휠 로더

Hereinafter, the present invention based on the embodiment of wheel loader related to form drawing through a browser substrate.

[Number 1 embodiment form]

The present invention also related to wheel loader of Figure 1 shows a side representing number 1 embodiment form are disclosed. As shown auditory canal 1, number 1 embodiment form at least one associated wheel loader, body frame (1) and, in a driver's cab (2) and, wheel i.e. front wheel (9) and a rear wheel (10) and, body frame (1) mounted work device (3) with disclosed. Work device (3) is, degree angle movable lift arm (4) and, in the lift arm (4) for driving a lift cylinder (6) on, lift arm (4) mounted at the front end of, silica sand which bucket (5) and, the bucket (5) that moves vertically rotating a bucket cylinder (7) on, bucket (5) and a bucket cylinder (7) link mechanisms constituting a bell crank (8) contains a.

Figure 2 shows a form also number 1 embodiment with electric, hydraulic circuit are disclosed.

As shown auditory canal, number 1 embodiment forms, body frame (1) mounted engine (17) and, engine (17) driven by the HST variable capacity type hydraulic pump (11) and HST pump (11) driven by HST in pressure type discharged from motor (14) including a hydraulic closed circuit and, engine (17) driven by, work device (3) for discharging the hydraulic control device for operating the working machine pump (13) with disclosed. In addition number 1 embodiment forms, HST pump (11) for discharging a hydraulic control number the HST charge pump (12) on, HST motor (14) driving force by wheel (9), rear wheel (10) is transmitted to the driving wheels system (24) valuable minerals. Working pump (13) discharged from pressure type, control valve (35) working through an device (3) as lift cylinder (6) is sent to a.

In addition, number 1 embodiment forms, work device (3) lift arm (4) is lifted up a threshold value, for example control valve (35) and the lift cylinder (6) forms a pressure detector for detecting pressure of bottom it will load in communication pipe (23) on, workload is a light load under job mode when power mode, when the workload is in work mode under echo at a work mode selection unit selecting one (22) on, engine (17) of the thread number rpm engine rpm sensor (25) with, these inputs information in the device number, i.e. controller (18) with disclosed. Controller (18) information outputted from, HST pump number control unit (15) number on HST motor control section (16) is sent to a. HST pump number control unit (15) is, controller (18) according to the instructions from the host, HST pump (11) and the pressure of a number a (pump input torque), HST motor number control unit (16) is, controller (18) according to the instructions from the host, HST motor (14) of the swash plate (motor output torque) decodes a number.

In addition, controller (18) is, swash plate pump (pump input torque) and controls the engine revolution number becomes broader HST pump control section (15) is a number etched. In addition, controller (18) is, HST (HST motor (15) for driving pressure) in an exhaust pressure pump motor swash plate (motor output torque) is increased by increasing the swash plate toward maximum, the discharge pressure of the pump by an HST motor swash plate toward the swash plate cover the lower minimum number HST motor control section (16) exposed to a number.

The bigger the traveling torque is increased and the swash plate motor, small so that the traveling speed increases, the swash plate to minimum rate can be reached. The, borer large slow running, high speed low torque traveling 1.000.

Figure 3 shows a system with a number indicating the number 1 embodiment also form also block, with Figure 4 number 1 embodiment form hole controller processing indicates an order in which flow chart, the surface properties is obtained in the form Figure 5 number 1 embodiment are disclosed.

3 also through the controller (18) is, as shown in fig. 5, input torque for engine rpm HST pump relationship map as a body (28) have a (reference 3 also). The map is, work mode selection unit (22) echo mode used when echo mode is selected by the engine rpm with a HST pump (11) representing the relation between the input torque of echo mode characteristic line (31) and, when the power mode is selected four mode representing the relation between the engine rpm with a HST pump power mode input torque characteristics line (32) and, engine (17) torque (characteristic line (29)) from working machine pump (13) torque of the engine torque characteristic line obtained work device operation setting value (30) on, echo mode characteristic line (31) and a work device operation engine torque characteristic line (30) it is an intersection with A whip [ching point on, power mode characteristic line (32) and a work device operation engine torque characteristic line (30) B whip [ching point on it is an intersection with, A whip [ching point on engine torque characteristic line whip [ching point B work between operation device (30) with intersection on the whip [ching point C, echo mode characteristics line (31) is set so that a plurality of the, lift arm (4) representing the relation between the input torque rise of the engine rpm with a HST pump operation raised operation characteristic line (34) previously stores in the nanometer range.

In HST pump device and the working device input torque, engine torque characteristic line work device operation (30) matched in intersection on, engine (17) is, in speed and cross with each other. Echo mode characteristic line (31) is, compared to an increase of engine rpm, input torque is set greater than the increasing rate of HST pump, A whip [ching point in the engine rpm, some low rpm N (A) is under or over. , the low speed engine, improves fuel economy can be. Power mode characteristic line (32) is, echo mode characteristic line (31) to cause the input torque is remarkably increased as compared to an increase of engine rpm than HST pump is set so that, in the engine rpm N whip [ching point B (B), (A) N A whip [ching point in engine rpm higher value with each other. To this end, the high speed engine, working machine pump (13) output of carbon dioxide and, lift arm (4) to the driving device (3) and controls the driving can be, capable of workability is improved. Rise operation characteristic line (34) is, echo mode characteristic line (31) from the middle of the first data, until a branch, echo mode characteristic line (31) is connected to the HST pump increased engine revolution rate is large relative to the increased input torque is but, over a branch, for example power mode characteristic line (32) curve almost to HST pump to cause the input torque is remarkably increased as compared to an increase of engine rpm is set so that, in the whip [ching point C (C) N engine rpm, engine rpm greater than N (A), engine rpm is less than a value N (B), engine rpm (B) N proximate its characteristic is set for the corresponding with each other.

In addition, controller (18) is, as also shown 3 work mode selection unit (22) for cancelling echoes in mode is selected in a state in which, working pressure detector (23) device produced in (3) of lift arm (4) judging unit for judging whether or not the rise of operation is detected (26) on, said characteristic is stored to memory unit 5 also of (28) to, is a judging unit (26) in lift arm (4) when determined that the rise in operation is detected, echo mode characteristic line (31) instead, rise in operation characteristic line (34) using HST pump (11) plower number a number control unit (27) with disclosed.

Also 4 as shown, controller (18) is, first a judging unit (26) for identifying whether echo mode is selected as a work mode and gap3. (S1 order). Echo mode is selected is determined to have a, 5 also represented power mode characteristic line (32) along, HST pump (11) would be the number of magnets (S2 order). Echo mode is selected is be used for recording is, working pressure detector (23) detects the pressure inside a lift arm (4) discriminating whether operated rises and gap3. (S3 order). If not detecting pressure working machine set, lift arm (4) is not operated to rise in Figure 5 in which the echo mode indicating characteristic line (31) along the HST pump (11) would be the number of magnets (S4 order). If the control section detects pressure working machine set, lift arm (4) in which the operation characteristics such as rise in Figure 5 operated rises indicating a line (34) along the HST pump number would be the magnets (S5 order).

In addition, in fig. 5, input torque and input torque HST pump 29 has a corresponding internal combustion engine output torque characteristic line and pump working total torque etc.. As described said, engine torque characteristic line work operation device (30) is, working pump input torque engine output torque in corresponding internal combustion engine torque is subtracted (17) relating to the torque characteristic line are disclosed. In Figure 5 is, when accelerating from a stop body echo mode HST pump input torque characteristic line (31) and, power mode characteristic line (32) and, rise in operation characteristic line (34) to a vehicle disclosed. Power mode to whip [ching point B N (B) as shown in an engine rpm high rpm but, as shown in an echo mode to as low rpm engine speed that whip [ching point A N (A) may be discarded at the, working machine pump (13) and method of flow reduced propel other. However, rising operation characteristic line (34) to whip [ching point as shown in C, an improved engine rpm N (C), (A) can be made high speed than N since, echo mode power mode even if close working machine pump (13) discharge flow rate can be achieved.

It also is a form number 1 embodiment, having HST type drive system in, echo mode, work device (3) lift arm (4) is lifted up when performed, controller (18) in a storage portion (28) elevated operation stored in the characteristic line (34) by HST pump (11) is the number so, echo mode can be present in engine speed to increase. Lift arm (4) is lifted up, bucket (5) is applied to seal chamber regardless truck or the like, when composed of acid [...] (saturdays) embodiment with each other. The number 1 embodiment forms, work device (3) is lifted up operation speed can be quickly, capable of working efficiency.

In addition number 1 embodiment forms, rise in operation characteristic line (34) echo mode a characteristic line (31) in amount from the upper face, the upper felt from echo mode while the operator makes a echo mode of lift arm (4) embodiment capable of rise in operation.

[Number 2 embodiment form]

Figure 6 shows a form of the present invention number 2 embodiment also in connection with the number representing the lines also block, with the number 2 embodiment 7 hole controller processing indicates an order in which flow chart form are disclosed. Number 2 embodiment is in the form of the basic configuration in the form number 1 embodiment is equivalent disclosed. In the hereinafter described only for different portions to each other.

Number 2 embodiment forms, HST motor (14) is connected to the, driving wheels system (24) form a part of, HST motor (14) converts the high-speed rotation of the low-stage end either engine not shown multi-stage transmission and, as the transmission speed stage 6 also shown is converted detection speed stage detector (20) on, the wheel loader body is moved forward state detects state of arefrigerant detection sensor (21) with disclosed.

Controller (18) of a judging unit (26) is, in the form of number 1 embodiment addition to, speed stage detector (20) is converted by low end power transmission is detected, in addition forward detection sensor (21) whether or not the wheel loader is moved forward to state detection unit is coated using the same are provided, number control unit (27) is, HST motor number control unit (16) number to the signal is also an input to the edifice.

In one form the number 2 embodiment, as appearing in the flow chart of Figure 7, in order S3 working pressure detector (23) detects the pressure inside a lift arm (4) operation when it is determined to rise, rise in steps S5 order operation characteristic line (34) along the HST pump (11) performed with number of magnets, controller (18) of a judging unit (26) is in low end power transmission to convert, further advancing state is determined when a (S6 order), controller (18) number of control section (27) is, HST motor number control unit (15) number to the outputs, HST motor (14) which is greater than a minimum echo mode the swash plate minimum swash plate minimum number [...] s3. (S8 order) the swash plate. A low stage, either to one of the following conditions when the target is not forward state matches, number control unit (27) is, HST motor (14) a number equal to the swash plate to maintain the swash plate minimum echo mode minimum HST motor control section (15) is etched a number (order S7).

The number 2 embodiment form, the form number 1 embodiment equivalent effect is obtained in addition, work device (3) lift arm (4) is lifted up with, stationary or beautiful custom body ([...]) region when the accelerator, i.e., bucket (5) is applied to seal chamber regardless truck or the like, is composed of acid when [...], echo mode speed lowering of the existing method can be compared.

Wherein, prior art wheel loader in, power mode in work device (3) speed operation speed of workability, and for taking into account the operability since nearly balance, echo mode in the work device (3) lift arm (4) vehicle speed operation of speed and therefore balance, a depression type PMOS transistor as a decrease in working efficiency. I.e., prior art wheel loader, echo mode, work device (3) lift arm (4) the sun gear is rotated relative to the inputted operation of speed, a travel distance is longer tends, in addition, power mode has been echo mode operability in different way. To this end, power mode or a station work can be performed in equal tasks at a portion echo mode, echo mode door travel distance required for power mode and the second present invention work by a machine, work is performed in the gas to be difficult to narrow a work site.

In one form number 2 embodiment, bucket (5) is applied to seal chamber regardless truck or the like, is composed of acid when [...], said HST motor as described (14) since the swash plate to a large minimum speed by the swash plate can be reduced to a minimum, work device (3) lift arm (4) to attain a proper balance of speed and vehicle speed, can be work effectively. In addition, echo mode power mode same work for example bucket (5) regardless to seal such as truck provided to have a blade, and second when a [...] composed of acid, and a travel distance for can be made almost identical.