Zero-turning gearbox with straight moving mechanism

Abstract

The utility model relates to the field of gearboxes, and discloses a zero-turning gearbox with a straight moving mechanism, which comprises a power input shaft, the power input shaft is rotatably arranged in a gearbox shell, an input driving bevel gear is rotatably arranged in the gearbox shell, the power input shaft and the input driving bevel gear are fixedly inserted, and the power input shaft is fixedly connected with the input driving bevel gear. Two first-shaft bodies are rotationally arranged in the gearbox shell, first-shaft driven bevel gears are fixedly inserted into the first-shaft bodies, and the input driving bevel gear is meshed with the two first-shaft driven bevel gears. When the crawler harvester runs straightly, independent control over left and right walking driving is achieved through the double-HST structure, the two motor shafts are connected together through the straight running clutch, the connection relation is rigid connection, the speeds of the two sides are kept consistent in the running process, and if the crawler harvester needs to turn, the straight running clutch is opened, and the two motors are driven to run. Differential turning and forward and reverse turning are achieved by changing the displacement of the motor, and then zero turning and differential turning are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gearbox, concretely is a zero-turn gearbox with straight mechanism. BACKGROUND

[0002] The gearbox is the core component of the automobile transmission system, responsible for converting the speed and torque from the engine to adapt to different driving conditions. It optimizes the speed and power output of the vehicle by changing the gear ratio, ensuring that the engine operates efficiently at various speeds. The gearbox has various forms, including manual transmission (MT), automatic transmission (AT) and dual clutch transmission (DCT), each type has its unique advantages and application scenarios. Modern gearbox also integrates advanced electronic control system, improves the smoothness of gear shifting and fuel economy.

[0003] In the prior art, to reduce the work intensity of the operator, the caterpillar harvester has high requirements for straight-line walking, which requires the speed of the transmission shaft on both sides of the gearbox to be the same to prevent walking deviation caused by different speeds on both sides. The structure of two motors driving the two sides independently exists the problem of different speeds on both sides caused by the difference in pump and motor displacement and volumetric efficiency, which further leads to different ratios of the output shafts on both sides and causes the machine to deviate. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a zero-turn gearbox with straight mechanism to solve the problem of different speeds on both sides caused by the difference in pump and motor displacement and volumetric efficiency, which further leads to different ratios of the output shafts on both sides and causes the machine to deviate.

[0005] In order to realize the above-mentioned utility model purposes, the utility model adopts the following technical scheme: a zero-turn gearbox with a straight-line mechanism, comprising a power input shaft, the power input shaft is rotationally arranged in the inside of a gearbox shell, an input driving helical gear is rotationally arranged in the inside of the gearbox shell, the power input shaft is fixedly inserted with the input driving helical gear, two one-shaft bodies are rotationally arranged in the inside of the gearbox shell, a one-shaft driven helical gear is fixedly inserted on the one-shaft body, the input driving helical gear and the two one-shaft driven helical gears are mutually engaged, a two-shaft assembly is rotationally arranged in the inside of the gearbox shell, a two-shaft long gear shaft is fixedly inserted on the two-shaft assembly, a three-shaft body is rotationally arranged in the inside of the gearbox shell, three-shaft double gear wheels are fixedly inserted at the two ends of the three-shaft body, the two-shaft long gear shaft is engaged with the three-shaft double gear wheels, a four-shaft body is rotationally arranged in the inside of the gearbox shell, two four-shaft double gear wheels are fixedly inserted on the four-shaft body, shaft sleeve washers are arranged on the four-shaft double gear wheels, a five-shaft body is rotationally arranged in the inside of the gearbox shell, two five-shaft output gears are fixedly inserted on the five-shaft body, the five-shaft output gears and the four-shaft double gear wheels are mutually engaged, a right side output half shaft is rotationally inserted on the gearbox shell, a synchronous output gear is fixedly inserted on the right side output half shaft, the five-shaft output gears and the synchronous output gear are mutually engaged.

[0006] Preferably, a plurality of three-shaft thrust washers are fixedly sleeved on the three-shaft body, wherein two three-shaft thrust washers form a group, each group of three-shaft thrust washers corresponds to a three-shaft double gear wheel, two three-shaft needle bearing stop washers are arranged on the three-shaft body, and the two three-shaft needle bearing stop washers are arranged at the two ends of the two three-shaft double gear wheels away from each other.

[0007] Preferably, a steering sleeve is arranged on one side of the gearbox shell, a steering spring is wound on the four-shaft body, a steering shaft spring stop washer is arranged in the inside of the steering sleeve, and the two ends of the steering spring are fixed to the two sides of the steering shaft spring stop washer.

[0008] Preferably, according to the zero-turn gearbox with the straight-line mechanism, characterized in that a support is detachably arranged on one side of the gearbox shell, two fixed bolts are rotationally inserted on the support, and one end of the fixed bolt penetrates through the support and is threadedly connected with one side of the gearbox shell.

[0009] Preferably, a copper bushing is sleeved on the four-shaft body, a steering gear spacer ring is arranged between the two four-shaft double gear wheels, and the inner wall surface of the steering gear spacer ring and the surface of the copper bushing are fixedly inserted.

[0010] Preferably, a gap copper sleeve is sleeved on the five-shaft body.

[0011] Compared with the prior art, the zero-turn gearbox with a straight-line mechanism has the following beneficial effects:

[0012] I. When the power input shaft rotates, it will input initial power to the gearbox. The rotating power input shaft will drive the input driving helical gear to rotate synchronously. Since the input driving helical gear and the one-axis driven helical gear are meshed with each other, the one-axis body will rotate synchronously. When the two-axis assembly rotates, it will drive the two-axis long gear shaft to rotate synchronously. The rotating two-axis long gear shaft will drive the three-axis body to rotate synchronously through the meshing with the three-axis double gear at one end of the three-axis body. At the same time, the three-axis double gear at the other end of the three-axis body will drive the four-axis body to rotate through the meshing with the four-axis double gear on the four-axis body. The rotating four-axis double gear will drive the five-axis body to rotate synchronously through the meshing with the inner core of the five-axis output gear. Finally, the rotating five-axis body will drive the right output half shaft to rotate through the meshing of the five-axis output gear and the synchronous output gear, so that the initial power can be output after changing the rotating speed. Since the left and right brake clutches are cancelled inside the gearbox housing, the failure problem of the clutches is solved. Since the enforcement mechanism is not required, the steering valve and the steering oil cylinder can be cancelled, thereby saving 4KW of energy during steering. When the track harvester is straight, independent control of left and right walking driving is achieved through the double HST structure, and the two motor shafts are connected together through the straight-line clutch, and the connection relationship is rigid connection, so that the speed of both sides remains consistent during driving. If the track harvester needs to turn, the straight-line clutch is opened, differential turning and positive and reverse turning are achieved by changing the motor displacement, and zero-turn and differential turning are achieved.

[0013] II. Since the gear shifting mechanism is cancelled, the powerful driving capability meets the demand of all working conditions, and the driving capability and turning performance are significantly improved. The steering spring can absorb the impact caused by uneven road surface or the vibration generated during the operation of the harvester, so as to ensure that the four-axis body is not damaged and improve the stability of driving. The steering shaft spring retainer can limit the maximum compression and expansion of the steering spring to prevent permanent deformation or breakage caused by excessive compression of the steering spring. The steering spring and the steering shaft spring retainer work together to not only improve the performance and reliability of the gearbox and the steering system, but also enhance the safety and comfort of driving.

[0014] III. The copper bushing on the four-axis body provides a smooth surface, reducing the friction when the four-axis body directly contacts other mechanical parts, thereby reducing the wear rate and prolonging the service life of the four-axis body. In addition, the gap copper bushing can accurately control the gap size between the five-axis body and its cooperating parts to ensure appropriate fitting tightness and compensate for thermal expansion to improve sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a cross-sectional view of the embodiment.

[0016] Figure 2 Power input shaft sectional view schematic diagram for example.

[0017] Figure 3 Side view schematic diagram for example.

[0018] Figure 4 Principle schematic diagram for example.

[0019] In the figure: 1, power input shaft; 2, gearbox shell; 3, input main driving helical gear; 4, one shaft body; 5, one shaft driven helical gear; 6, two shaft assembly; 7, two shaft long gear shaft; 8, three shaft body; 9, three shaft double gear; 10, three shaft thrust washer; 11, four shaft body; 12, four shaft double gear; 13, shaft sleeve washer; 14, five shaft body; 15, five shaft output gear; 16, right side output half shaft; 17, synchronous output gear; 18, three shaft needle bearing retainer; 19, steering sleeve; 20, copper bushing; 21, steering gear spacer; 22, clearance copper sleeve; 23, steering shaft spring retainer; 24, steering spring; 25, support; 26, fixing bolt. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described in detail below with reference to the drawings.

[0021] As Figures 1-4As shown, a straight-line mechanism zero-turn gearbox, comprising a power input shaft 1, the power input shaft 1 is rotatably arranged in the inside of a gearbox shell 2, the inside of the gearbox shell 2 is rotatably arranged with an input driving helical gear 3, the power input shaft 1 is fixedly inserted with the input driving helical gear 3, the inside of the gearbox shell 2 is rotatably arranged with two one-axis bodies 4, the one-axis body 4 is a driven shaft, used to receive power from the gearbox and transmit it to the main reducer or directly connected to the wheel, the one-axis body 4 is fixedly inserted with a one-axis driven helical gear 5, the input driving helical gear 3 and the two one-axis driven helical gears 5 are meshed with each other, the inside of the gearbox shell 2 is rotatably arranged with a two-axis assembly 6, the two-axis assembly 6 is fixedly inserted with a two-axis long gear shaft 7, the inside of the gearbox shell 2 is rotatably arranged with a three-axis body 8, the three-axis body 8 is an intermediate shaft, used to transmit power between different gear sets, both ends of the three-axis body 8 are fixedly inserted with a three-axis double gear 9, the two-axis long gear shaft 7 is meshed with the three-axis double gear 9, the inside of the gearbox shell 2 is rotatably arranged with a four-axis body 11, the four-axis body 11 is a steering shaft, used to control the engagement and separation of the gearbox internal gear, so as to realize different transmission ratio and vehicle speed change, the four-axis body 11 is fixedly inserted with two four-axis double gears 12, the four-axis double gear 12 is provided with a shaft sleeve washer 13, the inside of the gearbox shell 2 is rotatably arranged with a five-axis body 14, the five-axis body 14 is a synchronous output shaft, used to realize smooth gear shifting and power transmission, the five-axis body 14 is fixedly inserted with two five-axis output gears 15, the five-axis output gear 15 is meshed with the four-axis double gear 12, the gearbox shell 2 is rotatably inserted with a right side output half shaft 16, the right side output half shaft 16 is fixedly inserted with a synchronous output gear 17, the five-axis output gear 15 is meshed with the synchronous output gear 17, the three-axis body 8 is fixedly sleeved with a plurality of three-axis thrust washers 10, two three-axis thrust washers 10 form a group, each group of three-axis thrust washers 10 corresponds to the three-axis double gear 9, the three-axis body 8 is provided with two three-axis needle bearing retainer rings 18, the two three-axis needle bearing retainer rings 18 are respectively arranged at the two ends of the two three-axis double gears 9 away from each other.

[0022] In use, the power input shaft 1 rotates to input initial power to the gearbox, the rotating power input shaft 1 drives the input main driven helical gear 3 to rotate synchronously, because the input main driven helical gear 3 and the one-axis driven helical gear 5 are meshed with each other, so the one-axis body 4 is driven to rotate synchronously, when the two-axis assembly 6 rotates, the two-axis long gear shaft 7 is driven to rotate synchronously, the rotating two-axis long gear shaft 7 drives the three-axis body 8 to rotate synchronously by meshing with the three-axis double gear 9 at one end of the three-axis body 8, at the same time, the three-axis double gear 9 at the other end of the three-axis body 8 drives the four-axis body 11 to rotate by meshing with the four-axis double gear 12 on the four-axis body 11, the rotating four-axis double gear 12 drives the five-axis body 14 to rotate synchronously by meshing with the inner core of the five-axis output gear 15, finally, the rotating five-axis body 14 drives the right output half shaft 16 to rotate by meshing with the five-axis output gear 15 and the synchronous output gear 17, that is, the initial power is output after changing the rotating speed, because the left and right brake clutches inside the gearbox housing 2 are cancelled, the clutch failure problem is solved, at the same time, because the enforcement mechanism is not required, the steering valve and the steering oil cylinder can be cancelled, thereby saving 4KW of energy during steering, when the track harvester is straight, the left and right walking driving independent control is realized through the double HST structure, and the two motor shafts are connected together through the straight clutch, and the connection relationship is rigid connection, so that the speed of both sides remains consistent during driving, if the track harvester needs to turn, the straight clutch is opened, differential turning and positive and reverse turning are realized by changing the motor displacement, thereby realizing zero turning and differential turning.

[0023] As shown in Figure 1 The side of the gearbox housing 2 is provided with a steering sleeve 19, the four-axis body 11 is wound with a steering spring 24, the inside of the steering sleeve 19 is provided with a steering shaft spring retainer 23, the two ends of the steering spring 24 are respectively fixed with the two sides of the steering shaft spring retainer 23, the side of the gearbox housing 2 is detachably provided with a support 25, two fixed bolts 26 are rotatably inserted into the support 25, one end of the fixed bolt 26 penetrates through the support 25 and is threadedly connected with the side of the gearbox housing 2.

[0024] In use, because the gear shifting mechanism is cancelled, the powerful driving ability adapts to the full working condition requirement, the driving ability and the turning performance are obviously improved, the steering spring 24 can absorb the impact caused by the uneven road or the vibration generated during the operation of the harvester, so as to ensure that the four-axis body 11 is not damaged and improve the driving stability, the steering shaft spring retainer 23 can limit the maximum compression and expansion degree of the steering spring 24, prevent the steering spring 24 from being permanently deformed or broken due to excessive compression, the steering spring 24 and the steering shaft spring retainer 23 work together, not only improve the performance and reliability of the gearbox and the steering system, but also enhance the safety and comfort of driving.

[0025] AsFigure 1 As shown, the four-axis body 11 is sleeved with a copper bush 20, and the two four-axis double gear 12 is provided with a steering gear spacer 21, the inner wall surface of the steering gear spacer 21 is fixedly inserted with the surface of the copper bush 20, and the five-axis body 14 is sleeved with a gap copper sleeve 22.

[0026] In use, the copper bush 20 on the four-axis body 11 provides a smooth surface, reduces the friction when the four-axis body 11 directly contacts with other mechanical parts, thereby reducing the abrasion speed, prolonging the service life of the four-axis body 11, in addition, the gap copper sleeve 22 can accurately control the gap size between the five-axis body 14 and its cooperating parts, ensure the appropriate fitting tightness, so as to compensate the thermal expansion and improve the sealing performance.

[0027] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art within the technical range disclosed by the present application, according to the technical scheme and the utility model concept of the present application, is equivalent to replace or change, should be covered in the protection scope of the present application.

Claims

1. A zero-turn gearbox with straight-ahead mechanism, comprising a power input shaft (1) which is rotatably arranged inside a gearbox housing (2), characterized in that, The inside of the gearbox shell (2) is rotatably provided with an input driving helical gear (3), the power input shaft (1) is fixedly inserted with the input driving helical gear (3), the inside of the gearbox shell (2) is rotatably provided with two one-axis bodies (4), the one-axis body (4) is fixedly inserted with a one-axis driven helical gear (5), the input driving helical gear (3) is meshed with the two one-axis driven helical gears (5), the inside of the gearbox shell (2) is rotatably provided with a two-axis assembly (6), the two-axis assembly (6) is fixedly inserted with a two-axis long gear shaft (7), the inside of the gearbox shell (2) is rotatably provided with a three-axis body (8), the two ends of the three-axis body (8) are fixedly inserted with a three-axis double gear (9), the two-axis long gear shaft (7) is meshed with the three-axis double gear (9), the inside of the gearbox shell (2) is rotatably provided with a four-axis body (11), the four-axis body (11) is fixedly inserted with two four-axis double gears (12), the four-axis double gear (12) is provided with a shaft sleeve washer (13), the inside of the gearbox shell (2) is rotatably provided with a five-axis body (14), the five-axis body (14) is fixedly inserted with two five-axis output gears (15), the five-axis output gear (15) is meshed with the four-axis double gear (12), the gearbox shell (2) is rotatably inserted with a right side output half shaft (16), the right side output half shaft (16) is fixedly inserted with a synchronous output gear (17), the five-axis output gear (15) is meshed with the synchronous output gear (17).

2. A zero-turn gearbox with straight travel mechanism according to claim 1, characterized in that: A plurality of three-axis thrust washers (10) are fixedly sleeved on the three-axis body (8), two of the three-axis thrust washers (10) form a group, each group of the three-axis thrust washers (10) corresponds to the three-axis double gear (9), the three-axis body (8) is provided with two three-axis needle bearing retaining rings (18), the two three-axis needle bearing retaining rings (18) are respectively arranged at the two ends of the two three-axis double gears (9) away from each other.

3. A zero-turn gearbox with straight travel mechanism according to claim 1, characterized in that: A steering sleeve (19) is arranged on one side of the gearbox shell (2), a steering spring (24) is wound on the four-axis body (11), the inside of the steering sleeve (19) is provided with a steering shaft spring retaining ring (23), the two ends of the steering spring (24) are respectively fixed to the two sides of the steering shaft spring retaining ring (23).

4. A zero-turn gearbox with straight travel mechanism according to claim 1, characterized in that: A support (25) is detachably arranged on one side of the gearbox shell (2), two fixed bolts (26) are rotatably inserted on the support (25), one end of the fixed bolt (26) penetrates through the support (25) and is threadedly connected with one side of the gearbox shell (2).

5. A zero-turn gearbox with straight travel mechanism according to claim 1, characterized in that: A copper bushing (20) is sleeved on the four-axis body (11), a steering gear spacer (21) is arranged between the two four-axis double gears (12), the inner wall surface of the steering gear spacer (21) and the surface of the copper bushing (20) are fixedly inserted.

6. A zero-turn gearbox with straight travel mechanism according to claim 1, characterized in that: A gap copper sleeve (22) is sleeved on the five-axis body (14).

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