CN100520110C - Mini-car transfer case - Google Patents

Abstract

The invention relates to a minicar transfer case, and a driving gear, a bull gear and a pinion gear are arranged inside a case body which is formed by butt joint of a front cover and a rear cover of the transfer case, wherein, the bull gear is arranged between the driving gear and the pinion gear and meshed with the driving gear and the pinion gear on by one; a synchronizer soldered tooth is sleeved on an annular lug boss on the front part of the pinion gear; a synchronous ring is movably sleeved on a hollow cone on the front end of the synchronizer soldered tooth; a synchronizer fixed tooth is arranged on a transfer case output shaft on the front side of the synchronous ring; a synchronizer soldered toothed sleeve is sleeved on the synchronizer fixed tooth; an annular groove is arranged on the external surface of the synchronizer soldered toothed sleeve; a roller of a shift fork mechanism is clamped into the annular groove. The invention can lead a minicar to select two-wheel drive or four-wheel drive according to actual conditions, and switching between the two-wheel drive and the four-wheel drive is convenient and operation is simple, thereby the invention has the advantages of great improvement of climbing ability of the minicar, effective improvement of trafficability of motor vehicles, and great convenience brought to travel of people.

Description

A transfer case for a miniature car

technical field

The invention relates to a transmission device for a miniature automobile, in particular to a transfer case for a miniature automobile.

Background technique

At present, miniature cars generally use the rear wheel drive mode, that is, the power of the engine is first transmitted to the gearbox, and then the output shaft of the gearbox is transmitted to the rear axle through the rear drive shaft to drive the rear wheels to rotate, and the whole vehicle moves forward or backward. Drive backwards. A miniature car with only two rear-wheel drives cannot provide sufficient ground driving force when passing a road with a low adhesion coefficient; especially when passing through a muddy or muddy section, the driving wheels are prone to sinking into mud or slipping and cannot be driven. Thereby affecting the passability of automobile, brings great inconvenience to people's travel.

Contents of the invention

The technical problem to be solved by the present invention is to provide a transfer case for a miniature automobile capable of adopting two-wheel drive or four-wheel drive, so as to improve the passability and climbing ability of the miniature automobile.

The technical scheme of the present invention is as follows: a transfer case for a miniature car, including a drive gear assembled on the output shaft of the gearbox, the key is that the drive gear is located in the box formed by the docking of the front cover and the rear cover of the transfer case, The large gear and the output shaft of the transfer case are also supported between the front and rear covers of the transfer case, wherein the rear part of the output shaft of the transfer case is installed with a pinion through a bearing, and the front end of the output shaft of the transfer case is connected from the front cover of the transfer case. The front of the pinion protrudes; the big gear is located in the middle of the driving gear and the pinion, the big gear is the largest, and meshes with the driving gear and the pinion respectively; the ring boss at the front of the pinion is set with a synchronizer engagement tooth , the looper synchronizing ring on the hollow cone at the front end of the synchronizer engaging teeth, and the output shaft of the transfer case on the front side of the synchronizing ring is equipped with synchronizer fixed teeth, the synchronizer fixed teeth, the synchronizing ring and the synchronizer engaging teeth The outer circumferences of the three are provided with external splines of the same shape and size, and a synchronizer engaging gear sleeve is set on the synchronizer fixed teeth. The outer surface of the synchronizer engaging gear sleeve is provided with an annular groove. The roller snaps into the annular groove, and the shift fork of the shift fork mechanism passes through the outside of the front cover of the transfer case upwards.

Using the above technical scheme, the tail of the traditional mini-car gearbox is cut off, and the front cover of the transfer case has a joint surface suitable for the shape and size of the cut-off surface of the gearbox. The driving gear on the output shaft of the case is accommodated in the case formed by the docking of the front cover and the rear cover of the transfer case. The output shaft of the gearbox is still connected to the rear axle through the rear drive shaft, the output shaft of the transfer case is connected to the front axle through the front drive shaft, and the fork mechanism is connected to the handle of the transfer case in the cab through a flexible shaft. Under the control of the control handle of the moving box, the shift fork mechanism can drive the synchronizer engaging gear sleeve to slide on the synchronizer fixed teeth, the synchronizing ring and the synchronizer engaging teeth, so that the synchronizer fixed teeth and the synchronizer engaging teeth are separated or engaged. , The miniature car that transfer case of the present invention is housed can select only the drive form that rear wheel participates in or the drive form that front and rear wheel participates in simultaneously according to road conditions.

In the present invention, when the output shaft of the gearbox rotates under the drive of the engine power, the driving gear rotates together with the output shaft of the gearbox, and the output shaft of the gearbox transmits the power of the engine to the rear axle through the rear transmission shaft, driving the rear wheels to rotate, The driving gear drives the pinion to rotate through the bull gear. When the synchronizer engaging teeth on the annular boss of the pinion are separated from the synchronizer fixed teeth, the synchronizer engaging teeth rotate idly and the output shaft of the transfer case does not rotate. At this time The miniature car is driven by two rear wheels, which is suitable for driving on roads with good road conditions; when the synchronizer engaging teeth on the ring boss of the pinion are in engagement with the synchronizer fixed teeth, the synchronizer engaging teeth pass through the synchronizer The engaging gear sleeve drives the fixed gear of the synchronizer to rotate, and the fixed gear of the synchronizer drives the output shaft of the transfer case to rotate, so that the output shaft of the transfer case transmits part of the power of the engine to the front axle through the front drive shaft to drive the front wheels to rotate. At the same time, the front and rear wheels of the mini-car have driving force, which greatly enhances the climbing ability of the mini-car and effectively improves the passability of the car.

In order to simplify the structure and facilitate installation, the above-mentioned shift fork mechanism is composed of rollers, shift forks, shift fork shafts, shift fork shaft output plates and joints. Rollers are installed symmetrically on the head, and the handle of the shift fork is fixedly connected with the lower end of the shift fork shaft. The other end of the fork shaft output plate is installed with a joint.

The shank of the above-mentioned shift fork is sleeved on the shift fork shaft, and the two are fixed by bolts, so that the connection between the shift fork and the shift fork shaft is reliable and the installation is convenient.

A through hole is provided at the bottom end of the front cover of the transfer case, and a spring and a positioning pin are pierced in the through hole, and the outer end of the through hole is sealed by a threaded cover; one end of the positioning pin extends into the end surface of the shift fork In the groove provided above, the other end of the positioning pin abuts against one end of the spring, and the other end of the spring is limited by the threaded cover. The spring is in a state of constant compression. Under the action of the spring, the positioning pin bears against the shift fork to prevent it from shaking, thereby ensuring the stability and reliability of the movement of the shift fork and the synchronizer engaging the gear sleeve.

In order to facilitate the installation of the transmission output shaft and make the structure of the rear cover of the transfer case more compact, the output shaft of the above-mentioned transmission is supported on the rear cover of the transfer case through bearings, and the front end of the output shaft of the transmission extends out of the front cover of the transfer case In addition, the rear end of the transmission output shaft protrudes from the hollow cone at the rear of the transfer case rear cover.

A hollow truncated cone is integrally formed on the front part of the front cover of the above-mentioned transfer case. Protrude from the hollow frustum. In this way, the structure of the front cover of the transfer case is compact and the volume is small, which effectively reduces its production cost.

In order to facilitate assembly, the above-mentioned synchronizer engaging teeth and the annular boss of the pinion are connected by splines. The synchronizer engaging teeth are divided into front and rear sections, and external splines are arranged on the outer circumference of the rear section of the synchronizer engaging teeth. , the front section of the synchronizer engaging teeth is a hollow truncated cone, and the taper of the hollow truncated cone is adapted to the taper of the central hole of the synchronizing ring.

In order to improve the reliability of the transmission and ensure the consistency of rotation between the driving gear and the pinion, the centers of the driving gear, the large gear and the pinion are on a straight line, and the size of the driving gear and the pinion are equal and the direction of rotation is equal. same.

Beneficial effects: the present invention has the characteristics of ingenious conception, reasonable design, and easy implementation. It can make the miniature car choose two-wheel drive or four-wheel drive according to the actual situation, and it is convenient to switch between two-wheel drive and four-wheel drive, and the operation is simple. Thereby greatly enhancing the climbing ability of the miniature car, effectively improving the passability of the car, and bringing great convenience for people's travel.

Description of drawings

Fig. 1 is a schematic diagram of assembly of the present invention.

Fig. 2 is a schematic diagram of the structure of the present invention assembled together.

Fig. 3 is a structural schematic diagram of the fork mechanism in the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figures 1 and 2, the transfer case front cover 3 and the transfer case rear cover 4 are connected to each other to form a transfer case body, and the transfer case front and rear covers 3 and 4 are fixed by bolts. The front portion of one side of the transfer case front cover 3 is integrally formed with a hollow truncated cone, and the front end face of the other side of the transfer case front cover 3 is adapted to the shape and size of the tail end face of the gearbox 22, so that the splitter can be separated by bolts. The moving box casing is fixed on the gearbox 22. The output shaft 1 of the gearbox is supported on the rear cover 4 of the transfer case through bearings, and the front end of the output shaft 1 of the gearbox extends out of the front end of the front cover 3 of the transfer case and extends into the gearbox 22; the output shaft of the gearbox The rear end of 1 stretches out from the integrally formed hollow frustum of transfer case rear cover 4 rear parts, and can be connected with rear transmission shaft 23. A driving gear 2 is sleeved on the transmission output shaft 1, and the driving gear 2 is located in the case body of the transfer case, and the driving gear 2 can rotate together with the transmission output shaft 1.

It can be seen from Fig. 1 and Fig. 2 that a large gear 9 and a transfer case output shaft 6 are installed in the case body of the transfer case, wherein the tail of the transfer case output shaft 6 is supported on the rear cover 4 of the transfer case through a bearing 25, The middle part of the transfer case output shaft 6 is supported on the transfer case front cover 3 through the bearing 26, and the bearing 26 is located in the hollow cone of the transfer case front cover 3, and the front end of the transfer case output shaft 6 protrudes from the transfer case The hollow truncated cone of the front cover 3 can be connected with the front transmission shaft 27, and the pinion 8 is installed through the bearing 7 at the rear of the transfer case output shaft 6. Described bull gear 9 is the monolithic structure that shaft and gear are made into one, and the axle of this bull gear 9 is respectively supported in the mounting hole of front and back cover 3,4 middle parts of transfer case by two bearings 24. The bull gear 9 is located in the middle of the driving gear 2 and the pinion 8, and the centers of the bull gear 9, the driving gear 2 and the pinion 8 are on a straight line, wherein the bull gear 9 is the largest and is connected to the driving gear 2 and the pinion. 8 are meshed one by one, and the size of driving gear 2 and pinion 8 are equal and the direction of rotation is the same.

It can also be seen from Fig. 1 and Fig. 2 that an annular boss 8a is integrally formed on the front part of the pinion 8, and the synchronizer engaging tooth 10 is set on the annular boss 8a, between the synchronizer engaging tooth 10 and the annular boss 8a Through the spline connection, it is limited by the retaining ring 5. The synchronizer engaging tooth 10 is divided into front and rear two sections, and an external spline is arranged on the outer circumference of the rear section of the synchronizer engaging tooth 10, and the front section of the synchronizer engaging tooth 10 is a hollow cone, and the hollow cone is movable Set the synchronous ring 11, the inner hole of the synchronous ring 11 is a tapered hole, the taper of the inner wall of the tapered hole is adapted to the taper of the hollow cone on the synchronizer engagement tooth 10, and the outer contour of the synchronous ring 11 is a step with a small front and a large rear Shape, also be provided with external spline on the outer circumference of the largest diameter section of synchronous ring 11 rear end. A synchronizer fixed tooth 12 is installed on the transfer case output shaft 6 on the front side of the synchronizer ring 11, and the synchronizer fixed tooth 12 is connected with the transfer case output shaft 6 by a spline, and is connected by a bearing 26 and a retaining ring. 5 limit. External splines are also arranged on the outer circumference of the synchronizer fixed teeth 12 , and the external splines of the synchronizer fixed teeth 12 , the synchronizer ring 11 and the synchronizer engaging teeth 10 have the same shape and size. A synchronizer engaging tooth sleeve 13 is set on the synchronizer fixed tooth 12, and the synchronizer engaging tooth sleeve 13 is connected with the synchronizer fixed tooth 12 through a sliding key 28. The hole wall of the central hole of the synchronizer engaging tooth sleeve 13 is provided with an inner Splines, and an annular groove connected with the shift fork mechanism is opened on the outer surface of the synchronizer engaging tooth sleeve 13. Under the toggle of the shift fork mechanism, the synchronizer engaging tooth sleeve 13 can slide towards the synchronizer engaging tooth 10, The synchronizer engaging tooth 10 and the synchronizer fixed tooth 12 are engaged together through the synchronizer engaging tooth sleeve 13 .

It can be further seen from Fig. 1, Fig. 2 and Fig. 3 that the shift fork mechanism is composed of roller 14, shift fork 15, shift fork shaft 16, shift fork shaft output plate 17 and joint 18, wherein shift fork 15, synchronizer fixed teeth 12 and the synchronizer engaging gear sleeve 13 are located in the hollow cone of the transfer case front cover 3, and two rollers 14 are symmetrically installed at both ends of the shift fork 15, and the rollers 14 snap into the synchronizer engaging teeth In the annular groove on the outer surface of cover 13. The shank of shift fork 15 is sleeved on the lower end of shift fork shaft 16, is fixed by bolt. The bottom end of the shift fork shaft 16 extends into the corresponding mounting hole on the front cover 3 of the transfer case, and the upper end of the shift fork shaft 16 passes through the front cover 3 of the transfer case upwards, and is fixed with one end of the output plate 17 of the shift fork shaft , the shift fork shaft output plate 17 is perpendicular to the shift fork shaft 16, and a joint 18 is installed at the other end of the shift fork shaft output plate 17, and the joint 18 can be manipulated with the transfer case in the cab through a flexible shaft (not shown in the figure) Handle connection.

It can also be known from Fig. 3 that a through hole is provided at the bottom end of the transfer case front cover 3, and a spring 19 and a positioning pin 20 are pierced in the through hole, and the outer end of the through hole is sealed by a threaded cover 21; One end of the pin 20 extends into the groove provided on the fork end surface of the shift fork 15 , the other end of the positioning pin 20 abuts against one end of the spring 19 , and the other end of the spring 19 is limited by the threaded cover 21 . The spring 19 is in a state of constant compression. Under the action of the spring 19, the positioning pin 20 bears against the shift fork 15 to prevent it from shaking, thereby ensuring the stability and reliability of the movement of the shift fork 15 to move the synchronizer to engage the tooth sleeve 13.

In the present invention, when the gearbox output shaft 1 rotates under the driving of the engine power, the gearbox output shaft 1 transmits the power of the engine to the rear axle through the rear drive shaft 23 to drive the rear wheels to rotate; meanwhile, the gearbox output shaft 1 The driving gear 2 rotates together with the transmission output shaft 1, and the driving gear 2 drives the pinion 8 to rotate through the bull gear 9. During the state, the synchronizer engaging gear 10 is idling, and the output shaft 6 of the transfer case does not rotate. At this time, the miniature car adopts two rear-wheel drive, which is suitable for driving on a road with better road conditions. When the control handle of the transfer case is connected so that the joint 18 is pulled through the flexible shaft, the shift fork shaft 16 rotates around its axis under the action of the soft shaft, and the shift fork shaft 16 drives the synchronizer through the roller 14 on the shift fork 15 The engaging tooth sleeve 13 slides in the direction of the synchronizer engaging tooth 10, and the synchronizer engaging tooth sleeve 13 pushes the synchronizing ring 11, causing friction between the synchronizing ring 11 and the synchronizing engaging tooth 10, and the synchronizing ring is driven by the friction force. 11 also starts to rotate. When the speed of the synchronous ring 11 is consistent with the speed of the synchronizer tooth 10, the rear end of the synchronizer tooth sleeve 13 slides onto the synchronizer tooth 10, so that the synchronizer tooth sleeve 13 is simultaneously with the The synchronizer engaging teeth 10 and the synchronizer fixed teeth 12 are splined, the synchronizer engaging teeth 10 drive the synchronizer fixed teeth 12 to rotate through the synchronizer engaging gear sleeve 13, and the synchronizer fixed teeth 12 drive the output of the transfer case through the sliding key 28 The shaft 6 rotates, so that the output shaft 6 of the transfer case transmits a part of the power of the engine to the front axle through the front transmission shaft 27, so as to drive the front wheels to rotate. The climbing ability of the miniature car effectively improves the passability of the car.

Claims (8)

1. A miniature automobile transfer case, comprising a drive gear (2) assembled on the transmission output shaft (1), characterized in that: the drive gear (2) is located at the front and rear covers (3, 4) In the box body formed by docking, a large gear (9) and a transfer case output shaft (6) are also supported between the transfer case front and rear covers (3, 4), wherein the transfer case output shaft (6 ) is installed with a pinion (8) through a bearing (7), and the front end of the transfer case output shaft (6) protrudes from the front of the transfer case front cover (3); In the middle of the gear (2) and the pinion (8), the bull gear (9) is the largest and meshes with the driving gear (2) and the pinion (8) respectively; the annular boss ( 8a) A synchronizer engaging tooth (10) is set on the upper sleeve, and the synchronizing ring (11) is looped on the hollow cone at the front end of the synchronizing engaging tooth (10), and the output shaft of the transfer case on the front side of the synchronizing ring (11) ( 6) A synchronizer fixed tooth (12) is installed on it, and outer circumferences of the synchronizer fixed tooth (12), the synchronizer ring (11) and the synchronizer engaging tooth (10) are provided with outer rings of the same shape and size. Splines, and set the synchronizer engaging gear sleeve (13) on the synchronizer fixed tooth (12), the outer surface of the synchronizer engaging gear sleeve (13) has an annular groove, and the roller (14) of a shift fork mechanism Snap into the annular groove, and the fork shaft (16) of the fork mechanism passes upwards out of the transfer case front cover (3). 2. A transfer case for a miniature car according to claim 1, characterized in that: the fork mechanism is composed of a roller (14), a shift fork (15), a shift fork shaft (16), and a shift fork shaft output Plate (17) and joint (18), wherein the shift fork (15) is located in the front cover of the transfer case (3), and rollers (14) are symmetrically installed at both ends of the fork of the shift fork (15). The shank of the fork (15) is fixedly connected with the lower end of the shift fork shaft (16), and the upper end of the shift fork shaft (16) passes upwards outside the transfer case front cover (3), and is connected with the shift fork shaft output plate (17 ) is fixed, and a joint (18) is installed at the other end of the shift fork shaft output plate (17). 3. A transfer case for a miniature car according to claim 2, characterized in that: the handle of the shift fork (15) is set on the shift fork shaft (16), and the two are fixed by bolts. 4. A miniature automobile transfer case according to claim 2, characterized in that: a through hole is opened at the bottom of the transfer case front cover (3), and a spring (19) is inserted in the through hole and positioning pin (20), and the outer end of the through hole is sealed by a threaded cover (21); one end of the positioning pin (20) extends into the groove provided on the fork end face of the shift fork (15), and the positioning pin ( The other end of 20) abuts against one end of spring (19), and the other end of spring (19) is limited by threaded cover (21). 5. A miniature automobile transfer case according to claim 1, characterized in that: the transmission output shaft (1) is supported on the rear cover (4) of the transfer case through bearings, and the transmission output shaft ( 1) protrudes from the transfer case front cover (3), and the rear end of the transmission output shaft (1) protrudes from the hollow cone at the rear of the transfer case rear cover (4). 6. A transfer case for a miniature car according to claim 2, characterized in that: a hollow frustum is integrally formed on the front part of the transfer case front cover (3), and the synchronizer fixed teeth (12 ), the synchronizer gear sleeve (13) and the shift fork (15) are all located in the hollow cone of the transfer case front cover (3), and the front end of the transfer case output shaft (6) is connected from the transfer case front cover The hollow frustum of (3) stretches out. 7. A miniature automobile transfer case according to claim 1, characterized in that: said synchronizer engaging teeth (10) are connected to the annular boss (8a) of the pinion (8) by splines, The synchronizer tooth (10) is divided into front and rear sections, and an external spline is arranged on the outer circumference of the rear section of the synchronizer tooth (10). The front section of the synchronizer tooth (10) is a hollow truncated cone, and the hollow The taper of the truncated cone adapts to the taper of the synchronous ring (11) center hole. 8. A miniature automobile transfer case according to claim 1, characterized in that: the centers of the driving gear (2), the bull gear (9) and the pinion (8) are on a straight line, and Driving gear (2) and pinion (8) are equal in size and direction of rotation.

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