CN214984817U - Power assembly for electric wheel type engineering machinery - Google Patents

Abstract

The utility model discloses a power assembly for electronic wheeled engineering machine tool belongs to engineering machine tool especially wheel loader field. Comprises a power assembly box body, a working device power unit and a walking power unit; the power assembly box body comprises a gearbox, a transfer case and a power output case; the transfer case is positioned at the upper part of the gearbox; the power output box is positioned at the lower part of the gearbox; the utility model integrates the drive of the working device, the walking drive, the transfer case, the gearbox, the front output and the rear output, and the like, and can meet the independent drive of the hydraulic pump, the steering pump and the brake pump of the working device; the walking driving motor can also independently drive the loader to walk, has compact structure, convenient maintenance and low cost, ensures that wheel type engineering machinery such as the loader and the like obtains the best working performance, and can obviously improve the working efficiency of the whole machine. The forward and backward switching can be realized by adopting the motor drive and utilizing the reverse rotation of the motor, and the gearbox does not need a reversing mechanism.

Description

Power assembly for electric wheel type engineering machinery

Technical Field

The utility model belongs to electronic wheeled engineering machine tool especially relates to a power assembly for electronic wheeled engineering machine tool.

Background

In recent years, various electric vehicle technologies are gradually mature, reliable and especially economic electric vehicle products are consumed year by year, and the market acceptance is very considerable. With the regulation and control upgrading of environmental protection policies, the national requirements on ecological environment protection are higher and higher, and engineering machinery enterprises also need to actively take the actions of energy conservation and emission reduction to finish the industrial upgrading as soon as possible. In particular, in certain specific working environments such as municipal administration, ports and underground operation, zero emission thresholds are provided for engineering machinery to enter fields by related departments.

Electric vehicles have driven core components and technologies such as motors, batteries, electronic control, rapid charging and discharging, and the like to become mature day by day, and the development and application of electric engineering machinery have been a necessary trend.

The loader is used as a general engineering machine and has wide application fields, such as farmland renovation, engineering construction, factories and mines, ports and the like. At present, the main stream loader in China still adopts the traditional internal combustion engine as power, the transmission modes are hydraulic mechanical transmission and hydraulic transmission, and the loader has the defects of poor fuel economy and high pollution emission.

The loader using electric energy as energy and the motor as power has the advantages of strong load adaptability, convenient operation, energy conservation and environmental protection. The existing electric loader in the market at present mainly has two transmission types, one is to adopt a motor to replace an engine, adopts the existing hydraulic mechanical transmission speed changer, and has the advantages of compact structure, lower cost and low transmission efficiency, and can not effectively utilize electric energy.

The other type is that two motors are adopted, one motor drives a hydraulic pump of a working device, the other motor drives the working device to travel, and the two motors are respectively and independently placed, so that the difficulty is brought to the arrangement and maintenance of the whole machine.

The applicant searches before applying, wherein the utility model discloses an electric loader gearbox assembly related to the application; the device is characterized in that the device has a patent application number of CN202011072473.4, one side of a box body lubricating oil channel is provided with a lubricating oil pipe joint and is blocked by a screw, and the other side of the box body lubricating oil channel is connected with an oil inlet hole of an input shaft end cover; one side of the box gear oil duct is connected with a gear oil pipe joint, and the other side of the box gear oil duct is connected with an oil inlet hole of the control valve; fixing the gearbox assembly on the electric loader through the connecting seat; the external pump pumps the lubricating oil at the bottom of the gearbox to a lubricating and gear oil passage of a lubricating system entering the gearbox through the filter element assembly, so as to lubricate parts inside the gearbox and control gears through the control valve; the right side of the bearing I is provided with an oil passing sleeve, the middle part of the input shaft is provided with a lubricating oil channel, and the lubricating oil channel on the box body, the oil inlet hole of the end cover of the input shaft, the oil passing hole of the oil passing sleeve and the lubricating oil channel of the input shaft are communicated together, so that the lubricating oil can forcibly lubricate a reverse gear planetary row assembly, a first gear planetary row assembly and a triaxial assembly in the gearbox. The utility model provides an among the prior art gearbox assembly for the electric loader keep off the position many, problem with high costs.

The patent application number is CN 202011072473.4's "electronic loader gearbox assembly" has only provided gearbox and front and back axle power take off case, can only arrange a walking and use the motor, does not have the transfer case, can not install and arrange hydraulic pump driving motor to the wheel loader is the example, must increase another hydraulic pump driving motor, is used for driving the equipment hydraulic pump and turns to the hydraulic pump, brings the difficulty for arranging of complete machine. The utility model discloses an overcome it not enough, provided one kind and can install two motors respectively and have power assembly for electronic wheeled engineering machine tool of transfer case, gearbox and power take-off case.

Therefore the utility model relates to a power assembly for electronic wheeled engineering machine tool adapts to electronic wheeled engineering machine tool's installation and arranges and the work demand, directly replaces transmission engine.

SUMMERY OF THE UTILITY MODEL

The problem to prior art exists, the utility model provides a high integration can satisfy the independent drive of equipment hydraulic pump and steering pump, and the walking motor also can independently drive the loader walking, can reach compact structure, maintenance convenience, cost are lower, make the loader obtain best working property to improve the power assembly for electronic wheeled engineering machine tool of work efficiency purpose.

The utility model is realized in such a way that the power assembly for the electric wheel type engineering machinery comprises a power assembly box body and a power unit arranged on the box body; the power unit comprises a working device power unit which is used for providing power input for driving the hydraulic pump to work by the action, the steering and the lubrication of accessories when the electric loader works; the walking power unit is used for providing power input for the running, reversing and accelerating processes of the vehicle; the method is characterized in that:

the power assembly box body comprises a gearbox, a transfer case and a power output case; the transfer case is positioned at the upper part of the gearbox; the power output box is positioned at the lower part of the gearbox; the gearbox, the transfer case and the power output case are in a communicated structure in the case body; the same side of the gearbox and the transfer case is of an open structure, and the open sides of the gearbox and the transfer case are respectively provided with a case cover;

the working device power unit comprises a working device driving motor, the working device driving motor is connected with a working power input shaft arranged in the transfer case, and a working power driving gear is arranged on the working power input shaft; a variable speed pump is coaxially arranged on the working power input shaft at the outer side of the transfer case; the working power driving gear is connected with at least one working driven gear through a gear pair, the working driven gear is installed on a corresponding working driven shaft, and the working driven shaft is installed on the transfer case through a supporting bearing; a hydraulic pump PTO interface is arranged on the transfer case opposite to the driving motor side of the working device and used for mounting a hydraulic pump of the working device, a steering hydraulic pump and a braking hydraulic pump, and a transmission pump PTO interface is arranged below the hydraulic pump PTO;

a walking driving motor mounting interface is arranged on the gearbox on the opposite side of the driving motor of the working device; a parking brake mounting seat for mounting a parking brake is arranged on the gearbox on the same side of the walking driving motor mounting interface;

the walking power unit comprises a walking driving motor arranged on a walking driving motor mounting interface; the walking power input mechanism is connected with the walking driving motor and is arranged on the upper layer of the gearbox; the speed-changing and gear-shifting mechanism is connected with the walking power input mechanism and is arranged on the lower layer of the gearbox; a gear shifting control valve mounting interface is arranged on the opposite side of the walking driving motor corresponding to the position of the speed changing and gear shifting mechanism; a gear shift operating valve is arranged on the gear shift operating valve mounting interface; the power output mechanism is connected with the speed change and gear shift mechanism and is arranged in the power output box; a front axle driving interface is arranged on one side of the power output box, and the front axle driving interface and the walking driving motor are positioned on the same side; the opposite side is equipped with rear axle drive interface, and front axle drive interface passes through the transmission shaft and is connected the front wheel rotation of drive vehicle with the front axle: the rear axle driving interface is connected with a rear axle through a transmission shaft to drive the rear wheels of the vehicle to rotate;

the power output mechanism comprises a walking power output shaft, the walking power output shaft is arranged in the power output box through bearing seats and bearings at two ends, and an output driven gear meshed with an output driving gear of the speed change gear shifting mechanism is arranged on the walking power output shaft; and connecting flanges which are driven by a front axle and a rear axle are arranged at two ends of the power output shaft.

In the above technical solution, preferably, the transfer case and the power take-off case are arranged diagonally or symmetrically or on the same side with respect to the transmission case.

In the above technical solution, preferably, the transfer case on the opposite side of the driving motor of the opposite working device is provided with PTO interfaces for three hydraulic pumps; the upper left hydraulic pump PTO interface and the upper right hydraulic pump PTO interface are used for installing a hydraulic pump and a steering hydraulic pump of a working device, and the lower middle hydraulic pump PTO interface is a transmission pump PTO interface.

In the above technical solution, preferably, the traveling motor mounting interface and the hydraulic pump PTO device interface on the transfer case are located on the same side or different sides.

In the above technical solution, preferably, the traveling power input mechanism is connected to the speed change and shift mechanism by a traveling planetary gear pair; the traveling planetary gear pair comprises a sun gear coaxially arranged on the power input shaft, a gear ring is respectively connected with a high-grade clutch and a low-grade clutch, a planet carrier is connected with a first-level output driving gear, and the first-level output driving gear is connected with the power output mechanism through a first-level output driven gear, an output driving gear and an output driven gear.

In the above technical solution, preferably, the walking power input mechanism is connected to the speed-changing and gear-shifting mechanism by a walking fixed-axis gear pair; the walking fixed-axis gear pair comprises a power input shaft arranged at the upper part in the gearbox, and a high-speed driving gear and a low-speed driving gear are arranged on the power input shaft in the gearbox.

In the above technical solution, preferably, the speed change and shift mechanism employs a speed change planetary gear pair; the speed change planetary gear pair comprises a sun gear coaxially arranged on the power input shaft, a gear ring is respectively connected with a high-grade clutch and a low-grade clutch, a planet carrier is connected with an output driving gear, and the output driving gear is connected with a front axle driving interface and a rear axle driving interface through an output driven gear.

In the above technical solution, preferably, the speed change and gear shift mechanism employs a speed change fixed shaft gear pair; the gear pair comprises a gear shifting shaft which is arranged in the gearbox through a supporting bearing; the gear shifting shaft is provided with a high-speed driven gear and a low-speed driven gear which are mutually meshed with the high-speed driving gear and the low-speed driving gear, and the gear shifting shaft is provided with a high-speed clutch and a low-speed clutch; a gear shifting control valve for controlling the high-gear clutch and the low-gear clutch to realize gear shifting is arranged at the end part of the gear shifting shaft; and an output driving gear connected with the power output mechanism is also arranged on the gear shifting shaft.

In the above technical solution, preferably, the power output shaft is a through shaft.

In the above technical solution, preferably, the power output shaft is a split shaft, and a clutch is connected between the two split shafts.

The utility model has the advantages and technological effect: the utility model discloses a power assembly directly utilizes power battery's electric energy to the motor is power, can satisfy the requirement of loader economic nature, dynamic property and travelling comfort, is the transmission form of an ideal. The electric motor has a wider stepless speed regulation range, good starting characteristic and higher transmission efficiency, and the electric motor and the two-gear power gear shifting transmission are integrated into a power assembly, so that the traction force and the vehicle speed requirements of the engineering machinery can be considered according to the working characteristics of the engineering machinery. The power assembly can integrate a hydraulic pump motor, a traveling motor, a hydraulic pump PTO transfer case, a gearbox, a front output and a rear output and the like of a working device, and directly replace a traditional engine, a torque converter and a hydraulic transmission gearbox under the condition of not changing the structure and the oil circuit of a traditional engineering vehicle; the hydraulic pump and the steering pump of the working device can be independently driven, the traveling motor can also independently drive the engineering machinery to travel, and for the vehicle which needs to frequently advance and retreat during the working of the engineering machinery, the motor is adopted to drive the vehicle to advance and retreat by utilizing the reverse rotation of the motor, so that a reversing mechanism with complex transmission is replaced; the utility model discloses compact structure, maintenance convenience, cost are lower can be reached, engineering machine tool obtains the best working property to improve work efficiency's purpose.

Drawings

FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a top view of FIG. 1;

fig. 5 is a schematic perspective view of the present invention;

FIG. 6 is a schematic perspective view of a power assembly housing;

FIG. 7 is a schematic view of the internal structure of the powertrain housing;

FIG. 8 is a schematic view of the internal overall structure of embodiment 1;

FIG. 9 is a schematic illustration of the symmetrical arrangement of the transfer case and the pto case with respect to the transfer case;

FIG. 10 is a schematic illustration of the same side arrangement of the transfer case and the pto case relative to the transfer case;

FIG. 11 is a schematic structural view of example 2;

FIG. 12 is a schematic structural view of example 3.

In the figure: 100. a power assembly box; 110. a gearbox; 120. a transfer case; 130. a power take-off box; 140. assembling a reference surface; 150. an electric component mounting hole; 160. an oil suction filter interface; 170. an oil filling hole; 180. an oil drain hole; 190. supporting feet; 210. a working device power unit; 211. the working device drives the motor; 212. a working power input shaft; 213. a working power drive gear; 214. a variable speed pump; 215. a working driven gear; 216. a working driven shaft; 217. a hydraulic pump PTO interface; 218. a transmission pump PTO interface; 220. a walking power unit; 221. a walking driving motor mounting interface; 222. a parking brake mount; 223. a travel driving motor; 224. a traveling power input mechanism; 224-1, a power input shaft; 224-2, a planet carrier; 224-3, a gear ring; 224-4, sun gear; 224-5, high gear drive gear; 224-6, low gear drive gear; 225. a speed change and gear shift mechanism; 225-1, a gear shift shaft; 225-2, a high-speed driven gear; 225-3, low-gear driven gear; 225-4, high clutch; 225-5, low range clutch; 225-6, an output drive gear; 225-7, a primary output driving gear; 225-8, a primary output driven gear; 226. an operating valve mounting interface; 227. a shift operating valve; 228. a power take-off mechanism; 228-1, a walking power output shaft; 228-2, an output driven gear; 229. a front axle drive interface; 230. a rear axle drive interface; 300. and a box cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1, please refer to fig. 1 to 8, a power assembly for an electric wheeled engineering machine includes a power assembly box 100 and a power unit installed in the box; the power unit comprises a working device power unit 210 which is used for providing power input for driving the hydraulic pump to work by braking, steering and lubricating accessories when the electric loader works; the walking power unit 220 is used for providing power input for the running, reversing and accelerating processes of the vehicle; the method is characterized in that: the powertrain housing 100 includes a transmission 110, a transfer case 120, and a pto case 130; one group of opposite or adjacent side surfaces of the gearbox is a finished automobile assembly reference surface 140, the finished automobile assembly reference surface is designed and packaged on the mounting precision of the power assembly, meanwhile, the mounting efficiency is improved, and a foundation is laid for quickly replacing an engine; the transfer case 120 is located in the upper part of the gearbox; the pto case 130 is located at a lower portion of the transmission case; the gearbox, the transfer case and the power output case are in a communicated structure in the case body; the same side of the gearbox and the transfer case is of an open structure, and the open sides of the gearbox and the transfer case are respectively provided with a case cover 300; the power assembly box body is actually manufactured, and the power assembly box body also comprises the following structural design that the side surface of the power output box is also provided with an electric element mounting hole 150 for mounting and detecting the rotating speed; the lower part of the power output box is provided with an oil absorption filter interface 160; an oil absorption filter is arranged on the oil absorption filter interface; the power output box is provided with an oil filling hole 170 and an oil drain hole 180; the oil drain hole is arranged at the bottom of the power output box; an oil level observation hole is also formed in the power output box, and limitation can be performed according to the height of the power output box and the oil filling amount; and the bottom of the power output box is provided with a support foot 190.

The working device power unit 210 includes a working device drive motor 211 connected to a working power input shaft 212 mounted in the transfer case, the working power input shaft having a working power drive gear 213 mounted thereon; a variable speed pump 214 is coaxially arranged on the working power input shaft at the outer side of the transfer case; the working power driving gear is connected with at least one working driven gear 215 through a gear pair, the working driven gear is arranged on a corresponding working driven shaft 216, and the working driven shaft is arranged on the transfer case through a support bearing; a hydraulic pump PTO interface 217 is arranged on the transfer case opposite to the driving motor side of the working device, the hydraulic pump PTO interface is used for installing a hydraulic pump of the working device and a steering hydraulic pump, and a transmission pump PTO interface 218 is arranged below the hydraulic pump PTO;

a walking driving motor mounting interface 221 is arranged on the gearbox on the opposite side of the driving motor of the working device; a parking brake mounting seat 222 for mounting a parking brake is arranged on the gearbox on the opposite side of the walking drive motor mounting interface; the parking brake is used for guaranteeing the safety of the vehicle under the parking condition, and the working principle of the parking brake belongs to the known technology and is not described herein again.

The walking power unit 220 comprises a walking driving motor 223 mounted on the walking driving motor mounting interface; the walking driving motor can be connected with the walking driving motor installation interface in a direct connection or indirect connection mode, and direct connection is preferably adopted in the embodiment; a walking power input mechanism 224 connected with the walking driving motor, wherein the walking power input mechanism is arranged on the upper layer of the gearbox; a speed change and gear shift mechanism 225 connected to the walking power input mechanism, the speed change and gear shift mechanism being disposed at a lower layer of the transmission case; a gear shifting control valve mounting interface 226 is arranged on the opposite side of the walking drive motor corresponding to the position of the speed changing and gear shifting mechanism; a gear shift operating valve 227 is arranged on the gear shift operating valve mounting interface; a power take-off mechanism 228 coupled to the derailleur, the power take-off mechanism being disposed within the power take-off housing; a front axle driving interface 229 is arranged on one side of the power output box, and the front axle driving interface and the walking driving motor are positioned on the same side; the other side is equipped with rear axle drive interface 230, and front axle drive interface is connected the front wheel rotation of driving the vehicle through transmission shaft and front axle: the rear axle driving interface is connected with a rear axle through a transmission shaft to drive the rear wheels of the vehicle to rotate;

in this embodiment, the walking power input mechanism 224 is connected to the speed-changing and gear-shifting mechanism by a walking fixed-axis gear pair; the walking fixed-axis gear pair comprises a power input shaft 224-1 arranged at the upper part in the gearbox, and a high-speed driving gear 224-5 and a low-speed driving gear 224-6 are arranged on the power input shaft in the gearbox.

In this embodiment, the speed-changing and gear-shifting mechanism 225 adopts a speed-changing fixed-axis gear pair; the gear shift fixed-axis gear pair comprises a shift shaft 225-1, which is mounted in the gearbox by means of a support bearing; a high-speed driven gear 225-2 and a low-speed driven gear 225-3 which are mutually meshed with the high-speed driving gear 224-5 and the low-speed driving gear 224-6 are arranged on the gear shifting shaft, and a high-speed clutch 225-4 and a low-speed clutch 225-5 are arranged on the gear shifting shaft; a gear shift operating valve 227 used for controlling a high-gear clutch and a low-gear clutch to realize gear shifting is arranged at the end part of the gear shift shaft; the shift shaft is also provided with an output drive gear 225-6 connected to a power take-off 228.

The power output mechanism 228 comprises a walking power output shaft 228-1, the walking power output shaft is arranged in a power output box through bearing seats and bearings at two ends, and an output driven gear 228-2 meshed with an output driving gear of the speed change gear shifting mechanism is arranged on the walking power output shaft; and connecting flanges which are driven by a front axle and a rear axle are arranged at two ends of the power output shaft.

In the above technical solution, preferably, the walking power output shaft can be a through shaft; it is also possible to use split shafts, between which a clutch is connected. The preferred through-shaft design in this embodiment; for the wheel type engineering machinery needing to disconnect the front axle power, a split shaft structure can be adopted.

In the above technical solution, preferably, the transfer case on the opposite side of the driving motor of the opposite working device is provided with PTO interfaces for three hydraulic pumps; the upper left hydraulic pump PTO interface and the upper right hydraulic pump PTO interface are used for installing a hydraulic pump of a working device and a steering hydraulic pump, wherein the steering hydraulic pump can be simultaneously connected with a brake hydraulic pump in series, and the purpose of the steering hydraulic pump is to provide power for service braking of the whole machine; the lower middle hydraulic pump PTO interface is a transmission pump PTO interface; in the embodiment, the centers of the upper left hydraulic pump PTO interface and the upper right hydraulic pump PTO interface are on the same horizontal central line; the transmission pump PTO interface is positioned on a vertical center line between the upper left hydraulic pump PTO interface and the upper right hydraulic pump PTO interface, so that the structure is more compact.

In the above technical solution, preferably, the traveling motor mounting interface and the hydraulic pump PTO device interface on the transfer case are located on the same side or different sides.

Adopt above-mentioned technical scheme, the utility model has the advantages of it is following:

the transfer case is arranged on the upper part for the purposes that: the position of the driving motor of the working device occupies the space position of the torque converter in the hydraulic transmission gearbox in the prior art; its equipment drive motor passes through the gear pair drive equipment hydraulic pump PTO device in the transfer case, the utility model discloses a position of equipment hydraulic pump PTO device is unanimous completely with the position of equipment hydraulic pump PTO device in the hydraulic transmission gearbox among the prior art, need not to do any adjustment to complete machine equipment and a steering system's pipeline arrangement, can realize the purpose of quick replacement.

The gearbox is arranged in the middle part; the gearbox of the utility model can realize high-low gear power gear shifting, the gearbox occupies a larger space position of the power assembly as a whole, and the position of the gearbox is consistent with the position of the existing hydraulic transmission gearbox; because the walking driving motor can realize positive and negative rotation, compared with the existing hydraulic transmission gearbox, the gearbox of the utility model does not need to be provided with a reverse gear mechanism, and only the speed change gear shifting mechanism and the power output mechanism connected with the speed change gear shifting mechanism are arranged in the gearbox, so that the mechanism is simpler and more compact; because a reverse gear mechanism is omitted, the cost is reduced on the basis of ensuring the function; meanwhile, fault risk points are reduced, and reliability is improved; in addition, compared with the traditional hydraulic transmission gearbox, the number of gear pairs is reduced, the transmission efficiency is improved, and the energy loss is reduced.

In the present embodiment, it is preferable that the power take-off case is provided at a lower portion and is disposed diagonally to the transfer case, and is applied to a loader for an existing fuel engine for the purpose of: the power output device can output the power of the gearbox to a front driving axle and a rear driving axle of the vehicle; the space position of the power output device is consistent with that of a power output device in a hydraulic transmission gearbox in the prior art, so that the transmission shaft and a drive axle of the existing vehicle can be quickly replaced without any adjustment or change. The utility model discloses can use on the wheeled engineering machine tool of difference according to actual need, for example wheel loader, wheeled excavator, leveler, wheeled bull-dozer etc, transfer case and power take off case also can set up for the symmetry (refer to and refer to figure 9) or set up for the homonymy (refer to figure 10) for the gearbox.

The walking driving motor and the working device driving motor are relatively arranged, and the walking driving motor and the working device driving motor have the advantages that: compared with the existing articulated frame loader, the articulated frame loader avoids the interference with a rear axle bag; the space above the hinge point of the front frame and the rear frame of the loader is fully utilized; meanwhile, the arrangement is beneficial to mounting, dismounting, maintaining and maintaining of the walking driving motor and the gearbox, and the problem that the existing dual-motor electric loader is difficult to maintain in a transmission mode is solved.

To sum up, the utility model adopts the box body which is integrally arranged; two motors are integrally arranged on the same box body, wherein a working device driving motor respectively drives a working device hydraulic pump and a steering hydraulic pump through a transfer case, and can also drive a brake pump and a variable speed pump; the walking driving motor outputs power to the power driving device through the gearbox, and the power is transmitted to the front driving axle and the rear driving axle, so that the forward movement, the backward movement and the walking of the vehicle are realized; the utility model solves the defects that the single motor in the prior engineering machinery field which needs power walking and hydraulic power output has low driving efficiency and can not reasonably utilize electric energy; meanwhile, under the condition that the arrangement of the existing vehicle space, transmission parts such as a transmission shaft, a drive axle and the like and hydraulic pipelines is not changed, the double-motor integrated arrangement of the utility model can directly replace the existing engine, a torque converter and a hydraulic transmission gearbox which form a vehicle power assembly; the space of the original engine is emptied, and the engine can be used for arranging more power battery packs and electric control elements; simultaneously the utility model discloses the difficulty that the arrangement and the maintenance of prior art adoption bi-motor independent layout brought for the complete machine has still been solved.

The performance of the loader power assembly has a great influence on the dynamic property, the economical efficiency, the emission and the reliability of the whole loader. The electric loader directly utilizes the electric energy of the power battery, takes the motor as the power, can meet the requirements of the economy, the dynamic property and the comfort of the loader, and is an ideal transmission form. The motor has a wider stepless speed regulation range, good starting characteristic and higher transmission efficiency, and the motor and the two-gear power gear shifting transmission are integrated into a power assembly, so that the traction force and the speed requirement of the loader can be considered according to the working characteristics of the loader. Meanwhile, the power assembly can meet the independent driving of a hydraulic pump and a steering pump of the working device, so that the loader can obtain the best working performance, and the working efficiency is improved.

Embodiment 2, please refer to fig. 11, the traveling power input mechanism 224 is connected to the gearshift mechanism 225 by a traveling planetary gear set; the components and the transmission principle of the traveling planetary gear pair belong to known components, and the traveling power input mechanism 224 is transmitted to the next-stage speed change and gear shift mechanism 225 by the traveling planetary gear pair; the utility model discloses the preferred installation overall arrangement of walking planetary gear pair as follows: the planetary gear set comprises a sun gear 224-4 coaxially arranged on a power input shaft, a gear ring 224-3 is respectively connected with a high-gear clutch 225-4 and a low-gear clutch 225-5, a planet carrier 224-2 is connected with a first-stage output driving gear 225-7, the first-stage output driving gear 225-7 is meshed with a first-stage output driven gear 225-8, the first-stage output driven gear 225-8 is connected with an output driving gear 225-6, and the output driving gear 225-6 is connected with a front axle driving interface 229 and a rear axle driving interface 230 through an output driven gear 228-2.

In summary, the traveling power input mechanism 224 may be connected to the gearshift mechanism by a traveling planetary gear set or a traveling fixed-axis gear set; the gear pair with the fixed shaft has the advantages of simple structure, lower requirement on manufacturing precision and low processing cost; the planetary gear pair is composed of a planetary gear ring, a sun gear, a planet carrier, a brake and the like, and has the advantages of compact structure, small volume, light weight and large transmission ratio; the advantage of improving the efficiency of the transmission system can be realized; and the transmission is balanced, and the shock vibration resistance is strong.

Embodiment 3, please refer to fig. 12, the speed-changing and gear-shifting mechanism 225 has a compact structure, a small volume, a light weight, and a large transmission ratio; the variable speed planetary gear pair has the advantages of being capable of improving the efficiency of a transmission system, balanced in transmission and strong in shock and vibration resistance; the components of the planetary gear pair forming the speed change and gear shift mechanism 225 and the transmission principle belong to known components, and the embodiment utilizes the traveling planetary gear pair to realize the transmission of power to the next-stage power output mechanism; the utility model discloses the preferred installation overall arrangement of variable speed gearshift 225 is as follows: the speed change planetary gear pair comprises a sun gear 224-4 coaxially arranged on a power input shaft, a ring gear 224-3 is respectively connected with a high-gear clutch 225-4 and a low-gear clutch 225-5, a planet carrier 224-2 is connected with an output driving gear 225-6, and the output driving gear 225-6 is connected with a front axle driving interface 229 and a rear axle driving interface 230 through an output driven gear 228-2.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention, such as a transfer case may be provided with two PTOs or three PTOs; the power output box can be designed with an output flange; the high and low gears can be shifted by adopting a mechanical meshing sleeve in a sliding manner; the motor can be installed by two low-power motors in series, and the like; all should be included within the scope of the present invention.

Claims (10)

1. A power assembly for electric wheel type engineering machinery comprises a power assembly box body and a power unit arranged on the box body; the power unit comprises a working device power unit which is used for providing power input for driving the hydraulic pump to work by the action, the steering and the lubrication of accessories when the electric loader works; the walking power unit is used for providing power input for the running, reversing and accelerating processes of the vehicle; the method is characterized in that:

the power assembly box body comprises a gearbox, a transfer case and a power output case; the transfer case is positioned at the upper part of the gearbox; the power output box is positioned at the lower part of the gearbox; the gearbox, the transfer case and the power output case are in a communicated structure in the case body; the same side of the gearbox and the transfer case is of an open structure, and the open sides of the gearbox and the transfer case are respectively provided with a case cover;

the working device power unit comprises a working device driving motor, the working device driving motor is connected with a working power input shaft arranged in the transfer case, and a working power driving gear is arranged on the working power input shaft; a variable speed pump is coaxially arranged on the working power input shaft at the outer side of the transfer case; the working power driving gear is connected with at least one working driven gear through a gear pair, the working driven gear is installed on a corresponding working driven shaft, and the working driven shaft is installed on the transfer case through a supporting bearing; a hydraulic pump PTO interface is arranged on the transfer case opposite to the driving motor side of the working device and used for mounting a hydraulic pump of the working device, a steering hydraulic pump and a braking hydraulic pump, and a transmission pump PTO interface is arranged below the hydraulic pump PTO;

a walking driving motor mounting interface is arranged on the gearbox on the opposite side of the driving motor of the working device; a parking brake mounting seat for mounting a parking brake is arranged on the gearbox on the same side of the walking driving motor mounting interface;

the walking power unit comprises a walking driving motor arranged on a walking driving motor mounting interface; the walking power input mechanism is connected with the walking driving motor and is arranged on the upper layer of the gearbox; the speed-changing and gear-shifting mechanism is connected with the walking power input mechanism and is arranged on the lower layer of the gearbox; a gear shifting control valve mounting interface is arranged on the opposite side of the walking driving motor corresponding to the position of the speed changing and gear shifting mechanism; a gear shift operating valve is arranged on the gear shift operating valve mounting interface; the power output mechanism is connected with the speed change and gear shift mechanism and is arranged in the power output box; a front axle driving interface is arranged on one side of the power output box, and the front axle driving interface and the walking driving motor are positioned on the same side; the opposite side is equipped with rear axle drive interface, and front axle drive interface passes through the transmission shaft and is connected the front wheel rotation of drive vehicle with the front axle: the rear axle driving interface is connected with a rear axle through a transmission shaft to drive the rear wheels of the vehicle to rotate;

the power output mechanism comprises a walking power output shaft, the walking power output shaft is arranged in the power output box through bearing seats and bearings at two ends, and an output driven gear meshed with an output driving gear of the speed change gear shifting mechanism is arranged on the walking power output shaft; and the two ends of the power output shaft are provided with connecting flanges of a front axle drive and a rear axle drive.

2. The power train for an electric wheeled construction machine according to claim 1, wherein: the transfer case and the power output case are arranged diagonally relative to the gearbox or symmetrically or at the same side.

3. The power train for an electric wheeled construction machine according to claim 1, wherein: the opposite side transfer case of the driving motor of the opposite working device is provided with PTO interfaces for three hydraulic pumps; the upper left hydraulic pump PTO interface and the upper right hydraulic pump PTO interface are used for installing a hydraulic pump and a steering hydraulic pump of a working device, and the lower middle hydraulic pump PTO interface is a transmission pump PTO interface.

4. The power train for an electric wheeled construction machine according to claim 1, wherein: the walking motor mounting interface and the hydraulic pump PTO device interface on the transfer case are positioned on the same side or different sides.

5. The power train for an electric wheeled construction machine according to claim 1, wherein: the walking power input mechanism adopts a walking planetary gear pair to be connected with a speed-changing gear-shifting mechanism; the traveling planetary gear pair comprises a sun gear coaxially arranged on the power input shaft, a gear ring is respectively connected with a high-grade clutch and a low-grade clutch, a planet carrier is connected with a first-level output driving gear, and the first-level output driving gear is connected with the power output mechanism through a first-level output driven gear, an output driving gear and an output driven gear.

6. The power train for an electric wheeled construction machine according to claim 1, wherein: the walking power input mechanism adopts a walking fixed-shaft gear pair to be connected with a speed-changing gear-shifting mechanism; the walking fixed-axis gear pair comprises a power input shaft arranged at the upper part in the gearbox, and a high-speed driving gear and a low-speed driving gear are arranged on the power input shaft in the gearbox.

7. The power train for an electric wheeled construction machine according to claim 1, wherein: the speed-changing and gear-shifting mechanism adopts a speed-changing planetary gear pair; the speed change planetary gear pair comprises a sun gear coaxially arranged on the power input shaft, a gear ring is respectively connected with a high-grade clutch and a low-grade clutch, a planet carrier is connected with an output driving gear, and the output driving gear is connected with a front axle driving interface and a rear axle driving interface through an output driven gear.

8. The power train for an electric wheeled construction machine according to claim 1, wherein: the speed-changing and gear-shifting mechanism adopts a speed-changing fixed-shaft gear pair; the gear pair comprises a gear shifting shaft which is arranged in the gearbox through a supporting bearing; the gear shifting shaft is provided with a high-speed driven gear and a low-speed driven gear which are mutually meshed with the high-speed driving gear and the low-speed driving gear, and the gear shifting shaft is provided with a high-speed clutch and a low-speed clutch; a gear shifting control valve for controlling the high-gear clutch and the low-gear clutch to realize gear shifting is arranged at the end part of the gear shifting shaft; and an output driving gear connected with the power output mechanism is also arranged on the gear shifting shaft.

9. The power train for an electric wheeled construction machine according to claim 1, wherein: the power output shaft adopts a through shaft.

10. The power train for an electric wheeled construction machine according to claim 1, wherein: the power output shaft adopts a split shaft, and a clutch is connected between the two split shafts.

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