阅读说明：本技术 汽车及其倒置式多档变速器 (Automobile and inverted multi-gear transmission thereof ) 是由 关建成 罗冰华 于 2019-11-21 设计创作，主要内容包括：本发明涉及一种汽车及其倒置式多档变速器。倒置式多档变速器包括壳体、输入轴、输出轴、中间轴、换挡齿轮副总成及常啮合齿轮副总成。输入轴及输出轴同轴设置且可转动地连接。输入轴的一端可转动地穿设于隔板,另一端穿过第一腔与壳体的侧壁可转动地连接。输出轴远离输入轴的一端穿过第二腔与壳体的侧壁可转动地连接。中间轴可转动地安装于壳体的侧壁。换挡齿轮副总成包括换挡主动齿轮组件、换挡从动齿轮组件及换挡同步器组件。常啮合齿轮副总成包括常啮合主动齿轮组件、常啮合从动齿轮组件及常啮合同步器组件。因此,上述汽车及其倒置式多档变速器在保证较高的传动效率的同时,减小了体积。(The invention relates to an automobile and an inverted multi-gear transmission thereof. The inverted multi-gear transmission comprises a shell, an input shaft, an output shaft, a middle shaft, a gear shifting gear pair assembly and a normally meshed gear pair assembly. The input shaft and the output shaft are coaxially arranged and rotatably connected. One end of the input shaft is rotatably arranged on the partition plate in a penetrating mode, and the other end of the input shaft penetrates through the first cavity and is rotatably connected with the side wall of the shell. One end of the output shaft, which is far away from the input shaft, penetrates through the second cavity and is rotatably connected with the side wall of the shell. The intermediate shaft is rotatably mounted to the side wall of the housing. The gear pair assembly comprises a gear shifting driving gear assembly, a gear shifting driven gear assembly and a gear shifting synchronizer assembly. The constant mesh gear pair assembly comprises a constant mesh driving gear assembly, a constant mesh driven gear assembly and a constant mesh synchronizer assembly. Therefore, the automobile and the inverted multi-gear transmission thereof have the advantages that the size is reduced while the high transmission efficiency is ensured.)

1. An inverted multispeed transmission, comprising:

the shell is provided with an accommodating cavity, and a partition plate is arranged in the accommodating cavity to divide the accommodating cavity into a first cavity and a second cavity;

the input shaft and the output shaft are coaxially arranged and rotatably connected, one end of the input shaft rotatably penetrates through the partition plate, the other end of the input shaft penetrates through the first cavity and is rotatably connected with the side wall of the shell, and one end, far away from the input shaft, of the output shaft penetrates through the second cavity and is rotatably connected with the side wall of the shell;

the middle shaft is rotatably arranged on the side wall of the shell, and the middle shaft is parallel to the input shaft and the output shaft and is arranged at an interval;

the shifting gear pair assembly is positioned in the first cavity and comprises a shifting driving gear assembly fixedly arranged on the input shaft, a shifting driven gear assembly rotatably sleeved on the intermediate shaft and a shifting synchronizer assembly arranged on the intermediate shaft, and the shifting driving gear is in transmission connection with the shifting driven gear assembly; and

and the normally meshed gear pair assembly positioned in the second cavity comprises a normally meshed driving gear assembly fixedly arranged on the intermediate shaft, a normally meshed driven gear assembly rotatably sleeved on the output shaft and a normally meshed synchronizer assembly arranged on the output shaft, and the normally meshed driving gear assembly is in transmission connection with the normally meshed driven gear assembly.

2. The inverted multispeed transmission of claim 1, wherein the countershaft is rotatably disposed through the bulkhead and has one end rotatably connected to the side wall of the housing through the first cavity and another end rotatably connected to the side wall of the housing through the second cavity.

3. The inverted multiple speed transmission according to claim 1, wherein a mounting hole is formed in an end surface of the output shaft adjacent to one end of the first cavity, and one end of the input shaft adjacent to the output shaft extends into the second cavity and is rotatably disposed in the mounting hole.

4. The inverted multispeed transmission of claim 3, further comprising a connecting bearing, wherein one end of the input shaft is rotatably disposed through the mounting hole by the connecting bearing.

5. The inverted multispeed transmission of claim 3, wherein the mounting hole is a through hole disposed in an axial direction of the output shaft.

6. The inverted multi-speed transmission of claim 1, wherein a connecting hole is formed in an end surface of the input shaft adjacent to one end of the second cavity, and one end of the output shaft is rotatably inserted into the connecting hole.

7. The inverted multiple speed transmission of claim 1, wherein the shift driving gear assembly comprises a first gear driving gear, a second gear driving gear, a third gear driving gear and a fourth gear driving gear disposed at intervals in sequence and fixedly disposed on the input shaft;

the gear shifting driven gear assembly comprises a first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear which are sequentially arranged at intervals and rotatably sleeved on the intermediate shaft, and the first-gear driving gear, the second-gear driving gear, the third-gear driving gear and the fourth-gear driving gear are respectively meshed with the first-gear driven gear, the second-gear driven gear, the third-gear driven gear and the fourth-gear driven gear;

the gear shifting synchronizer assembly comprises a second gear synchronizer and a third fourth gear synchronizer, the second gear synchronizer and the third fourth gear synchronizer are both arranged on the intermediate shaft, the second gear synchronizer is located between the first gear driven gear and the second gear driven gear, and the third fourth gear synchronizer is located between the third gear driven gear and the fourth gear driven gear.

8. The inverted multiple speed transmission of claim 7, wherein the constant mesh drive gear assembly includes a high speed drive gear and a low speed drive gear spaced apart and secured to the intermediate shaft;

the normally meshed driven gear assembly comprises a high-speed driven gear and a low-speed driven gear which are sequentially arranged at intervals, and the high-speed driving gear and the low-speed driving gear are respectively meshed with the high-speed driven gear and the low-speed driven gear;

the constant mesh synchronizer assembly comprises a high-low gear synchronizer arranged on the output shaft, and the high-low gear synchronizer is positioned between the high-speed gear driven gear and the low-speed gear driven gear.

9. The inverted multiple speed transmission of claim 1, further comprising a reverse assembly including a reverse shaft received and fixed in the first cavity and parallel to and spaced apart from the input shaft and the countershaft, a reverse idler gear rotatably journalled in the reverse shaft and the countershaft, and a reverse driven gear engaged with the reverse driven gear and the shift drive gear assembly, respectively, and a reverse synchronizer mounted to the countershaft.

10. A motor vehicle comprising an inverted multispeed transmission as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of multi-gear transmission, in particular to an automobile and an inverted multi-gear transmission thereof.

Background

With the development of the automobile industry, especially with the rapid rise of new energy automobiles in recent years, higher requirements such as weight reduction and size reduction of the vehicle are made. In order to satisfy the requirements of vehicle dynamic performance and fuel economy well, a multi-speed transmission is generally used as an important part of an automobile. Whereas multi-speed transmissions having more than six gear positions typically use a plug-in or a stepped configuration.

However, the multi-speed transmission of either a plug-in or a stepped structure has problems of large size and low transmission efficiency.

Disclosure of Invention

Therefore, it is necessary to provide an automobile with high transmission efficiency and small volume and an inverted multi-speed transmission thereof, aiming at the problems of large volume and low transmission efficiency of the traditional multi-speed transmission.

An inverted multispeed transmission comprising:

the shell is provided with an accommodating cavity, and a partition plate is arranged in the accommodating cavity to divide the accommodating cavity into a first cavity and a second cavity;

the input shaft and the output shaft are coaxially arranged and rotatably connected, one end of the input shaft rotatably penetrates through the partition plate, the other end of the input shaft penetrates through the first cavity and is rotatably connected with the side wall of the shell, and one end, far away from the input shaft, of the output shaft penetrates through the second cavity and is rotatably connected with the side wall of the shell;

the middle shaft is rotatably arranged on the side wall of the shell, and the middle shaft is parallel to the input shaft and the output shaft and is arranged at an interval;

the shifting gear pair assembly is positioned in the first cavity and comprises a shifting driving gear assembly fixedly arranged on the input shaft, a shifting driven gear assembly rotatably sleeved on the intermediate shaft and a shifting synchronizer assembly arranged on the intermediate shaft, and the shifting driving gear is in transmission connection with the shifting driven gear assembly; and

and the normally meshed gear pair assembly positioned in the second cavity comprises a normally meshed driving gear assembly fixedly arranged on the intermediate shaft, a normally meshed driven gear assembly rotatably sleeved on the output shaft and a normally meshed synchronizer assembly arranged on the output shaft, and the normally meshed driving gear assembly is in transmission connection with the normally meshed driven gear assembly.

In one embodiment, the intermediate shaft is rotatably disposed through the partition plate, and one end of the intermediate shaft passes through the first cavity and is rotatably connected with the side wall of the housing, and the other end of the intermediate shaft passes through the second cavity and is rotatably connected with the side wall of the housing.

In one embodiment, a mounting hole is formed in an end surface of the output shaft, which is close to one end of the first cavity, and one end of the input shaft, which is close to the output shaft, extends into the second cavity and is rotatably arranged in the mounting hole in a penetrating manner.

In one embodiment, the device further comprises a connecting bearing, and one end of the input shaft is rotatably arranged in the mounting hole through the connecting bearing.

In one embodiment, the mounting hole is a through hole disposed in an axial direction of the output shaft.

In one embodiment, a connecting hole is formed in an end surface of the input shaft close to one end of the second cavity, and one end of the output shaft is rotatably arranged in the connecting hole in a penetrating mode.

In one embodiment, the gear shifting driving gear assembly comprises a first-gear driving gear, a second-gear driving gear, a third-gear driving gear and a fourth-gear driving gear which are sequentially arranged at intervals and fixedly arranged on the input shaft;

the gear shifting driven gear assembly comprises a first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear which are sequentially arranged at intervals and rotatably sleeved on the intermediate shaft, and the first-gear driving gear, the second-gear driving gear, the third-gear driving gear and the fourth-gear driving gear are respectively meshed with the first-gear driven gear, the second-gear driven gear, the third-gear driven gear and the fourth-gear driven gear;

the gear shifting synchronizer assembly comprises a second gear synchronizer and a third fourth gear synchronizer, the second gear synchronizer and the third fourth gear synchronizer are both arranged on the intermediate shaft, the second gear synchronizer is located between the first gear driven gear and the second gear driven gear, and the third fourth gear synchronizer is located between the third gear driven gear and the fourth gear driven gear.

In one embodiment, the constant mesh driving gear assembly comprises a high-speed driving gear and a low-speed driving gear which are sequentially arranged at intervals and fixedly arranged on the intermediate shaft;

the normally meshed driven gear assembly comprises a high-speed driven gear and a low-speed driven gear which are sequentially arranged at intervals, and the high-speed driving gear and the low-speed driving gear are respectively meshed with the high-speed driven gear and the low-speed driven gear;

the constant mesh synchronizer assembly comprises a high-low gear synchronizer arranged on the output shaft, and the high-low gear synchronizer is positioned between the high-speed gear driven gear and the low-speed gear driven gear.

In one embodiment, the reverse gear assembly further comprises a reverse gear assembly, the reverse gear assembly comprises a reverse gear shaft, a reverse gear idle gear, a reverse gear driven gear and a reverse gear synchronizer, the reverse gear shaft is accommodated and fixed in the first cavity and is parallel to and spaced from the input shaft and the intermediate shaft respectively, the reverse gear idle gear and the reverse gear driven gear are rotatably sleeved on the reverse gear shaft and the intermediate shaft respectively, the reverse gear idle gear is meshed with the reverse gear driven gear and the gear shifting driving gear assembly respectively, and the reverse gear synchronizer is mounted on the intermediate shaft.

An automobile includes an inverted multiple speed transmission.

In the automobile and the inverted multi-gear transmission thereof, the output shaft and the input shaft are coaxially arranged to form a shaft with two mutually rotatable ends. Compared with the multi-gear transmission in the prior art, an auxiliary box for switching the high and low gears is reduced, and the size of the inverted multi-gear transmission is effectively reduced. And under the condition that the number of gears of the inverted multi-gear transmission is not changed, compared with the multi-gear transmission in the prior art, the length of the intermediate shaft is not changed, and the lengths of the input shaft and the output shaft are reduced in different degrees, so that the arrangement of the gear shifting gear pair assembly and the normally meshed gear pair assembly on the input shaft, the intermediate shaft and the output shaft is more compact, and the size of the inverted multi-gear transmission is further reduced. Furthermore, the arrangement of the normally meshed gear pair assembly can enable the inverted multi-gear transmission to realize the multiplication of the gear number, so that the inverted multi-gear transmission can realize multi-gear transmission and reduce the transmission stage number at the same time so as to improve the transmission efficiency. Therefore, the automobile and the inverted multi-gear transmission thereof have the advantages that the size is reduced while the high transmission efficiency is ensured.

Drawings

FIG. 1 is a schematic structural diagram of an inverted multiple speed transmission in accordance with a preferred embodiment of the present invention;

FIG. 2 is a drive diagram of the inverted multispeed transmission of FIG. 1.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1, the present invention provides an automotive vehicle (not shown) and an inverted multiple speed transmission 10 therefor. The vehicle includes an inverted multispeed transmission 10. The automobile can be a new energy automobile, a conventional energy automobile or a hybrid electric automobile and the like.

Referring to fig. 2, the inverted multiple speed transmission 10 according to the preferred embodiment of the present invention includes a housing 100, an input shaft 200, an output shaft 300, a countershaft 400, a shifting gear pair assembly 500 and a constant mesh gear pair assembly 600.

Referring to fig. 1 again, the housing 100 has a hollow structure with a receiving cavity 110. The housing 100 mainly functions as a support and a fixing. Generally, the housing 100 is made of a metal material with high strength, such as stainless steel, cast steel, alloy steel, cast iron, and cast aluminum, so that the housing 100 has a high bearing capacity. A partition 120 is disposed in the accommodating chamber 110 to divide the accommodating chamber 110 into a first chamber 111 and a second chamber 112. The first chamber 111 and the second chamber 112 may be communicated with each other or separated from each other. The partition 120 may be fixedly connected to the inner wall of the receiving cavity 110 by a screw connection, or may be integrally formed with the inner wall of the receiving cavity 110 by a casting process.

The input shaft 200 is coaxially disposed and rotatably connected to the output shaft 300. One end of the input shaft 200 is rotatably inserted through the partition 120, and the other end thereof is rotatably connected to the sidewall of the housing 100 through the first chamber 111. The input shaft 200 is mainly used for supporting and is generally made of stainless steel, carbon steel, alloy steel, and other materials with high strength.

An end of the output shaft 300 remote from the input shaft 200 is rotatably connected to a sidewall of the housing 100 through the second chamber 112. The material of output shaft 300 is the same as that of intermediate shaft 400 and input shaft 200. It is understood that in other embodiments, the materials of the input shaft 200, the intermediate shaft 400 and the output shaft 300 may be different, as long as the requirements of supporting strength and torsional rigidity are met. The output shaft 300 is coaxially disposed with the input shaft 200 to form a shaft having both ends rotatable with respect to each other.

Specifically, the positional relationship and the connection relationship between the output shaft 300 and the input shaft 200 include the following two cases: in the first case, one end of the output shaft 300 near the input shaft 200 is rotatably mounted on the partition 120 and rotatably connected with the input shaft 200; in the second case, the end of the input shaft 200 adjacent the output shaft 300 extends into the second chamber 112 and is rotatably connected to the output shaft 300. The intermediate shaft 400 is rotatably mounted to the side wall of the housing 100. The intermediate shaft 400 is disposed in parallel with and spaced from the input shaft 200 and the output shaft 300. Therefore, the input shaft 200, the intermediate shaft 400, and the output shaft 300 form two shafts parallel to each other and spaced apart from each other in the housing 100.

Specifically, both ends of the intermediate shaft 400 are rotatably connected to the opposite side walls of the housing 100. Specifically, in the present embodiment, the material of the intermediate shaft 400 is the same as that of the input shaft 200 and the output shaft 300. It is understood that in other embodiments, the material of intermediate shaft 400 may be different from the material of input shaft 200, so long as both input shaft 200 and intermediate shaft 400 have greater support strength and torsional rigidity.

In this embodiment, the intermediate shaft 400 is rotatably inserted through the partition 120. One end of the intermediate shaft 400 is rotatably connected to the sidewall of the housing 100 through the first chamber 111, and the other end is rotatably connected to the sidewall of the housing 100 through the second chamber 112. Therefore, the housing 100 forms a three-point supporting structure for the intermediate shaft 400, which not only makes the structure of the intermediate shaft 400 in the inverted multi-speed transmission 10 more stable, but also greatly reduces the probability of the conditions of fracture, deformation and the like of the intermediate shaft 400 in the using process, and effectively improves the reliability of the inverted multi-speed transmission 10.

Therefore, compared with the prior art in which the input shaft 200, the intermediate shaft 400 and the output shaft 300 are arranged in parallel and at intervals, the arrangement mode of the two shafts arranged in parallel and at intervals is formed among the input shaft 200, the intermediate shaft 400 and the output shaft 300, so that the size of the inverted multi-speed transmission 10 in the direction perpendicular to the axis of the intermediate shaft 400 is effectively reduced, and the volume of the inverted multi-speed transmission 10 is smaller.

In the present embodiment, the input shaft 200, the intermediate shaft 400, and the output shaft 300 are rotatably inserted through the side wall of the housing 100 by the mounting bearing 700. The main function of the bearing is to support the mechanical rotator, reduce the friction coefficient in the movement process and ensure the rotation precision. Therefore, the use of the mounting bearing 700 effectively ensures the rotational accuracy of the input shaft 200, the intermediate shaft 400, and the output shaft 300, so that the operation of the inverted multispeed transmission 10 is more accurate.

When the mounting bearing 700 is mounted at different mounting positions, the structure, model, specification, and the like of the mounting bearing 700 are different depending on the requirements such as the force applied to the mounting bearing 700 by the mounting position, the use accuracy, and the like.

Further, the intermediate shaft 400 is rotatably inserted through the partition plate 120 by a mounting bearing 700. Therefore, the intermediate shaft 400 is rotatably mounted to the spacer 120 via the mounting bearing 700, which effectively ensures the rotation accuracy of the output shaft 300, resulting in more accurate operation of the inverted multi-speed transmission 10. Therefore, the mounting bearing 700 is provided between the intermediate shaft 400 and the spacer 120, and the rotation accuracy of the intermediate shaft 400 is improved while the support strength of the intermediate shaft 400 is ensured.

The shift gear pair assembly 500 is located within the first cavity 111. The shift gear subassembly 500 includes a shift master gear assembly 510, a shift slave gear assembly 520, and a shift synchronizer assembly 530. The gear shift driving gear assembly 510 is fixedly installed on the input shaft 200. The gear shifting driven gear assembly 520 is rotatably sleeved on the middle shaft 400 and is in transmission connection with the gear shifting driven gear assembly 520. Thus, shift driving gear assembly 510 on input shaft 200 rotates to rotate shift driven gear assembly 520, and shift driven gear assembly 520 rotates countershaft 400 through synchronizer assembly 530.

The shift driving gear assembly 510 includes at least one shift driving gear and the shift driven gear assembly 520 includes at least one shift driven gear. The at least one shifting driving gear and the at least one shifting driven gear are respectively in one-to-one correspondence. Each gear shifting driving gear is meshed with a corresponding gear shifting driven gear to form a gear pair of one gear. Thus, the shifting gear set assembly 500 includes at least one gear set.

Shift synchronizer assembly 530 is mounted on countershaft 400. The shift synchronizer assembly 530 includes at least one shift synchronizer. The shift synchronizer is used to synchronize the rotation of one of the shift driven gears with countershaft 400. Therefore, the rotary shift driven gear assembly 520 can drive the intermediate shaft 400 to rotate, so that power is transmitted from the input shaft 200 to the intermediate shaft 400 under the transmission action of the shift driving gear assembly 510 and the shift driven gear assembly 520.

A constant mesh gear pair assembly 600 is located within the second chamber 112. The constant mesh gear pair assembly 600 includes a constant mesh drive gear assembly 610, a constant mesh driven gear assembly 620, and a constant mesh synchronizer assembly 630. The constant mesh driving gear assembly 610 is fixedly arranged on the middle shaft 400, and the constant mesh driven gear assembly 620 is rotatably sleeved on the output shaft 300 and is in transmission connection with the constant mesh driving gear assembly 610. Thus, the rotating intermediate shaft 400 can drive the normally meshed driving gear assembly 610 to rotate, and the driving normally meshed driving gear assembly 610 can drive the normally meshed driven gear assembly 620 to rotate.

Specifically, the constant mesh drive gear assembly 610 includes at least two constant mesh drive gears. The constant mesh driven gear assembly 620 includes at least two constant mesh driven gears. The at least two normally meshed driving gears and the at least two normally meshed driven gears are respectively in one-to-one correspondence. Each constant mesh driving gear is meshed with the corresponding constant mesh driven gear to form a gear pair of one gear. Thus, constant mesh gear set assembly 600 includes at least two gear stages of gear pairs. The number of gears in the inverted multiple-speed transmission 10 is equal to the number of gear pairs in the shifting gear pair assembly 500 × the number of gear pairs in the constant-mesh gear pair assembly 600.

A constant mesh synchronizer assembly 630 is mounted on the output shaft 300. The constant mesh synchronizer assembly 630 includes at least one constant mesh synchronizer. The constant mesh synchronizer is used to synchronize rotation of one of the constant mesh driven gears with the output shaft 300. Therefore, the rotating constant mesh driven gear drives the output shaft 300 to rotate through the constant mesh synchronizer assembly 630, so that power is transmitted from the intermediate shaft 400 to the output shaft 300 under the transmission action of the constant mesh driving gear assembly 610 and the constant mesh driven gear assembly 620.

Therefore, the normally meshed driving gear assembly 610 includes at least two normally meshed driving gears, and the normally meshed driven gears include at least two normally meshed driven gears of the assembly 620, so that the arrangement of the normally meshed gear pair assembly 600 can realize the multiplication of the gear number of the inverted multi-gear transmission 10, and the inverted multi-gear transmission 10 can realize multi-gear transmission and reduce the transmission number at the same time, so as to improve the transmission efficiency.

The inverted multi-gear transmission 10 can realize inverted transmission, so that the normally meshed gear pair assembly 600 can be used for switching high and low gears, compared with the multi-gear transmission in the prior art, an auxiliary box for switching high and low gears is reduced, and the volume of the inverted multi-gear transmission 10 is effectively reduced. Moreover, under the condition that the number of gears of the inverted multi-gear transmission 10 is not changed, compared with the multi-gear transmission in the prior art, the length of the intermediate shaft 400 is not changed, and the lengths of the input shaft 200 and the output shaft 300 are reduced to different degrees, so that the arrangement of the shifting gear pair assembly 500 and the constant meshing gear pair assembly 600 on the input shaft 200, the intermediate shaft 400 and the output shaft 300 is more compact, and the volume of the inverted multi-gear transmission 10 is further reduced. Thus, the arrangement of the input shaft 200, the intermediate shaft 400, and the output shaft 300 described above makes the reverse-type multispeed transmission 10 smaller in size.

Therefore, the inverted multispeed transmission 10 has a reduced size while ensuring high transmission efficiency.

Referring to fig. 1 again, in the present embodiment, an end surface of the output shaft 300 near one end of the first cavity 111 is provided with a mounting hole 310. One end of the input shaft 200 near the output shaft 300 extends into the second chamber 112 and rotatably penetrates the mounting hole 310. Therefore, the output shaft 300 can be directly and rotatably connected with the input shaft 200, a mounting structure that one end of the output shaft 300 close to the input shaft 200 is mounted on the shell 100 is omitted, the size of the inverted multi-speed transmission 10 along the axial direction of the input shaft 200 is further reduced, and the volume of the inverted multi-speed transmission 10 is further reduced.

Further, in the present embodiment, the mounting hole 310 is a through hole provided in the axial direction of the output shaft 300. The mounting hole 310 is a through hole, which effectively reduces the mass of the output shaft 300, so that the inverted multi-speed transmission 10 is light and convenient to meet the requirement of light weight.

Further, in the present embodiment, the inverted multispeed transmission 10 further includes a connecting bearing 800. One end of the input shaft 200 is rotatably inserted into the mounting hole 310 through the connection bearing 800. Thereby, the connection bearing 800 is sandwiched between the hole wall of the mounting hole 310 and the outer wall of the input shaft 200. The main function of the bearing is to support the mechanical rotator, reduce the friction coefficient in the movement process and ensure the rotation precision. Therefore, the use of the coupling bearing 800 effectively ensures the rotation accuracy of the output shaft 300, so that the operation of the inverted multispeed transmission 10 is more accurate.

In another embodiment, the end surface of the input shaft 200 near the end of the second cavity 112 is provided with a connecting hole (not shown). One end of the output shaft 300 close to the first cavity 111 is rotatably disposed through the connecting hole. The mounting relationship of the output shaft 300 includes the following two cases: in the first case, one end of the input shaft 200 close to the output shaft 300 does not extend into the second chamber 112, and one end of the output shaft 300 rotatably penetrates into the connection and is rotatably connected with the partition 120; in the second case, one end of the input shaft 200 close to the output shaft 300 extends into the second chamber 112, and one end of the output shaft 300 rotatably penetrates the connecting hole.

Referring to fig. 1 and fig. 2 again, in the present embodiment, the shift driving gear assembly 510 includes a first-gear driving gear 511, a second-gear driving gear 512, a third-gear driving gear 513 and a fourth-gear driving gear 514 that are sequentially disposed at intervals and fixed on the input shaft 200. Thus, the at least one shift drive gear includes a first gear drive gear 511, a second gear drive gear 512, a third gear drive gear 513, and a fourth gear drive gear 514.

The gear shifting driven gear assembly 520 includes a first-gear driven gear 521, a second-gear driven gear 522, a third-gear driven gear 523 and a fourth-gear driven gear 524, which are sequentially and alternately and rotatably sleeved on the countershaft 400. Thus, the at least one shift driven gear includes a first-speed driven gear 521, a second-speed driven gear 522, a third-speed driven gear 523, and a fourth-speed driven gear 524. The first-gear driving gear 511, the second-gear driving gear 512, the third-gear driving gear 513, and the fourth-gear driving gear 514 are engaged with the first-gear driven gear 521, the second-gear driven gear 522, the third-gear driven gear 523, and the fourth-gear driven gear 524, respectively.

Thus, the input shaft 200 rotates to drive the first-gear driving gear 511, the second-gear driving gear 512, the third-gear driving gear 513 and the fourth-gear driving gear 514 to rotate, and the rotating first-gear driving gear 511, the second-gear driving gear 512, the third-gear driving gear 513 and the fourth-gear driving gear 514 can respectively drive the first-gear driven gear 521, the second-gear driven gear 522, the third-gear driven gear 523 and the fourth-gear driven gear 524 to rotate.

The shift synchronizer assembly 530 includes a first-gear synchronizer 531 and a third-fourth-gear synchronizer 532. Thus, the at least one shift synchronizer includes a second gear synchronizer 531 and a third and fourth gear synchronizer 532. A second gear synchronizer 531 and a third and fourth gear synchronizer 532 are both disposed on the countershaft 400. A second-gear synchronizer 531 is located between the first-gear driven gear 521 and the second-gear driven gear 522. The third-fourth synchronizer 532 is located between the third driven gear 523 and the fourth driven gear 524.

Thus, the shifting gear pair assembly 500 includes four forward gears, the first driving gear 511 is engaged with the first driven gear 521 to form a first gear pair; the second-gear driving gear 512 is meshed with the second-gear driven gear 522 to form a second-gear pair; the third-gear driving gear 513 is meshed with the third-gear driven gear 523 to form a third-gear pair; the fourth driving gear 514 meshes with the fourth driven gear 524 to form a fourth gear pair.

Specifically, when the first and second-gear synchronizer 531 is engaged in the first gear, the third and fourth-gear synchronizer 532 is in a neutral state, and the first-gear driven gear 521 is fixedly connected with the intermediate shaft 400; when the third-fourth gear synchronizer 532 is engaged with the second gear, the third-fourth gear synchronizer 532 is in a neutral state, and the second-gear driven gear 522 is fixedly connected with the intermediate shaft 400; when the third and fourth gear synchronizer 532 is engaged with a third gear, the second and fourth gear synchronizer 531 is in a neutral state, and the third gear driven gear 523 is fixedly connected with the intermediate shaft 400; when the third and fourth gear synchronizer 532 is engaged in the fourth gear, the second and fourth gear synchronizer 531 is in the neutral state, and the fourth gear driven gear 524 is fixedly connected with the intermediate shaft 400.

Further, in the present embodiment, the constant mesh driving gear assembly 610 includes a high-speed driving gear 611 and a low-speed driving gear 612 that are sequentially disposed at intervals and fixedly disposed on the intermediate shaft 400. The constant mesh driven gear assembly 620 includes a high-speed driven gear 621 and a low-speed driven gear 622 that are sequentially disposed at intervals and rotatably sleeved on the output shaft 300. The high-speed drive gear 611 and the low-speed drive gear 612 are engaged with the high-speed driven gear 621 and the low-speed driven gear 622, respectively. Thus, the high-speed driving gear 611 is engaged with the high-speed driven gear 621 to form a high-speed gear pair; the low drive gear 612 meshes with the low driven gear 622 to form a low gear pair. The constantly meshing gear pair assembly 600 includes two gears, a constantly meshing high gear and a constantly meshing low gear.

The constant mesh synchronizer assembly 630 includes a high and low gear synchronizer 631 disposed on the output shaft 300. The high-low synchronizer 631 is located between the high driven gear 621 and the low driven gear 622. Thus, the at least one normally engaged synchronizer includes the high and low gear synchronizer 631.

Specifically, when the high-low gear synchronizer 631 is engaged with a normally engaged low gear, the low-gear driven gear 622 and the output shaft 300 form a fixed connection, and the four forward gears and the normally engaged low gear form a first gear, a second gear, a third gear and a fourth gear; when the high-low gear synchronizer 631 is engaged in the normally engaged high gear, the low-gear driven gear 622 and the output shaft 300 are fixedly connected, and the four forward gears and the normally engaged high gear form a fifth gear, a sixth gear, a seventh gear and an eighth gear. Thus. The inverted multiple speed transmission 10 is an eight speed transmission.

Further, in the present embodiment, the first-speed driven gear 521, the second-speed driven gear 522, the third-speed driven gear 523, and the fourth-speed driven gear 524 are rotatably fitted to the countershaft 400 by the needle bearing 1001. The high-speed driven gear 621 and the low-speed driven gear 622 are rotatably fitted to the output shaft 300 by a ball bearing 1001. Accordingly, the needle roller bearings 1001 provide the first-speed driven gear 521, the second-speed driven gear 522, the third-speed driven gear 523, the fourth-speed driven gear 524, and the high-speed driven gear 621 and the low-speed driven gear 622 with higher rotation accuracy, and the inverted multi-speed transmission 10 operates more accurately.

When the needle roller bearings 1001 are attached to different attachment portions, the needle roller bearings 1001 are different in structure, model, specification, and the like depending on the requirements such as the force applied to the attachment bearing 700 by the attachment portions and the use accuracy.

In the present embodiment, the reverse-type multiple speed transmission 10 further includes a reverse assembly 900. The reverse assembly 900 includes a reverse shaft 910, a reverse idler 920, a reverse driven gear 930, and a reverse synchronizer 940. The reverse shaft 910 is received and fixed in the first cavity 111, and is parallel to and spaced apart from the input shaft 200 and the intermediate shaft 400, respectively. The reverse idle gear 920 and the reverse driven gear 930 are rotatably fitted to the reverse shaft 910 and the countershaft 400, respectively. Thus, the reverse shaft 910, the input shaft 100, and the intermediate shaft 200 are arranged in a triangular shape. Reverse synchronizer 940 is disposed on countershaft 400. The reverse idler gear 920 is engaged with the shift driving gear assembly 510 and the reverse driven gear 930, respectively.

Specifically, during reverse gear operation, one of the shift drive gears in the shift drive gear assembly 510 may act as a reverse drive gear, and the reverse idler gear 920 is engaged with the reverse drive gear in the shift drive gear assembly 510. When the shift driving gear assembly 510 includes the first gear driving gear 511, the second gear driving gear 512, the third gear driving gear 513 and the fourth gear driving gear 514, the first gear driving gear 511 can be used as a reverse gear driving gear, and the reverse gear idler 920 is engaged with the first gear driving gear 511.

Through the setting of reverse gear assembly 900, increase a reverse gear function for the car, satisfy the requirement of backing a car of car.

Specifically, when the reverse gear assembly 900 is in operation, the reverse gear synchronizer 940 is engaged with the reverse gear driven gear 930, and power on the input shaft 200 is transmitted to the output shaft 300 through the gear shifting driving gear assembly 510, the reverse gear idle gear 920, the reverse gear driven gear 930, the intermediate shaft 400, the normally meshed driving gear assembly 610 and the normally meshed driven gear assembly 620 and is output, so that the automobile is driven in reverse.

Further, in the present embodiment, the reverse gear assembly 900 further includes a reverse gear bearing 950. The reverse idle gear 920 and the reverse driven gear 930 are rotatably fitted to the reverse shaft 910 and the countershaft 400 through a reverse bearing 950, respectively. The reverse bearing 950 may be a needle bearing, a ball bearing, or the like. The reverse bearing 950 effectively improves the rotation accuracy of the reverse idler gear 920 and the intermediate shaft 400, and further improves the operation accuracy of the reverse assembly 900.

In the above-mentioned automobile and the inverted multi-speed transmission 10 thereof, the output shaft 300 is coaxially disposed with the input shaft 200 to constitute a shaft whose both ends are rotatable with each other. The inverted multi-gear transmission 10 can realize inverted transmission, so that the normally meshed gear pair assembly 600 can be used for switching high and low gears, compared with the multi-gear transmission in the prior art, an auxiliary box for switching high and low gears is reduced, and the volume of the inverted multi-gear transmission 10 is effectively reduced. Moreover, under the condition that the number of gears of the inverted multi-gear transmission 10 is not changed, compared with the multi-gear transmission in the prior art, the length of the intermediate shaft 400 is not changed, and the lengths of the input shaft 200 and the output shaft 300 are reduced to different degrees, so that the arrangement of the shifting gear pair assembly 500 and the constant mesh gear pair assembly 600 on the input shaft 200, the intermediate shaft 400 and the output shaft 300 is more compact, and the volume of the inverted multi-gear transmission 10 is further reduced. Further, the arrangement of the constant-meshing gear pair assembly 600 can multiply the gear number of the inverted multi-gear transmission 10, so that the inverted multi-gear transmission 10 can realize multi-gear transmission and reduce the transmission number of stages at the same time, thereby improving the transmission efficiency. Therefore, the automobile and the inverted multi-speed transmission 10 thereof have the advantages of high transmission efficiency and reduced volume.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.