阅读说明：本技术 一种气动式分动箱 (Pneumatic transfer case ) 是由 林春为 邓清华 于 2019-11-14 设计创作，主要内容包括：本发明涉及一种气动式分动箱,包括箱体、档位切换装置、滑动齿套装置、高速输入齿轮、中间常啮合齿轮、中间低速齿轮和中间高速齿轮,输入齿轮轴、后驱动轴、前驱动轴和中间花键轴分别可转动地设于箱体上,档位切换装置可滑动地安装在箱体上,高速输入齿轮固定在输入齿轮轴上,中间常啮合齿轮固装在中间花键轴上且中间常啮合齿轮传动连接后驱动轴,中间常啮合齿轮可断开的传动连接前驱动轴,中间花键轴具有第一花键段,档位切换装置夹持滑动齿套装置沿第一花键段滑动,滑动齿套装置在自由状态时为打开状态,滑动齿套装置处于打开状态时将第一花键段、中间低速齿轮和中间高速齿轮均周向固定,能够在停车后自动驻车,防止车辆溜坡。(The invention relates to a pneumatic transfer case, which comprises a case body, a gear switching device, a sliding gear sleeve device, a high-speed input gear, a middle constant mesh gear, a middle low-speed gear and a middle high-speed gear, wherein an input gear shaft, a rear driving shaft, a front driving shaft and a middle spline shaft are respectively and rotatably arranged on the case body, the gear switching device is slidably arranged on the case body, the high-speed input gear is fixed on the input gear shaft, the middle constant mesh gear is fixedly arranged on a middle spline shaft, the middle constant mesh gear is in transmission connection with the rear driving shaft, the middle constant mesh gear is in disconnectable transmission connection with the front driving shaft, the middle spline shaft is provided with a first spline section, the gear switching device clamps the sliding gear sleeve device to slide along the first spline section, the sliding gear sleeve device is in an open state when in a free state, and the sliding gear sleeve device circumferentially fixes the first spline section, the middle low, the parking device can automatically park after parking, and prevent the vehicle from sliding down the slope.)

1. A pneumatic transfer case which is characterized in that: the gearbox comprises a box body, an input gear shaft, a rear driving shaft, a front driving shaft, a gear switching device, a sliding gear sleeve device, a high-speed input gear, a middle spline shaft, a middle constant mesh gear, a middle low-speed gear and a middle high-speed gear, wherein the input gear shaft, the rear driving shaft, the front driving shaft and the middle spline shaft are respectively and rotatably arranged on the box body, the gear switching device is slidably arranged on the box body, the high-speed input gear is fixed on the input gear shaft, the middle constant mesh gear is fixedly arranged on the middle spline shaft and is in transmission connection with the rear driving shaft, the middle constant mesh gear is in transmission connection with the front driving shaft in a disconnectable way, the middle low-speed gear and the middle high-speed gear are respectively and axially fixed on the middle spline shaft and are respectively and correspondingly meshed with the input gear shaft and, the gear shifting device clamping sliding gear sleeve device slides along the first spline section, the sliding gear sleeve device is in an open state in a free state and is in a closed state under the clamping of the gear shifting device, and the sliding gear sleeve device circumferentially fixes the first spline section, the middle low-speed gear and the middle high-speed gear when in the open state.

2. A pneumatic transfer case according to claim 1 wherein: the sliding gear sleeve device comprises a first gear sleeve, a second gear sleeve and a pressure spring, wherein the first gear sleeve and the second gear sleeve are circumferentially fixed with each other, the first gear sleeve is provided with a first guide ring, the second gear sleeve is provided with a second guide ring, the pressure spring is positioned between the first gear sleeve and the second gear sleeve, two ends of the pressure spring are respectively abutted to the first gear sleeve and the second gear sleeve, the gear switching device respectively clamps the first guide ring and the second guide ring, and the first gear sleeve and the second gear sleeve respectively fix the middle low-speed gear and the middle high-speed gear with the first spline section in the circumferential direction and fix the first gear sleeve and the second gear sleeve by the gear switching device in the axial direction under the action of the pressure spring.

3. A pneumatic transfer case according to claim 2 wherein: the first gear sleeve is provided with an embedding shaft, the second gear sleeve is provided with an embedding hole, and the embedding shaft extends into the embedding hole to circumferentially fix the first gear sleeve and the second gear sleeve.

4. A pneumatic transfer case according to claim 1 wherein: the middle low-speed gear and the middle high-speed gear are respectively arranged on the middle spline shaft through roller bearings.

5. A pneumatic transfer case according to claim 1 wherein: the gear switching device comprises a high-low gear assembly, a parking gear assembly and a high-low gear shifting fork shaft, wherein the high-low gear assembly and the high-low gear shifting fork shaft are both installed on the box body, a centering block is arranged on the high-low gear shifting fork shaft, the high-low gear assembly pushes the high-low gear shifting fork shaft to axially slide, the parking gear assembly comprises a first shifting fork, a second shifting fork and a shifting fork cylinder, a cylinder body and a piston rod of the shifting fork cylinder are fixedly installed on the first shifting fork and the second shifting fork respectively, and the first shifting fork and the second shifting fork clamp the sliding gear sleeve device and the centering block under the action of the shifting fork cylinder.

6. A pneumatic transfer case according to claim 5 wherein: the high-low gear shifting fork shaft is provided with a first clamp spring and a second clamp spring, the first clamp spring and the second clamp spring are respectively positioned on the high-low gear shifting fork shafts on two sides of the parking gear assembly, and the sliding gear sleeve device pushes two sides of the parking gear assembly to be respectively abutted against the first clamp spring and the second clamp spring in a free state.

7. A pneumatic transfer case according to claim 1 wherein: the pneumatic transfer case further comprises a front driving gear, a third gear sleeve and a four-drive switching device, wherein the front driving shaft comprises a second spline section, the front driving gear is fixedly arranged on the front driving shaft in the circumferential direction and meshed with a middle constant meshed gear, and the third gear sleeve slides along the second spline section under the driving of the four-drive switching device and enables the third gear sleeve, the second spline section and the front driving gear to be fixed in the circumferential direction.

8. A pneumatic transfer case according to claim 7 wherein: the four-wheel drive switching device comprises a four-wheel drive shifting fork shaft and a third shifting fork, the four-wheel drive shifting fork shaft is fixedly arranged on the box body in a sliding mode, the third shifting fork is fixedly arranged on the four-wheel drive shifting fork shaft, and the third shifting fork and the third gear sleeve are axially fixed.

Technical Field

The invention relates to the technical field of transfer cases, in particular to a pneumatic transfer case.

Background

The transfer case is a device for distributing power of the engine, and can output the power to the rear axle or to both the front and rear axles. From this perspective, it can be seen that the transfer case is actually a fitting on a four-wheel drive vehicle. With the development of the four-wheel drive technology, the transfer case is also changed all the time, and the transfer case with different styles is gradually formed, and the basic principles and the functions of the transfer case are different from those of the four-wheel drive vehicle matched with different requirements.

However, the existing transfer case has no parking function, and when the transfer case is parked, if the hand brake is forgotten to be pulled, the transfer case is parked on a slope, so that the transfer case is easy to slide and accidents are caused.

Disclosure of Invention

In order to overcome the technical defects in the prior art, the invention provides a pneumatic transfer case which can automatically park after parking and prevent a vehicle from sliding down a slope.

The technical solution adopted by the invention is as follows: a pneumatic transfer case comprises a case body, an input gear shaft, a rear driving shaft, a front driving shaft, a gear switching device, a sliding gear sleeve device, a high-speed input gear, a middle spline shaft, a middle constant meshed gear, a middle low-speed gear and a middle high-speed gear, wherein the input gear shaft, the rear driving shaft, the front driving shaft and the middle spline shaft are respectively and rotatably arranged on the case body, the gear switching device is slidably arranged on the case body, the high-speed input gear is fixed on the input gear shaft, the middle constant meshed gear is fixedly arranged on the middle spline shaft and is in transmission connection with the rear driving shaft, the middle constant meshed gear is in disconnectable transmission connection with the front driving shaft, the middle low-speed gear and the middle high-speed gear are respectively and axially fixed on the middle spline shaft and are respectively and correspondingly meshed with the input gear shaft, the middle spline shaft is provided with a first spline section, the gear switching device clamping sliding gear sleeve device slides along the first spline section, the sliding gear sleeve device is in an open state in a free state and is in a closed state under the clamping of the gear switching device, and the sliding gear sleeve device circumferentially fixes the first spline section, the middle low-speed gear and the middle high-speed gear when in the open state.

As a further improvement of the present invention, the sliding gear sleeve device includes a first gear sleeve, a second gear sleeve and a pressure spring, the first gear sleeve and the second gear sleeve are circumferentially fixed to each other, the first gear sleeve is provided with a first guide ring, the second gear sleeve is provided with a second guide ring, the pressure spring is located between the first gear sleeve and the second gear sleeve, two ends of the pressure spring are respectively abutted to the first gear sleeve and the second gear sleeve, the gear shifting device respectively clamps the first guide ring and the second guide ring, when the first gear sleeve and the second gear sleeve are in an open state under the action of the pressure spring, the first gear sleeve and the second gear sleeve respectively circumferentially fix the intermediate low-speed gear and the intermediate high-speed gear with the first spline section, and the first gear sleeve and the second gear sleeve are axially fixed by the gear shifting device.

As a further improvement of the present invention, the first gear sleeve is provided with an embedding shaft, the second gear sleeve is provided with an embedding hole, and the embedding shaft extends into the embedding hole to fix the first gear sleeve and the second gear sleeve circumferentially.

As a further improvement of the present invention, the intermediate low-speed gear and the intermediate high-speed gear are respectively mounted on the intermediate spline shaft by roller bearings.

As a further improvement of the invention, the gear switching device comprises a high-low gear assembly, a parking gear assembly and a high-low gear shift shaft, wherein the high-low gear assembly and the high-low gear shift shaft are both mounted on the box body, a centering block is arranged on the high-low gear shift shaft, the high-low gear assembly pushes the high-low gear shift shaft to axially slide, the parking gear assembly comprises a first shifting fork, a second shifting fork and a shifting fork cylinder, a cylinder body and a piston rod of the shifting fork cylinder are respectively and fixedly mounted on the first shifting fork and the second shifting fork, and the first shifting fork and the second shifting fork clamp the sliding gear sleeve device and the centering block under the action of the shifting fork cylinder.

As a further improvement of the invention, the high-low gear shift fork shaft is provided with a first snap spring and a second snap spring, the first snap spring and the second snap spring are respectively positioned on the high-low gear shift fork shaft at two sides of the parking gear assembly, and the sliding gear sleeve device pushes two sides of the parking gear assembly to be respectively abutted with the first snap spring and the second snap spring in a free state.

As a further improvement of the invention, the pneumatic transfer case further comprises a front drive gear, a third gear sleeve and a four-drive switching device, wherein the front drive shaft comprises a second spline section, the front drive gear is circumferentially and fixedly arranged on the front drive shaft and meshed with the middle constant meshed gear, and the third gear sleeve slides along the second spline section under the drive of the four-drive switching device and enables the third gear sleeve, the second spline section and the front drive gear to be circumferentially fixed with each other.

As a further improvement of the invention, the four-wheel drive switching device comprises a four-wheel drive shifting fork shaft and a third shifting fork, the four-wheel drive shifting fork shaft is fixedly arranged on the box body in a sliding manner, the third shifting fork is fixedly arranged on the four-wheel drive shifting fork shaft, and the third shifting fork and a third gear sleeve are axially fixed.

The invention has the beneficial effects that:

1: the input gear shaft and the intermediate spline shaft are respectively and rotatably arranged on the box body, the gear switching device is slidably arranged on the box body, the high-speed input gear is fixed on the input gear shaft, the gear switching device clamps the sliding gear sleeve device to slide along the first spline section, the sliding gear sleeve device is in an open state in a free state and is in a closed state under the clamping of the gear switching device, the sliding gear sleeve device circumferentially fixes the first spline section, the intermediate low-speed gear and the intermediate high-speed gear when in the open state, the intermediate low-speed gear and the intermediate high-speed gear are respectively and correspondingly meshed with the input gear shaft and the high-speed input gear, an air pump of a vehicle stops working when the vehicle is parked, the air source of a shifting fork air cylinder is lost, and the pressure spring pushes the first gear sleeve and the second gear sleeve to circumferentially fix the intermediate low-speed gear and the intermediate high-speed gear and the first spline section respectively, and the intermediate low, the middle spline shaft cannot rotate, the middle normally-meshed gear is locked, parking is further completed, and the phenomenon that the hand brake is forgotten to slip is avoided.

2: the middle constant mesh gear is fixedly arranged on the middle spline shaft and is in transmission connection with the rear driving shaft, the middle constant mesh gear is in transmission connection with the front driving shaft in a disconnectable manner, and when the front driving shaft is required to output power, the third gear sleeve slides along the second spline section under the driving of the four-drive switching device and enables the third gear sleeve, the second spline section and the front driving gear to be fixed circumferentially, so that the vehicle can be switched between two-drive and four-drive modes.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

FIG. 2 is a schematic sectional view taken along the direction C-C in FIG. 1.

Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

Fig. 4 is an enlarged schematic view of B in fig. 2.

Fig. 5 is a schematic view showing an opened state of the sliding sleeve gear.

Fig. 6 is a schematic view of the open state of the parking range assembly.

Description of reference numerals: 1. a box body; 21. an input gear shaft; 22. a high speed input gear; 3. a rear drive shaft; 41. a front drive shaft; 411. a second spline section; 42. a front drive gear; 51. a high-low gear component; 52. a high-low gear shifting fork shaft; 521. a first clamp spring; 522. a second clamp spring; 523. centering blocks; 53. a parking gear assembly; 531. a first shift fork; 532. a second fork; 533. a shifting fork cylinder; 6. a sliding gear sleeve device; 61. a first gear sleeve; 611. a first guide ring; 612. embedding a shaft; 62. a second gear sleeve; 621. a second guide ring; 63. a pressure spring; 71. a middle spline shaft; 711. a first spline section; 712. a roller bearing; 72. an intermediate constant mesh gear; 73. an intermediate low-speed gear; 74. an intermediate high speed gear; 8. a third gear sleeve; 91. a four-wheel drive declutch shift shaft; 92. and a third shifting fork.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 to 6, the present embodiment provides a pneumatic transfer case, which includes a case 1, an input gear shaft 21, a rear driving shaft 3, a front driving shaft 41, a gear switching device, a sliding gear sleeve device 6, a high-speed input gear 22, a middle spline shaft 71, a middle constant mesh gear 72, a middle low-speed gear 73 and a middle high-speed gear 74, wherein the input gear shaft 21, the rear driving shaft 3, the front driving shaft 41 and the middle spline shaft 71 are respectively rotatably disposed on the case 1, and the shafts are mounted on the case 1 as in the prior art, which will not be described herein again.

In the present embodiment, the gear position switching device is slidably mounted on the case 1, the high-speed input gear 22 is fixed to the input gear shaft 21, the intermediate low-speed gear 73 and the intermediate high-speed gear 74 are respectively mounted on the intermediate spline shaft 71 through roller bearings 712 and are respectively axially fixed to the intermediate spline shaft 71, the intermediate low-speed gear 73 is meshed with the input gear shaft 21, the intermediate high-speed gear 74 is meshed with the high-speed input gear 22, and in this state, the intermediate low-speed gear 73 and the intermediate high-speed gear 74 rotate at different speeds.

In the present embodiment, the intermediate spline shaft 71 has a first spline section 711, the sliding sleeve gear 6 is in an open state in the free state and in a closed state with the gear position switching device sandwiched, and the sliding sleeve gear 6 circumferentially fixes the first spline section 711, the intermediate low-speed gear 73, and the intermediate high-speed gear 74 in the open state.

Wherein, the sliding gear sleeve device 6 comprises a first gear sleeve 61, a second gear sleeve 62 and a pressure spring 63, the first gear sleeve 61 is provided with an embedding shaft 612, the second gear sleeve 62 is provided with an embedding hole, the embedding shaft 612 extends into the embedding hole to fix the first gear sleeve 61 and the second gear sleeve 62 circumferentially, the first gear sleeve 61 is provided with a first guide ring 611, the second gear sleeve 62 is provided with a second guide ring 621, the pressure spring 63 is positioned between the first gear sleeve 61 and the second gear sleeve 62, two ends of the pressure spring 63 are respectively connected with the first gear sleeve 61 and the second gear sleeve 62 in a butting mode, the first gear sleeve 61 and the second gear sleeve 62 are respectively used for circumferentially fixing the middle low-speed gear 73 and the middle high-speed gear 74 with different angular speeds and the first spline section 711 when the first gear sleeve 61 and the second gear sleeve 62 are in an opening state under the action of the pressure spring 63, the middle spline shaft 71 cannot rotate, and the middle normally meshed gear 72 is locked, thereby completing the parking and preventing the vehicle from sliding caused by forgetting to pull the hand brake.

Wherein, the gear switching device comprises a high-low gear component 51, a parking gear component 53 and a high-low gear shifting fork shaft 52, the high-low gear component 51 and the high-low gear shifting fork shaft 52 are all installed on the box body 1, a centering block 523 is arranged on the high-low gear shifting fork shaft 52, the high-low gear component 51 pushes the high-low gear shifting fork shaft 52 to axially slide, the parking gear component 53 comprises a first shifting fork 531, a second shifting fork 532 and a shifting fork cylinder 533, a cylinder body and a piston rod of the shifting fork cylinder 533 are respectively and fixedly installed on the first shifting fork 531 and the second shifting fork 532, when the vehicle normally works, and the vehicle-mounted air pump supplies air to the shifting fork cylinder 533, the first shifting fork 611 and the second guiding ring 621 are clamped by the first shifting fork 531 and the second shifting fork 532 under the action of the shifting fork cylinder 533, meanwhile, the centering block 523 is clamped by the first shifting fork 531 and the second shifting fork 533, and the high-low gear shifting fork shaft 52 is axially positioned with the first shifting fork 531 and the second, under the drive of the axial movement of the high-low gear shifting fork shaft 52, the first gear sleeve 61 and the second gear sleeve 62 slide along the first spline section 711, so that the middle spline shaft 71 has three positions of a high gear, a neutral gear and a low gear; in the high gear position, the first and second gear sleeves 61, 62 are respectively engaged with the first spline section 711 and the intermediate high-speed gear 74; in the low gear position, the first and second gear sleeves 61 and 62 are engaged with the first spline section 711 and the intermediate low-speed gear 73, respectively; in the neutral position, the first and second gear sleeves 61, 62 are only engaged with the first spline section 711.

In this embodiment, the high-low gear shift fork shaft 52 is provided with a first snap spring 521 and a second snap spring 522, the first snap spring 521 and the second snap spring 522 are respectively located on the high-low gear shift fork shaft 52 on both sides of the parking gear assembly 53, when the vehicle stops flameout and the vehicle-mounted air pump does not supply air to the shift fork cylinder 533 any more, the pressure spring 63 is in a free state, and the pressure spring 63 pushes the first shift fork 531 and the second shift fork 532 to abut against the first snap spring 521 and the second snap spring 522 respectively, so that the axial positions of the first shift fork 531 and the second shift fork 532 are fixed, the first gear sleeve 61 and the second gear sleeve 62 are prevented from axially shifting after the vehicle is flameout, and the first gear sleeve 61 and the second gear sleeve 62 are convenient for circumferentially fixing the intermediate low-speed gear 73 and the intermediate high-speed gear 74 and the first spline section 711 at appropriate axial positions.

In the embodiment, the middle constant mesh gear 72 is fixedly arranged on the middle spline shaft 71, the middle constant mesh gear 72 is in transmission connection with the rear driving shaft 3, the middle constant mesh gear 72 is in disconnectable transmission connection with the front driving shaft 41, and the constant transmission of the rear driving shaft 3 and the selective transmission of the front driving shaft 41 are realized, so that the transfer is realized.

The pneumatic transfer case further comprises a front drive gear 42, a third gear sleeve 8 and a four-drive switching device, wherein the front drive shaft 41 comprises a second spline section 411, the front drive gear 42 is fixedly arranged on the front drive shaft 41 in the circumferential direction and meshed with a middle constant meshed gear 72, when the driving force output by the front drive shaft 41 is needed, the third gear sleeve 8 slides along the second spline section 411 under the driving of the four-drive switching device and enables the third gear sleeve 8, the second spline section 411 and the front drive gear 42 to be fixed in the circumferential direction, and the power of the middle spline shaft 71 is transmitted to the front drive shaft 41.

Specifically, the four-wheel drive switching device comprises a four-wheel drive shifting fork shaft 91 and a third shifting fork 92, the four-wheel drive shifting fork shaft 91 is fixedly arranged on the box body 1 in a sliding mode, the third shifting fork 92 is fixedly arranged on the four-wheel drive shifting fork shaft 91, the third shifting fork 92 and the third gear sleeve 8 are axially fixed, and the four-wheel drive shifting fork shaft 91 drives the third shifting fork 92 to further change the axial position of the third gear sleeve 8.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.