Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/22—Hydraulic or pneumatic drives
  • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/202—Mechanical transmission, e.g. clutches, gears
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
  • F16H59/02—Selector apparatus
  • F16H59/08—Range selector apparatus
  • F16H2059/088—Fast forward-reverse-sequence mode
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
  • F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
  • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
  • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
  • F16H61/0246—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by initiating reverse gearshift

Definitions

• the present invention relates to an automatic transmission of a wheel loader, and in particular, to an automatic shift down control during excavation.
• a wheel loader is used to excavate the ground with a bucket and load it into a dump truck.
• Fig. 2 shows a series of operation patterns from excavation of a wheel loader to loading on a dump truck, which is the most commonly used operation called V-shape operation. It is a pattern.
• the wheel loader 1 moves forward at a high speed (F 2) toward the ground 2 at the second forward speed (F 2) (driving operation), and approaches the ground 2 (0.5 m to 1.0 m).
• F2 high speed
• F2 first forward speed
• R2 reverse speed
• operation 3 high speed
• High-speed approach (driving operation) Dump truck 3 loading work is completed. When you do so, you leave R3 at high speed from dump truck 3 (driving).
• the present invention has been made in view of the above circumstances, and automatically shifts down during excavation, thereby reducing an operator's operation of a wheel loader.
• the purpose is to provide a device. Disclosure of the invention
• the bottom of the bucket assumes a horizontal position on the ground during the V-sheep operation only when the bucket is pushed into the ground.
• means for detecting that the packet and the packet have reached the predetermined angles, respectively, and both of the boom and the bucket are set to the predetermined angles by these detecting means.
• the speed stage is automatically shifted down to a predetermined low speed stage. As a result, the operation of the operator immediately before the packet is pushed into the ground is reduced.
• the automatic shift-down is released, and the speed gear is automatically returned from the low speed gear to the specified speed gear. I'm trying to make it happen. As a result, the number of operator operations during reverse movement after the excavation is completed is reduced.
• FIG. 1 is a circuit diagram showing one embodiment of the present invention
• FIG. 2 is a diagram used to explain a V-shape operation of a wheel loader
• FIG. 3 is a wheel loader.
• Fig. 4 shows the wheel loader immediately before the bucket is pushed into the ground.
• a direction repeller 7 is a lever for selecting forward F, neutral N, and reverse R
• a range repeller 6 is for forward F or reverse R. This is the lever that selects the gear speed (1st, 2nd, 3rd, 4th)>
• the range lever 6 and the direct lever 7 are collectively referred to as the transmission lever. .
• the transmission selects a total of eight speed stages, ie, four forward speeds and four reverse speeds.
• cancel button ⁇ 0 bucket position detecting sensor ⁇
• boom position detecting sensor 21 AND circuit 313, imperator 414 Or A circuit 17, a flip-flop # 8, and a switching switch 19.
• the cancel button 10 is used to perform a button operation on a platform for canceling the speed change according to the present invention. For example, as shown in FIG. 3, the grip of the boom lever 4 is used. It is arranged. The cancel button 10 applies a normal signal “1”, and when the button is operated, a signal “0” is applied to the AND circuit 13 and the inverter 16.
• the bucket position detection sensor 11 and the boom position detection sensor 12 are respectively provided with a predetermined bucket angle and boom angle preset by the bucket and the boom.
• the specific detection position of the bucket cylinder or the pump cylinder is detected, and a signal-"is output to the AND circuit 1 upon detection.
• This is output using a limit switch, an encoder that detects the rotation angle, etc.
• the limit switch is arranged so that the cylinder is turned on when the cylinder reaches a specific extension position, and when an encoder is used, the cylinder reaches the specific extension position.
• the rotation angle (preset angle) at that time is used as a reference.
• the specific extension positions of the bucket cylinder and the plum cylinder are, for example, as shown in Fig. 4, when the bottom surface of the bucket is in contact with the ground and is in a horizontal position. The position of the cylinder.
• the signal “1" is output to the AND circuit ⁇ 3 when the directory repeller 7 is in the forward F.
• the inverter 14 In addition to the operation of the range lever 6, when the range lever 6 is in the second speed, the signal “ ⁇ ” is output to the AND circuit ⁇ 3 and the inverter 1 when the range hopper 6 is in the second speed. 5 is joining.
• the AND circuit 13 takes the AND condition of the above-mentioned 5 input signals, and when the AND condition is satisfied, the signal “ ⁇ ” is flip-flopped.
• the inverter circuit 7 takes the OR condition of the output of the three inverters 4, 15, and 16, and adds a signal “1” from one of the inverters. Then, the signal "1" is applied to the reset input R of the flip-flop 18.
• the flip-flop 8 is set when the signal “1” is applied to the set input S, and the signal “1” is switched from the output terminal Q of the flip-flop 8. Output, the movable switch ⁇ 9 c of the switching switch 19 is connected to the contact 19 b, and when the signal “1” is applied to the reset input R, the reset is performed. Then, a signal "0" is output from the output terminal Q to the switching switch 19, and the movable contact ⁇ 9c of the switching switch 19 is connected to the contact 19a.
• the driver operates the range lever 6 and the directional hopper 7 in the V-shape operation (see FIG. 2), and travels in the second forward speed.
• the driver appropriately operates the bucket lever in advance so that the bucket cylinder comes to the specific extension position, and outputs a signal "1" from the bucket position detection sensor # 1. Is output.
• the driver operates the boom repeller 4 so that the plum cylinder reaches the specific extension position, and the driver operates the bucket. Ground to the ground.
• the signal “ ⁇ ” is output from the boom position detection sensor 12, and the AND condition of the AND circuit ⁇ 3 is established, and the flip-flop 18 Is set.
• the flip-flop 18 When the flip-flop 18 is set, the movable contact point 19c of the switching switch 19 is switched from the contact 19a to the contact 19b. As a result, even when the range lever 6 selects the second speed, the solenoid S0L2 is deenergized and the solenoid SOL1 is energized, and the speed gear is shifted. It is switched from 2nd gear to 1st gear.
• flip-flop 18 is reset even if the bucket position or boom position changes during excavation. Therefore, the speed is maintained continuously.
• the conditions under which the flip-flop 8 is reset are as follows: when the direction hopper 7 is set to a position other than the forward F, and when the range lever 6 is set to other than the second speed. And Cancel button ⁇ 0 is pressed.
• the wheel loader retreats from the ground 2 at a reverse speed of 2 / speed.
• the directory repo 17 is put into the retreat R, as described above, Flip flop 18 is reset.
• the movable contact ⁇ 9 c of the switching switch 19 is changed from the contact 19 b to the contact 19 a.
• the second speed currently selected by the range lever 6 is selected. That is, conventionally, when reversing after the end of excavation, it was necessary to operate the direction lever 7 and the range lever 6 simultaneously to select the second reverse speed. In the embodiment, it is possible to switch to the second reverse speed by operating only the directory repeller 7.
• the bucket may touch the ground and be horizontal during work other than the V-Sheep operation (such as when leveling the ground). In this case, press the cancel button ⁇ 0 beforehand. However, it is only necessary to prevent automatic shift down.
• the detection bucket position and the boom position in the packet position detection sensor 11 and the boom position detection sensor 12 may be appropriately corrected.
• the two transmission levers namely, the direction lever and the range lever, have been described.
• the invention is applicable.
• an electric transmission control it can be applied to any manual shift car, smart car, and mixed car with both shifts. Noh. Industrial applicability
• the automatic transmission for a wheel loader according to the present invention is useful when applied to a digging and loading operation by a V-shape operation and a normal digging operation.

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• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Operation Control Of Excavators (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=12920604

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (11)

Citations (3)

Family Cites Families (23)

• 1986
  • 1986-04-08 JP JP1986052646U patent/JPH0535183Y2/ja not_active Expired - Lifetime
• 1987
  • 1987-04-07 EP EP87902706A patent/EP0270674B1/en not_active Expired
  • 1987-04-07 US US07/138,844 patent/US4800660A/en not_active Expired - Fee Related
  • 1987-04-07 AU AU72347/87A patent/AU586561B2/en not_active Ceased
  • 1987-04-07 WO PCT/JP1987/000215 patent/WO1987006287A1/ja active IP Right Grant

Patent Citations (3)

Non-Patent Citations (1)

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