top after the turn, and then fill the annular gap between the positioning shaft 2 and the planetary gear 4 at this end with needle rollers 7; Finally, the planetary gear 4 filled with needle rollers 7 and the positioning shaft 2 are placed as a whole in the corresponding assembly position of the planetary carrier 6, and the two end faces of the planetary gear 4 filled with needle rollers 7 are covered with a gasket 8, and then a planetary gear shaft 9 is inserted into the corresponding planetary gear assembly hole of the planetary carrier 6, and the positioning shaft 2 in the inner hole of the planetary gear 4 is pushed out and replaced with the planetary gear shaft 9, completing the assembly of the needle rollers 7 in the planetary gear 4, and also completing the assembly of the planetary gear 4 in the corresponding position of the planetary carrier 6.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any simple modification, equivalent replacement, improvement, etc. made within the technical concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A planetary gear needle roller assembly aid, comprising a positioning support (1), characterized in that: A positioning truncated cone is provided on the positioning support (1), and a positioning shaft (2) with a clearance fit is inserted into the central positioning hole of the positioning truncated cone, wherein a plurality of annular grooves are evenly distributed on the cylindrical surface of the positioning shaft (2), and an elastic ring (3) is embedded in each annular groove; during assembly, the outer cylindrical surface of the positioning truncated cone on the positioning support (1) is clearance-fitted with the inner hole of a planetary gear (4).

2. The planetary gear needle roller assembly aid according to claim 1, characterized in that: There are four evenly distributed annular grooves on the cylindrical surface of the positioning shaft (2).

3. The planetary gear needle roller assembly aid according to claim 2, characterized in that: The outer diameter of the elastic ring (3) embedded in the annular groove of the positioning shaft (2) is 2-4 mm larger than the outer diameter of the positioning shaft (2).

4. The planetary gear needle roller assembly aid according to claim 3, characterized in that: The annular gap between the positioning shaft (2) mounted on the positioning support (1) and the planetary gear (4) can be vertically placed with a plurality of axially vertical needle rollers (7) to fill the annular gap, and after the needle roller spacer (5) and the needle roller (7) are placed in the annular gap in sequence, the upper end surface of the needle roller (7) is flush with the upper end surface of the planetary gear (4).

5. A planetary gear needle roller assembly aid according to any one of claims 1 to 4, characterized in that: The central axis of the central positioning hole of the positioning cone on the positioning support (1) is coaxial with the central axis of the planetary gear (4) mounted on the positioning support (1) and the central axis of the positioning shaft (2).

6. A planetary gear needle roller assembly method, characterized in that: The planetary gear needle roller assembly aid according to claim 1 is used to achieve The following steps are involved: The first step is to insert the positioning shaft (2) into the central positioning hole of the positioning cone on the positioning support (1), then insert the inner hole of the planetary gear (4) into the outer cylindrical surface of the positioning cone on the positioning support (1), then put a needle roller spacer (5) into the annular gap between the positioning shaft (2) and the planetary gear (4), and then insert a plurality of needle rollers (7) into the annular gap, and fill the annular gap with needle rollers (7), wherein the elastic ring (3) embedded in the corresponding two annular grooves on the positioning shaft (2) clamps the needle rollers (7) filled in the annular gap to the inner hole wall of the planetary gear (4); The second step is to turn the end of the planetary gear (4) filled with the needle rollers (7) downward and place it on the assembly table, remove the positioning support (1) located at the top after the turn, and then fill the annular gap between the positioning shaft (2) and the planetary gear (4) at this end with the needle rollers (7); In the third step, the planetary gear (4) filled with needle rollers (7) and the positioning shaft (2) are placed as a whole at the corresponding assembly position of the planetary carrier (6), and a gasket (8) is placed on both end surfaces of the planetary gear (4) filled with needle rollers (7). Then, a planetary gear shaft (9) is inserted into the corresponding planetary gear assembly hole of the planetary carrier (6), and the positioning shaft (2) in the inner hole of the planetary gear (4) is pushed out and replaced by the planetary gear shaft (9), thereby completing the assembly of the needle rollers (7) in the planetary gear (4) and also completing the assembly of the planetary gear (4) at the corresponding position of the planetary carrier (6).

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