Steering system of tracked vehicle

Abstract

The utility model provides a steering system of a tracked vehicle, and belongs to the technical field of tracked vehicles. The differential mechanism comprises a power main shaft, the differential mechanism comprises a differential frame, a middle wheel is fixed to the outer wall of the differential frame, the middle wheel is in transmission fit with the power main shaft through a gear shifting gear set, a plurality of left planet wheels and right planet wheels are arranged in the differential frame, a planet wheel shaft is arranged in the differential frame, and the middles of the left planet wheels are meshed with a left sun wheel; the middle of the left sun gear extends leftwards and forms a left extending part, a left transmission wheel is coaxially fixed to the left extending part, and a left brake set is fixed to the end of the left transmission wheel. A right sun gear is meshed with the middles of the multiple right planet gears, the middle of the right sun gear extends rightwards and forms a right extending part, a right transmission wheel is coaxially fixed to the right extending part, and a right brake set is fixed to the end of the right transmission wheel; the left transmission wheel and the right transmission wheel are in transmission connection with the left output shaft and the right output shaft through reduction gear sets respectively. The utility model has the advantages of reduced differential power influence and high steering efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of tracked vehicles, in particular to a steering system of a tracked vehicle. Background Art

[0002] In paddy field operations, crawler agricultural machinery is usually used, and most transport vehicles use single-sided tooth-split brake steering.

[0003] In the steering process of existing crawler agricultural machinery, the power input causes the two sets of planetary gears to generate differentials to output different speeds to the crawlers on the left and right sides to achieve steering. However, during the steering process, the crawler on the slower side still has a certain amount of power distribution, resulting in a slower steering speed and lower efficiency on the side that needs to be steered under the same power. Summary of the invention

[0004] The utility model aims to provide a steering system for a tracked vehicle, which, after one side is braked and locked, relies on a novel planetary gear mechanism to operate on the other side, fully utilizes the power of a power source, does not need to increase pressure input, efficiently realizes switching, and greatly reduces energy consumption.

[0005] The purpose of the utility model is achieved in this way:

[0006] A steering system for a tracked vehicle includes a power main shaft with one end driven by a power source.

[0007] The differential mechanism includes a differential frame with an intermediate wheel fixed on the outer wall. The intermediate wheel is matched with the power main shaft through the shift gear set. A plurality of left planetary wheels and right planetary wheels meshing with each other are arranged in the differential frame, and a planetary wheel shaft for the left planetary wheels and the right planetary wheels to penetrate and rotate is arranged in the differential frame.

[0008] The middle parts of the plurality of left planetary gears are meshed with a left sun gear, the middle part of the left sun gear extends to the left and forms a left extension part, a left transmission wheel is coaxially fixed on the left extension part, and a left brake group is fixed on the end of the left extension part; the middle parts of the plurality of right planetary gears are meshed with a right sun gear, the middle part of the right sun gear extends to the right and forms a right extension part, a right transmission wheel is coaxially fixed on the right extension part, and a right brake group is fixed on the end of the right extension part;

[0009] The left transmission wheel and the right transmission wheel are respectively connected to the left output shaft and the right output shaft through a reduction gear set.

[0010] The utility model is further configured that the left brake group and the right brake group have the same symmetrical structure, the left brake group includes a brake disc fixed to the end of the left extension portion, and a brake caliper for locking the brake disc is provided on one side of the brake disc.

[0011] The utility model is further configured such that the reduction gear set includes a reduction intermediate shaft, on which a reduction tooth 1 is rotatably sleeved, a reduction tooth 2 meshing with the left transmission wheel is extended from one side of the reduction tooth 1, and a left output wheel meshing with the reduction tooth 1 is coaxially fixed to the end of the left output shaft.

[0012] The utility model is further configured as follows: the shift gear set includes a shift fork shaft, a gear shaft and a transmission shaft, one end of the gear shaft is meshed with the power main shaft for rotational transmission, two groups of gear teeth are coaxially fixed on the gear shaft, a shift fork is slidably provided on the shift fork shaft and located between the two groups of gear teeth, and the transmission shaft is provided with driven teeth meshed with the two groups of gear teeth respectively.

[0013] The utility model is further configured that the power source comprises a hydrostatic motor, an input end of which is driven by a pulley.

[0014] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0015] The steering system of the crawler vehicle provided by the utility model locks the sun gear on the corresponding side through the braking of the left brake group or the right brake group, so that the output brought by the power source drives the output of the sun gear on the other side through the intermediate wheel, and the output shaft on the other side outputs higher power, thereby realizing efficient steering and reducing power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the shift gear set of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the reduction gear set of the utility model;

[0020] Figure 5 It is a partial structural schematic diagram of the differential mechanism of the utility model;

[0021] Reference numerals:

[0022] 1-power source; 10-hydrostatic motor; 11-pulley; 2-power spindle;

[0023] 3-differential mechanism; 30-intermediate wheel; 31-differential frame; 32-left planetary wheel; 33-right planetary wheel; 34-planetary wheel shaft; 35-left sun wheel; 350-left extension; 351-left transmission wheel; 352-left brake group; 353-brake disc; 354-brake caliper; 36-right sun wheel; 360-right extension; 361-right transmission wheel; 362-right brake group;

[0024] 4-shift gear set; 40-shift fork shaft; 41-shift shaft; 410-shift gear; 42-transmission shaft; 420-driven gear;

[0025] 5-reduction gear set; 50-reduction intermediate shaft; 51-reduction gear 1; 52-reduction gear 2

[0026] 6-left output shaft; 60-left output wheel; 7-right output shaft. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings. Figure 1 — Figure 5 :

[0028] A steering system for a tracked vehicle comprises a power main shaft 2 with one end driven by a power source 1.

[0029] The differential mechanism 3 includes a differential frame 31 with an intermediate wheel 30 fixed on the outer wall. The intermediate wheel 30 is in transmission cooperation with the power main shaft 2 through the shift gear set 4. A plurality of left planetary wheels 32 and right planetary wheels 33 meshing with each other are arranged in the differential frame 31, and a planetary wheel shaft 34 for the left planetary wheels 32 and the right planetary wheels 33 to penetrate and rotate is arranged in the differential frame 31.

[0030] A left sun gear 35 is meshed in the middle of a plurality of left planetary gears 32. The middle of the left sun gear 35 extends to the left to form a left extension portion 350. A left transmission wheel 351 is coaxially fixed to the left extension portion 350, and a left brake group 352 is fixed to the end of the left extension portion 350. A right sun gear 36 is meshed in the middle of a plurality of right planetary gears 33. The middle of the right sun gear 36 extends to the right to form a right extension portion 360. A right transmission wheel 361 is coaxially fixed to the right extension portion 360, and a right brake group 362 is fixed to the end of the right extension portion 360.

[0031] The left transmission wheel 351 and the right transmission wheel 361 are respectively connected to the left output shaft 6 and the right output shaft 7 through the reduction gear set 5.

[0032] The normal straight line movement process is:

[0033] The power source drives the power main shaft, and the power main shaft drives the differential frame in the differential mechanism to rotate through the shift gear set 4, and the differential frame drives the left and right planetary wheels to rotate. The rotating left and right planetary wheels drive the left sun gear and the right sun gear to rotate, and the transmission wheels on the two sun gears respectively drive the left output shaft and the right output shaft to rotate through the reduction gear set to realize linear transmission.

[0034] The process of turning is:

[0035] The following is the process of turning right. Figure 5 As shown, braking the left brake group 352 drives the left sun gear to stop rotating. Since the left planetary gear can rotate on the planetary gear shaft, even if the left sun gear is locked and fixed, several left planetary gears can still mesh and rotate on the sun gear. Similarly, the left sun gear 35 will not affect the rotation of the differential frame 31. At this time, all the power transmitted by the power source is output through the right planetary gear, and all the power is output on the right sun gear, allowing the right output shaft to rotate with high power output, greatly improving the steering efficiency.

[0036] Preferably, the left brake group 352 and the right brake group 362 are symmetrical in structure. The left brake group 352 includes a brake disc 353 fixed to the end of the left extension portion 350, and a brake caliper 354 for locking the brake disc 353 is provided on one side of the brake disc 353.

[0037] In the above embodiment, a structure similar to that of a car brake is adopted, whereby the brake disc is locked by a brake caliper, so that the sun gear on one side is locked and fixed. The brake disc and the extension part on one side of the sun gear can be fixedly connected by a flange. After being locked and fixed, the transmission wheel on the extension part no longer drives the output shaft on this side to rotate.

[0038] Preferably, the reduction gear group 5 includes a reduction intermediate shaft 50, on which a reduction tooth 51 is rotatably sleeved, and one side of the reduction tooth 51 extends a reduction tooth 2 52 that meshes with the left transmission wheel 351, and the end of the left output shaft 6 is coaxially fixed with a left output wheel 60 that meshes with the reduction tooth 51.

[0039] In the above structure, the transmission wheel transmits the power to the reduction gear 1 51 through the reduction gear 2 52, and then the reduction gear 1 drives the output wheel at one end of the output shaft to achieve deceleration. The two intermediate shafts 50 are not coaxial, and there is a spacer between the two shafts for axial stability when the intermediate shafts on both sides rotate.

[0040] Preferably, the shift gear set 4 includes a fork shaft 40, a gear shaft 41 and a transmission shaft 42. One end of the gear shaft 41 is meshed with the power main shaft 2 through gears. Two groups of gear teeth 410 are coaxially fixed on the gear shaft 41. A shift fork is slidably provided on the fork shaft 40 and is located between the two groups of gear teeth 410. The transmission shaft 42 is provided with driven teeth 420 that mesh with the two groups of gear teeth 410 respectively.

[0041] During the gear shifting process, by shifting the position of the shift fork, different driven teeth are engaged with different gear teeth to form different speed requirements.

[0042] Preferably, the power source 1 comprises a hydrostatic motor 10 , an input end of which is driven by means of a pulley 11 .

[0043] In the above structure, the power source 1 is the output end of the hydrostatic motor, and the input end of the hydrostatic motor is provided by a pulley. A gear set meshing with the power main shaft 2 is arranged at the output end of the motor to realize the transmission of the power main shaft.

[0044] Preferably, it also includes a housing, and the left brake group and the right brake group are arranged on both sides of the housing, that is, the left and right extensions extend out of both sides, and the extended parts fix the brake disc. The above-mentioned brake group can be in the form of a drum brake, which also achieves the braking effect of the sun gear. A shift rod is arranged on the fork shaft, which extends out of the box and is used to control the left and right movement of the shift fork.

[0045] Working principle:

[0046] The utility model locks the sun gear on one side so that the power output by the power source can output high power to the sun gear on the other side, thereby reducing the differential loss generated when turning and greatly improving the turning efficiency.

[0047] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steering system for a tracked vehicle, characterized in that: It comprises a power main shaft (2) with one end driven by a power source (1). The differential mechanism (3) comprises a differential frame (31) having an intermediate wheel (30) fixed on its outer wall, the intermediate wheel (30) being in transmission cooperation with the power main shaft (2) through a shift gear set (4), a plurality of left planetary wheels (32) and right planetary wheels (33) meshing with each other are arranged in the differential frame (31), and a planetary wheel shaft (34) for the left planetary wheels (32) and the right planetary wheels (33) to penetrate and rotate is arranged in the differential frame (31), A left sun gear (35) is meshed in the middle of a plurality of left planetary gears (32), the middle of the left sun gear (35) extends to the left and forms a left extension portion (350), a left transmission wheel (351) is coaxially fixed on the left extension portion (350), and a left brake group (352) is fixed at the end of the left extension portion; a right sun gear (36) is meshed in the middle of a plurality of right planetary gears (33), the middle of the right sun gear (36) extends to the right and forms a right extension portion (360), a right transmission wheel (361) is coaxially fixed on the right extension portion (360), and a right brake group (362) is fixed at the end of the right extension portion; The left transmission wheel (351) and the right transmission wheel (361) are respectively connected to the left output shaft (6) and the right output shaft (7) through the reduction gear set (5).

2. A steering system for a tracked vehicle according to claim 1, characterized in that: The left brake group (352) and the right brake group (362) are symmetrical in structure. The left brake group (352) includes a brake disc (353) fixed to the end of the left extension part (350), and a brake caliper (354) for locking the brake disc (353) is provided on one side of the brake disc (353).

3. A steering system for a tracked vehicle according to claim 1, characterized in that: The reduction gear set (5) comprises a reduction intermediate shaft (50), a reduction tooth 1 (51) being rotatably sleeved on the reduction intermediate shaft (50), a reduction tooth 2 (52) meshing with the left transmission wheel (351) extending from one side of the reduction tooth 1 (51), and a left output wheel (60) meshing with the reduction tooth 1 (51) being coaxially fixed to the end of the left output shaft (6).

4. A steering system for a tracked vehicle according to claim 1, characterized in that: The shift gear set (4) comprises a shift fork shaft (40), a gear shaft (41) and a transmission shaft (42); one end of the gear shaft (41) is meshed with the power main shaft (2) for transmission via gears; two groups of gear teeth (410) are coaxially fixed on the gear shaft (41); a shift fork is slidably provided on the shift fork shaft (40) and is located between the two groups of gear teeth (410); and driven teeth (420) meshed with the two groups of gear teeth (410) are provided on the transmission shaft (42).

5. A steering system for a tracked vehicle according to claim 4, characterized in that: The power source (1) comprises a hydrostatic motor (10), the input end of which is driven by means of a pulley (11).

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