Bevel gear pure electric four-gear gearbox

Abstract

The utility model discloses a helical gear pure electric four-gear gearbox, which is characterized in that during operation, lubricating oil in the gearbox can be actively pumped to a set position to lubricate and circularly radiate heat, so that the loss is reduced. The transmission includes: an input shaft; an output shaft; a short intermediate shaft; a long intermediate shaft; and an oil pump; an input shaft and an output shaft which are coaxially arranged are arranged in the middle of the gearbox shell in the width direction, the short intermediate shaft and the long intermediate shaft which are arranged in parallel are arranged on the two sides of the input shaft and the two sides of the output shaft respectively, the end, facing the output shaft, of the input shaft is assembled in a paired mode through an input shaft head bearing, and the input shaft is fixedly sleeved with an input shaft gear. The axial positions, corresponding to the input shaft gears, of the short intermediate shaft and the long intermediate shaft are each provided with an intermediate shaft normally-meshed gear, and the two sets of intermediate shaft normally-meshed gears are connected with the input shaft gears in a meshed mode. The gears sleeved on the input shaft, the output shaft, the short intermediate shaft and the long intermediate shaft are helical gears.

Description

Technical Field

[0001] This utility model relates to the technical field of gearbox structure, specifically a helical gear pure electric four-speed gearbox. Background Technology

[0002] Heavy-duty trucks consume vast amounts of petroleum and are among the largest sources of CO2 emissions in the transportation sectors of major global economies. Diesel vehicles are also a major source of air pollution, accounting for over 90% of particulate emissions and over 70% of NOx emissions from automobiles. Therefore, research into energy-saving and emission-reduction technologies for heavy-duty trucks is of great significance for reducing my country's petroleum consumption and greenhouse gas emissions, decreasing dependence on imported oil, and protecting the environment. Adopting multi-speed AMT (Automated Manual Transmission) pure electric transmissions is an important technological approach to addressing fuel consumption and avoiding harmful emissions in heavy-duty trucks, and has received considerable attention both domestically and internationally in recent years, representing one of the best future development directions for heavy-duty trucks. However, existing pure electric transmissions experience excessive axial force during power transmission, leading to unstable operation and relatively high energy consumption. Furthermore, existing pure electric transmissions require an independent shaft to drive the oil pump, further increasing wear and tear. Therefore, there is an urgent need to develop a transmission that operates smoothly and with low wear and tear. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a helical gear pure electric four-speed transmission. During operation, the internal lubricating oil of the transmission can be actively pumped to a set position for lubrication and circulated for heat dissipation, thereby reducing losses.

[0004] A helical gear pure electric four-speed transmission, characterized in that it comprises:

[0005] Input axis;

[0006] Output shaft;

[0007] Short intermediate shaft;

[0008] Long intermediate shaft;

[0009] And the oil pump;

[0010] An input shaft and an output shaft are coaxially arranged in the middle of the width direction of the gearbox housing. A short intermediate shaft and a long intermediate shaft are arranged in parallel on both sides of the input shaft and output shaft, respectively. The end of the input shaft facing the output shaft is assembled by an input shaft head bearing. An input shaft gear is fixedly fitted on the input shaft. Intermediate shaft constant mesh gears are respectively provided on the short and long intermediate shafts at axial positions corresponding to the input shaft gear. Two sets of intermediate shaft constant mesh gears mesh with the input shaft gear. Intermediate shaft third gear, intermediate shaft second gear, and intermediate shaft first gear are respectively fixed on the short and long intermediate shafts at axial positions corresponding to the output shaft. A freely rotatable output shaft third gear, output shaft second gear, and output shaft first gear are respectively fitted on the output shaft. The output shaft third gear meshes with the intermediate shaft third gears on both sides, the output shaft second gear meshes with the intermediate shaft second gears on both sides, and the output shaft first gear meshes with the intermediate shaft first gears on both sides.

[0011] The gears mounted on the input shaft, output shaft, short intermediate shaft, and long intermediate shaft are all helical gears;

[0012] The factors affecting the axial force of the helical gears are as follows: the input shaft gear and the gears on the output shaft are both left-hand helical gears, while the gears on the short intermediate shaft and the long intermediate shaft are right-hand helical gears.

[0013] The short intermediate shaft protrudes outward from the position of the corresponding end cover and is fixed to the drive shaft of the oil pump. The pump body of the oil pump is fixed to the corresponding position of the end cover of the gearbox housing. The input end of the oil pump is connected to the bottom inner cavity of the gearbox housing through an internal oil pipe. The output port of the oil pump is connected to the oil circuit system inlet of the gearbox housing.

[0014] Its further features are:

[0015] The long intermediate shaft protrudes outward from one end of the corresponding end cover and is exposed. The exposed end of the long intermediate shaft is provided with a spline for connecting the power take-off unit.

[0016] A third and fourth gear hub sleeve is fitted on the output shaft near the input shaft. A spline structure is provided on the axial moving end of the output shaft corresponding to the third and fourth gear hub sleeve. A first and second gear hub sleeve is fitted between the second gear and the first gear of the output shaft. A spline structure is provided on the axial moving end of the output shaft corresponding to the first and second gear hub sleeve. The third gear, second gear, and first gear of the output shaft are loosely fitted on the output shaft and positioned by gear spacers. A long key is inserted between the output shaft and the spacers to prevent the spacers from rotating.

[0017] When shifting to the correct gear, both the left and right sides of the first and second gear hub sleeves are limited by spacers; when shifting to the third or fourth gear, the left side of the third and fourth gear hub sleeves is the fourth gear, limited by the end face of the input shaft gear, and the right side of the third and fourth gear hub sleeves is the third gear, limited by the corresponding spacers.

[0018] The input shaft is positioned by an input shaft ball bearing on the end cap side near the input shaft, and the output shaft is positioned by an output shaft bearing on the end cap side near the output shaft. The front end of the input shaft is inserted into the central concave cavity of the output shaft and is connected and supported to the output shaft by an input shaft head bearing to ensure coaxiality.

[0019] The short intermediate shaft and the long intermediate shaft are each provided with a front bearing and a rear bearing at the two end caps of the gearbox housing, so that the short intermediate shaft, the long intermediate shaft and the gearbox housing are reliably and securely connected.

[0020] The short intermediate shaft and the long intermediate shaft are symmetrically arranged relative to the combined shaft of the input shaft and the output shaft, thereby canceling out the axial forces on the input shaft and the output shaft, and making the axial forces of the short intermediate shaft and the long intermediate shaft as much as possible canceled out.

[0021] With the structure of this utility model, the short intermediate shaft is connected to the drive shaft of the oil pump. During the rotation of the gearbox, the oil pump continuously pumps lubricating oil into the gearbox, thereby enabling the gearbox to have an active lubrication function. In addition, the gears mounted on the input shaft, output shaft, short intermediate shaft, and long intermediate shaft are all helical gears. The gears on the input shaft and output shaft are all left-hand helical gears, while the gears on the short intermediate shaft and long intermediate shaft are right-hand helical gears, which makes the operation smoother and the noise lower. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 A schematic diagram of the short intermediate shaft structure applicable to this utility model;

[0024] Figure 3 A schematic diagram of the long intermediate shaft structure applicable to this utility model;

[0025] The names corresponding to the serial numbers in the diagram are as follows:

[0026] Input shaft 1, Input shaft ball bearing 2, Intermediate shaft front bearing 3, Intermediate shaft constant mesh gear 4, Intermediate shaft third gear 5, Intermediate shaft second gear 6, Short intermediate shaft 7, Intermediate shaft first gear 8, Intermediate shaft rear bearing 9, Oil pump 10, Output shaft 11, Output shaft bearing 12, Output shaft first gear 13, First and second gear hub sleeves 14, Output shaft second gear 15, Long intermediate shaft 16, Output shaft third gear 17, Third and fourth gear hub sleeves 18, Input shaft head bearing 19, Input shaft gear 20;

[0027] Gearbox housing 100. Detailed Implementation

[0028] A helical gear pure electric four-speed transmission, see Figures 1-3 It includes an input shaft 1, an output shaft 11, a short intermediate shaft 7, a long intermediate shaft 16, an oil pump 10, and a gearbox housing 100;

[0029] An input shaft 1 and an output shaft 11 are coaxially arranged in the middle of the width direction of the gearbox housing 100. Short intermediate shafts 7 and long intermediate shafts 16 are arranged in parallel on both sides of the input shaft 1 and output shaft 11, respectively. The end of the input shaft 1 facing the output shaft 11 is paired and assembled via an input shaft head bearing 19. An input shaft gear 20 is fixedly sleeved on the input shaft 1. Intermediate shaft constant mesh gears 4 are respectively arranged on the short intermediate shafts 7 and long intermediate shafts 16 at axial positions corresponding to the input shaft gear 20. The two sets of intermediate shaft constant mesh gears 4 mesh with and connect to the input shaft gear 20. Intermediate shaft 7 and long intermediate shaft 16 are respectively fixed with intermediate shaft third gear 5, intermediate shaft second gear 6 and intermediate shaft first gear 8 at the axial corresponding positions of output shaft 11. Output shaft 11 is respectively fitted with freely rotatable output shaft third gear 17, output shaft second gear 15 and output shaft first gear 13. Output shaft third gear 17 meshes with intermediate shaft third gear 5 on both sides, output shaft second gear 15 meshes with intermediate shaft second gear 6 on both sides, and output shaft first gear 13 meshes with intermediate shaft first gear 8 on both sides.

[0030] The gears mounted on the input shaft 1, output shaft 11, short intermediate shaft 7, and long intermediate shaft 16 are all helical gears;

[0031] Due to the axial force of the helical gears, the gears on the input shaft gear 20 and the output shaft 11 are all left-hand helical gears, while the gears on the short intermediate shaft 7 and the long intermediate shaft 16 are right-hand helical gears.

[0032] The short intermediate shaft 7 protrudes outward from the corresponding end cover and is fixedly connected to the drive shaft of the oil pump 10. The pump body of the oil pump 10 is fixedly connected to the corresponding end cover of the gearbox housing 100. The input end of the oil pump 10 is connected to the bottom cavity of the gearbox housing through an internal oil pipe. The output port of the oil pump 10 is connected to the oil circuit system inlet of the gearbox housing. The oil circuit system can be built into the gearbox housing 100, externally mounted with oil pipes, or oil grooves or oil passages can be opened on the input shaft 1, output shaft 11, short intermediate shaft 7, and long intermediate shaft 16, depending on the actual situation. It can be installed into the oil circuit system inlet through matching oil pipes.

[0033] In a specific embodiment, the long intermediate shaft 16 protrudes outward from one end of the corresponding end cover and is exposed. The exposed end of the long intermediate shaft 16 is provided with a spline for connecting the power take-off.

[0034] A third- or fourth-gear hub sleeve 18 is fitted on the output shaft 11 near the input shaft 1. A spline structure is provided on the axial moving end of the output shaft 11 corresponding to the third- or fourth-gear hub sleeve 18. A first- or second-gear hub sleeve 14 is fitted between the output shaft second-gear 15 and the output shaft first-gear 13 of the output shaft 11. A spline structure is provided on the axial moving end of the output shaft 11 corresponding to the first- or second-gear hub sleeve 14. The output shaft third-gear 17, the output shaft second-gear 15, and the output shaft first-gear 13 are respectively loosely fitted on the output shaft 11 and positioned by gear spacers. A long key is inserted between the output shaft 11 and the spacers to prevent the spacers from rotating.

[0035] When shifting to the correct gear, the left and right sides of the first and second gear hub sleeve 14 are both limited by spacers; when shifting to the third and fourth gear, the left side of the third and fourth gear hub sleeve 18 is the fourth gear, limited by the end face of the input shaft gear 20, and the right side of the third and fourth gear hub sleeve 18 is the third gear, limited by the corresponding spacers.

[0036] The input shaft 1 is positioned by the input shaft ball bearing 2 on the end cover side near the input shaft 1, and the output shaft 11 is positioned by the output shaft bearing 12 on the end cover side near the output shaft 1. The front end of the input shaft 1 is inserted into the central concave cavity of the output shaft 11 and is connected and supported to the output shaft 11 by the input shaft head bearing 19 to ensure coaxiality.

[0037] The short intermediate shaft 7 and the long intermediate shaft 16 are provided with a front intermediate shaft bearing 3 and a rear intermediate shaft bearing 9 at the two end cap positions of the gearbox housing 100, so that the short intermediate shaft 7, the long intermediate shaft 16 and the gearbox housing 100 are reliably limited and connected.

[0038] The short intermediate shaft 7 and the long intermediate shaft 16 are symmetrically arranged relative to the combined shaft of the input shaft 1 and the output shaft 11, thereby canceling out the axial forces on the input shaft 1 and the output shaft 11, and making the axial forces of the short intermediate shaft 7 and the long intermediate shaft 16 as canceled out as much as possible.

[0039] In a specific embodiment, the gearbox has a dual intermediate shaft structure;

[0040] In first gear: First and second gear hub sleeve 14 moves to the right and engages with first gear 13 on the output shaft. Power input - input shaft 1 - input shaft gear 20 - intermediate shaft constant mesh gear 4 - intermediate shaft - intermediate shaft first gear 8 - output shaft first gear 13 - first and second gear hub sleeve 14 - output shaft 11;

[0041] In second gear: the first and second gear hub sleeve 14 moves to the left and engages with the second gear 15 on the output shaft. Power input - input shaft 1 - input shaft gear 20 - intermediate shaft constant mesh gear 4 - intermediate shaft - intermediate shaft second gear 6 - output shaft second gear 15 - first and second gear hub sleeve 14 - output shaft 11;

[0042] In the third gear state: the third and fourth gear hub sleeve 18 moves to the right and engages with the third gear 17 on the output shaft. Power input - input shaft 1 - input shaft gear 20 - intermediate shaft constant mesh gear 4 - intermediate shaft - intermediate shaft third gear 5 - output shaft third gear 17 - third and fourth gear hub sleeve 14 - output shaft 11;

[0043] In fourth gear: the third and fourth gear hub sleeve 18 moves to the left and engages with the input shaft 1. Fourth gear is a direct drive, and the power input is directly transmitted through the input shaft 1 - the third and fourth gear hub sleeve 14 - the transmission output shaft 11.

[0044] Its beneficial effects are as follows: The short intermediate shaft connects to the drive shaft of the oil pump. During the rotation of the gearbox, the oil pump always pumps lubricating oil into the gearbox, thus enabling the gearbox to have an active lubrication function. In addition, the gears mounted on the input shaft, output shaft, short intermediate shaft, and long intermediate shaft are all helical gears. The gears on the input shaft and output shaft are all left-hand helical gears, while the gears on the short intermediate shaft and long intermediate shaft are right-hand helical gears, which makes the operation smoother and the noise lower.

[0045] The gear hub sleeve integrates the shift gear hub and shift gear sleeve into one unit, taking into account the functions of both. It eliminates the engagement teeth, adopts an exposed sleeve spline and an inwardly recessed gear engagement spline, which simplifies the structure and improves reliability.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A helical gear pure electric four-speed transmission, characterized in that, It includes: Input axis; Output shaft; Short intermediate shaft; Long intermediate shaft; And oil pump; An input shaft and an output shaft are coaxially arranged in the middle of the width direction of the gearbox housing. A short intermediate shaft and a long intermediate shaft are arranged in parallel on both sides of the input shaft and output shaft, respectively. The end of the input shaft facing the output shaft is assembled by an input shaft head bearing. An input shaft gear is fixedly fitted on the input shaft. Intermediate shaft constant mesh gears are respectively provided on the short and long intermediate shafts at axial positions corresponding to the input shaft gear. Two sets of intermediate shaft constant mesh gears mesh with the input shaft gear. Intermediate shaft third gear, intermediate shaft second gear, and intermediate shaft first gear are respectively fixed on the short and long intermediate shafts at axial positions corresponding to the output shaft. A freely rotatable output shaft third gear, output shaft second gear, and output shaft first gear are respectively fitted on the output shaft. The output shaft third gear meshes with the intermediate shaft third gears on both sides, the output shaft second gear meshes with the intermediate shaft second gears on both sides, and the output shaft first gear meshes with the intermediate shaft first gears on both sides. The gears mounted on the input shaft, output shaft, short intermediate shaft, and long intermediate shaft are all helical gears; The factors affecting the axial force of the helical gears are as follows: the input shaft gear and the gears on the output shaft are both left-hand helical gears, while the gears on the short intermediate shaft and the long intermediate shaft are right-hand helical gears. The short intermediate shaft protrudes outward from the position of the corresponding end cover and is fixed to the drive shaft of the oil pump. The pump body of the oil pump is fixed to the corresponding position of the end cover of the gearbox housing. The input end of the oil pump is connected to the bottom inner cavity of the gearbox housing through an internal oil pipe. The output port of the oil pump is connected to the oil circuit system inlet of the gearbox housing.

2. The helical gear pure electric four-speed transmission according to claim 1, characterized in that: The long intermediate shaft protrudes outward from one end of the corresponding end cap and is exposed. The exposed end of the long intermediate shaft is provided with a spline for connecting the power take-off unit.

3. The helical gear pure electric four-speed transmission according to claim 1, characterized in that: A third and fourth gear hub sleeve is fitted on the output shaft near the input shaft. A spline structure is provided on the axial moving end of the output shaft corresponding to the third and fourth gear hub sleeve. A first and second gear hub sleeve is fitted between the second gear and the first gear of the output shaft. A spline structure is provided on the axial moving end of the output shaft corresponding to the first and second gear hub sleeve. The third gear, second gear, and first gear of the output shaft are loosely fitted on the output shaft and positioned by gear spacers. A long key is inserted between the output shaft and the spacers.

4. A helical gear pure electric four-speed transmission according to claim 3, characterized in that: When shifting to the correct gear, both the left and right sides of the first and second gear hub sleeves are limited by spacers; when shifting to the third or fourth gear, the left side of the third and fourth gear hub sleeves is the fourth gear, limited by the end face of the input shaft gear, and the right side of the third and fourth gear hub sleeves is the third gear, limited by the corresponding spacers.

5. A helical gear pure electric four-speed transmission according to claim 1, characterized in that: The input shaft is positioned near the end cap of the input shaft by an input shaft ball bearing, and the output shaft is positioned near the end cap of the output shaft by an output shaft bearing. The front end of the input shaft is inserted into the central concave cavity of the output shaft and is connected and supported to the output shaft by an input shaft head bearing.

6. A helical gear pure electric four-speed transmission according to claim 1, characterized in that: The short intermediate shaft and the long intermediate shaft are each equipped with a front intermediate shaft bearing and a rear intermediate shaft bearing at the positions of the two end caps corresponding to the gearbox housing.

7. A helical gear pure electric four-speed transmission according to claim 1, characterized in that: The short intermediate shaft and the long intermediate shaft are symmetrically arranged relative to the combined shaft of the input shaft and the output shaft.

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