Transmission system and engineering machine

Abstract

The application belongs to the technical field of engineering machinery, and particularly relates to a transmission system and engineering machinery. The transmission system comprises a first transmission module and a second transmission module, and the first transmission module and the second transmission module each comprise a motor, a gearbox, a brake mechanism and a final transmission mechanism. The power of the first transmission module is transmitted from the motor to the gearbox, then from the gearbox to the brake shaft, then from the brake shaft to the final transmission mechanism, and finally from the final transmission mechanism to the corresponding wheel edge device. The power of the second transmission module is transmitted from the motor to the gearbox, then from the gearbox to the brake shaft, then from the brake shaft to the final transmission mechanism, and finally from the final transmission mechanism to the corresponding wheel edge device, so as to realize the walking function of the engineering machinery. The power transmission path is short, the transmission efficiency is high, the overall structure is compact, the number of parts is small, the assembly and manufacturing are simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, in particular to a transmission system and engineering machinery. BACKGROUND

[0002] The transmission system of the existing bulldozer only has a small amount of electric drive system for small and medium tonnage, and the transmission system of the large bulldozer with a tonnage of 100 tons is mainly driven by an engine. The transmission route is: engine→torque converter→gearbox→central transmission→steering and braking system→final transmission, etc. The heat energy is converted into mechanical energy by the engine, and finally transmitted to the final transmission through the transmission of torque and speed, etc. The transmission route of the transmission system is long, the transmission efficiency is low, the overall structure of the transmission system is large, the structure of each part is complex, the assembly and manufacturing are difficult, and the overall cost is high. SUMMARY

[0003] The purpose of the present application is to provide a transmission system and engineering machinery, which has a short power transmission path, high transmission efficiency, compact overall structure, fewer parts, simple assembly and manufacturing, and lower cost.

[0004] To achieve this purpose, the present application adopts the following technical solutions:

[0005] The transmission system comprises a first transmission module and a second transmission module, and each of the first transmission module and the second transmission module comprises:

[0006] An electric motor;

[0007] A gearbox comprising an input assembly and a speed change assembly, the input assembly comprising an input gear, a confluence gear and a confluence gear shaft, the electric motor being connected with the input gear, the input gear being engaged with the confluence gear, the confluence gear being fixedly sleeved on the confluence gear shaft, and the confluence gear shaft being connected with the input end of the speed change assembly;

[0008] A brake mechanism comprising a brake shaft and a brake clutch, the brake shaft being connected with the output end of the speed change assembly, and the brake clutch being arranged on the brake shaft;

[0009] A final transmission mechanism, the input end of which is connected with the brake shaft, and the output end of which is used for being connected with a wheel edge device.

[0010] As a preferred technical solution of the transmission system, the confluence gear shaft has a central hole, and the brake shaft penetrates through the central hole.

[0011] As a preferred technical solution of the transmission system, two electric motors and two input gears are included in each of the first transmission module and the second transmission module, the two electric motors are connected with the two input gears one by one, and the two input gears are engaged with the confluence gear.

[0012] As the preferred technical scheme of the transmission system, the variable speed assembly comprises a first planetary gear set, the first planetary gear set comprises a first sun gear, a first planet gear, a first planet carrier and a first ring gear, the first sun gear is connected with the hub gear shaft, and the first planet carrier is fixedly connected with the brake shaft.

[0013] As the preferred technical scheme of the transmission system, the final transmission mechanism comprises a second planetary gear set and a third planetary gear set, the second planetary gear set comprises a second sun gear, a second planet gear, a second planet carrier and a second ring gear, the third planetary gear set comprises a third sun gear, a third planet gear, a third planet carrier and a third ring gear, the second sun gear is connected with the brake shaft, the second planet carrier is connected with the third sun gear, and the third planet carrier is used to be connected with a wheel-side device.

[0014] As the preferred technical scheme of the transmission system, the second ring gear and the third ring gear are connected through a connecting piece, and the connecting piece is fixedly arranged.

[0015] As the preferred technical scheme of the transmission system, the third planet carrier is rotatably connected with the connecting piece through a bearing.

[0016] As the preferred technical scheme of the transmission system, the connecting piece has a recess, and the bearing is located in the recess.

[0017] As the preferred technical scheme of the transmission system, the brake clutch is a normally open clutch.

[0018] The engineering machinery comprises a first wheel-side device, a second wheel-side device and the transmission system of any one of the above schemes, the final transmission mechanism of the first transmission module is connected with the first wheel-side device, and the final transmission mechanism of the second transmission module is connected with the second wheel-side device.

[0019] The beneficial effects of the present application are as follows:

[0020] The transmission system provided by the application comprises a first transmission module and a second transmission module, and the first transmission module and the second transmission module each comprise a motor, a gearbox, a brake mechanism and a final transmission mechanism. The gearbox comprises an input assembly and a transmission assembly. The input assembly comprises an input gear, a confluence gear and a confluence gear shaft. The motor is connected with the input gear. The input gear is engaged with the confluence gear. The confluence gear is fixedly sleeved on the confluence gear shaft. The confluence gear shaft is connected with the input end of the transmission assembly. The brake mechanism comprises a brake shaft and a brake clutch. The brake shaft is connected with the output end of the transmission assembly. The brake clutch is arranged on the brake shaft. The input end of the final transmission mechanism is connected with the brake shaft. The output end of the final transmission mechanism is used for being connected with a corresponding wheel-side device. The power of the first transmission module is transmitted from the motor to the gearbox, then transmitted from the gearbox to the brake shaft, then transmitted from the brake shaft to the final transmission mechanism, and finally transmitted from the final transmission mechanism to the corresponding wheel-side device. The power of the second transmission module is transmitted from the motor to the gearbox, then transmitted from the gearbox to the brake shaft, then transmitted from the brake shaft to the final transmission mechanism, and finally transmitted from the final transmission mechanism to the corresponding wheel-side device. Thus, the walking function of the engineering machinery is realized. The power transmission path is short, the transmission efficiency is high, the overall structure is compact, the number of parts is small, the assembly and manufacturing are simple, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a schematic diagram of the principle of the transmission system provided by the embodiment of the application;

[0022] Figure 2 FIG. 2 is a schematic diagram of the principle of the first transmission module involved in the embodiment of the application.

[0023] In the drawings:

[0024] 1, first transmission module; 2, second transmission module;

[0025] 10, motor; 21, input assembly; 211, input gear; 212, input shaft; 213, first bearing; 214, confluence gear; 215, confluence gear shaft; 216, second bearing; 22, transmission assembly; 221, first sun gear; 222, first planet gear; 223, first planet carrier; 224, first ring gear; 30, brake mechanism; 31, brake shaft; 32, third bearing; 33, brake clutch; 40, final transmission mechanism; 411, second sun gear; 412, second planet gear; 413, second planet carrier; 414, second ring gear; 421, third sun gear; 422, third planet gear; 423, third planet carrier; 424, third ring gear; 43, connecting piece; 431, recess; 44, fourth bearing. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and embodiments. It is to be understood that the specific embodiments described herein are intended to be illustrative only and not limiting of the scope of the application. In addition, it is to be understood that where the description above refers to embodiments, it is not necessary that all of the described embodiments actually be present in order to practice the application. Further, it is to be understood that the description in this summary is intended to highlight aspects of the application and is not intended to be exhaustive.

[0027] In the description of the present application, unless otherwise clearly specified and limited, the terms "connected", "connected with", "fixed", "fixed with" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0029] In the description of the present embodiment, the terms "up", "down", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0030] As Figure 1 and Figure 2As shown, the embodiment of the present application provides a transmission system, comprising a first transmission module 1 and a second transmission module 2, the first transmission module 1 and the second transmission module 2 are the same structure, the first transmission module 1 and the second transmission module 2 both comprise a motor 10, a gearbox, a brake mechanism 30 and a final transmission mechanism 40, wherein the gearbox comprises an input assembly 21 and a gear shifting assembly 22, the input assembly 21 comprises an input gear 211, a confluence gear 214 and a confluence gear shaft 215, the motor 10 is connected with the input gear 211 through an input shaft 212, the input shaft 212 is supported to rotate by a first bearing 213, the input gear 211 is engaged with the confluence gear 214, the confluence gear 214 is fixedly sleeved on the confluence gear shaft 215, the confluence gear shaft 215 is supported to rotate by a second bearing 216, and the confluence gear shaft 215 is connected with an input end of the gear shifting assembly 22; the brake mechanism 30 comprises a brake shaft 31 and a brake clutch 33, the brake shaft 31 is supported to rotate by a third bearing 32, the brake shaft 31 is connected with an output end of the gear shifting assembly 22, and the brake clutch 33 is arranged on the brake shaft 31; an input end of the final transmission mechanism 40 is connected with the brake shaft 31, and an output end of the final transmission mechanism 40 is used to be connected with a corresponding wheel edge device.

[0031] The power of the first transmission module 1 is transmitted from the motor 10 to the gearbox, then transmitted from the gearbox to the brake shaft 31, then transmitted from the brake shaft 31 to the final transmission mechanism 40, and finally transmitted from the final transmission mechanism 40 to the corresponding wheel edge device, the power of the second transmission module 2 is transmitted from the motor 10 to the gearbox, then transmitted from the gearbox to the brake shaft 31, then transmitted from the brake shaft 31 to the final transmission mechanism 40, and finally transmitted from the final transmission mechanism 40 to the corresponding wheel edge device, so as to realize the walking function of the engineering machinery, the power transmission path is short, the transmission efficiency is high, the overall structure is compact, the number of parts is small, the assembly and manufacturing are simple, and the cost is low.

[0032] In the embodiment, the brake clutch 33 is a normally open clutch. When the engineering machinery needs to turn to the first direction, the brake clutch 33 of the first transmission module 1 is closed, the brake shaft 31 of the first transmission module 1 is fixed by the brake clutch 33, the power of the gearbox of the first transmission module 1 cannot be transmitted to the final transmission mechanism 40 through the brake shaft 31, the brake clutch 33 of the second transmission module 2 remains open, and the power of the second transmission module 2 can be normally transmitted to the final transmission mechanism 40, so as to realize the turning of the engineering machinery to the first direction. When the engineering machinery needs to turn to the second direction, the brake clutch 33 of the second transmission module 2 is closed, the brake shaft 31 of the second transmission module 2 is fixed by the brake clutch 33, the power of the gearbox of the second transmission module 2 cannot be transmitted to the final transmission mechanism 40 through the brake shaft 31, the brake clutch 33 of the first transmission module 1 remains open, and the power of the first transmission module 1 can be normally transmitted to the final transmission mechanism 40, so as to realize the turning of the engineering machinery to the second direction. When the engineering machinery needs to brake, the brake clutch 33 of the first transmission module 1 and the brake clutch 33 of the second transmission module 2 are both closed.

[0033] In the embodiment, the confluence gear shaft 215 has a center hole, and the brake shaft 31 penetrates the center hole, so that the overall structure is more compact.

[0034] In the embodiment, the first transmission module 1 and the second transmission module 2 each include two motors 10 and two input gears 211, the two motors 10 are connected to the two input gears 211 one by one, and the two input gears 211 are each engaged with the confluence gear 214. Each transmission module provides power through two motors 10, which can meet the power demand of a hundred-ton super large bulldozer and other engineering machinery, and can also realize the function of replacing a large-power motor 10 with multiple small-power motors 10, thereby solving the problems of difficult selection, large development technical difficulty, high cost, low power density utilization rate, and large assembly space demand of the large-power motor 10.

[0035] In the embodiment, the transmission assembly 22 includes a first planetary gear set, the first planetary gear set includes a first sun gear 221, a first planet gear 222, a first planet carrier 223, and a first ring gear 224, the first sun gear 221 is an input end of the first planetary gear set, the first sun gear 221 is connected with the confluence gear shaft 215, the first planet carrier 223 is an output end of the first planetary gear set, the first planet carrier 223 is fixedly connected with the brake shaft 31, and the first ring gear 224 is fixedly arranged. In other embodiments, the transmission assembly 22 can also include two or more planetary gear sets connected in series, or can also be a gear pair and at least one planetary gear set connected in series.

[0036] In the embodiment, the final transmission mechanism 40 includes a second planetary gear set and a third planetary gear set, the second planetary gear set includes a second sun gear 411, a second planetary gear 412, a second planetary carrier 413 and a second ring gear 414, the third planetary gear set includes a third sun gear 421, a third planetary gear 422, a third planetary carrier 423 and a third ring gear 424, the second sun gear 411 is an input end of the final transmission mechanism 40, the second sun gear 411 is connected with the brake shaft 31, the second planetary carrier 413 is connected with the third sun gear 421, the third planetary carrier 423 is an output end of the final transmission mechanism 40, the third planetary carrier 423 is used to be connected with the wheel rim device, and the second ring gear 414 and the third ring gear 424 are both fixed. The final transmission mechanism 40 is designed as a two-stage planetary gear reduction structure, so as to realize the function of speed reduction and torque increase, and the two-stage planetary gear reduction structure has the advantages of large speed reduction transmission ratio, large output torque and wide speed reduction range. In other embodiments, the final transmission mechanism 40 can also include one planetary gear set, or three or more planetary gear sets connected in series.

[0037] In the embodiment, the second ring gear 414 and the third ring gear 424 are connected through the connecting piece 43, and the connecting piece 43 is fixedly arranged, that is, the second ring gear 414 and the third ring gear 424 are first connected into an integrated whole through the connecting piece 43, and then the connecting piece 43 is fixed to simultaneously fix the second ring gear 414 and the third ring gear 424, so that the fixing method of the second ring gear 414 and the third ring gear 424 is simplified. Further, the third planetary carrier 423 is rotationally connected with the connecting piece 43 through the fourth bearing 44, so as to improve the stability of the rotation of the planetary carrier. Further, the connecting piece 43 has a recessed portion 431, and the second bearing 216 is located in the recessed portion 431, so as to improve the overall compactness.

[0038] The final transmission mechanism 40 can adopt a high-position driving installation driving mode, so as to ensure the ground clearance of the motor 10, improve the reliability of the motor 10, improve the passability of the whole machine, reduce the probability that the final transmission mechanism 40 is impacted by external objects, and improve the reliability of the final transmission mechanism 40.

[0039] The specific power transmission path of the first transmission module 1 and the second transmission module 2 provided in the embodiment of the application is: the motor 10-input gear 211-converging gear 214-converging gear shaft 215-first sun gear 221-first planetary gear 222-first planetary carrier 223-brake shaft 31-second sun gear 411-second planetary gear 412-second planetary carrier 413-third sun gear 421-third planetary gear 422-third planetary carrier 423-wheel rim device.

[0040] The embodiment of the present application also provides an engineering machine, comprising the first wheel-side device, the second wheel-side device and the transmission system, the terminal transmission mechanism 40 of the first transmission module 1 is connected with the first wheel-side device, and the terminal transmission mechanism 40 of the second transmission module 2 is connected with the second wheel-side device. By using the transmission system, the power transmission path can be shortened, and the transmission efficiency is improved. In the embodiment, the engineering machine is a bulldozer. In other embodiments, the engineering machine can also be a loader or a dump truck.

[0041] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A transmission system characterised in that, The transmission module comprises a first transmission module (1) and a second transmission module (2), the first transmission module (1) and the second transmission module (2) each comprise: a motor (10); a gearbox comprising an input assembly (21) and a transmission assembly (22), the input assembly (21) comprises an input gear (211), a confluence gear (214) and a confluence gear shaft (215), the motor (10) is connected with the input gear (211), the input gear (211) is engaged with the confluence gear (214), the confluence gear (214) is fixedly sleeved on the confluence gear shaft (215), and the confluence gear shaft (215) is connected with an input end of the transmission assembly (22); a brake mechanism (30) comprising a brake shaft (31) and a brake clutch (33), the brake shaft (31) is connected with an output end of the transmission assembly (22), and the brake clutch (33) is arranged on the brake shaft (31); a final transmission mechanism (40) having an input end connected with the brake shaft (31) and an output end used for being connected with a wheel-side device; the transmission assembly (22) comprises a first planetary gear set, the first planetary gear set comprises a first sun gear (221), a first planetary gear (222), a first planetary carrier (223) and a first ring gear (224), the first sun gear (221) is connected with the confluence gear shaft (215), and the first planetary carrier (223) is fixedly connected with the brake shaft (31); the final transmission mechanism (40) comprises a second planetary gear set and a third planetary gear set, the second planetary gear set comprises a second sun gear (411), a second planetary gear (412), a second planetary carrier (413) and a second ring gear (414), the third planetary gear set comprises a third sun gear (421), a third planetary gear (422), a third planetary carrier (423) and a third ring gear (424), the second sun gear (411) is connected with the brake shaft (31), the second planetary carrier (413) is connected with the third sun gear (421), and the third planetary carrier (423) is used for being connected with the wheel-side device; the second ring gear (414) and the third ring gear (424) are connected through a connecting piece (43), and the connecting piece (43) is fixedly arranged.

2. The transmission system of claim 1, wherein, the confluence gear shaft (215) has a central hole, and the brake shaft (31) penetrates through the central hole.

3. The transmission system of claim 1, wherein, both the first transmission module (1) and the second transmission module (2) comprise two motors (10) and two input gears (211), the two motors (10) are connected with the two input gears (211) in a one-to-one manner, and the two input gears (211) are engaged with the confluence gear (214).

4. The transmission system of claim 1, wherein, the third planetary carrier (423) is rotatably connected with the connecting piece (43) through a bearing.

5. The transmission system of claim 4, wherein, the connecting piece (43) has a recessed portion (431), and the bearing is located in the recessed portion (431).

6. A transmission system according to any one of claims 1 to 5, characterised in that, the brake clutch (33) is a normally open clutch.

7. A working machine, characterised in that The transmission system according to any one of claims 1-6, comprising a first wheel rim device, a second wheel rim device and a first transmission module (1) and a second transmission module (2), the final transmission mechanism (40) of the first transmission module (1) being connected to the first wheel rim device, the final transmission mechanism (40) of the second transmission module (2) being connected to the second wheel rim device.

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