Gear box input shaft assembly, method, gear box and electric drive transmission system

Abstract

The invention relates to a gear box input shaft assembly and method, a gear box and an electric drive transmission system.The gear box input shaft assembly comprises an input shaft, a motor side bearing is arranged at one end of the input shaft, an end cover side bearing is arranged at the other end of the input shaft, a gear is further arranged on the input shaft, and a splash oil supply component is installed on the input shaft section between the gear and the motor side bearing; the splashing oil supply component comprises a shaft sleeve fixedly connected with the input shaft in a sleeved mode, a plurality of oil collecting and splashing blades are arranged on the outer surface of the shaft sleeve in the annular direction, the oil collecting and splashing blades are of triangular prism structures, the narrow ends of the oil collecting and splashing blades face a motor side bearing, and oil baffles are arranged on the outer side faces of the oil collecting and splashing blades and are conical face plates. The large end of the conical surface where the oil baffle plate is located faces the motor side bearing, and the tip of the conical surface is located on the axis of the input shaft. The input shaft assembly is good in bearing cooling and lubricating effect.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a gearbox input shaft assembly, a method, a gearbox, and an electric drive transmission system. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The existing gearboxes that use splash lubrication rely on the oil guide structure of the inner wall of the housing and the stirring and splashing of the gears for lubrication and heat dissipation of the internal bearings. The flow and splashing of most lubricating oils are non-directional, and the bearings cannot be effectively and reasonably lubricated and cooled. In addition, when the bearings are in a state of high-speed rotation, the air curtain effect produced prevents the low-speed oil from entering the lubrication area. Especially in the electric drive transmission system, the heat dissipation of the motor side bearing is the most difficult, for the following reasons: First, the bearing is a high-speed bearing with an obvious air curtain effect, making it difficult for the lubricating oil to enter; second, under high-speed and high-power conditions, the heat generated is large; third, the bearing is in the core position of the electric drive system, far away from the outer wall, so heat is more likely to accumulate, the temperature is higher, and the lubrication performance of the lubricating oil at high temperatures decreases significantly.

[0004] For example, the Chinese invention patent with the technical application number 202310039749.6 disclosed a splash plate and a pressurized splash lubrication device using the splash plate on January 13, 2023. The patent uses a splash plate with an annular groove and an opening in the groove to increase the speed of the oil flying away laterally and improve the lubrication efficiency of the bearing. For example, the Chinese invention patent with the technical application number 202211008844.1 disclosed a helicopter main reducer splash lubrication system on August 22, 2023, which is provided with a splash plate installed on the rotor shaft, driven by the rotor shaft to rotate, and the oil flowing from the oil pump assembly to the upper surface of the splash plate is splashed to the top bearing lubrication area. There is no structure to enhance the lateral oil splash in the high-power electric drive transmission gearbox using splash lubrication, and the bearing cannot be effectively and reasonably lubricated and dissipated. Moreover, the splash lubrication structure in the existing gearbox collects the oil in the oil pool and splashes it out laterally, and cannot collect the free oil in the cavity above the oil pool and splash it laterally. However, the motor-side bearing of the high-speed shaft of the electric drive transmission system is far away from the oil pool, and due to its compact structural layout, it is impossible to collect the oil in the oil pool for lateral splashing, which leads to poor lubrication and heat dissipation of the motor-side bearing. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a gearbox input shaft assembly, method, gearbox, and electric drive transmission system, which have good heat dissipation and lubrication effects on the bearings.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a gearbox input shaft assembly, including an input shaft, one end of the input shaft is provided with a motor side bearing, the other end is provided with an end cover side bearing, a gear is also provided on the input shaft, and a splash oil supply component is installed on the input shaft section between the gear and the motor side bearing. The splash oil supply component includes a sleeve fixedly connected to the input shaft, and a plurality of oil-collecting splash blades are annularly arranged on the outer surface of the sleeve. The oil-collecting splash blade adopts a triangular prism structure, and its narrow end is arranged toward the motor side bearing. An oil baffle plate is provided on the outer side surface of the oil-collecting splash blade, and the oil baffle plate adopts a conical panel. The large end of the conical surface where the oil baffle plate is located is arranged toward the motor side bearing and the tip of the conical surface is located on the axis of the input shaft.

[0008] Optionally, a plurality of the oil-splash collecting blades are arranged at equal intervals along the circumferential direction of the shaft sleeve.

[0009] Optionally, the width of the wide end of the oil splash collecting blade is equal to the width of the end of the oil baffle plate away from the motor side bearing.

[0010] Optionally, a retaining ring fixed on the input shaft is provided on the side of the motor-side bearing facing the gear, and the axial length of the sleeve is equal to half of the distance between the retaining ring and the gear.

[0011] Optionally, the distance between one side of the sleeve and the retaining ring is equal to one quarter of the distance between the retaining ring and the gear, and the distance between the other side of the bearing and the gear is equal to one quarter of the distance between the retaining ring and the gear.

[0012] Optionally, the half angle of the cone top section of the conical surface where the oil baffle is located is 17°.

[0013] Optionally, the side length of the wide end of the oil-collecting splash vane is equal to one eighth of the input shaft diameter.

[0014] In the second aspect, an embodiment of the present invention provides a working method of the gearbox input shaft assembly described in the first aspect: the splash oil supply component rotates synchronously with the input shaft, and the oil collecting splash blades capture the oil micro-clusters in the surrounding area under the action of rotation so that the oil micro-clusters are adsorbed on the surface of the oil collecting splash blades. Under the action of rotation, the oil collecting splash blades subject the oil micro-clusters on their surface to thrust toward the motor side bearing and radial centrifugal force, driving the oil micro-clusters to move to the inner side of the oil baffle plate with an initial velocity toward the motor side bearing, and the oil baffle plate rotates with the input shaft so that the oil micro-clusters are directionally splashed along the oil baffle plate toward the motor side bearing.

[0015] In a third aspect, an embodiment of the present invention provides a gearbox provided with the gearbox input shaft assembly described in the first aspect.

[0016] In a fourth aspect, an embodiment of the present invention provides an electric drive transmission system, which is provided with the gearbox described in the third aspect.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The gearbox input shaft assembly of the present invention is provided with a splash oil supply component, which is fixedly connected to the input shaft through a shaft sleeve and can rotate with the input shaft, so as to utilize the oil collecting splash blades to capture oil micro-clusters in the space around them. Since the oil collecting splash blades are of a triangular prism structure with the narrow end facing the motor side bearing, the oil collecting splash blades can generate axial force and radial centrifugal force toward the motor side bearing on the captured oil micro-clusters, so that the oil micro-clusters can be directed to splash toward the motor side bearing along the inclination direction of the oil baffle plate after moving to the surface of the oil baffle plate, which is conducive to the oil to overcome the air curtain effect and enter the lubrication area of ​​the bearing, thereby improving the lubrication and cooling effect of the motor side bearing, and the bearing can be effectively and more reasonably lubricated and dissipated.

[0019] 2. The gearbox input shaft assembly of the present invention only needs to add a splash oil supply component to the input shaft, without providing additional power, collecting oil from the oil pool or adding an oil pump. The improvement is convenient and simple, has a wide range of applications, and saves improvement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a splash oil supply component according to Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the design of the splash oil supply component of Example 1 of the present invention;

[0024] Among them, 1. input shaft, 2. motor side bearing, 3. splash oil supply component, 4. gear, 5. end cover side bearing, 6. retaining ring;

[0025] 3-1. Shaft sleeve, 3-2. Oil splash collecting blade, 3-3. Oil baffle. DETAILED DESCRIPTION

[0026] Example 1

[0027] This embodiment provides a gearbox input shaft assembly, such as Figure 1As shown, it includes an input shaft 1, one end of the input shaft 1 is connected to a motor side bearing 2, and the other end is connected to an end cover side bearing 5. A gear 4 is also installed on the input shaft 1, and the gear is arranged close to the end cover side bearing 5. A retaining ring 6 is provided on the side of the motor side bearing 2 close to the gear. The retaining ring 6 is fixed to the input shaft 1, and the retaining ring 6 contacts the inner ring of the motor side bearing 2 to axially limit the motor side bearing 2. The above structure can adopt the structure of the input shaft assembly in the gear box, and its further technical details are not described in detail here. In this embodiment, the input shaft assembly of the current gear box is improved.

[0028] In this embodiment, a splash oil supply component 3 is installed on the input shaft, and the splash oil supply component 3 is arranged between the retaining ring 6 and the gear 4 .

[0029] like Figure 2 As shown, the splash oil supply component includes a sleeve 3 - 1 , which is sleeved on the outer periphery of the input shaft 1 and fixedly connected to the input shaft 1 , so that the entire splash oil supply component 3 can rotate synchronously with the input shaft 1 .

[0030] The outer peripheral surface of the shaft sleeve 3-1 is provided with a plurality of oil-collecting splash blades 3-2 along the circumferential direction. Preferably, the plurality of oil-collecting splash blades 3-2 are evenly spaced along the circumferential direction of the shaft sleeve 3-1.

[0031] The oil-collecting splash blade 3-2 adopts a triangular prism structure with a narrow end and a wide end. The narrow end of the oil-collecting splash blade 3-2 is arranged toward the motor side bearing 2, and the bottom surface of the oil-collecting splash blade 3-2 is fixed to the outer peripheral surface of the sleeve 3-1, and its top surface is fixed to the inner surface of the oil baffle plate 3-3. The oil baffle plate 3-3 is a conical panel, and the plane on which it is located is a conical surface, and the large end of the conical surface is arranged toward the motor side bearing 2, and its vertex is located on the axis of the input shaft 1, that is, the surface on which the oil baffle plate 3-3 is located is a conical surface of a cone with L as the generatrix and A as the vertex. The oil baffle plate 3-3 adopts a conical panel, which can reduce the air resistance during rotation.

[0032] In this embodiment, the size of the oil baffle plate 3-3 along the axial direction of the sleeve 3-1 is equal to the size of the oil collecting splash blade 3-2 along the axial direction of the sleeve 3-1, and along the axial direction of the sleeve 3-1, the oil baffle plate 3-3 is flush with the end portion on the same side of the oil collecting splash blade 3-2, and the side length S of the wide end of the oil collecting splash blade 3-2 is the same as the width of the oil baffle plate 3-3.

[0033] The splash oil supply component of this embodiment is designed as follows Figure 3 As shown:

[0034] First determine the point where the oil falls on the bearing rollers: Figure 3 As shown, assuming that the splash enters the radial opening annular section H 1 H 2The oil in the area is the effective lubricating oil of the bearing. The oil splashes straightly and lands at point P. Under the action of the roller's rotation and revolution, the oil splashes along the roller surface from Q 1 To Q 2 The centrifugal force on the surface oil gradually increases, that is, the roller surface oil has a centrifugal force from Q 1 To Q 2 The oil splashes and lands at Q 1 It is better to be above the horizontal line where point P is located. Because the oil micro-groups are affected by gravity and air resistance during splashing, their movement trajectory is not a straight line. The splashing point of the oil is a certain area above and below point P, so Q is selected. 1 The horizontal position of the point is 2 The middle of the horizontal position of the point, that is, 3 / 4H 1 H 2 The position is where the oil splashes and lands at point P.

[0035] Among them, H 2 Point is the contact point between the roller and the edge of the bearing outer ring, H 1 Point is the contact point between the roller and the edge of the inner ring of the bearing, Q 1 Q is the intersection of a straight line passing through the center of the roller and parallel to the axis of the input shaft and the end of the roller near the end cover side bearing 5, 2 It is the intersection point of the roller and the center of the inner annular surface of the bearing outer ring.

[0036] Define the axial dimension of the sleeve 3-1 as B. The length B of the sleeve 3-1 is an important parameter that affects the oil collection efficiency of the oil splash blade. The larger the B value, the higher the oil collection efficiency. However, considering that the distance from the gear 4 is too small, the oil density near the cross section of the gear 4 will be reduced, affecting the heat dissipation of the gear. The length of parameter B is selected as L. A To L B Half the length, select 1 / 4L for position A L B To 3 / 4L A L B area.

[0037] Therefore, the axial length of the sleeve 3-1 is equal to half of the distance between the retaining ring 6 and the gear 4, the distance between one side of the sleeve 3-1 and the retaining ring 6 is equal to one quarter of the distance between the retaining ring 6 and the gear 4, and the distance between the other side of the sleeve 3-1 and the gear 4 is equal to one quarter of the distance between the retaining ring 6 and the gear 4.

[0038] The half angle of the cone top section of the conical surface where the oil baffle plate 3-3 is located is θ.

[0039] Parameter θ and the position of point A at the top of the cone are determined: the position of point A at the top of the cone and the half angle θ of the cone top section jointly affect the height H of the end of the oil collection splash blade 3-2 toward the motor side bearing 2. The larger the H value, the larger the cross-section of the oil collection splash blade 3-2, and the higher the oil collection efficiency. Based on the length and installation position of parameter B, the position of A is determined to be at A. 2 A 2 The point where the straight line passing through the intersection point of the gear 4 and the input shaft 1 and point P intersects the axis of the input shaft is determined to be θ=17°.

[0040] Determination of the side length S of the wide end of the oil splash blade 3-2: The axial inclination of the radial surface of the oil splash blade 3-2 is the main factor affecting the lateral splash velocity of the oil. The greater the inclination, the greater the lateral splash velocity of the oil. The inclination is represented by E, and E = S / 2B. However, if S is too large, the amount of lateral splash oil passing through the gear 4 will be reduced, and the amount of oil captured by the oil splash blade 3-2 will be reduced. Considering all factors, the side length S of the wide end of the oil splash blade 3-2 is taken as one eighth of the diameter of the input shaft 1.

[0041] The remaining structure of the input shaft assembly can be based on existing technologies and will not be described in detail here.

[0042] Example 2

[0043] This embodiment provides a working method of the gearbox input shaft assembly described in Embodiment 1: when the electric drive transmission system rotates at high speed, the space between the gear 4 and the motor-side bearing 2 is filled with a large number of free oil particles. The splash oil supply component 3 rotates synchronously with the input shaft 1. The oil collecting splash blade 3-2 captures the oil micro-clusters in the surrounding area under the action of rotation so that the oil micro-clusters are adsorbed on the surface of the oil collecting splash blade. In this embodiment, the oil collecting splash blade 3-2 forms two cross-arranged side surfaces (radial surfaces) at the narrow end to capture the oil micro-clusters. Since the oil collecting splash blade 3-2 is a triangular prism structure, the oil collecting splash blade 3-2 is rotated, and the oil micro-clusters on its surface are subjected to thrust toward the motor side bearing 2 and radial centrifugal force. The oil micro-clusters generate acceleration and radial acceleration toward the motor side bearing 2. The oil micro-clusters move to the inner side of the oil baffle plate 3-3 under the action of the force and have an initial velocity toward the motor side bearing 2. The oil baffle plate 3-3 rotates with the input shaft 1 so that the oil micro-clusters are directionally splashed along the oil baffle plate 3-3 toward the motor side bearing 2.

[0044] In the input shaft assembly and working method of this embodiment, after the oil particles move to the surface of the oil baffle plate, they can be directed to splash toward the motor side bearing along the tilt direction of the oil baffle plate 3-3, which is conducive to the oil entering the lubrication area of ​​the bearing, improving the lubrication and cooling effect of the motor side bearing, and the bearing can be effectively and more reasonably lubricated and heat-dissipated. Moreover, it is only necessary to add a splash oil supply component to the input shaft, without providing additional power, collecting oil from the oil pool or adding an oil pump, which is convenient and simple to improve, has a wide range of applications, and saves improvement costs.

[0045] Example 3

[0046] This embodiment provides a gearbox, which is provided with the gearbox input shaft assembly described in Embodiment 1. The remaining structure of the gearbox can adopt the existing technology and will not be described in detail here.

[0047] Example 4

[0048] This embodiment provides an electric drive transmission system, which is provided with the gear box described in Example 3. The remaining structure of the electric drive transmission system can adopt the existing technology and will not be described in detail here.

[0049] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gearbox input shaft assembly, comprising an input shaft, one end of the input shaft being provided with a motor side bearing, the other end being provided with an end cover side bearing, and a gear being provided on the input shaft, characterized in that: The input shaft section between the gear and the motor side bearing is installed with a splash oil supply component, which includes a sleeve fixed to the input shaft, and a plurality of oil-collecting splash blades are arranged along the circumferential direction on the outer surface of the sleeve. The oil-collecting splash blades adopt a triangular prism structure, and their narrow ends are arranged toward the motor side bearings. An oil baffle is provided on the outer side of the oil-collecting splash blades, and the oil baffle adopts a conical panel. The large end of the conical surface where the oil baffle is located is arranged toward the motor side bearing and the tip of the conical surface is located on the axis of the input shaft.

2. A gearbox input shaft assembly according to claim 1, characterized in that: The plurality of oil splash collecting blades are arranged at equal intervals along the circumferential direction of the shaft sleeve.

3. The gearbox input shaft assembly according to claim 1, characterized in that: The width of the wide end of the oil splash collecting blade is equal to the width of the end of the oil baffle away from the motor side bearing.

4. The gearbox input shaft assembly according to claim 1, wherein: A retaining ring fixed on the input shaft is provided on the side of the motor-side bearing facing the gear, and the axial length of the sleeve is equal to half of the distance between the retaining ring and the gear.

5. The gearbox input shaft assembly according to claim 4, characterized in that: The distance between one side of the sleeve and the retaining ring is equal to one quarter of the distance between the retaining ring and the gear, and the distance between the other side of the bearing and the gear is equal to one quarter of the distance between the retaining ring and the gear.

6. The gearbox input shaft assembly according to claim 1, characterized in that: The half angle of the cone top section of the conical surface where the oil baffle is located is 17°.

7. The gearbox input shaft assembly according to claim 1, characterized in that: The side length of the wide end of the oil-collecting splash vane is equal to one eighth of the input shaft diameter.

8. A method for operating the gearbox input shaft assembly according to any one of claims 1 to 7, characterized in that: The splash oil supply component rotates synchronously with the input shaft. Under the action of rotation, the oil splash collecting blades capture the oil micro-clusters in the surrounding area so that the oil micro-clusters are adsorbed on the surface of the oil splash collecting blades. Under the action of rotation, the oil splash collecting blades subject the oil micro-clusters on their surface to thrust toward the motor side bearings and radial centrifugal force, driving the oil micro-clusters to move to the inner side of the oil baffle plate with an initial velocity toward the motor side bearings. The oil baffle plate rotates with the input shaft so that the oil micro-clusters are directionally splashed along the oil baffle plate toward the motor side bearings.

9. A gear box, characterized in that: A gearbox input shaft assembly according to any one of claims 1 to 7 is provided.

10. An electric drive transmission system, characterized in that: A gear box according to claim 9 is provided.

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