CN104265864A

CN104265864A - Powder metallurgical planetary gear for high-power starter

Info

Publication number: CN104265864A
Application number: CN201410474854.3A
Authority: CN
Inventors: 邹德华; 刘子利; 刘希琴; 陆贤文; 徐庆峰; 邹育文; 钱杭君
Original assignee: CHANGSHU HUA-DE POWDER METALLURGY Co Ltd
Current assignee: CHANGSHU HUA-DE POWDER METALLURGY Co Ltd
Priority date: 2014-09-17
Filing date: 2014-09-17
Publication date: 2015-01-07

Abstract

The invention provides a powder metallurgical planetary gear for a high-power starter. The powder metallurgical planetary gear comprises a gear body and a bearing, the gear body is provided with a gear inner hole, the bearing is arranged in the gear inner hole, the end face of the gear body extends to the wall of the gear inner hole through a inclined surface and a cambered surface which are continuous, and the cambered surface projects over the wall of the gear inner hole and is abutted to the edge of the end face of the bearing to stop the bearing from leaving the gear inner hole. The planetary gear solves the problem of insufficient pullout force of a bearing of a planetary gear in the prior art.

Description

A kind of powder metallurgy planetary gear for high-power starter

Technical field

The present invention relates to a kind of planetary pinion, particularly relate to a kind of powder metallurgy planetary gear for high-power starter.

Background technique

At present, conventional motor car engine based on fuel difference is mainly divided into diesel engine and petrol engine.Diesel engine has following pluses and minuses: after diesel engine sprays into fuel, burning needs the regular hour, so be applicable to comparatively allowing under the slow-speed of revolution fuel oil Thorough combustion, thus bring high pulling torque, but in order to resist high pressure in cylinder and high pulling torque, the parts such as the cylinder of diesel engine and the connecting rod of piston are all strong than petrol engine, thus diesel engine comparatively petrol engine is heavier.But, exactly because also diesel engine high-pressure contracting when slow-revving characteristic, heat can be changed into kinetic energy better, so diesel engine has the better thermal efficiency, namely better oil consumption performance.Therefore, the large vehicle such as bus, truck uses diesel engine, and the dilly such as car, racing car uses petrol engine usually.

Powder metallurgy is with metallic dust (or mixture of metallic dust and non-metal powder) as raw material, through being shaped and sintering, manufactures the manufacturing process of metallic material, composite material and all kinds goods.Powder metallurgy have utilization rate of raw materials high (>=95%), low cost of manufacture, material comprehensive good, can the high and advantage such as stable of near-net-shape, Product Precision, also can manufacture material and unmanageable part that conventional casting methods and machining process cannot be prepared.Automobile industry is the maximum power of powder metallurgy industry development and maximum user, and because diesel engine is used for greatly the heavy vehicle such as bus, truck, the power of therefore starter motor requirement is comparatively large, and transmitting torque is also larger.The future development that current automobile starter is little to volume, rotating speed is high, torque is large, gear is the important mechanical component transmitting motion and power in automobile starter.Along with the New Technologies In Powder Metallu Rgy such as high temperature sintering, repressing and re-sintering, powder metal forging, hot isostatic pressing, warm-pressing technology, fast compacting continues to bring out, the density of P/m Iron Base structural member is more and more higher, thus make the gap of its mechanical property and casting or forging and molding product more and more less, therefore, the gear in automobile starter is more and more uses powder metallurgical technique.

But there is bearing and deviate from hypodynamic problem in the planetary pinion of preparation at present, even can deviate from some rugged environment lower bearing, thus generation accident.

Summary of the invention

The invention provides a kind of powder metallurgy planetary gear for high-power starter, deviate from hypodynamic technical problem to solve current planetary gear bearing.

For solving the problems of the technologies described above, the invention provides a kind of powder metallurgy planetary gear for high-power starter, comprise gear and bearing, described gear has bore, and described bearing is arranged in described bore, and the end face of described gear extends to bore wall by inclined-plane and arc shaped surface, inclined-plane and arc shaped surface continuous, described arc shaped surface protrudes bore wall, keeps out the end face edge of bearing, stops that bearing is deviate from from bore.Described arc shaped surface protrudes bore wall 0.5 ~ 0.8mm.

The invention has the beneficial effects as follows: the end face of gear extends to bore wall by inclined-plane and arc shaped surface, and arc shaped surface protrusion bore wall stops that bearing is deviate from from bore, so, bearing is made firmly to be arranged in bore, thus significantly improve bearing deviate from power, deviate to avoid bearing in the presence of a harsh environment.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

Figure 1 shows that the planetary schematic diagram according to present pre-ferred embodiments;

Figure 2 shows that the generalized section of the A of region shown in Fig. 1.

Embodiment

Figure 1 shows that the planetary schematic diagram according to present pre-ferred embodiments.Figure 2 shows that the generalized section of the A of region shown in Fig. 1.Please also refer to Fig. 1 and Fig. 2.

In the present embodiment, powder metallurgy planetary gear for high-power starter comprises gear 1 and bearing 2, gear 1 has bore 10, bearing 2 is arranged in bore 10, the end face of gear 1 extends to bore wall by inclined-plane 100 and arc shaped surface 101, and continuously, arc shaped surface 101 protrudes bore wall 0.5mm for inclined-plane 100 and arc shaped surface 101, keep out the end face edge of bearing 2, stop that bearing 2 is deviate from from bore 10.

In the present embodiment, gear 1 can make arc shaped surface 101 extend to bore wall smoothly by inclined-plane 100, thus avoids bearing 2 cannot enter the problem of bore 10 due to the existence of arc shaped surface 101.

Specifically, the end face of gear 1 extends to the inwall of bore 10 by continuous print inclined-plane 100 and arc shaped surface 101 in the opening of bore 10, the end face edge of bearing 2 is resisted against arc shaped surface 101, deviates from from bore 10 to avoid bearing 2.In addition, bearing 2 and bore 10 rounded, inclined-plane 100 and arc shaped surface 101 are in circular.

In the present embodiment, as shown in Figure 2, when bearing 2 is arranged at bore 10, arc shaped surface 101 can block the end face edge place of bearing 2, thus on the basis of bore inwall and bearing sidewall friction power, is that bearing increases end face barrier force, so, the power of deviating from of bearing 2 is made significantly to promote.In this, at the another one opening of bore 10, another end face of gear 1 extends to the inwall of bore 10 too by inclined-plane and arc shaped surface, so, for the both sides of bearing all increase end face barrier force, avoid the problem that bearing is deviate from better.

In the present embodiment, select Hai Genashi high density adhesive powder as raw material, heating die compaction is carried out to described raw material, to improve shaping density (such as, shaping density can reach more than 7.4), afterwards again by the heat treatment process such as atmosphere sintering and carburizing quenching process, to improve intensity, thus obtain the planetary pinion of high density and high strength.But the present invention is not limited to described raw material, in other embodiments, the high density adhesive powder that other Ni content are higher also can be adopted as required as raw material.

In addition, the planetary pinion that the present embodiment provides can have following performance index: density >=7.3g/cm3; Profile of tooth intensity > 22000N; Power > 2500N deviate from by bearing; Hardness > HRA70.In addition, also have preferably shock resistance height, such as, do the test of shock resistance height, from 5cm, increase 5cm until 50cm at every turn under 1kg gravity, planetary pinion is after experiment all without damage.

In sum, the end face of gear extends to bore wall by inclined-plane and arc shaped surface, and arc shaped surface protrusion bore wall stops that bearing is deviate from from bore, so, bearing is made firmly to be arranged in bore, thus significantly improve bearing deviate from power, deviate to avoid bearing in the presence of a harsh environment.

Above-described embodiment does not limit the present invention in any way, and the technological scheme that the mode that every employing is equal to replacement or equivalent transformation obtains all drops in protection scope of the present invention.

Claims

1. the powder metallurgy planetary gear for high-power starter, comprise gear and bearing, described gear has bore, described bearing is arranged in described bore, it is characterized in that: the end face of described gear extends to bore wall by inclined-plane and arc shaped surface, continuously, described arc shaped surface protrudes bore wall for inclined-plane and arc shaped surface, keep out the end face edge of bearing, stop that bearing is deviate from from bore.

2. a kind of powder metallurgy planetary gear for high-power starter according to claim 1, is characterized in that: described arc shaped surface protrudes bore wall 0.5 ~ 0.8mm.