WO2023279591A1 - 一种油冷空心转轴结构以及油冷转子结构 - Google Patents

一种油冷空心转轴结构以及油冷转子结构 Download PDF

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Publication number
WO2023279591A1
WO2023279591A1 PCT/CN2021/127367 CN2021127367W WO2023279591A1 WO 2023279591 A1 WO2023279591 A1 WO 2023279591A1 CN 2021127367 W CN2021127367 W CN 2021127367W WO 2023279591 A1 WO2023279591 A1 WO 2023279591A1
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Prior art keywords
oil
shaft body
shaft
passage
hole
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PCT/CN2021/127367
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English (en)
French (fr)
Inventor
范佳伦
程勇
顾杰
李跃华
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合肥巨一动力系统有限公司
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Application filed by 合肥巨一动力系统有限公司 filed Critical 合肥巨一动力系统有限公司
Priority to DE112021007923.9T priority Critical patent/DE112021007923T5/de
Publication of WO2023279591A1 publication Critical patent/WO2023279591A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
    • F16H57/0417—Heat exchangers adapted or integrated in the gearing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention belongs to the technical field of motors, and in particular relates to an oil-cooled hollow shaft structure and an oil-cooled rotor structure.
  • the heat dissipation requirements for the motor are gradually increasing, and the heat dissipation method of the motor has also changed accordingly. It is a widely used solution to directly cool and dissipate the heat-generating parts of the motor through cooling oil.
  • the common oil circuit forms of oil-cooled motors are as follows: After the external oil enters the motor, the first oil circuit is introduced into the casing, and passes through the casing.
  • the first oil circuit or oil injection hole cools the stator core and the end winding; the second oil circuit enters the internal oil circuit of the hollow shaft through the oil circuit on the end cover, and then enters the internal oil circuit of the rotor, thereby cooling the rotor core and magnetic
  • the steel is cooled, and at the same time, the oil coming out of the rotor can be splashed on the inner side of the wire bag at the end to cool the wire bag.
  • using the inner cavity of the hollow shaft as a part of the oil circuit is the mainstream structure. Its typical structure is shown in Figure 1.
  • the cooling oil enters the inner cavity of the rotating shaft from one end of the rotating shaft, collects inside the cavity, and then passes through the rotating shaft under the action of high-speed centrifugal force.
  • the radial hole enters the oil circuit inside the iron core to achieve cooling of the rotor, but this structure has the following disadvantages: if it only meets the needs of oil delivery, a small cavity is opened, the weight of the rotor is large, and the lightweight design cannot be achieved Requirements: If a larger cavity is opened in order to meet the lightweight design, a large amount of oil will accumulate inside the rotor; the dynamic unbalance value of the rotor will be increased, and the oil will surge during rotation, resulting in a decrease in NVH performance and increased torque fluctuations. Therefore, there is an urgent need for an oil-cooled hollow shaft structure capable of solving the above problems.
  • the present invention provides an oil-cooled hollow rotating shaft structure, which can minimize the damage caused by the accumulation of oil inside the hollow rotating shaft under the premise of ensuring lightweight design, assembly manufacturability and satisfying oil conduction. question.
  • An oil-cooled hollow shaft structure comprising a first connecting portion and a second connecting portion, the first connecting portion includes a connected first shaft end and a first shaft body, and the second connecting portion includes a connected second shaft end and the second shaft body, the first shaft body and the second shaft body are sealed and connected to form a shaft body, the first connecting part is provided with a blind hole, and the blind hole faces the second shaft body.
  • the second shaft end is provided with a connected oil inlet hole and a first inner cavity
  • the second shaft body is provided with a second inner cavity
  • the second inner cavity and the The first inner cavity is connected
  • the end of the second shaft body is provided with a sealing plug
  • the sealing plug is used to separate the blind cavity and the second inner cavity
  • the shaft body of the rotating shaft is provided with a shaft
  • the axial oil passage communicates with the second inner cavity
  • the axial oil passage is also connected with a first oil passage hole and a second oil passage hole, and the cooling oil passes through the first oil passage The hole and the second oil hole flow out of the shaft body of the rotating shaft.
  • the end of the second shaft body is provided with an annular mounting plate, the annular mounting plate is inserted into the interior of the blind cavity, the sealing plug is bowl-shaped, and the sealing plug is plugged into the annular The interior of the mounting plate is sealed and separated from the second inner cavity from the blind cavity.
  • the inside of the blind cavity is provided with a plurality of elongated and inwardly protruding ridges, and the end of the ridges at the opening of the blind cavity is provided with a fitting stopper, and the first The shaft body and the second shaft body are positioned through the interference fit of the fitting spigot and the annular mounting plate, and then welded into a whole through the circumference.
  • the axial oil passage includes a first oil passage and a second oil passage, the first oil passage is arranged on the protrusion, and the second oil passage is arranged on the second shaft body, There is a one-to-one correspondence between the first oil passage and the second oil passage.
  • the first inner cavity and the second inner cavity form an oil storage cavity.
  • An oil-cooled rotor structure includes the above-mentioned oil-cooled hollow shaft structure.
  • the shaft body is installed at the center of the rotor core, and the side of the rotor core close to the first shaft end is provided with the The first pressure plate, the second pressure plate is provided on the side of the rotor core close to the second shaft end; the first oil guide groove connected with the first oil hole is provided on the outside of the first pressure plate, and the cooling The oil flows into the first oil hole from the axial oil passage, and then flows out through the first oil guide groove; the rotor core is provided with an oil distribution passage, and the inner side of the second pressure plate is provided with a connecting oil groove, The connecting oil groove is used to connect the second oil passage hole with the oil distribution passage, and the inside of the first pressure plate is also provided with a second oil guide groove connected with the oil distribution passage, and the cooling oil flows from the oil distribution passage.
  • the axial oil passage flows into the second oil passage, then flows through the connecting oil groove and the oil distribution passage, and finally flows out through the
  • the second oil guide groove includes a connected main groove body and an oil outlet hole, the main groove body communicates with the oil distribution channel, the oil outlet holes diverge toward the outer peripheral edge, and each of the The oil outlet holes are arranged obliquely along the clockwise or counterclockwise direction.
  • the hollow rotating shaft structure of the present invention includes a first connecting portion and a second connecting portion, a sealing plug is provided at the end of the second shaft body of the second connecting portion, and the sealing plug is used to separate the blind cavity from the second inner cavity, so that the first The first inner cavity and the second inner cavity in the two connecting parts form an oil storage chamber.
  • the present invention can effectively reduce the accumulation of oil in the hollow rotating shaft structure on the premise of ensuring the lightweight design of the rotating shaft structure, which helps to reduce the overall impact on the rotor.
  • the impact of dynamic unbalance can improve NVH performance and reduce torque fluctuation; the present invention can control the size of the oil storage chamber by adjusting the segmental positions of the first shaft body and the second shaft body, so as to meet the needs of different rotor irons.
  • Core oil supply requirements; the present invention is simple in structure, easy to implement, and low in cost.
  • Fig. 1 is a schematic diagram of the structure of the oil-cooled hollow shaft in the prior art
  • Fig. 2 is the schematic diagram of the structure of the oil-cooled hollow shaft in the present invention.
  • Fig. 3 is a schematic diagram of the three-dimensional structure of the first connecting part of the present invention.
  • Fig. 4 is a schematic diagram of a three-dimensional structure of a second connecting part of the present invention.
  • Fig. 5 is a schematic diagram of the structure of the oil-cooled rotor of the present invention.
  • Figure 6 is a schematic diagram of the first platen of the present invention.
  • the marks in the figure are: 1. The first connection part; 11. The first shaft end; 12. The first shaft body; 13. The blind hole cavity; 14. The convex line; 21. Second shaft end; 22. Second shaft body; 23. Oil inlet hole; 24. First inner cavity; 25. Second inner cavity; 26. Seal plug; 27. Ring mounting plate; 3. Axial oil 31, the first oil hole; 32, the second oil hole; 33, the first oil circuit; 34, the second oil circuit; 4, the first pressure plate; 41, the first oil guide groove; 42, the second guide Oil tank; 421, main tank body; 422, oil outlet hole; 5, second pressure plate; 51, connecting oil tank; 6, rotor iron core; 61, oil distribution channel.
  • an oil-cooled hollow shaft structure includes a first connecting part 1 and a second connecting part 2, the first connecting part 1 includes a connected first shaft end 11 and a first shaft body 12, The second connecting part 2 includes a connected second shaft end 21 and a second shaft body 22, the first shaft body 12 and the second shaft body 22 are sealed and connected to form a shaft body, the first shaft end 11 is provided with a spline, and the second shaft body 22 is sealed and connected to form a shaft body.
  • a blind cavity 13 is provided in the connecting part 1, and the blind cavity 13 is open to one side of the second connecting part 2, and the inside of the blind cavity 13 is provided with four elongated and inwardly protruding convex strips 14, The end of the protruding strip 14 located at the opening of the blind cavity 13 is provided with a matching notch 15 .
  • the second shaft end 21 is provided with a connected oil inlet hole 23 and the first inner cavity 24, and the second shaft body 22 is provided with a second inner cavity 25, and the second inner cavity 25 communicates with the first inner cavity 24.
  • the end of the second shaft body 22 is provided with a sealing plug 26 for separating the blind cavity 13 and the second inner cavity 25, the sealing plug 26 is bowl-shaped, and the end of the second shaft body 22 is also provided with an annular mounting plate 27 , the annular mounting plate 27 is inserted into the interior of the blind cavity 13, the sealing plug 26 is inserted into the interior of the annular mounting plate 27, and the second inner cavity 25 is sealed and separated from the blind cavity 13, so that the first inner cavity 24 and the second inner cavity
  • the two inner chambers 25 form an oil storage chamber.
  • the shaft body is provided with an axial oil passage 3, and the axial oil passage 3 communicates with the second inner cavity 25.
  • the axial oil passage 3 is also connected with a first oil passage 31 and a second oil passage 32, and the cooling oil It flows out of the shaft body through the first oil passage 31 and the second oil passage 32.
  • the first connection part 1 and the second connection part 2 can be formed by forging and then rough machining, the first shaft body 12 of the first connection part 1 and the second shaft body 22 of the second connection part 2 are passed through Cooperate with the spigot 15 and the annular mounting plate 27 for interference fit positioning, and each first oil passage 33 and the corresponding second oil passage 34 are aligned and positioned one by one. processing.
  • an oil-cooled rotor structure includes the above-mentioned oil-cooled hollow shaft structure.
  • the oil-cooled rotor structure also includes a first pressure plate 4, a second pressure plate 5, and a rotor core 6.
  • the side of the rotor core 6 close to the first shaft end 11 is provided with a first pressure plate 4
  • the side of the rotor core 6 close to the second shaft end 21 is provided with a second pressure plate 5
  • the outer side of a pressure plate 4 is provided with a first oil guide groove 41 communicating with the first oil passage 31, the cooling oil flows into the first oil passage 31 from the axial oil passage 3, and then flows out through the first oil guide groove 41;
  • the rotor core 6 is provided with an oil distribution passage 61, the inner side of the second pressure plate 5 is provided with a connecting oil groove 51, and the connecting oil groove 51 is used to communicate with the second oil passage 32 and the oil distribution passage 61, and the inner side of the first pressure plate 4 is also provided with a connecting oil
  • the oil passage 61 communicates with the second oil guide groove 42 , the cooling oil flows from the axial oil passage 3 into the second oil passage hole 32 , then flows through the connecting oil groove 51 and the oil distribution passage 61 , and finally flows out through the second oil guide groove 42 .
  • the second oil guide groove 42 includes a main groove body 421 and an oil outlet hole 422 which are connected. Tilt the setting clockwise or counterclockwise.
  • cooling oil enters from the oil inlet hole 23 of the second shaft end 21, gathers in the oil storage chamber, and then enters the axial oil passage 3 of the shaft body under the action of high-speed centrifugal force, and then passes through the second passage
  • the oil hole 32 flows through the connecting oil groove 51 and enters the oil distribution passage 61, and finally flows out through the second oil guide groove 42.
  • the oil distribution passage 61 is in the internal oil passage of the iron core, so as to cool the rotor, and the other part of the cooling oil passes through the first
  • the oil hole 31 enters the first pressure plate 4 and flows out through the first oil guide groove 41 .
  • the present invention can effectively reduce the accumulation of oil inside the hollow rotating shaft structure on the premise of ensuring the lightweight design of the rotating shaft structure, which helps to reduce the impact on the dynamic imbalance of the rotor assembly, thereby improving NVH performance and reducing torque fluctuations; the present invention
  • the size of the oil storage chamber can be controlled by adjusting the segmented positions of the first shaft body 12 and the second shaft body 22, thereby meeting different oil supply requirements of the rotor core 6; the present invention is simple in structure, easy to implement, and low in cost low.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

一种油冷空心转轴结构以及油冷转子结构，油冷空心转轴结构包括第一连接部（1）和第二连接部（2），第一连接部（1）包括相连的第一轴端（11）和第一轴体（12），第二连接部（2）包括相连的第二轴端（21）和第二轴体（22），第一轴体（12）和第二轴体（22）密封连接组成转轴轴体，第一连接部（1）内设有盲孔腔（13），盲孔腔（13）朝向第二连接部（2）一侧开口，第二轴端（21）内设有相连通的进油孔（23）和第一内腔（24），第二轴体（22）内设有第二内腔（25），第二内腔（25）和第一内腔（24）连通，第二轴体（22）端部设有密封塞（26），密封塞（26）分隔盲孔腔（13）和第二内腔（25），转轴轴体上设有轴向油路（3），轴向油路（3）与第二内腔（25）连通，轴向油路（3）连接有第一过油孔（31）和第二过油孔（32），冷却油经第一过油孔（31）和第二过油孔（32）流出转轴轴体。该油冷空心转轴结构以及油冷转子结构能在保证轻量化前提下，有效减少空心转轴结构内部油液聚集。

Description

一种油冷空心转轴结构以及油冷转子结构 技术领域
本发明属于电机技术领域，具体涉及一种油冷空心转轴结构以及油冷转子结构。
背景技术
随着电机功率要求越来越高，对电机的散热要求逐渐提高，电机的散热方式也随之发生了改变。通过冷却油直接对电机发热部件进行冷却散热是一种运用较广的方案，目前油冷电机常见的油路形式如下：外部油进入电机后，第一路油路导入机壳，通过机壳上的油路或喷油孔对定子铁芯和端部绕组进行冷却；第二路油路通过端盖上油路进入空心转轴内部油路，进而进入转子内部油路，从而对转子铁芯和磁钢进行冷却，同时从转子出来的油可以甩淋在端部线包内侧，对线包进行冷却。其中利用空心转轴内部腔体作为油路的一部分是主流结构，其典型结构如图1所示，冷却油从转轴一端进入转轴内部腔体，在腔体内部聚集，然后在高速离心力作用下通过转轴径向孔进入铁芯内部油路，从而达成对转子进行冷却的作用，但是这种结构存在如下缺点：若仅满足输油需要，开较小空腔，转子重量大，达不到轻量化设计要求；若为了满足轻量化设计开较大的空腔，则转子内部大量油液聚集；增大了转子动不平衡值，同时转动时油液涌动，导致NVH性能降低，扭矩波动加大。因此，急需一种能够解决上述问题的油冷空心转轴结构。
发明内容
针对上述存在的技术问题，本发明提供一种油冷空心转轴结构，该转轴结构在保证轻量化设计、装配工艺性和满足导油的前提下，能够尽量减少空心转轴内部油液聚集带来的问题。
本发明的技术方案是：
一种油冷空心转轴结构，包括第一连接部和第二连接部，所述第一连接部包括相连的第一轴端和第一轴体，所述第二连接部包括相连的第二轴端和第二轴体，所述第一轴体和所述第二轴体密封连接组成转轴轴体，所述第一连接部内设有盲孔腔，所述盲孔腔朝向所述第二连接部的一侧开口，所述第二轴端内设有相连通的进油孔和第一内腔，所述第二轴体内设有第二内腔，所述第二内腔和所述第一内腔相连通，所述第二轴体的端部设有密封塞，所述密封塞用于分隔所述盲孔腔和所述第二内腔，所述转轴轴体上设有轴向油路，所述轴向油路与所述第二内腔相连通，所述轴向油路还连接有第一过油孔和第二过油孔，冷却油经所述第一过油孔和所述第二过油孔流出所述转轴轴体。
优选的，所述第二轴体的端部设有环形安装板，所述环形安装板插入到所述盲孔腔的内部，所述密封塞呈碗状，所述密封塞塞入所述环形安装板的内部，并将所述第二内腔与所述盲孔腔密封分隔。
优选的，所述盲孔腔内部设有多个长条状且向内凸出的凸条，位于所述盲孔腔开口处的所述凸条端部设有配合止口，所述第一轴体和所述第二轴体通过所述配合止口和所述环形安装板过盈配合定位，然后通过圆周焊接成一个整体。
优选的，所述轴向油路包括第一油路和第二油路，所述第一油路设置于所述凸条上，所述第二油路设置于所述第二轴体上，所述第一油路和所述第二油路一一对应。
优选的，所述第一内腔和所述第二内腔组成储油腔。
一种油冷转子结构，包括上述油冷空心转轴结构。
优选的，还包括第一压板、第二压板和转子铁芯，所述转轴轴体安装在所述转子铁芯的中心处，所述转子铁芯靠近所述第一轴端的一侧设有所述第一压板，所述转子铁芯靠近所述第二轴端的一侧设有第二压板；所述第一压板外侧设有与所述第一过油孔相连通的第一导油槽，冷却油从所述轴向油路流入所述第一过油孔，然后经所述第一导油槽流出；所述转子铁芯上设有分油道，所述第二压板内侧设有连接油槽，所述连接油槽用于将所述第二过油孔与所述分油道相连通，所述第一压板内侧还设有与所述分油道相连通的第二导油槽，冷却油从所述轴向油路流入所述第二过油孔，然后流经所述连接油槽和所述分油道，最后经所述第二导油槽流出。
优选的，所述第二导油槽包括相连通的主槽体和出油孔，所述主槽体与所述分油道相连通，所述出油孔向外圆周边缘发散，且各个所述出油孔均沿着顺时针或逆时针方向倾斜设置。
本发明的有益效果是：
本发明的空心转轴结构包括第一连接部和第二连接部，第二连接部的第二轴体端部设有密封塞，密封塞用于分隔盲孔腔和第二内腔，从而使得第二连接部内的第一内腔和第二内腔形成储油腔，本发明能够在保证转轴结构轻量化设计的前提下，有效减少空心转轴结构内部油液的聚集，有助于降低对转子总成动不平衡的影响，进而提升NVH性能和降低扭矩波动；本发明能够通过调整第一轴体和第二轴体的分段位置，从而控制储油腔的大小，进而能够满足不同的转子铁芯供油需求；本发明结构简单，易于实现，并且成本低廉。
附图说明
下面结合附图及实施例对本发明作进一步描述：
图1是现有技术中油冷空心转轴结构的示意图；
图2是本发明中油冷空心转轴结构的示意图；
图3是本发明第一连接部的立体结构示意图；
图4是本发明第二连接部的立体结构示意图；
图5是本发明油冷转子结构的示意图；
图6是本发明第一压板的示意图。
图中标记为：1、第一连接部；11、第一轴端；12、第一轴体；13、盲孔腔；14、凸条；15、配合止口；2、第二连接部；21、第二轴端；22、第二轴体；23、进油孔；24、第一内腔；25、第二内腔；26、密封塞；27、环形安装板；3、轴向油路；31、第一过油孔；32、第二过油孔；33、第一油路；34、第二油路；4、第一压板；41、第一导油槽；42、第二导油槽；421、主槽体；422、出油孔；5、第二压板；51、连接油槽；6、转子铁芯；61、分油道。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明了，下面结合具体实施方式并参照附图，对本发明进一步详细说明。应该理解，这些描述只是示例性的，而并非要限制本发明的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要地混淆本发明的概念。
如图2至图3所示，一种油冷空心转轴结构，包括第一连接部1和第二连接部2，第一连接部1包括相连的第一轴端11和第一轴体12，第二连接部2包括相连的第二轴端21和第二轴体22，第一轴体12和第二轴体22密封连接组成转轴轴体，第一轴端11上设有花键，第一连接部1内设有盲孔腔13，盲孔腔13朝向第二连接部2的一侧开口，且盲孔腔13内部设有4个长条状且向内凸出的凸条14，位于盲孔腔13开口处的凸条14端部设有配合止口15。
第二轴端21内设有相连通的进油孔23和第一内腔24，第二轴体22内设有第二内腔25，第二内腔25和第一内腔24相连通，第二轴体22的端部设有用于分隔盲孔腔13和第二内腔25的密封塞26，该密封塞26呈碗状，第二轴体22的端部还设有环形安装板27，环形安装板27插入到盲孔腔13的内部，密封塞26塞入环形安装板27的内部，并将第二内腔25与盲孔腔13密封分隔，从而使得第一内腔24和第二内腔25组成储油腔。
转轴轴体上设有轴向油路3，轴向油路3与第二内腔25相连通，轴向油路3还连接有第一过油孔31和第二过油孔32，冷却油经第一过油孔31和第二过油孔32流出转轴轴体， 该轴向油路3为4条，且每个轴向油路3由第一油路33和第二油路34组成，第一油路33设置于凸条14上，第二油路34设置于第二轴体22上，第一油路33和第二油路34一一对应。
在加工过程中，第一连接部1和第二连接部2可以通过锻压成型，然后进行粗加工，第一连接部1的第一轴体12和第二连接部2的第二轴体22通过配合止口15和环形安装板27过盈配合定位，且各个第一油路33与相应的第二油路34一一对准定位，装配完成后，然后通过圆周焊接成一个整体，最终进行精加工。
如图5和图6所示，一种油冷转子结构，包括上述油冷空心转轴结构，该油冷转子结构还包括第一压板4、第二压板5和转子铁芯6，转轴轴体安装在转子铁芯6的中心处，转子铁芯6靠近第一轴端11的一侧设有第一压板4，转子铁芯6靠近第二轴端21的一侧设有第二压板5；第一压板4外侧设有与第一过油孔31相连通的第一导油槽41，冷却油从轴向油路3流入第一过油孔31，然后经第一导油槽41流出；转子铁芯6上设有分油道61，第二压板5内侧设有连接油槽51，连接油槽51用于将第二过油孔32与分油道61相连通，第一压板4内侧还设有与分油道61相连通的第二导油槽42，冷却油从轴向油路3流入第二过油孔32，然后流经连接油槽51和分油道61，最后经第二导油槽42流出。第二导油槽42包括相连通的主槽体421和出油孔422，主槽体421与分油道61相连通，出油孔422向外圆周边缘发散，且各个出油孔422均沿着顺时针或逆时针方向倾斜设置。
在使用过程中，冷却油从第二轴端21的进油孔23进入，在储油腔内部聚集，然后在高速离心力作用下进入转轴轴体的轴向油路3，然后再通过第二过油孔32流经连接油槽51后进入分油道61，最后经第二导油槽42流出，分油道61在铁芯内部油路，从而达成对转子进行冷却，另一部分冷却油则通过第一过油孔31进入第一压板4，经第一导油槽41流出。
本发明能够在保证转轴结构轻量化设计的前提下，有效减少空心转轴结构内部油液的聚集，有助于降低对转子总成动不平衡的影响，进而提升NVH性能和降低扭矩波动；本发明能够通过调整第一轴体12和第二轴体22的分段位置，从而控制储油腔的大小，进而能够满足不同的转子铁芯6供油需求；本发明结构简单，易于实现，并且成本低廉。
应当理解的是，本发明的上述具体实施方式仅仅用于示例性说明或解释本发明的原理，而不构成对本发明的限制。因此，在不偏离本发明的精神和范围的情况下所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。此外，本发明所附权利要求旨在涵盖落入所附权利要求范围和边界、或者这种范围和边界的等同形式内的全部变化和修改例。

Claims (8)

  1. 一种油冷空心转轴结构，其特征在于，包括第一连接部和第二连接部，所述第一连接部包括相连的第一轴端和第一轴体，所述第二连接部包括相连的第二轴端和第二轴体，所述第一轴体和所述第二轴体密封连接组成转轴轴体，所述第一连接部内设有盲孔腔，所述盲孔腔朝向所述第二连接部的一侧开口，所述第二轴端内设有相连通的进油孔和第一内腔，所述第二轴体内设有第二内腔，所述第二内腔和所述第一内腔相连通，所述第二轴体的端部设有密封塞，所述密封塞用于分隔所述盲孔腔和所述第二内腔，所述转轴轴体上设有轴向油路，所述轴向油路与所述第二内腔相连通，所述轴向油路还连接有第一过油孔和第二过油孔，冷却油经所述第一过油孔和所述第二过油孔流出所述转轴轴体。
  2. 根据权利要求1所述的一种油冷空心转轴结构，其特征在于，所述第二轴体的端部设有环形安装板，所述环形安装板插入到所述盲孔腔的内部，所述密封塞呈碗状，所述密封塞塞入所述环形安装板的内部，并将所述第二内腔与所述盲孔腔密封分隔。
  3. 根据权利要求2所述的一种油冷空心转轴结构，其特征在于，所述盲孔腔内部设有多个长条状且向内凸出的凸条，位于所述盲孔腔开口处的所述凸条端部设有配合止口，所述第一轴体和所述第二轴体通过所述配合止口和所述环形安装板过盈配合定位，然后通过圆周焊接成一个整体。
  4. 根据权利要求3所述的一种油冷空心转轴结构，其特征在于，所述轴向油路包括第一油路和第二油路，所述第一油路设置于所述凸条上，所述第二油路设置于所述第二轴体上，所述第一油路和所述第二油路一一对应。
  5. 根据权利要求1所述的一种油冷空心转轴结构，其特征在于，所述第一内腔和所述第二内腔组成储油腔。
  6. 一种油冷转子结构，其特征在于，包括权利要求1-5任一项所述的油冷空心转轴结构。
  7. 根据权利要求6所述的一种油冷转子结构，其特征在于，还包括第一压板、第二压板和转子铁芯，所述转轴轴体安装在所述转子铁芯的中心处，所述转子铁芯靠近所述第一轴端的一侧设有所述第一压板，所述转子铁芯靠近所述第二轴端的一侧设有第二压板；所述第一压板外侧设有与所述第一过油孔相连通的第一导油槽，冷却油从所述轴向油路流入所述第一过油孔，然后经所述第一导油槽流出；所述转子铁芯上设有分油道，所述第二压板内侧设有连接油槽，所述连接油槽用于将所述第二过油孔与所述分油道相连通，所述第一压板内侧还设有与所述分油道相连通的第二导油槽，冷却油从所述轴向油路流入所述第二过油孔，然后流经所述连接油槽和所述分油道，最后经所述第二导油槽流出。
  8. 根据权利要求7所述的一种油冷转子结构，其特征在于，所述第二导油槽包括相连通 的主槽体和出油孔，所述主槽体与所述分油道相连通，所述出油孔向外圆周边缘发散，且各个所述出油孔均沿着顺时针或逆时针方向倾斜设置。
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