CN111692321A

CN111692321A - N-shaped arranged speed reducer shell for new energy vehicle

Info

Publication number: CN111692321A
Application number: CN202010601554.2A
Authority: CN
Inventors: 黄苏刚; 饶剑文; 唐思成; 邹兵凤; 姜致强
Original assignee: Jiangxi Jiangling Chassis Co Ltd
Current assignee: Jiangxi Jiangling Chassis Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-09-22

Abstract

The invention relates to an N-shaped-arrangement speed reducer shell for a new energy vehicle, which comprises a shell cover and a shell body which are connected with each other, wherein a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are respectively formed in the shell cover and the shell body; the speed reducer shell adopts a split design, so that casting, production and processing of the shell and the shell cover are facilitated, and the assembly of a subsequent gear and a bearing group is facilitated; various oil baffle plates and oil grooves ingeniously designed on the shell and the shell cover ensure the efficient lubrication of the speed reducer when the whole vehicle moves forwards at low-high speed or moves backwards at low speed.

Description

N-shaped arranged speed reducer shell for new energy vehicle

Technical Field

The invention relates to the technical field of speed reducer lubrication for a new energy light truck drive axle, in particular to an N-shaped speed reducer shell for a new energy vehicle, which can effectively solve the hidden trouble of poor lubrication of a gear and a bearing in a speed reducer when a pure electric light truck advances and retreats at a low speed and ensure the use requirements of reliable operation and comfort of the whole vehicle.

Background

With the process of automobile electromotion being increasingly accelerated, the electromotion of a commercial light truck is known as an explosion point of the next market, and a parallel shaft type electric drive axle with a motor directly connected with a speed reducer is generally adopted in the industry. The overall dimension and the weight of a product can be effectively reduced by adopting a larger reduction ratio, so that the centers of all gears in the speed reducer are arranged in an N-shaped posture; the lubrication conditions of the gears and the bearings arranged in the N-shaped posture are different greatly when the gears and the bearings move forwards or backwards, and particularly, the hidden danger of insufficient oil splashing quantity or oil-free lubrication of the gears exists when the whole vehicle runs at a low speed.

Chinese patent application publication No. CN202812153U discloses a gear reducer for a crown block, which is characterized in that: the device comprises a machine body and a machine cover, wherein the machine body is connected with the machine cover, a three-level gear, a hollow shaft and an input shaft which are meshed in parallel are arranged in the machine body, the uppermost end of the input shaft is meshed with the three-level gear, and a third-level gear of the three-level gear is fixed on the hollow shaft; the lubricating device is connected with the oil pouring port through an oil pipe, and is connected with the oil returning port through an oil pipe. The utility model provides a gear reducer for overhead traveling crane, the one end of watering opening in the organism is the shower head, be equipped with small-size oil pump in the lubricating arrangement, the hollow shaft hole is the taper hole, the organism is equipped with a lug outward, and its lug is the footing.

Although the gear reducer is a three-stage speed reducer, the three pairs of gears are arranged in a straight line, and the gears and the bearings are lubricated by pouring oil from top to bottom through an oil pump and an oil pipe which are installed on an input shaft. The gear reducer is wide in appearance, the weight and the cost of the product are increased rapidly due to the installed oil pump and the installed oil pipe, the practicability of the product is greatly reduced, and the design concept of energy conservation and emission reduction of a new energy vehicle is not met.

Chinese patent application publication No. CN208221550U discloses a reduction gear casing, including the casing that is hollow structure, has and accepts the chamber, the casing includes procapsid and back casing, the procapsid with back casing sets up relatively, the procapsid with back casing relative position has set gradually input part, transmission portion and output, oil inlet and oil-out have been seted up to the outer wall of casing, reduction gear casing still includes:

the oil guide wall is accommodated in the accommodating cavity, the edge of the oil guide wall is abutted against the inner wall of the accommodating cavity to form an oil guide cavity, the input part, the transmission part and the output part are positioned in the oil guide cavity, and the oil inlet and the oil outlet are respectively communicated with the oil guide cavity;

the oil guide wall is fixedly connected with the inner wall of the accommodating cavity through a fixing structure, and the density of the oil guide wall is smaller than that of the shell.

The input part, the transmission part and the output part of the speed reducer form a V-shaped arrangement form, and although the shell of the speed reducer has a certain lubricating function, the mechanism is only suitable for the speed reducer with two pairs of gears with small speed ratio and is not suitable for the speed reducer with large speed ratio with three pairs of gears. The reason is that no reducer shell can realize effective lubrication of a large-speed-ratio reducer with three pairs of gears at present, and the lubrication path and the design concept of the whole vehicle during low-speed forward or backward movement are not involved.

The invention aims to provide an N-shaped speed reducer shell for a new energy vehicle, so as to solve the hidden trouble of poor lubrication of a gear and a bearing in a speed reducer when a pure electric light truck advances and retreats at a low speed and ensure the use requirements of reliable operation and comfort of the whole vehicle.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an N-shaped speed reducer shell for a new energy vehicle.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a speed reducer shell for a new energy vehicle in an N-shaped arrangement comprises a shell cover and a shell body which are connected with each other, wherein a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are formed in the shell cover and the shell body respectively;

a first shaft bearing is installed in a first shaft bearing hole, a second shaft bearing is installed in a second shaft bearing hole, a third shaft bearing is installed in a third shaft bearing hole, a differential bearing is installed in a differential bearing hole, a first driving gear is sleeved on the first shaft bearing, a first driven gear is sleeved on the second shaft bearing and connected with a second driving gear, the first driven gear is meshed with the first driving gear, a third driving gear is sleeved on the third shaft bearing and connected with a second driven gear, the second driven gear is meshed with the second driving gear, the third driving gear is meshed with a third driven gear, and the power output end of the third driven gear is connected with a differential assembly.

Further, the shell cover and the shell are designed in a split mode and are connected through a hexagon bolt.

Further, triaxial dead eye, two dead eyes, the dead eye of the first axle in the cap are triangle-shaped and arranges, and the strengthening rib that the dead eye of the first axle set up bottom the dead eye of the third axle provides the oil storage chamber for the bearing, sets up the V-arrangement oil baffle at a band angle of inclination directly over the dead eye of the first axle, and V-arrangement oil baffle bottom sets up a dark oil groove, collects the gear oil that splashes at a high speed of gear and via the leading-in and lubricated first axle bearing of dark oil groove.

Furthermore, an inclined oil groove is arranged above the side of the triaxial bearing hole, the other end of the oil groove is positioned at the mounting surface of the shell cover and the shell, and gear oil collected by the shell is guided into the triaxial bearing hole under the low-high speed condition to lubricate the triaxial bearing.

Furthermore, a diamond-shaped open oil groove with a cross section is obliquely and downwards arranged between the three-shaft bearing hole and the one-shaft bearing hole, the diamond-shaped open oil groove naturally guides gear oil at the three-shaft bearing hole into the one-shaft bearing hole, collects gear oil adhered to the upper side of the open oil groove and guides the gear oil into the one-shaft bearing hole, and hidden danger that an oil collecting effect of a V-shaped oil baffle plate above the lower-speed one-shaft bearing hole is weak or even invalid is supplemented.

Furthermore, also be equipped with triaxial dead eye, two dead eyes and one shaft dead eye on the casing, triaxial dead eye, two dead eyes and one shaft dead eye are triangle-shaped in the casing and arrange, and the strengthening rib that triaxial dead eye bottom set up provides the oil storage chamber for the bearing.

Furthermore, an inclined V-shaped oil baffle plate is arranged right above a bearing hole of a shaft in the shell, and a dark oil groove is arranged at the bottom of the V-shaped oil baffle plate; a step-shaped L-shaped oil baffle plate with an inclined angle is arranged above the side of the triaxial bearing hole, and an inclined oil groove is arranged at the bottom of the L-shaped oil baffle plate so as to collect and guide gear oil adhered or splashed by the three-stage driven gear under low-high speed into the triaxial bearing hole;

a hidden oil groove is obliquely and downwards arranged between the three-shaft bearing hole and the first shaft bearing hole, gear oil at the three-shaft bearing hole is naturally guided into the first shaft bearing hole by the hidden oil groove, and the hidden danger that the oil collecting effect of the V-shaped oil baffle plate above the low-speed next shaft bearing hole is weak or even ineffective is supplemented.

Furthermore, the area of the shell above the differential assembly is provided with a double-V-shaped oil baffle plate which has an inclination angle and is distributed up and down, the double-V-shaped oil baffle plate comprises an upper oil baffle plate and a lower oil baffle plate, the bottom of the upper oil baffle plate is provided with a through hole, so that oil collected by the upper oil baffle plate can be led into the lower oil baffle plate, the lateral side of the lower bottom of the double-V-shaped oil baffle plate is provided with a downward-inclined blind oil groove, the other end of the blind oil groove is positioned on the mounting surface of the shell and the shell cover, and gear oil collected by the double-V-shaped oil baffle plate at low-high speed is led into a triaxial bearing hole of the shell cover through the shell cover blind oil groove.

Furthermore, the space between the stepped L-shaped oil baffle and the adjacent gear is set to be 5mm in the state that the gears are assembled on the double-V-shaped oil baffle, and when the gears at all levels rotate reversely at low speed, gear oil is extruded into the oil baffles under the oil pumping action of the gears, so that the reliable lubrication of bearings in the reduction gearbox when the whole vehicle retreats is ensured.

Further, when the speed reducer case is assembled:

s1, pressing and installing outer rings of the first shaft bearing, the second shaft bearing and the third shaft bearing into corresponding bearing holes of the shell cover;

s2, further sequentially pressing and installing the oil seal and the outer rings of the first shaft bearing, the second shaft bearing, the third shaft bearing and the differential bearing into corresponding mounting holes of the shell;

s3, further pressing the inner ring with roller assemblies of the pair of shaft bearings on the primary driving gear; assembling a primary driven gear to a secondary driving gear, and pressing an inner ring with roller assembly of a pair of two-shaft bearings on the secondary driving gear; assembling a secondary driven gear to a tertiary driving gear, and pressing an inner ring with roller assembly of a pair of three-shaft bearings on the tertiary driving gear;

s4, further sequentially placing the components of the pressed gear and the bearing into a shell of the pressed bearing outer ring;

s5, further covering the shell cover with the bearing outer ring in a press fit mode with the shell, and connecting and fastening the shell cover and the shell through a plurality of hexagon head bolts;

s6, further connecting the three-stage driven gear with the differential assembly through a hexagon head bolt, and then pressing the three-stage driven gear into an inner ring belt roller assembly of the differential bearing;

s7, further placing the differential assembly with the assembled gear and bearing into a shell, covering a bearing cover tightly and fastening by using a bearing cover bolt; and assembling the reducer assembly.

The invention has the beneficial effects that: the speed reducer shell adopts a split design, so that casting, production and processing of the shell and the shell cover are facilitated, and the assembly of a subsequent gear and a bearing group is facilitated; various oil baffle plates and oil grooves ingeniously designed on the shell and the shell cover ensure the efficient lubrication of the speed reducer when the whole vehicle moves forwards at low-high speed or moves backwards at low speed; the reliable operation of new forms of energy car and the user demand of travelling comfort are guaranteed.

Compared with the prior art, in the patent with publication number CN202812153U, three pairs of gears of the speed reducer are arranged in a straight line shape, the gears and the bearings are lubricated by additionally mounting an oil pump and an oil pipe on the input shaft for pouring oil up and down, and the product does not have a differential function; in the patent of CN208221550U, two pairs of gears of the speed reducer are arranged in a V shape, the number of gears and bearings required to be lubricated is less, and the used differential has weak impact resistance and is not suitable for the use working condition that a new energy vehicle is frequently and rapidly accelerated and decelerated; the invention relates to a speed reducer in which three pairs of gears are arranged in an N shape, and the technical creativity is as follows: 1. the distance between each pair of gears is small and compact, so that a plurality of parts need to be lubricated and the lubricating condition is poor; 2. according to different positions of each bearing and each gear, an L-shaped oil baffle plate, a V-shaped oil baffle plate and a double-V-shaped oil baffle plate are respectively designed on a shell and a shell cover to collect gear oil; 3. the open oil groove with a rhombic cross section is designed at the shell cover and can be used as additional lubrication supplement for a bearing at the end of the shell cover; 4. the designed oil baffle plates are 5mm away from the adjacent gears in the assembled state, so that effective lubrication during low-speed forward or backward movement of the whole vehicle can be guaranteed.

Drawings

FIG. 1 is a schematic illustration of a retarder assembly;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a side view of the cover;

FIG. 4 is a schematic view of the direction of gear oil flow when the cover is in a forward operating condition;

FIG. 5 is a schematic view of the direction of gear oil flow when the housing cover is in a reverse operating condition;

FIG. 6 is a side view of the housing;

FIG. 7 is a schematic representation of the gear oil flow direction of the housing in a forward condition;

FIG. 8 is a schematic representation of the gear oil flow direction for the case in the reverse condition;

FIG. 9 is a schematic view showing the direction of oil flow to the gear at the end of the housing connected to the cover.

Detailed Description

As shown in fig. 1 and 2, the N-shaped speed reducer housing for the new energy vehicle comprises a housing cover 1 and a housing 2 which are connected with each other, wherein a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are respectively formed in the housing cover 1 and the housing 2, a differential assembly 8 is installed on one side of the housing 2, the differential assembly 8 is provided with a differential bearing hole, and a differential bearing 9, a bearing cover 10 and a bearing cover bolt 11 are arranged on the differential assembly 8;

the bearing hole of the differential mechanism and the circle center connecting lines of the three-shaft bearing hole, the two-shaft bearing hole and the one-shaft bearing hole on the shell cover 1 form an N-shaped structure from a side view angle; the bearing hole of the differential mechanism and the circle center connecting line of the three-shaft bearing hole, the two-shaft bearing hole and the one-shaft bearing hole on the shell 2 form an N-shaped structure from a side view angle;

it should be noted that the "N" shaped structure is in a "one" shaped arrangement with respect to the three pairs of gears described in the CN202812153U patent and in a "V" shaped arrangement with respect to the two pairs of gears described in the CN208221550U patent; compared with the straight-line structure and the V-shaped structure, the N-shaped structure is more compact in arrangement and worse in lubricating condition of the bearing, and especially the lubricating path design when the whole vehicle moves forwards or backwards at low speed is considered.

Further, a first shaft bearing 4 is installed in the first shaft bearing hole, a second shaft bearing 6 is installed in the second shaft bearing hole, a third shaft bearing 7 is installed in the third shaft bearing hole, a differential bearing 9 is installed in the differential bearing hole, a first driving gear 01 is sleeved on the first shaft bearing 4, a first driven gear 02 is sleeved on the second shaft bearing 6, the first driven gear 02 is connected with a second driving gear 03, the first driven gear 02 is meshed with the first driving gear 01, a third driving gear 05 is sleeved on the third shaft bearing 7, the third driving gear 05 is connected with a second driven gear 04, the second driven gear 04 is meshed with the second driving gear 03, the third driving gear 05 is meshed with a third driven gear 06, and the power output end of the third driven gear.

Further, the housing cover 1 and the housing 2 are designed separately and connected by a hexagon head bolt 3.

When the speed reducer shell is assembled, the method comprises the following steps:

1. pressing outer rings of a first shaft bearing 4, a second shaft bearing 6 and a third shaft bearing 7 into corresponding bearing holes of the shell cover 1;

2. further sequentially pressing and installing the outer rings of the oil seal 5, the first shaft bearing 4, the second shaft bearing 6, the third shaft bearing 7 and the differential bearing 9 into corresponding mounting holes of the shell 2;

3. further press-fitting the inner ring belt roller assemblies of the pair of one-shaft bearings 4 on the primary driving gear 01; assembling a primary driven gear 02 to a secondary driving gear 03, and press-fitting an inner ring belt roller assembly of a pair of two-shaft bearings 6 on the secondary driving gear 03; assembling a secondary driven gear 04 on a tertiary driving gear 05, and press-fitting an inner ring assembly with rollers of a pair of three-shaft bearings 7 on the tertiary driving gear 05;

4. further, the components of the pressed gear and the bearing are sequentially placed into a shell 2 of the pressed bearing outer ring;

5. further closing the shell cover 1 with the bearing outer ring pressed and mounted thereon with the shell 2, and connecting and fastening the shell cover and the shell cover through a plurality of hexagon bolts 3;

6. further connecting the third-stage driven gear 06 with a differential assembly 8 through a hexagon head bolt 3, and then pressing the third-stage driven gear into an inner ring belt roller assembly of a differential bearing 9;

7. further putting the differential assembly 8 assembled with the gear and the bearing into the shell 2, covering the bearing cover 10 tightly and fastening by a bearing cover bolt 11; and assembling the reducer assembly.

Furthermore, a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole in the shell cover 1 are arranged in a triangular shape. The reinforcing ribs arranged at the bottoms of the first shaft bearing hole and the third shaft bearing hole provide an oil storage cavity for the bearing, and the oil storage cavity or other oil grooves are not needed to be arranged because the second shaft bearing hole is positioned at the lowest end and part of the area is covered by gear oil;

a V-shaped oil baffle plate 001 with an inclined angle is arranged right above a first shaft bearing hole (the distance between the V-shaped oil baffle plate 001 and a gear is about 5mm in a gear assembling state), a hidden oil groove 002 is arranged at the bottom of the V-shaped oil baffle plate 001, gear oil splashed at a high speed by the gear can be collected by the V-shaped oil baffle plate 001 and is guided into a first shaft bearing 4 through the hidden oil groove 002, and effective lubrication of the first shaft bearing 4 on the side of the shell cover 1 at a high speed is guaranteed;

an inclined oil groove 003 is arranged above the side of the triaxial bearing hole, and the other end of the oil groove 003 is positioned at the mounting surface of the shell cover 1 and the shell 2 (the oil groove at the corresponding position on the shell can be communicated when the shell is closed) so as to guide the gear oil collected by the low-high speed lower shell into the triaxial bearing hole; an open oil groove 004 with a rhombic cross section is obliquely and downwards arranged between the three-shaft bearing hole and the first shaft bearing hole, the rhombic open oil groove 004 can naturally guide gear oil at the three-shaft bearing hole into the first shaft bearing hole and can also collect gear oil adhered above the open oil groove 004 and guide the gear oil into the first shaft bearing hole, and the hidden danger that the oil collecting effect of a V-shaped oil baffle above the lower shaft bearing hole at a low speed is weak or even invalid can be effectively supplemented.

In addition, a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are also formed in the shell 2, the three-shaft bearing hole, the two-shaft bearing hole and the one-shaft bearing hole are arranged in the shell 2 in a triangular mode, reinforcing ribs arranged at the bottom of the three-shaft bearing hole provide an oil storage cavity for the bearing, and the one-shaft bearing hole is an input shaft hole, the two-shaft bearing hole part can be covered by gear oil and is not provided with the oil storage cavity; an inclined V-shaped oil baffle plate 101 is arranged right above a bearing hole of the first shaft, a hidden oil groove 102 is arranged at the bottom of the V-shaped oil baffle plate 101, gear oil splashed at a high speed by the gear can be collected by the V-shaped oil baffle plate 101 and guided into the first shaft bearing 4 through the hidden oil groove 102, and effective lubrication of the first shaft bearing 4 on the side of the shell 2 at a high speed is ensured; a step-shaped L-shaped oil baffle plate 103 with an inclined angle is arranged above the side of the triaxial bearing hole, and an inclined oil sump 104 is arranged at the bottom of the L-shaped oil baffle plate 103 so as to collect and guide gear oil adhered or splashed by the low-high speed lower three-stage driven gear 06 into the triaxial bearing hole; a hidden oil groove 105 is obliquely and downwards arranged between the three-shaft bearing hole and the one-shaft bearing hole, gear oil at the three-shaft bearing hole can be naturally guided into the one-shaft bearing hole by the hidden oil groove 105, and the hidden danger that the oil collecting effect of the V-shaped oil baffle plate above the lower-speed one-shaft bearing hole is weak or even invalid can be effectively supplemented. The other side of the shell 2 needs to be covered with the shell cover 1 through the hexagon head bolts 3, and the region of the side close to the upper part of the differential assembly 8 is provided with a double V-shaped oil baffle plate 106 which has an inclined angle and is distributed up and down. The upper bottom of the double-V-shaped oil baffle 106 is provided with a through hole, so that oil collected by the upper oil baffle can be guided into the lower oil baffle, the lower bottom of the double-V-shaped oil baffle is laterally provided with a downward inclined oil groove 107, and the other end of the oil groove 107 is positioned at the mounting surface of the shell 2 and the shell cover 1 (the oil groove can be communicated with the corresponding position on the shell cover when the shell cover is closed), so that gear oil collected by the double-V-shaped oil baffle at low-high speed is guided into the triaxial bearing hole of the shell cover through the shell cover oil groove. The space between the stepped L-shaped oil baffle plate 103 and the adjacent gear is set to be about 5mm in the state that the gears are assembled by the double-V-shaped oil baffle plate 106, so that when all stages of gears are reversely rotated at low speed, gear oil can be extruded into the oil baffle plates by virtue of the oil pumping action of the gears, and the reliable lubrication of the gear and the bearing in the reduction gearbox when the whole vehicle retreats is ensured.

As shown in fig. 3, 4 and 5, the gear oil level is positioned at the two-shaft bearing hole 1/3 at the lowest end when the two-shaft bearing 6 is in a standing state, and can be normally lubricated; when the whole vehicle runs at a high speed in a middle-high speed, effective lubrication of each gear and a bearing can be ensured by virtue of the splashing effect of the gear and the oil guide function of each oil baffle plate and each oil groove;

when the whole vehicle advances at a low speed, the gear oil collected by the oil baffle plate 106 and the dark oil groove 107 of the shell 2 at a low speed can be guided into and lubricate the triaxial bearing 7 by the dark oil groove 003 arranged above the hole side of the triaxial bearing, and then the gear oil at the hole of the triaxial bearing is guided into and lubricate the first shaft bearing 4 by the rhombic bright oil groove 004; meanwhile, gear oil adhered to the upper side of the open oil groove can naturally flow into a shaft bearing hole, and the hidden danger that the oil baffle 001 and the dark oil groove 002 above the lower shaft bearing 4 at a low speed are weak in oil collecting effect or even ineffective can be effectively supplemented.

When the whole vehicle moves backwards at a low speed, the oil baffle 106 and the dark oil groove 107 of the shell 2 can still collect gear oil adhered to the three-stage driven gear 06 to guide in and lubricate the three-shaft bearing 7, and then guide in and lubricate the one-shaft bearing 4 through the diamond-shaped bright oil groove 004; meanwhile, an oil baffle 001 and a dark oil groove 002 which are arranged right above the first shaft bearing 4 can collect gear oil splashed by the reverse rotation of the second-stage driven gear 04 and guide the gear oil into the first shaft bearing 4 for lubrication; the effective lubrication of each bearing during low-speed backing is ensured;

as shown in fig. 1, 6 to 9, which are a side view of the housing and a schematic flow diagram of the gear oil under forward and backward working conditions of the present invention; FIG. 4 is a schematic view of the direction of oil flow of the gear at the end of the housing to which the cover is attached according to the present invention; this example is further illustrated:

when the gear oil is placed still, the liquid level of the gear oil is positioned at the position of the two-shaft bearing hole 1/3 at the lowest end, and the two-shaft bearing 6 can be normally lubricated; when the whole vehicle runs at a high speed in a middle-high speed, effective lubrication of each gear and a bearing can be ensured by virtue of the splashing effect of the gear and the oil guide function of each oil baffle plate and each oil groove;

when the whole vehicle advances at a low speed, gear oil adhered to the third-stage driven gear 06 is squeezed into the oil baffle plate 103 and the oil groove 104 above the side of the three-shaft bearing hole to lubricate the three-shaft bearing 7, and then the gear oil at the three-shaft bearing hole is led into the lubricating one-shaft bearing 4 through the oil groove 105 arranged between the three-shaft bearing hole and the two-shaft bearing hole;

when the whole vehicle moves backwards at a low speed, gear oil adhered to the third-stage driven gear 06 can still be reversely pumped into the oil baffle plate 103 above the side of the triaxial bearing hole and is guided into and lubricates the triaxial bearing 7 through the dark oil groove 104, and then lubricates the first shaft bearing 4 through the dark oil groove 105; meanwhile, an oil baffle plate 101 and a dark oil groove 102 which are arranged right above the first shaft bearing 4 can collect gear oil splashed by the reverse rotation of the third-stage driving gear 05 and guide the gear oil into the first shaft bearing 4 for lubrication; the effective lubrication of each bearing during low-speed backing is ensured;

no matter the whole vehicle moves forward at low speed or high speed or moves backward at low speed, because the distance between the oil baffle plate 106 of the shell 2 and the third-stage driven gear 06, the second-stage driven gear 04 and the differential assembly 8 is very close, gear oil adhered on the third-stage driven gear 06, the second-stage driven gear 04 and the differential assembly 8 can be pumped into the oil baffle plate 106 under the action of the self rotating force, continuous gear oil flows into the shell cover 1 through the dark oil groove 107 and the dark oil groove 003 on the shell cover 1, and each bearing and gear assembled at the shell cover 1 are lubricated efficiently.

The speed reducer shell adopts a split design, so that casting, production and processing of the shell and the shell cover are facilitated, and the assembly of a subsequent gear and a bearing group is facilitated; various oil baffle plates and oil grooves ingeniously designed on the shell and the shell cover ensure the efficient lubrication of the speed reducer when the whole vehicle moves forwards at low-high speed or moves backwards at low speed; the reliable operation of new forms of energy car and the user demand of travelling comfort are guaranteed.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes in shape and structure made by using the contents of the present specification and drawings, or applied directly or indirectly to other related technical fields are included in the scope of the present invention.

Claims

1. A speed reducer shell for a new energy vehicle in an N-shaped arrangement comprises a shell cover and a shell body which are connected with each other, wherein a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are formed in the shell cover and the shell body respectively;

2. The reducer casing for the new energy vehicle in the N-shaped arrangement according to claim 1, wherein the casing cover and the casing body are separately designed and are connected through a hexagon bolt.

3. The reducer casing for the new energy vehicle in the N-shaped arrangement according to claim 2, wherein the three-shaft bearing hole, the two-shaft bearing hole and the one-shaft bearing hole in the casing cover are arranged in a triangular shape, the reinforcing ribs arranged at the bottoms of the one-shaft bearing hole and the three-shaft bearing hole provide an oil storage chamber for the bearing, a V-shaped oil baffle plate with an inclined angle is arranged right above the one-shaft bearing hole, a dark oil groove is arranged at the bottom of the V-shaped oil baffle plate, and gear oil splashed at a high speed by the gear is collected and guided into and lubricates the one-shaft bearing through the dark oil groove.

4. The reducer casing for a new energy vehicle in an N-shaped arrangement according to claim 3, wherein an inclined oil sump is provided above the side of the triaxial bearing hole, and the other end of the oil sump is located at a mounting surface of the casing cover and the casing body, so that gear oil collected by the casing body in a low-high speed condition is guided into the triaxial bearing hole to lubricate the triaxial bearing.

5. The reducer casing for the new energy vehicle arranged in the N-shape according to claim 4, wherein a diamond-shaped open oil groove with a cross section is obliquely and downwards arranged between the three-shaft bearing hole and the one-shaft bearing hole, and the diamond-shaped open oil groove naturally guides gear oil at the three-shaft bearing hole into the one-shaft bearing hole, collects gear oil adhered above the open oil groove and guides the gear oil into the one-shaft bearing hole, so that the hidden danger that the oil collecting effect of the V-shaped oil baffle plate above the one-shaft bearing hole at a low speed is weak or even ineffective is supplemented.

6. The speed reducer shell for the new energy vehicle in the N-shaped arrangement according to claim 2, wherein a three-shaft bearing hole, a two-shaft bearing hole and a one-shaft bearing hole are also formed in the shell, the three-shaft bearing hole, the two-shaft bearing hole and the one-shaft bearing hole are arranged in the shell in a triangular manner, and a reinforcing rib arranged at the bottom of the three-shaft bearing hole provides an oil storage cavity for the bearing.

7. The reducer casing for the new energy vehicle in the N-shaped arrangement according to claim 6, wherein an inclined V-shaped oil baffle is arranged right above a bearing hole of a shaft in the casing, and a sump is arranged at the bottom of the V-shaped oil baffle; a step-shaped L-shaped oil baffle plate with an inclined angle is arranged above the side of the triaxial bearing hole, and an inclined oil groove is arranged at the bottom of the L-shaped oil baffle plate so as to collect and guide gear oil adhered or splashed by the three-stage driven gear under low-high speed into the triaxial bearing hole;

8. The reducer casing for a new energy vehicle in an N-shaped arrangement according to claim 7, wherein the casing is provided with a double-V-shaped oil baffle which is arranged in an up-down direction and has an inclined angle near an upper region of the differential assembly, the double-V-shaped oil baffle comprises an upper oil baffle and a lower oil baffle, a through hole is formed in the bottom of the upper oil baffle so that oil collected by the upper oil baffle can be guided into the lower oil baffle, a dark oil groove which is inclined downwards is laterally formed in the lower bottom of the double-V-shaped oil baffle, the other end of the dark oil groove is located on a mounting surface of the casing and the casing cover, and gear oil collected by the double-V-shaped oil baffle in a low-high speed state is guided into the triaxial bearing hole of the casing cover through the dark oil groove of the casing cover.

9. The reducer casing for the new energy vehicle in the N-shaped arrangement according to claim 8, wherein the distance between the stepped L-shaped oil baffle and the adjacent gear is set to be 5mm in a state that the gears are assembled on the double V-shaped oil baffle, and when each stage of gear rotates reversely at a low speed, gear oil is extruded into each oil baffle by virtue of the oil pumping action of the gears, so that the reliable lubrication of bearings in the reduction gearbox is ensured when the whole vehicle retreats.

10. The speed reducer shell for the new energy vehicle in the N-shaped arrangement according to claim 9, wherein the speed reducer shell is characterized in that

In assembling the speed reducer case: