WO2006012802A1

WO2006012802A1 - Chassis for a road sweeping vehicle

Info

Publication number: WO2006012802A1
Application number: PCT/CN2005/001200
Authority: WO
Inventors: Guogui Zhao; Xiansheng Xu; Lie Shan
Original assignee: Yancheng Machine Tool Co., Ltd.
Priority date: 2004-08-06
Filing date: 2005-08-05
Publication date: 2006-02-09
Also published as: GB0704013D0; GB2431385B; GB2431385A

Abstract

A transmission for a working vehicle comprises a frame, an engine, a change-speed gearbox, a drive shaft and rear axles and so on. The input of a power take off is connected with the change-speed gearbox at a connecting port, the output of the power take off is serially connected with a hydraulic variable pump and a hydraulic gear pump. A reduction gearbox is mounted on the drive shaft. An input shaft is located inside the reduction gearbox, an end of which is connected with a driving hydraulic motor. A pair of reduction gears are engaged on the input shaft of the reduction gearbox and the drive shaft, one of which is connected with the drive shaft by a clutch. An accelerating pedal is connected with the hydraulic variable pump pedal. The present invention has the following advantages: when the vehicle is in job sites, the engine can drive stably both the vehicle and the working mechanism through the hydraulic transmission. When the vehicle moves to other sites, the engine can drive the vehicle quickly through the mechanical transmission. The configuration of the transmission is simple, with low manufacture cost and easy maintenance.

Description

Work vehicle transmission

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special-purpose vehicle chassis, and more particularly to a special-purpose vehicle chassis that can be driven alternately using both mechanical and hydraulic transmissions. BACKGROUND OF THE INVENTION With the development of economy and the advancement of science and technology, the market has continuously put forward new requirements for the performance of special-purpose vehicles, such as urban road sweepers, sprinklers, etc., such special vehicles must have driving when working. The power, but also the power to drive the machine with the car. The speed of this type of special-purpose vehicle is about 15 kilometers per hour. When the long-distance transition is required, it can be driven quickly. In the operation, it is required to ensure the quality of the work under the condition of variable speed driving, that is to say, the speed change cannot be changed due to the change of the road condition. The engine speed, which causes the power of the transmission supporting operation, affects the quality of the work. At present, the products of this type of special-purpose automobile chassis on the market are as follows: 1. The main and auxiliary engines of the two engines are respectively driven to drive and work the mechanical structure; 2. The single-engine tandem multi-hydraulic pump is driven by the full hydraulic mode. And the structural form of the work machine. The vehicle with dual-engine structure has high fuel consumption, high cost of use, and large models. The vehicle with single-engine tandem multi-hydraulic pump full hydraulic drive structure must meet the requirements of both the driving speed and the transition. The speed of driving, the hydraulic system has a large speed regulation range, complicated structure, high manufacturing cost, and the special hydraulic chassis driven by the full hydraulic transmission mode is generally produced in small batches by non-professional automobile manufacturers. The manufacturing quality is difficult to guarantee, and the chassis accessories are difficult. Poor versatility and high maintenance costs. The prior invention patent publication CN1049218A discloses a hydraulic transmission vehicle, relating to a hydraulic drive system in which a double-acting automatic variable-disconnected stator vane pump is driven by an engine, and the generated hydraulic fluid is transmitted to the drive through a circulation pipe. The hydraulic motor on the wheel drives the car through a hydraulic motor. The shortcoming is that during operation and transition, it can only be driven by hydraulic transmission, and the driving speed is slow, and the power cannot be simultaneously output to the running device and the supporting working machine.

The utility model publication specification CN2219579Y discloses a multi-purpose power output chassis. It is mainly composed of engine, bridge, multi-purpose box, drive axle, frame and steering axle. The multi-purpose box is arranged between the engine and the frame, and a multi-purpose shaft is installed on the left and right side walls of the multi-purpose box, and a bottom plate is arranged between the side walls, and a multi-purpose wheel is fixed on the multi-purpose shaft, which is characterized in that the multi-purpose box transmits power, and the hanging connection is paired. The material acts to provide a matching power for multiple implements and a chassis for driving at the same time. The insufficiency of the invention is that the speed of the engine is frequently changed in the low speed range of the engine due to the shifting, such as parking and starting, so that the power to provide the supporting operation is unstable, which affects the stable operation of the working mechanism, and cannot ensure stable operation. Quality of work. SUMMARY OF THE INVENTION The present invention overcomes the deficiencies of the prior art, and provides a special automobile chassis with parallel mechanical transmission and hydraulic transmission device, so as to solve the problem that the special-purpose vehicle is driven by mechanical transmission during the transition, and the transition speed is fast; When driving, the vehicle is driven by a hydraulic transmission, and it can provide the stable power required for the supporting operation.

In order to solve the above technical problems, the technical solution adopted by the present invention is: A special automobile chassis, including a frame 9 and a cab provided thereon 20. The engine 3, the transmission 5, the transmission shaft 11, the rear axle 10, and the engine throttle control pedal 2, wherein the input end of the transmission 5 is connected to the engine 3, and the output end of the transmission 5 is connected to one end of the transmission shaft 11. The power take-off interface of the gearbox 5 is connected to the input end of the power take-off 15 , and the other end of the drive shaft 11 is connected to the rear axle 10 . The output end of the power take-off 15 is connected with a variable hydraulic pump 13 and a gear hydraulic pump. 12, the engine throttle control pedal 2 is coupled with the variable hydraulic pump control pedal 1 as a linkage mechanism, and the transmission shaft 11 is provided with a reduction gear box 6 , and the reduction gear box 6 is provided with an input shaft 18, the input shaft 18 is connected to one end of the reduction gear box 6 and is connected with a driving hydraulic motor 8. The first gear 16 is fastened and mounted on the input shaft 18 of the reduction gear box 6. The clutch 7 is fastened and installed in the reduction gear box 6 to be driven. On the shaft 11, the final gear 17 is coupled to the clutch 7 and then fitted on the transmission shaft 11 in the reduction gear box 6. The gear 16 is geared down between the first gear 16 and the final gear 17, and the variable hydraulic pump 13 passes through the hydraulic oil pipe. Hydraulic oil tank 4, hydraulic valve manifold block 14 8 corresponds to the hydraulic motor is coupled with the power composition output to provide a hydraulic drive lorry supporting the work machine with a hydraulic drive circuit driving the gear pump 12 by a hydraulic pipe and the hydraulic oil tank 4, the hydraulic valve manifold assembly 14.

The hydraulic valve integrated block group 14 is provided with a regulated output device. The clutch 7 can be coupled to the final gear 17 and fastened to the drive shaft 11 or to the primary gear 16 for fastening to the input shaft 18.

The clutch 7 is an electromagnetic clutch or a mechanical clutch. The gear hydraulic pump 12 is one or more.

The intermediate speed position of the engine throttle control pedal 2 corresponds to the variable hydraulic pump controlling the zero position of the foot pedal 1 and is lockedly coupled.

The variable hydraulic pump controls the foot pedal 1 to control the form of electro-hydraulic Or mechanical hydraulic.

In the cab 20, a manual throttle control handle 19 is provided. According to the special vehicle modified by the special vehicle chassis according to the present invention, when the engine is running, the engine is coupled to the gearbox, and the transmission is disconnected to disconnect the transmission between the engine and the transmission and the transmission shaft. The clutch device in the power take-off is "closed", which is connected to the engine, the gearbox, the power take-off and the variable hydraulic pump, the transmission of the gear hydraulic pump, and the variable hydraulic pump to drive the hydraulic motor. The clutch in the control gearbox is "closed", which is connected to the transmission of the hydraulic motor and the transmission shaft. The driving hydraulic motor drives the vehicle through the reduction gear box and the transmission shaft to drive the rear axle, so that the engine is driven by hydraulic transmission during the running. The vehicle is driving. The engine throttle control pedal connection variable hydraulic pump control pedal becomes a linkage structure, the variable hydraulic pump controls the zero position of the foot pedal corresponding to the medium speed position locking connection of the engine throttle control pedal, and a manual throttle control handle is set, the engine After starting, the manual throttle control handle is operated to make the engine rotate at the medium speed. When the engine throttle control pedal is stepped on to reach the locked variable pressure pump control pedal zero position, the variable displacement hydraulic pump controls the pedal to manipulate the variable hydraulic pump. The variable transmission travels the hydraulic motor to shift the speed, the driving hydraulic motor drives the vehicle to shift speed, and the vehicle realizes the variable speed running by the hydraulic transmission. At this time, the engine speed is slightly fluctuated within the medium speed range with the change of the shifting load and the linkage of the engine throttle control pedal. The gear hydraulic pump is regulated by the hydraulic valve integrated block in the power take-off drive. The device outputs stable power to the supporting working machinery of the vehicle, which ensures the quality of the supporting work.

When the vehicle at the working distance needs to be driven at a long distance, the manual throttle control handle is reset, and the clutch device in the power take-off is "disengaged" to disconnect the engine, the transmission between the transmission and the variable hydraulic pump, and the gear hydraulic pump. , Operate the clutch in the gearbox as "off" and disconnect the hydraulic horse The transmission connection between the transmission shaft and the transmission shaft is operated, and the gearbox is operated from the hanging position to the forward or reverse driving position, so that the special vehicle modified by the special vehicle chassis of the invention can be driven by the mechanical transmission like the general vehicle. travel.

Compared with the prior art, the present invention has the following advantages and positive effects -

1. Since the modified special-purpose vehicle of the present invention fluctuates within the medium speed range during operation, the fluctuation range is small, and the hydraulic transmission mode and the voltage regulator device in the hydraulic valve integrated block group provide power for the on-vehicle operation machine, so It can provide stable power to the working machine under the working conditions of variable speed driving, and guarantee the quality of work.

2. Since the special automobile chassis of the present invention is provided with parallel mechanical transmission and hydraulic transmission driving driving device, the special automobile equipped with the invention can not only drive in full hydraulic driving mode but also provide stable power for supporting working machinery during operation. Moreover, in the same way as the ordinary car, the special vehicle can be driven by the mechanical transmission to drive quickly, with high mobility and high efficiency.

3. The special-purpose automobile chassis of the present invention can be assembled by the design scheme of the present invention, and has a simple structure, and can also be modified with a second-class automobile chassis. The steering, braking, front axle and rear axle portions of the chassis can be used for general-purpose accessories of automobiles. It is easy to repair and maintain, and the manufacturing and maintenance costs are low.

4. The special-purpose vehicle chassis of the present invention is a single-engine configuration, has low fuel consumption, is compact in structure, and can be converted into a small-sized special vehicle. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view of a special automobile chassis of the present invention;

2 is a top plan view of a special automobile chassis of the present invention; Figure 3 is a schematic view of the internal structure of the reduction gearbox of Figure 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

Ordinary car chassis have a cab, frame, engine, gearbox, drive shaft, rear axle, and engine throttle control pedals. The cab is mounted above the front of the frame, the engine throttle control pedal is mounted under the front of the cab, the engine is mounted on the front of the frame, the transmission is connected to the engine and mounted on the frame, and the front end of the drive shaft is coupled to the gearbox. The rear axle is coupled to the rear axle, and the rear axle axle is mounted below the rear of the frame. Engine throttle control pedal control Engine speed, engine transmission gearbox, transmission drive shaft, transmission shaft drive rear axle, engine through the transmission gearbox, drive shaft to achieve the transmission rear axle, the rear axle drive vehicle.

The special vehicle chassis of the present invention comprises a cab 20, a frame 9, a variable hydraulic pump control pedal 1, an engine throttle control pedal 2, a manual throttle control handle 19, an engine 3, a gearbox 5, a power take-off 15, and a variable. Hydraulic pump 13, gear hydraulic pump 12, hydraulic valve manifold block 14, travel hydraulic motor 8, gearbox 6, clutch 7, drive shaft 1 1, rear axle 10, hydraulic tank 4, primary gear 16, final gear 17. Input shaft 18 and universal joint 21. The cab 20 is mounted above the front of the frame 9, the engine 3 is mounted at the front of the frame 9, the input of the gearbox 5 is connected to the engine 3, and the output of the gearbox 5 is connected to one end of the drive shaft 1 1 , the gearbox 5 The power take-off interface is connected to the input of the power take-off 15 . The output end of the power take-off 15 is connected in series with the variable hydraulic pump 13 and the gear hydraulic pump 12, and the gear hydraulic pump 12 is more than one. The power take-off device 15 has a clutch device, and the clutch is operated by the power take-off device 15 The coupling and transmission between the gearbox 5 and the variable hydraulic pump 13 and the gear hydraulic pump 12 can be separated. The other end of the drive shaft 1 1 drives the rear axle 10, a reduction gearbox 6 is provided on the transmission shaft 11, and an input shaft 18 is arranged parallel to the transmission shaft 11 in the reduction gearbox 6. The traveling hydraulic motor 8 is mounted on one end of the one side input shaft 18 of the reduction gear box. A first gear 16 is fastened to the input shaft 18 in the reduction gear box 6, and the clutch 7 is fastened to the transmission shaft 11 in the reduction gear box 6 The final gear 17 is coupled to the transmission shaft 11 and coupled to the transmission shaft 11 of the reduction gear box 6. The gear 16 is geared down between the first gear 16 and the final gear 17, and the final gear 17 can be disengaged by operating the clutch 7. The coupling and transmission with the transmission shaft 11 serves as a transmission coupling between the driving hydraulic motor 8 and the transmission shaft 11. The clutch 7 is of an electromagnetic or mechanical type, and the clutch 7 can be coupled to the final gear 17 and then fastened to the drive shaft 11 or coupled to the primary gear 16 and fastened to the input shaft 18. The variable hydraulic pump 13, the traveling hydraulic motor 8, the hydraulic valve integrated block group 14, and the hydraulic oil tank 4 are correspondingly coupled by a hydraulic oil pipe to form a hydraulic transmission circuit for driving the vehicle, the gear hydraulic pump 12, the hydraulic valve integrated block group 14, and the hydraulic pressure The hydraulic tank 4 and a plurality of hydraulic motors and hydraulic cylinders of the accompanying working machine are hydraulically connected to form a hydraulic transmission circuit for driving the supporting working machine (the hydraulic transmission circuit is not shown in the drawing, and the supporting working machine is not shown). A number of hydraulic motors, hydraulic cylinders, and a hydraulic valve manifold block are provided with a regulated output device. The hydraulic valve integrated block group 14 and the hydraulic oil tank 4 are respectively mounted on the frame 9, and the variable hydraulic pump 13 draws hydraulic oil from the hydraulic oil tank 4 through the hydraulic valve integrated block group 14 and the hydraulic oil circuit to drive the traveling hydraulic motor 8 by hydraulic transmission. . The manual throttle control handle 19 is mounted in the cab 20, the variable hydraulic pump controls the foot pedal 1, the engine throttle control pedal 2 is mounted below the front portion of the cab 20, and the engine throttle controls the intermediate speed position of the foot pedal 2 Variable hydraulic pump control foot The zero position of the pedal 1 corresponds to the lock coupling to be a linkage structure, and the control mode of the variable hydraulic pump control pedal 1 may be electro-hydraulic or mechanical hydraulic. By operation, the transmission shaft 1 1 can be driven by the transmission 5 or the driving hydraulic motor 8 to drive the rear axle 10, and the rear axle 10 drives the vehicle to travel.

When the work is running, the engine is disconnected by operating the gearbox 5

3. The gearbox 5 is connected to the mechanical transmission of the transmission shaft 11; the clutch device in the power take-off device 15 is combined, and the engine 3 is coupled to the transmission of the variable hydraulic pump 13 and the gear hydraulic pump 12 through the gearbox 5 and the power take-off 15; The clutch 7 in the reduction gearbox 6 is engaged, and the transmission between the traveling hydraulic motor 8, the input shaft 18, the primary gear 16, the final gear 17 and the transmission shaft 11 is coupled. Since the mechanical transmission between the connecting engine 3 and the transmission shaft 11 is interrupted by the operation of the transmission gearbox 5, the engine 3 is driven by the transmission 5 to the power take-off 15 and then the variable hydraulic pump 13, the gear hydraulic pump 12, the variable hydraulic pressure The pump 13 draws hydraulic oil from the hydraulic oil tank 4 and drives the traveling hydraulic motor 8 through the hydraulic valve integrated block group 14 and the hydraulic oil circuit. The traveling hydraulic motor 8 passes through the input shaft 18, the primary gear 16, the final gear 17, The clutch 7 drives the transmission shaft 11 and then the rear axle 10 drives the vehicle to travel, so that the engine 3 drives the vehicle in a hydraulic transmission mode during operation. After the engine 3 is started, the manual throttle control handle 19 is operated to rotate the engine 3 at a medium speed, the engine 3 is driven by the transmission 5, the power take-off 15 to drive the variable hydraulic pump 13, and the gear hydraulic pump 12 is rotated; the engine throttle control pedal 2 is stepped on; After reaching the zero position of the variable hydraulic pump control pedal 1, continue to step on the engine throttle control pedal 2, then interlock variable hydraulic pump control pedal 1 manipulate variable hydraulic pump 13 variable output drive travel hydraulic motor 8 shifting rotation, driving The hydraulic motor 8 drives the transmission shaft 11 through the input shaft 18, the primary gear 16, the final gear 17, and the clutch 7 to drive the transmission shaft 11. The rear axle 10 drives the vehicle to shift speed, and the vehicle realizes the variable speed running through the control system and the hydraulic transmission system. Due to The change of the load during the shifting operation and the change of the engine throttle pedal. The position of the plate 2, the rotational speed of the engine 3 slightly fluctuates within the medium speed range, and simultaneously provides the driving vehicle shifting and supporting through the variable hydraulic pump 13 and the gear hydraulic pump 12. The power of the work; the gear hydraulic pump 12 of the serial variable hydraulic pump 13 is driven by the power take-off 15, and the hydraulic oil is sucked from the hydraulic oil tank 4 through the hydraulic oil pipe and the pressure regulating device in the hydraulic valve manifold block 14 to provide stability. The supporting operation power transmission is carried out by several hydraulic motors and hydraulic cylinders of the vehicle supporting working machinery (several hydraulic motors and hydraulic cylinders of the accompanying working machinery are not shown in the figure). When the special vehicle modified by the special automobile chassis of the present invention is operated, the vehicle is driven by the hydraulic transmission in a variable speed manner and provides stable power for the on-board operation.

Manipulating the manual throttle control handle when the job ends a long distance transition

19 reset; the clutch device in the power take-off device 15 is the drive connection of the engine 3, the gearbox 5 and the variable hydraulic pump 13, and the gear hydraulic pump 12; the clutch 7 in the gearbox 6 is operated to be disconnected, disconnected The transmission connection between the driving hydraulic motor 8 and the transmission shaft 1 1; the operation of the transmission 5 is suspended from the neutral position to the forward or reverse gear, thus realizing the coupling of the engine 3 to drive the vehicle in a mechanical transmission manner. The engine 3 drives the gearbox 5, the gearbox 5 drives the drive shaft 11, the drive shaft 11 drives the rear axle 10, and the rear axle 10 drives the special vehicle. The special vehicle modified by the special automobile chassis of the invention drives the vehicle to travel by mechanical transmission, and the vehicle has good maneuverability and fast transition speed.

The special automobile chassis of the present invention can also be modified with the second type automobile chassis. Referring to FIG. 3, the original transmission shaft 11 on the second type automobile chassis can be disconnected for the convenience of installation, and the reduction gear box 6 is set on the disconnected transmission shaft 1 1 . The clutch 7 is fastened and mounted on the transmission shaft 1 1 of the reduction gear box 6. The non-stage gear 17 is coupled to the clutch 7 and then fitted on the transmission shaft 11 of the reduction gear box 6 in the reduction gear box 6 The input shaft 18 is mounted parallel to the drive shaft 11, and the first gear 16 is fastened and mounted on the input shaft 18 and meshed with the extension gear 17, and the external input shaft 18 of the reduction box 6 is mounted with the driving hydraulic motor 8, and then The disconnected drive shaft 11 is coupled to the joint 21. Special vehicle chassis assembled in accordance with the design of the present invention or retrofitted with a second type of automotive chassis are also within the scope of the present invention. The above is only another embodiment of the present invention, and the mounting of the reduction gear box 5 by other means is also within the scope of the present invention.

The gear transmission in the reduction box 5 can be designed as a multi-axis, multi-stage gear transmission, and is also within the scope of the present invention.

Claims

Claim

1. A special vehicle chassis comprising a frame (9) and a cab (20), an engine (3), a gearbox (5), a drive shaft (11), a rear axle (10), The engine throttle control pedal (2), wherein the input end of the gearbox (5) is connected to the engine (3), the output end of the gearbox (5) is connected to one end of the transmission shaft (11), and the gearbox (5) is taken The force device interface is connected to the input end of the power take-off (15), and the other end of the drive shaft (11) is connected to the rear axle (10), wherein: the output end of the power take-off (15) is connected with variable hydraulic pressure a pump (13), a gear hydraulic pump (12), the engine throttle control foot pedal (2) and a variable hydraulic pump control foot pedal (1) are coupled as a linkage mechanism, and are set on the transmission shaft (11) There is a reduction gear box (6), an input shaft (18) is arranged in the reduction gear box (6), and a driving hydraulic motor (8) is connected to one end of the input shaft (18) through the reduction gear box (6). The primary gear (16) is fastened to the input shaft (18) in the gearbox (6), clutch (7) It is fixed on the transmission shaft (11) in the gearbox (6). The final gear (17) is connected to the clutch (7) and then placed on the transmission shaft (11) in the reduction gearbox (6). The primary gear (16) and The final gear (17) is a gear reduction gearing transmission, and the variable hydraulic pump (13) is composed of a hydraulic oil pipe and a hydraulic oil tank (4), a hydraulic valve integrated block group (14) and a traveling hydraulic motor (8). The driving hydraulic transmission circuit, the gear hydraulic pump (12) provides the hydraulic transmission power output to the on-board supporting working machinery through the hydraulic oil pipe and the hydraulic oil tank (4) and the hydraulic valve integrated block group (14).

2. A dedicated vehicle chassis according to claim 1, wherein: said hydraulic valve manifold block (14) is provided with a regulated output device.

3. A special vehicle chassis according to claim 1, wherein: said clutch (7) is coupled to the final gear (17) and is fastened and mounted. On the drive shaft (11), or after coupling with the primary gear (16), it is fastened to the input shaft (18).

A special vehicle chassis according to claim 1 or 3, characterized in that the clutch (7) is an electromagnetic clutch or a mechanical clutch.

A special vehicle chassis according to claim 1, wherein: said gear hydraulic pump (12) is one or more.

The special vehicle chassis according to claim 1, characterized in that: the medium speed position of the engine throttle control pedal (2) corresponds to the zero position of the variable hydraulic pump control pedal (1) and is lockedly coupled.

The special vehicle chassis according to claim 1, wherein: said variable hydraulic pump control pedal (1) is controlled in the form of electro-hydraulic or mechanical hydraulic.

A special vehicle chassis according to claim 1, characterized in that: in the cab (20), a manual throttle control handle (19) is provided.