GB2431385A

GB2431385A - Chassis for a road sweeping vehicle

Info

Publication number: GB2431385A
Application number: GB0704013A
Authority: GB
Inventors: Xiansheng Xu; Guogui Zhao; Lie Shan
Original assignee: YANCHENG MACHINE TOOL CO Ltd
Current assignee: YANCHENG MACHINE TOOL CO Ltd
Priority date: 2004-08-06
Filing date: 2005-08-05
Publication date: 2007-04-25
Anticipated expiration: 2025-08-05
Also published as: GB2431385B; GB0704013D0; WO2006012802A1

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

Transmission Mechanism for Special-Purpose Vehicles

Technique Field

The invention deals with a Transmission Mechanism for Special-Purpose Vehicles, which is mainly driven by mechanical and hydraulic transmission ways alternately.

Background Technique

Along with the development of economy and progress of science and technology, market is constantly putting forward new performance requirements of special-purpose vehicles. For example, special-purpose vehicles such as city road sweeper and water sprinkler not only have driving power during work but also have mechanical power for the need of on-board work. The working speed of this kind of special-purpose vehicles is about 15 km per hour, and high speed is required during long distance driving, quality should be assured under the condition of variable speed. That means the rotating speed of vehicle engine could not vary along with change of the road status, otherwise the transmission power that drives relative devices will not stable and affects working quality. At present, the main products of the Transmission Mechanism for Special-Purpose Vehicles in the market are: 1.

Double engines structure that supply power for driving and machine working respectively; 2. Single engine structure that links multiple hydraulic pumps and provide driving and working devices a whole hydraulic environment. Double engines results high oil exhaust and high cost, and this kind of vehicles have a great bulk. The single engine vehicle links with multi-hydraulic pumps driving structure not only be adapted to a driving speed during work but also should meet high speed when changing working place. Hydraulic system has a large speed adjusting scope, complicated structure and high producing cost. The Transmission Mechanism for Special-Purpose Vehicles that is driven and operated in a complete hydraulic way is often made in a small scale by non specific vehicle manufacturing factories, manufacturing quality is difficult to make assure, the interchange quality of the chassis is not good, and maintain cost is high.

In former applied invention patent public specification CN 104921 8A a kind of hydraulic transmission automobile is issued and refers to a hydraulic pressure driving system----engine drives a double-action variable-displacement divided vane pump to run, produced hydraulic liquid is transferred to hydraulic motor on the driving wheel through circular pipeline, thus the automobile is driven by hydraulic motor. The shortage is hydraulic transmission is the only driving way during operation and transition, including low driving speed, and the output power can not supply driving device and matched operational mechanism simultaneously.

In former applied utility model patent public specification CN2219579Y a kind of multiple power output chassis is issued, which mainly consists of engine, cab, multi-function case, drive axle, bracket and steering axle. The multi-function case is located between engine and bracket, a multifunction shaft is fixed on both sides of the multi-function case, and between the sides of the multi-function case there is a soleplate. The multi-function wheel is fixed on the multi-function shaft, the character is: Multi-function case is used to transfer power, machine tools works on the materials. Providing matched power for multi-machine tools and driving chassis simultaneously. The shortcoming of the invention lies in: due to the variable speed driving such as stop and restart, the rotate speed of engine is bound to alternate frequently in a low rotate speed range, thus the power for matched operation is unstable and affects the stability of the operational mechanical device.

The operation quality can not be ensured.

Invention Content The invention overcomes the shortcoming of present technology and provides a special-purpose chassis with paralleled mechanical transmission and hydraulic transmission devices. The invention settles the problems of acquiring a high speed by mechanical transmission way when transferring places and running in variable-speed and supplying stable power for matched operation needs at the same time when driving in operational condition.

In order to tackle this technique problem, the invention adopts following technique scheme: A Transmission Mechanism for Special-Purpose Vehicles includes frame 9, upside frame 20, engine 3, gear-box 5. shaft 11, rear axle 10 and engine throttle control pedal 2, among them the input of gearbox 5 is connected with engine 3, the output of gear-box 5 is connected with one end of shaft 11, the prehensor interface of gear-box 5 is connected with the input of prehensor 15, the other end of the shaft II is connected to the rear axle 10, the output of the aforementioned prehensor 15 is tandem connected with the variable displacement pump 13 and gear hydraulic pump 12, the connection between the aforementioned engine throttle control pedal 2 and the variable displacement pump control pedal 1 is a interlinked structure, the aforementioned shaft 11 is assembled to a decelerator-box 6, the input shaft 18 is fixed inside the decelerator-box 6, one end of the aforementioned input shaft 18 protrudes out the side of the decelerator box 6 and is connected with the hydraulic motor 8, the first step gear 16 is fixed on the shaft 18 inside the decelerator-box, clutch 7 is fixed on shaft 11 inside the decelerator-box 6, final step gear 17 connected with clutch 7 is assembled on shaft 11 inside decelerator-box 6, there is a speed down gear engaging transmission between first step gear 16 and final step gear, the aforementioned variable displacement pump 13 is connected with hydraulic tubing, hydraulic oil tank 4, hydraulic valve integrated module 14 and driving hydraulic motor 8 to form driving hydraulic transmission circuit, through hydraulic oil tank 4 and hydraulic valve integrated module 14, gear hydraulic pump 12 provides hydraulic power output for on-board operating machines.

The hydraulic valve integrated module 14 includes a stable pressure output device.

The clutch 7 may be linked with final step gear 17 and then be fixed on the drive shaft 11, or it may be linked with first step gear 16 and then be fixed on the input shaft 18. )

The clutch 7 may be an electromagnetic clutch or a mechanical drive clutch.

The number of the gear hydraulic pump is one or more than one, The medium speed position of engine throttle control pedal 2 corresponds to the zero position of variable displacement pump control pedal 1, and the corresponding linkage is locked.

The control form of variable displacement pump control pedal I is electrohydraulic type or mechanical hydraulic type.

In cab 20 a manual throttle control handle 19 is fixed.

When a special-purpose vehicle whose chassis is mollified according to the invention is on working, the engine is connected with gear-box. If the gear-box is in neutral, the engine is detached from gear-box and the drive shaft. Manipulating prehensor clutch to "closure" position to link engine, gear-box, prehensor, variable displacement pump and gear hydraulic pump. Manipulating decelerator-box clutch to "closure" position to link transmission of hydraulic motor and shaft, hydraulic motor drives vehicle to move through decelerator-box, drive shaft and rear axle and fulfill that engine drive vehicle to run in a hydraulic transmission way. Engine throttle control pedal connection alters hydraulic pump control pedal into a linkage structure. There is a corresponding interlock- linkage between the zero position of variable displacement pump control pedal and the medium speed position of the engine throttle control pedal. A manual throttle control handle is designed, when engine is started, manipulating manual throttle handle to ensure engine to run at a medium rotating speed, trampling down engine throttle pedal to reach control pedal zero position of the interlock-linked variable displacement pump, then linked variable displacement pump control foot pedal alter hydraulic pump variable transmission hydraulic motor to rotate at a variable speed, and hydraulic motor drives vehicle to move at a variable speed, vehicle realizes to move at a variable speed through a hydraulic transmission way. At the time, the rotating speed of the engine fluctuates slightly in medium speed range along with the change of the load on the way and throttle control pedal change of the linked engine. Gear hydraulic pump supplies on-board operation mechanism with stable dynamic power through a stable pressure device of the hydraulic valve integrated module under prehesor transmission, and ensures matched operation's quality.

When the vehicle moves to a long distance work spot and needs rapid moving, you could replace throttle control manual handle, make prehensor clutch detached from engine, gear-box, variable displacement hydraulic pump, gear hydraulic pump, let gear-box' status changes from natural to moving ahead or reverse. Thus vehicle with the invention-Transmission Mechanism for Special-Purpose Vehicles can run fast by a mechanical transmission way as normal vehicles can do.

Competed with present techniques, the invention has following advantages and positive effects: 1. Since the speed of the engine of the special-purpose vehicle that is modified according to the invention fluctuates within medium speed range, the range of fluctuation is small, and the engine provides on-board operational mechanism power through the stable pressure device of the hydraulic transmission and hydraulic valve integrated module, the operational mechanism can be supplied with stable pressure under the condition of variable speed, and the operation quality is ensured.

2. Since the Transmission Mechanism for Special-Purpose Vehicles of the invention is fixed with parallel mechanical transmission and hydraulic transmission devices, the special-purpose vehicle of the invention not only can move and provide matched operational mechanism with stable power in a complete hydraulic transmission way during work, but also can run fast by mechanical transmission way like normal cars at the time of changing work spot and has strong mobility and high efficiency.

3. The special-purpose chassis of the invention can be assembled according to design scheme of the invention. Its structure is simple and also can be modified by second class vehicle chassis, and the chassis' steering, brake, front axle and rear axle can be maintained and replaced by standard fittings, and the manufacturing and maintain cost is cheap.

4. The special-purpose chassis of the invention is configured with a single engine and is of low oil exhaust and compact structure, which is easy to be modified into a mini special-purpose vehicle.

Figure Description

Fig. 1 is the front-view of the invention-a Transmission Mechanism for Special-Purpose Vehicles.

Fig. 2 is the top-view of the invention-a Transmission Mechanism for Special-Purpose Vehicles.

Fig. 3 is the inside structure sketch of the decelerator-box shown in figure 2.

Practice Example of the Invention Next we will make a further detail explanation for the practice mode of the invention with the help of attached figures.

A normal car chassis includes cab, frame, engine, gear-box, shaft, rear axle and engine throttle control pedal. The cab is located on the top of the frame foreside.

Engine throttle control pedal is fixed on the bottom of the cab foreside. Engine is fixed in the front of the frame. Gear-box with engine is fixed on the frame. The front end of the shaft links gear-box, and its back end links rear axle. Rear axle is fixed on the downside of the frame rear. Engine throttle control pedal controls the rotating speed of the engine. Engine drives gear-box, gear-box drives drive-shaft, the shaft drives rear axle, engine achieves to drive rear axle, and the rear axle drives the vehicle.

The invention-a Transmission Mechanism for Special-Purpose Vehicles includes cab 20, frame 9, variable displacement hydraulic pump control pedal 1, engine throttle control pedal 2, manual throttle control handle 19, engine 3, gear-box 5, prehensor 15, variable displacement hydraulic pump 13, gear hydraulic pump 12, hydraulic valve integrated module 14, hydraulic motor 8, decelerator-box 6, clutch 7, drive shaft 11, rear axle 10, hydraulic oil tank 4, fist step gear 16, final step gear 17, input shaft 18 and universal joint 21. The cab 20 is located on the top of the frame 9 foreside. Engine 3 is fixed on the front side of the frame 9. the input end of the gear-box 5 is connected to engine 3, the output end of the gear-box 5 is connected to one end of the drive shaft 11, the prehensor interface of the gear-box 5 is connected to the input end of the prehensor 15. The output end of the prehensor is tandem connected with variable displacement hydraulic pump 13 and gear hydraulic pump 12, the number of the gear hydraulic pump 12 is more than one.

There is a clutch device inside prehensor 15, the linkage and transmission among gear-box 5, variable displacement hydraulic pump 13 and gear hydraulic pump 12 can be detached and linked by manipulating the clutch device inside prehensor 15.

One end of the drive shaft 11 drives rear axle 10, decelerator-box 6 is assembled on the drive shaft 11, and input shaft 18 is fixed inside decelerator-box 6 and is paralleled to drive shaft 11. Hydraulic motor 8 is fixed on the side input shaft 18 inside the decelerator-box 6, first step gear 16 is fixed on the input shaft 18 inside the decelerator-box 6, clutch 7 is tightly fixed on the drive shaft 11 inside the deceleratorbox 6, final gear 17 linked with clutch 7 is assembled on drive shaft 11 inside the decelerator-box 6, the relationship between first step gear 16 and final gear 17 is gear speed-down gearing transmission. Detaching and connecting final gear 17 and drive shaft 11 by control clutch 7 controls the detaching and connecting relationship between the hydraulic motor 8 and drive shaft 11. Clutch 7 may be electro-magnetic or mechanical. The aforementioned clutch 7 connected with final gear 17 is tightly fixed on the drive shaft 11, or connected with the first step gear 16 it is tightly fixed on the input shaft 18. Altering hydraulic pump 13, hydraulic motor 8, hydraulic valve integrated module 14 and hydraulic oil tank 4 are linked through hydraulic pressure tubing to form a vehicle moving hydraulic transmission circuit.

Gear hydraulic pump 12, hydraulic valve integrated module 14, hydraulic tank 4 and some hydraulic motors and hydraulic tanks that match operational mechanism are correspondingly linked to form a hydraulic transmission circuit that drives matched operational mechanism (hydraulic transmission circuits, hydraulic motors and hydraulic tanks that match operational mechanism are not illustrated), stable pressure output device is contained in the hydraulic valve integrated module.

Hydraulic vafve integrated module 14 and hydraulic tank 4 are fixed on the frame 9 respectively, variable displacement hydraulic pump 13 pumps oil through hydraulic valve integrated module 14 from the hydraulic tank 4 to drive hydraulic motor 8 in a hydraulic tubing transmission way. Manual throttle control handle 19 is fixed inside the cab 20, variable displacement hydraulic pump control pedal I and engine throttle control pedal 2 are fixed on the bottom in the front of the cab 20. The medium speed position of engine throttle control pedal 2 corresponds to the zero position of variable displacement pump control pedal 1, and the corresponding linkage is locked. Variable displacement hydraulic pump control pedal 1 may be electro-hydraulic or mechanism-hydraulic. Driven by gear-box S and hydraulic motor 8 respectively, the aforementioned drive shaft 11 drives rear axle 10 through manipulation, the rear axle 10 drives vehicle to move. I0

If gear-box 5 is in neutral during driving, the connection transmission among engine 3, gear-boxing 5 and drive shaft 11 is broken. If the clutch of the prehensor is joined, engine 3 drives variable displacement hydraulic pump 13 and gear hydraulic pump 12 through gear-box 5 and prehensor 15; If the clutch 7 of the decelerator-box 6 is joined, the transmission among hydraulic motor 8, input shaft 18, first step gear 16 and drive shaft ii is connected. Since the transmission that is connected with engine 3 and drive shaft 11 is broken as gear-box 5 is set in neutral, engine 3 drives prehensor 12 through gear-box 5, and. then drives variable displacement hydraulic pump 13, gear hydraulic pump 12, variable displacement hydraulic pump 13 imbibes hydraulic oil from hydraulic tank 4 by hydraulic motor 8, which is driven by hydraulic valve integrated module 14 and hydraulic tubing in a hydraulic transmission way. Hydraulic motor 8 drives drive- shaft 11 through input shaft 18, first step gear 16, final step gear 17 and clutch 7, and then drives rear axle 10 to drive vehicle run, thus engine 3 achieves to drive vehicle to move with a hydraulic way during work. As engine 3 is started, wind manual throttle control handle 19 to make engine 3 rotate at a medium speed, engine 3 drives variable displacement hydraulic pump 13 and gear hydraulic pump 12 to rotate though gear-box 5 and prehensor 15; Trample engine throttle control pedal 2 till variable displacement hydraulic pump 1 reaches its zero position, then continue to trample engine throttle control pedal 2 to achieve that linked variable displacement hydraulic pump control pedal 1 drives variable displacement hydraulic pump 13 to drive hydraulic motor 8 to rotate at a variable speed, hydraulic motor 8 drives

II

drive-shaft 11 though input shaft 18, first step gear 16, final step gear 17 and clutch 7, and drives rear axle 10 next to drive vehicle to run at a variable speed, vehicle achieves running at a variable speed though control system and hydraulic transmission system. For the changing of the load onboard and the position of the engine throttle control pedal 2 during moving, the rotating speed of engine 3 fluctuates in the range of medium speed, and the power that drives vehicle to run at a variable speed and to do matched operation is supplied by variable displacement hydraulic pump 13 and gear hydraulic pump 12 at the same time. Driven by prehensor 15 gear hydraulic pump 12 that is connected with variable displacement hydraulic pump 13 imbibes oil from hydraulic tank 4, and supplies hydraulic motors and hydraulic tanks of the onboard matched operational mechanism with stable power through the stable pressure device in hydraulic tubing and hydraulic valve integrated module 14 (hydraulic motors and hydraulic tanks of the onboard matched operational mechanism are not in the figures) . The vehicle which is modified with the chassis of the invention is driven in a hydraulic transmission way and provides stable power for onboard matched operation during work.

When transferring faraway workspot, reset the manual throttle control handle 19, disengage the clutch in the prehensor 15, break the connection between engine 3, gear-box 5 and variable displacement hydraulic pump 13, gear hydraulic pump 12., disengage the clutch 7 in decelerator-box 6, break the connection between hydraulic motor 8 and drive shaft 11; Let gear-box 5 transfer from neutral to front or reverse, thus engine 3 achieves the connection that drives vehicle in a ) . ..

mechanical transmission way. Engine 3 drives gear-box 5, gear box 5 drives drive shaft 11, drive shaft 11 drives rear axle 10, and rear axle 1 0 drives the special-purpose vehicle. The special-purpose vehicle modified with the chassis of the invention is driven in a mechanical transmission way during transfer. The vehicle has a excellent mobility and runs at a high speed.

The Transmission Mechanism for Special-Purpose Vehicles of the invention may be modified from second class chassis, see fig. 3. For the convenience of assembly, may break the original shaft 11 on the second class chassis, assemble decelerator-box 6 on the broken drive shaft 11, tightly fix clutch 7 on the shaft 11 in the decelerator-box 6, assemble final step gear 17 linked with clutch 7 on the shaft 11 in the decelerator-box 6, fix input shaft 18 paralleled to drive shaft 11 in the decelerator-box 6, first step gear 16 is fixed tightly on the input shaft 18 and engaged with final step gear 17, one end of the input shaft 18 outside the decelerator-box 6 is fixed on the hydraulic motor 8, then link the broken drive shaft with a universal joint. According to the design scheme of the invention to assemble a Transmission Mechanism for Special-Purpose Vehicles or modif' a second class chassis is within the protection range of the invention. All above is only a operation scheme of the invention, and applying other method to fix decelerator-box 5 is also within the protection range of the invention.

Gear transmission inside decelerator-box 5 can be designed as multi-shaft and multi-step gear transmission, and this is also within the protection range of the invention.

Claims

Patent Right Claims 1. A Transmission Mechanism for Special-Purpose

Vehicles, which includes frame (9), the cab (20) above, engine (3) , gear-box (5) , drive shall (11) , rear axle (10) , engine throttle control pedals (2), among them the input of gear-box (5) is connected to engine (3), the output of gear-box (5) is connected to one end of drive shall (11), the prehensor interface for gear-box (5) is connected to prehensor (15) input, the other end of the drive shaft (11) is connected to the rear axle (10) . The characters lie in: the output of the prehensor (15) mentioned above is connected with the variable displacement pump (13) and gear hydraulic pump (12), the connection between the aforementioned engine throttle control pedal (2) and the variable displacement pump control pedal (1) is a interlinked structure, the aforementioned shall (11) is assembled to a decelerator-box (6), and an input shaft (18) is fixed inside the decelerator-box (6), one end of the aforementioned input shaft (18) that protrudes out the side of the decelerator box (6) is fixed to a hydraulic motor (8), the first step gear (16) is fixed on the shaft (18) inside the decelerator-box, clutch (7) is fixed on shaft (11) inside the decelerator-box (6), final step gear (17) connected with clutch (7) is assembled on shaft (11) inside decelerator-box( 6), there is a speed down gear engaging transmission between first step gear (16) and final step gear, the aforementioned variable displacement pump (13) is connected with hydraulic tubing, hydraulic oil tank (4) , hydraulic valve integrated module (14) and driving hydraulic motor (8) to form driving hydraulic transmission circuit, through hydraulic oil tank (4) and hydraulic valve inteated module (14) , gear hydraulic pump (12) provides hydraulic drive power output for on-board operating machines.
2. According to the right claim 1, one character of the special-purpose chassis lies in: the hydraulic valve integrated module (14) includes a stable pressure output device.
3. According to the right claim 1, one character of the aforementioned Transmission Mechanism for Special-Purpose Vehicles lies in: clutch (7) may be linked with final step gear (17) and then be fixed on the shaft (11), or it may be linked with first step gear (16) and then be fixed on the input shaft (18).
4. According to the right claim 1 or 3, one character of the aforementioned Transmission Mechanism for Special-Purpose Vehicles lies in: the clutch (7) is an electromagnetic clutch or a mechanical drive clutch.
5. According to the right claim I, one character of the aforementioned Transmission Mechanism for Special-Purpose Vehicles lies in: the number of the gear hydraulic pump is one or more than one.
6, According to the right claim I, one character of the aforementioned Transmission Mechanism for Special-Purpose Vehicles lies in: the medium speed position of engine throttle control pedal (2) corresponds to the zero position of variable displacement pump control pedal (1) , and the corresponding linkage is locked.
7. According to the right claim 1, one character of the aforementioned Transmission Mechamsm for Special-Purpose Vehicles lies m: the control form of variable displacement pump control pedal (1) is electro-hydraulic type or mechanical hydraulic type.

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8. According to the right claim 1, one character of the aforementioned Transmission Mechanism for Special-Purpose Vehicles lies in: in cab (20) a manual throttle control handle (19) is fixed.