阅读说明：本技术 电动工具齿轮箱传动轴及其制造工艺 (Electric tool gear box transmission shaft and manufacturing process thereof ) 是由 陈永生 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种电动工具齿轮箱传动轴,包括轴体与端盖,所述轴体包括轴部、设置在轴部其中一端的第一腹板以及设置在第一腹板外侧面上的呈圆周均布的若干支架,相邻的两个支架之间形成了行星齿轮槽；所述端盖包括第二腹板以及设置在第二腹板外侧面的中心的轴段；所述第二腹板、支架与第一腹板共同形成了行星架；所述第二腹板与若干支架之间设有定位结构。采用了上述技术方案之后,传动轴可实现分段式加工,并根据本发明提供的电动工具齿轮箱传动轴制造工艺,将轴体与端盖连接为一体。(The invention discloses a transmission shaft of a gear box of an electric tool, which comprises a shaft body and an end cover, wherein the shaft body comprises a shaft part, a first web plate arranged at one end of the shaft part and a plurality of supports which are uniformly distributed on the outer side surface of the first web plate in a circumferential manner, and a planetary gear groove is formed between every two adjacent supports; the end cover comprises a second web plate and a shaft section arranged in the center of the outer side face of the second web plate; the second web plate, the bracket and the first web plate form a planet carrier together; and a positioning structure is arranged between the second web and the plurality of brackets. After the technical scheme is adopted, the transmission shaft can be processed in a sectional mode, and the shaft body and the end cover are connected into a whole according to the manufacturing process of the transmission shaft of the gearbox of the electric tool provided by the invention.)

1. A kind of electric tool gear box drive shaft, characterized by: the gear transmission shaft comprises a shaft body and an end cover, wherein the shaft body comprises a shaft part, a first web plate arranged at one end of the shaft part and a plurality of supports which are uniformly distributed on the outer side surface of the first web plate in a circumferential manner, and a planetary gear groove is formed between every two adjacent supports; the end cover comprises a second web plate and a shaft section arranged in the center of the outer side face of the second web plate; the second web plate, the bracket and the first web plate form a planet carrier together; and a positioning structure is arranged between the second web and the plurality of brackets.

2. A power tool gearbox drive shaft according to claim 1 wherein: the positioning structure comprises edge-covering flanges which are arranged on the side surfaces of the second web plates and are matched with the plurality of supports in a one-to-one correspondence mode, and the inner walls of the edge-covering flanges are matched and coated on the outer peripheral surfaces of the supports.

3. A power tool gearbox drive shaft according to claim 1 wherein: the positioning structure comprises a clamping groove formed in the support and a clamping block arranged on the side face of the second web and matched with the clamping groove correspondingly.

4. A power tool gearbox drive shaft according to claim 1 wherein: the cross section of the bracket is of a nearly triangular structure.

5. The invention also provides a manufacturing process of a transmission shaft of a gearbox of an electric tool, which is used for processing the transmission shaft of the gearbox of the electric tool as claimed in any one of claims 1 to 4 into a whole, and is characterized in that: the method comprises the following steps:

(1) manufacturing a shaft body through cold heading, and then performing cold extrusion molding on the shaft body;

(2) manufacturing an end cap by cold heading;

(3) accurately positioning and splicing the shaft body and the end cover together through a positioning structure, and performing press fit;

(4) welding the shaft body and the end cover into a whole;

(5) machining the end face (including the outer side face and the outer peripheral face) of the end cover by using a lathe, and boring the center of the shaft section;

(6) processing a planetary gear shaft hole on the first web plate and the second web plate;

(7) milling a ball groove on the shaft part of the shaft body;

(8) carburizing and quenching the transmission shaft;

(9) and finally, performing cylindrical grinding on the shaft part and the shaft section of the whole transmission shaft, thereby finishing the manufacturing of the transmission shaft.

6. The manufacturing process of the transmission shaft of the gearbox of the electric tool as claimed in claim 5, wherein: in the step (4), oxygen-free red copper or copper sheets are used as filling materials between the shaft body and the end cover and filled in a connecting gap between the shaft body and the end cover, so that the shaft body and the end cover are welded into a whole, and the welding temperature is kept at 1080 ℃.

7. The manufacturing process of the transmission shaft of the gearbox of the electric tool as claimed in claim 5, wherein: in the step (4), after the shaft body and the end cover are welded into a whole, the connection tension borne by the whole body needs to be controlled to be greater than or equal to 10KN, and the torque is controlled to be greater than or equal to 200N M.

8. The manufacturing process of the transmission shaft of the gearbox of the electric tool as claimed in claim 5, wherein: in the step (4), after the shaft body and the end cover are welded into a whole, the welded transmission shaft needs to be checked, and the elimination of no copper water or the elimination of the phenomenon that copper water overflows to the outside to form accretions is required.

9. The manufacturing process of the transmission shaft of the gearbox of the electric tool as claimed in claim 5, wherein: in the step (1), the shaft part, the first web plate and the bracket of the shaft body can be manufactured by cold heading respectively, the center of one side surface of the first web plate is provided with an embedding groove corresponding to the shaft part, and the other side surface of the first web plate is provided with an installation groove corresponding to the bracket, so that the shaft part and the first web plate of the shaft body and the first web plate and the bracket of the shaft body can be connected by brazing.

Technical Field

The invention relates to a transmission shaft of a gear box of an electric tool and a manufacturing process thereof.

Background

The transmission shaft of the gear box of the electric tool, which is also called as a cam shaft and an intermediate shaft, is widely used on the gear box of the electric tool such as an impact wrench or an impact screw and the like, and plays a role in transmitting power.

At present, there are two methods for manufacturing three-tooth and above-three-tooth transmission shafts: firstly, a precision casting process is adopted, the transmission shaft has the casting defects of air holes, slag inclusion, looseness, cold shut and the like, and the risk rate of blocking and fracture is high in the using process; secondly, a milling process is adopted, three planetary gear grooves of the transmission shaft need to be milled, and the process is low in production efficiency and high in cost. Although the two methods can manufacture the three-tooth or more-tooth transmission shaft, the two methods have the defects of low yield, low production efficiency, high cost, resource waste and environmental pollution.

Chinese patent application No. 201580059102.3 discloses an impact tool and a method of manufacturing a main shaft for an impact tool, in which the main shaft is divided into 3 or 2 parts, the parts are joined to each other to form the main shaft, and the joined portion is brazed, thereby achieving the purpose of easy machining and cost reduction. However, in the above-described manufacturing method, there may be an error in the joining or coupling of the respective parts, which may cause an error in the spindle integrated after brazing, resulting in deterioration in performance of the impact tool, and in the above-described spindle for an impact tool, the accuracy cannot be secured when the respective segment parts are initially joined.

Disclosure of Invention

The invention aims to solve the technical problems of large error, low yield, low production efficiency, high cost, resource waste and environmental pollution of the transmission shaft of the gear box of the conventional electric tool.

In order to solve the technical problems, the invention provides a transmission shaft of a gear box of an electric tool, and the technical scheme is as follows:

a transmission shaft of a gear box of an electric tool comprises a shaft body and an end cover, wherein the shaft body comprises a shaft part, a first web plate arranged at one end of the shaft part and a plurality of supports which are uniformly distributed on the outer side surface of the first web plate in a circumferential manner, and a planetary gear groove is formed between every two adjacent supports; the end cover comprises a second web plate and a shaft section arranged in the center of the outer side face of the second web plate; the second web plate, the bracket and the first web plate form a planet carrier together; and a positioning structure is arranged between the second web and the plurality of brackets.

The positioning structure comprises edge-covering flanges which are arranged on the side surfaces of the second web plates and are matched with the plurality of supports in a one-to-one correspondence mode, and the inner walls of the edge-covering flanges are matched and coated on the outer peripheral surfaces of the supports.

The positioning structure comprises a clamping groove formed in the support and a clamping block arranged on the side face of the second web and matched with the clamping groove correspondingly.

The cross section of the bracket is of a nearly triangular structure.

The invention also provides a manufacturing process of the transmission shaft of the gearbox of the electric tool, which comprises the following steps:

(1) manufacturing a shaft body through cold heading, and then performing cold extrusion molding on the shaft body;

(2) manufacturing an end cap by cold heading;

(3) accurately positioning and splicing the shaft body and the end cover together through a positioning structure, and performing press fit;

(4) welding the shaft body and the end cover into a whole;

(5) machining the end face (including the outer side face and the outer peripheral face) of the end cover by using a lathe, and boring the center of the shaft section;

(6) processing a planetary gear shaft hole on the first web plate and the second web plate;

(7) milling a ball groove on the shaft part of the shaft body;

(8) carburizing and quenching the transmission shaft;

(9) and finally, performing cylindrical grinding on the shaft part and the shaft section of the whole transmission shaft, thereby finishing the manufacturing of the transmission shaft.

Further, in the step (4), oxygen-free red copper or copper sheets are used as filling materials and filled in the connecting gap between the shaft body and the end cover, so that the shaft body and the end cover are welded into a whole, and the welding temperature is kept at 1080 ℃.

Further, in the step (4), the shaft body and the end cover are welded into a whole, the connection tension borne by the whole body needs to be controlled to be greater than or equal to 10KN, and the torque needs to be controlled to be greater than or equal to 200N M.

Further, in the step (4), after the shaft body and the end cover are welded into a whole, the welded transmission shaft needs to be checked, and the phenomenon that no copper water exists in a welding seam or the copper water overflows to the outside to form accumulated lumps is eliminated.

Further, in the step (1), the shaft portion, the first web and the bracket of the shaft body can be manufactured by cold heading respectively, the center of one side surface of the first web is provided with an embedding groove corresponding to the shaft portion, and the other side surface of the first web is provided with an installation groove corresponding to the bracket, so that the shaft portion and the first web of the shaft body and the first web and the bracket of the shaft body can be connected by brazing.

According to the invention, the shaft body and the end cover are accurately positioned and connected by adopting the positioning structure, and the shaft body and the end cover of the transmission shaft are fused together at high temperature by brazing, so that the processing difficulty is reduced, and the structure and the strength of the original product are maintained

In the invention, the shaft body of the transmission shaft can also adopt a split welding mode, namely: the shaft part, the first web plate and the bracket can be respectively processed, and finally splicing and welding are carried out, so that the traditional precision casting or milling processing manufacturing process of the transmission shaft is changed, and the transmission shaft has the characteristics of high quality and low cost.

Drawings

FIG. 1 is a perspective view of a finished drive shaft of a gearbox for a power tool according to the present invention;

FIG. 2 is a perspective view of the shaft body of the drive shaft of the gearbox of the power tool of the present invention;

fig. 3 is an exploded perspective view of the end cap of the drive shaft of the gearbox of the power tool of the present invention with a flange.

Detailed Description

The present invention will now be described in further detail with reference to examples, but the present invention is not limited to the following examples, and any modifications made thereto will fall within the scope of the present invention.

Referring to fig. 1 to 3, a transmission shaft of a gearbox of an electric tool includes a shaft body 1 and an end cover 2, where the shaft body 1 includes a shaft portion 3, a first web 4 disposed at one end of the shaft portion 3, and a plurality of circumferentially and uniformly distributed brackets 5 disposed on an outer side surface of the first web 4, and a planetary gear groove 6 is formed between two adjacent brackets 5; the end cap 2 comprises a second web 7 and a shaft section 8 arranged in the center of the outer side face of the second web 7; the second web 7, the bracket 5 and the first web 4 together form a planet carrier; and a positioning structure is arranged between the second web 7 and the plurality of brackets 5.

The positioning structure of the invention has two embodiments, one of which is: the positioning structure comprises edge-covering flanges 9 which are arranged on the side surfaces of the second web plates 7 and are matched with the plurality of supports 5 in a one-to-one correspondence mode, and the inner walls of the edge-covering flanges 9 are matched and coated on the outer peripheral surfaces of the supports 5.

Another embodiment is: the positioning structure comprises a clamping groove 10 arranged on the bracket 5 and a clamping block (not shown in the figure) arranged on the side surface of the second web 7 and correspondingly matched with the clamping groove 10.

Adopt any one kind location structure, all can make axis body 1 and end cover 2 realize accurate concatenation, if: when the positioning structure of the first embodiment is adopted, the edge-covering flange 9 on the end cover 2 is arc-shaped, the arc of the outer peripheral surface of the support 5 is consistent with the arc of the inner wall of the edge-covering flange 9, and the edge-covering flange 9 can be wrapped on the support 5 only when the two parts are accurately spliced, so that accurate connection can be realized.

When the positioning structure of the second embodiment is adopted, the positioning structure is simpler, and only a plurality of clamping blocks (not shown in the figure) on the end cover 2 are required to be clamped in the clamping grooves 10 in a one-to-one correspondence manner.

The cross-section of the support 5 is of a nearly triangular structure, and the support of the nearly triangular structure has the following advantages: the connecting area between the first web plate 4 and the second web plate 7 is ensured to be maximum, meanwhile, the space of the planetary gear groove 6 is ensured, and the convenient installation of the planetary gear is ensured; when the area of being connected of support 5 and first web 4, second web 7 increases, then joint strength between them increases, and the welding degree of difficulty reduces, and simultaneously, support 5 is nearly triangle-shaped structure, specifically is: support 5 has formed three limits, for outside limit 11, two symmetrical inboard side 12, the face at outside limit 11 place is the convex cambered surface of outside hunch-up, and the face at inboard side 12 place is the concave cambered surface of inside sunken, and the benefit of design like this can be so that support 5's self bears the intensity stronger.

The invention discloses a manufacturing process of a transmission shaft of a gearbox of an electric tool, which comprises the following steps:

(1) manufacturing a shaft body 1 through cold heading, and then performing cold extrusion molding on the shaft body 1;

(2) manufacturing the end cap 2 by cold heading;

(3) accurately positioning and splicing the shaft body 1 and the end cover 2 together through a positioning structure, and performing press fit;

(4) welding the shaft body 1 and the end cover 2 into a whole;

(5) machining the end face (including the outer side face and the outer peripheral face) of the end cover 2 by using a lathe, and boring the center of the shaft section 8;

(6) machining planetary gear shaft holes (not shown) in the first web plate 4 and the second web plate 7;

(7) milling a ball groove (not shown) in the shaft portion 3 of the shaft body 1;

(8) carburizing and quenching the transmission shaft;

(9) and finally, performing cylindrical grinding on the shaft part 3 and the shaft section 8 of the whole transmission shaft, thereby finishing the manufacturing of the transmission shaft.

Further, in the step (4), oxygen-free red copper or copper sheets are used as filler and filled in the connecting gap between the shaft body 1 and the end cover 2, so that the shaft body 1 and the end cover 2 are welded into a whole, and the welding temperature is kept at 1080 ℃.

Further, in the step (4), the shaft body 1 and the end cover 2 are welded into a whole, the connection tension borne by the whole body needs to be controlled to be greater than or equal to 10KN, and the torque needs to be controlled to be greater than or equal to 200N × M.

Further, in the step (4), after the shaft body 1 and the end cover 2 are welded into a whole, the welded transmission shaft needs to be checked, and the elimination of no copper water or the elimination of the phenomenon that copper water overflows to the outside to form accretions is required.

Further, in step (1), the shaft portion 3 of the shaft body 1, the first web 4 and the bracket 5 can be manufactured by cold heading respectively, an embedding groove (not shown in the figure) corresponding to and matching with the shaft portion 3 is formed in the center of one side surface of the first web 4, and an installation groove (not shown in the figure) corresponding to and matching with the bracket 5 is formed in the other side surface of the first web 4, so that accurate assembly of the shaft portion 3 and the first web 4 can be achieved, accurate positioning and splicing of the first web 4 and the bracket 5 are achieved, and after connection is achieved between the shaft portion 3 of the shaft body 1 and the first web 4 and between the first web 4 and the bracket 5 through brazing, the machining precision of the shaft body 1 can be guaranteed.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.