Welding exhaust groove structure of speed reducer gear shaft, speed reducer and automobile

Abstract

The utility model belongs to the field of new energy automobiles, and particularly relates to a welding exhaust groove structure of a speed reducer gear shaft, a speed reducer and an automobile. Comprising an intermediate shaft, a shaft inner hole is formed in the intermediate shaft, and the shaft inner hole is communicated with the outside; annular grooves are coaxially formed in the input driven gear, the inner wall of the input driven gear and / or the outer wall of the intermediate shaft, so that when the input driven gear and the intermediate shaft are coaxially matched, the input driven gear and the intermediate shaft jointly define an exhaust cavity, a welding seam is formed in one side of the welding matching surface, and the welding seam communicates with the exhaust cavity; a channel is formed in the middle shaft, one end of the channel communicates with the exhaust cavity, and the other end of the channel communicates with the shaft inner hole so as to execute welding hot gas exhaust operation. According to the utility model, the design of a spiral exhaust groove in the prior art is canceled and replaced by the channel from the exhaust cavity to the shaft inner hole. The processing cost of the channel is better than that of a spiral exhaust groove, and the cost of the technical scheme is reduced by about 5% compared with that of an existing scheme. Therefore, the competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model belongs to the field of new energy vehicles, and particularly relates to a welding exhaust groove structure of a reducer gear shaft, a reducer and a vehicle. Background Art

[0002] At present, the structure of the reducer part of the electric drive products of new energy vehicles on the market generally adopts a parallel shaft two-stage reducer design for efficiency and cost considerations. Some intermediate shaft components use welding to connect the primary driven gear and the intermediate shaft to reduce the total weight of the electric drive product.

[0003] In order to discharge the hot air generated by welding to improve the quality of welding, such as Figure 2 and Figure 3 ,in, Figure 2 It is a schematic diagram of the exhaust structure of the reducer in the prior art. Figure 3 It is a partial enlarged schematic diagram of the spiral exhaust groove in the prior art. It can be clearly seen from the schematic diagram that in the prior art, when the intermediate shaft I and the input driven gear I are connected by welding, a through exhaust chamber I structure is usually provided at the bottom of the weld I, and the input driven gear mating surface has a spiral exhaust groove I structure. It can be seen from the figure that firstly, the processing cost of the spiral exhaust groove I on the input driven gear I is relatively high: in order to ensure the welding quality, two spiral exhaust grooves I need to be processed. Secondly, the wear cost of the hard turning tool: when processing the mating surface of the hard wheel hub, intermittent processing greatly shortens the service life of the turning tool and increases the turning cost; in addition, the exhaust performance of the spiral exhaust groove I structure at the existing welding is also poor. Taking into account the depth, exhaust area and exhaust stroke of the spiral exhaust groove I, the exhaust efficiency during welding is not high, resulting in a large amount of heat energy cannot be discharged in time, affecting product performance. In view of the above problems, it is necessary to optimize and improve the existing spiral exhaust groove I structure. Utility Model Content

[0004] In view of the above problems, the utility model proposes a welding exhaust groove structure of a reducer gear shaft, comprising:

[0005] An intermediate shaft, wherein an inner shaft hole is provided in the intermediate shaft, and the inner shaft hole is communicated with the outside;

[0006] An input driven gear, wherein an annular groove is coaxially formed on the inner wall of the input driven gear and / or the outer wall of the intermediate shaft, so that when the input driven gear and the intermediate shaft are coaxially matched, they jointly enclose an exhaust cavity, a weld is formed on one side of the welding matching surface, and the weld is connected to the exhaust cavity;

[0007] The intermediate shaft is provided with a channel, one end of the channel is communicated with the exhaust cavity, and the other end of the channel is communicated with the inner hole of the shaft, so as to perform the welding hot gas exhaust operation.

[0008] Preferably, the intermediate shaft is a stepped shaft structure, and a first annular groove is coaxially provided at the large diameter section;

[0009] A second annular groove is coaxially provided at the inner hole of the input driven gear, and the input driven gear is coaxially arranged on the intermediate shaft, and the first annular groove and the second annular groove are jointly enclosed to form an exhaust chamber.

[0010] Preferably, the first annular groove and the second annular groove are consistent in shape and size, the input driven gear is inserted from the small diameter end of the intermediate shaft, sleeved to the intermediate shaft shoulder end and flush with the input driven gear hub end, and the first annular groove is aligned with the second annular groove notch.

[0011] Preferably, a channel is opened on the inner wall of the second annular groove along the radial direction of the intermediate shaft, and the channel is connected with the inner hole of the shaft, and the channel constitutes the passage.

[0012] Preferably, the hole is a circular hole, and the hole diameter is smaller than the width of the second annular groove.

[0013] Preferably, there are at least two circular holes arranged in a circular array along the axis of the intermediate shaft 1, and the hole depth of the circular holes is h, and 9mm≤h≤10mm.

[0014] Preferably, the small diameter section of the intermediate shaft and the large diameter section of the intermediate shaft are provided with tool withdrawal grooves.

[0015] The present application also claims protection for a reducer that uses the above-mentioned welding exhaust groove structure, wherein the welding exhaust groove structure is used at the welding point between the input driven gear and the intermediate shaft of the reducer to perform the operation of removing welding hot air.

[0016] The present application also claims protection for a car that uses the above-mentioned reducer, and the car uses the reducer to transmit power.

[0017] Beneficial Effects

[0018] The welded exhaust groove structure claimed by the utility model eliminates the spiral exhaust groove design in the prior art and replaces it with a channel from the exhaust cavity to the inner hole of the shaft. The processing cost of the channel is more advantageous than that of the spiral exhaust groove. For the intermediate shaft assembly, this technical solution reduces the cost by about 5% compared with the existing solution, thereby improving the competitiveness of the product.

[0019] Since the channel of the utility model penetrates the inner hole of the shaft, the exhaust stroke is greatly shortened compared with the existing structure, and the exhaust area is improved, so the exhaust performance is better than the existing technical design. Good exhaust performance can efficiently remove the large amount of heat energy generated during welding, thereby minimizing the negative impact of heat energy on parts and ensuring product performance.

[0020] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It shows a schematic diagram of the structure of the welding exhaust groove in the embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the exhaust structure of the reducer in the prior art;

[0024] Figure 3 It is a partial enlarged schematic diagram of the spiral exhaust groove in the prior art.

[0025] In the figure,

[0026] 1. Intermediate shaft; 10. Inner hole of shaft;

[0027] 2. Input driven gear;

[0028] N1, annular groove; 11, first annular groove; 21, second annular groove;

[0029] 3. Welding seam;

[0030] 4. Channel. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] refer to Figure 1 , Figure 1 The schematic diagram of the welding exhaust groove structure in the embodiment of the utility model is shown; it can be clearly seen from the schematic diagram that a welding exhaust groove structure of a reducer gear shaft includes:

[0033] An intermediate shaft 1, wherein an inner shaft hole 10 is provided in the intermediate shaft 1, and the inner shaft hole 10 is communicated with the outside;

[0034] The input driven gear 2, the inner wall of the input driven gear 2 and / or the outer wall of the intermediate shaft 1 are coaxially provided with an annular groove N1, so that when the input driven gear 2 and the intermediate shaft 1 are coaxially matched, they jointly enclose and form an exhaust cavity, and a weld 3 is formed on one side of the welding matching surface, and the weld 3 is connected with the exhaust cavity;

[0035] A channel 4 is provided in the intermediate shaft 1, one end of the channel 4 is communicated with the exhaust chamber, and the other end of the channel 4 is communicated with the shaft inner hole 10, so as to perform the welding hot gas exhaust operation.

[0036] The welded exhaust groove structure claimed by the utility model eliminates the spiral exhaust groove design in the prior art and replaces it with a channel 4 from the exhaust cavity to the shaft inner hole 10. The processing cost of the channel 4 is more advantageous than that of the spiral exhaust groove. For the intermediate shaft assembly, this technical solution reduces the cost by about 5% compared with the existing solution, thereby improving the competitiveness of the product.

[0037] Since the channel 4 of the utility model is connected to the inner hole 10 of the shaft, the exhaust stroke is greatly shortened compared with the existing structure, and the exhaust area is improved, so the exhaust performance is better than the existing technical design. Good exhaust performance can efficiently remove a large amount of heat energy generated during welding, thereby minimizing the negative impact of heat energy on parts and ensuring product performance.

[0038] In specific practice, the spiral exhaust groove structure in the prior art and the welding exhaust groove structure of the present application are further measured for welding gas discharge under the same welding conditions and similar welding techniques, and Table 1 is obtained:

[0039] Table 1

[0040]

[0041] The intermediate shaft 1 is a stepped shaft structure, and a cutter recess is provided at the small diameter section and the large diameter section of the intermediate shaft 1, and a first annular groove 11 is coaxially provided at the large diameter section;

[0042] A second annular groove 21 is coaxially formed at the inner hole of the input driven gear 2 , and the input driven gear 2 is coaxially mounted on the intermediate shaft 1 . The first annular groove 11 and the second annular groove 21 together enclose an exhaust chamber.

[0043] Specifically, the first annular groove 11 and the second annular groove 21 are consistent in shape and size, the input driven gear 2 is inserted from the small diameter end of the intermediate shaft 1, and is sleeved to the shoulder end of the intermediate shaft 1 flush with the hub end of the input driven gear 2, and the notches of the first annular groove 11 and the second annular groove 21 are aligned.

[0044] The inner wall of the second annular groove 21 is provided with a channel along the radial direction of the intermediate shaft 1, and the channel is connected with the inner hole 10 of the shaft, and the channel forms a channel 4, and the channel is a circular hole, and the hole diameter is smaller than the groove width of the second annular groove 21. There are at least two circular holes, which are arranged in a circular array along the axis of the intermediate shaft 1, and the hole depth of the circular hole is h, and 9mm≤h≤10mm.

[0045] The utility model also claims to protect a reducer, wherein a welding exhaust groove structure is applied at the welding position between the input driven gear and the intermediate shaft of the reducer to perform the operation of exhausting welding hot air.

[0046] The utility model also claims to protect a car which uses a reducer to transmit power.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding exhaust groove structure of a reducer gear shaft, characterized in that: include: An intermediate shaft (1), wherein an inner shaft hole (10) is provided in the intermediate shaft (1), and the inner shaft hole (10) is communicated with the outside; An input driven gear (2), wherein an annular groove (N1) is coaxially provided on the inner wall of the input driven gear (2) and / or the outer wall of the intermediate shaft (1), so that when the input driven gear (2) and the intermediate shaft (1) are coaxially matched, they jointly enclose an exhaust cavity, a weld (3) is formed on one side of the welded matching surface, and the weld (3) is communicated with the exhaust cavity; The intermediate shaft (1) is provided with a channel (4), one end of the channel (4) is connected to the exhaust chamber, and the other end of the channel (4) is connected to the shaft inner hole (10), so as to perform welding hot gas exhaust operations.

2. A welding exhaust groove structure for a reducer gear shaft according to claim 1, characterized in that: The intermediate shaft (1) is a stepped shaft structure, and a first annular groove (11) is coaxially provided at the large diameter section; A second annular groove (21) is coaxially provided at the inner hole of the input driven gear (2), and the input driven gear (2) is coaxially mounted on the intermediate shaft (1), and the first annular groove (11) and the second annular groove (21) together enclose an exhaust chamber.

3. A welding exhaust groove structure for a reducer gear shaft according to claim 2, characterized in that: The first annular groove (11) and the second annular groove (21) are of the same shape and size; the input driven gear (2) is inserted through the small diameter end of the intermediate shaft (1) and sleeved to the shoulder end of the intermediate shaft (1) flush with the hub end of the input driven gear (2); the notches of the first annular groove (11) and the second annular groove (21) are aligned.

4. A welding exhaust groove structure for a reducer gear shaft according to claim 3, characterized in that: The inner wall of the second annular groove (21) is provided with a channel along the radial direction of the intermediate shaft (1), and the channel is connected to the inner hole (10) of the shaft, and the channel constitutes the passage (4).

5. A welding exhaust groove structure for a reducer gear shaft according to claim 4, characterized in that: The hole is a circular hole, and the hole diameter is smaller than the groove width of the second annular groove (21).

6. A welding exhaust groove structure for a reducer gear shaft according to claim 5, characterized in that: There are at least two circular holes arranged in a circular array along the axis of the intermediate shaft (1), and the depth of the circular holes is h, and 9mm≤h≤10mm.

7. The welding exhaust groove structure of the reducer gear shaft according to claim 1, characterized in that: The small diameter section of the intermediate shaft (1) and the large diameter section of the intermediate shaft (1) are provided with a cutter recess.

8. A reducer, using the welded exhaust groove structure according to any one of claims 1 to 7, characterized in that: A welding exhaust groove structure is applied to the welding point between the input driven gear and the intermediate shaft of the reducer to perform the operation of exhausting welding hot air.

9. An automobile, using a reducer as claimed in claim 8, characterized in that: The car uses a reducer to transmit power.

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