JPH02212247A - Brake device for agricultural machine - Google Patents

Abstract

PURPOSE:To prevent the generation of an unpleasant shock at the time of changing a moving direction by forming a turnout to where a change lever is shunted from a passage change lever is passed when the change lever is operated to a forward area and a rearward area and operating a neutral brake at the time of detecting that the change lever is shunted to the turnout. CONSTITUTION:A lever guide groove 26 for guiding a main change lever 9 formed at an operation panel 25 is formed along the fore and rear direction of a body for a forward area F and a rearward area R, a step portion 26a is formed at the front portion of the forward area F and a step portion 26b is formed at a connecting portion between both the areas F, R, i.e., a neutral position N respectively. In this case, moreover, a turnout 26c is formed opposite to the step portion 26b of the neutral position N and a switch 27 for detecting the lever, is provided at the turnout 26c, which is turned on when the main change lever 26 in the neutral position N is inclined in a left and right direction to be engaged with the turnout 26c. When said switch 27 is turned on, a neutral brake is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake device for a mobile agricultural machine such as a tractor, and more specifically, the present invention relates to a brake device for a mobile agricultural machine such as a tractor. The present invention relates to a brake device for a mobile agricultural machine having a transmission configured to.

(0) Prior Art Conventionally, mobile agricultural machines, such as tractors, change gears by operating a main shift lever installed in the driver's seat to change the gears in the transmission.

In order to improve operability and meet the needs of the times, the system was constructed so that multiple hydraulic clutches could be connected and disconnected as appropriate through valve operation using solenoids, allowing for multi-speed shifting in accordance with the operation of the main shift lever. A transmission has been devised.

(C) Problem to be Solved by the Invention By the way, in the transmission device, when the main shift lever is operated to the neutral position, each of the hydraulic clutches is engaged or released as appropriate to release the output shaft, thereby returning to the neutral state. However, in the neutral state, the hydraulic clutch causes rotation, making it difficult to stop the traveling aircraft unless the brake pedal is kept depressed, making it difficult to operate. is becoming troublesome. Furthermore, if the brake pedal is depressed at the wrong timing when operating the main shift lever into neutral on a slope, for example, there is a risk that the aircraft may slide backwards or other inconveniences.

Therefore, the present invention provides a brake system for a mobile agricultural machine that solves the above-mentioned problem by configuring the main shift lever to brake and operate the neutral brake by operating the main shift lever from the neutral position to the retracting position. The purpose is to provide

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, when shown with reference to FIGS. ), (57) (59), (60),
(61), (62), (63), (65), and a speed change lever (9), and the speed change lever (9) is connected to the forward range (F) or reverse range (R) of the lever guide groove (26). A transmission device (132) configured to appropriately engage or disengage the engaging means based on a rotational operation of the transmission lever (9), and to change gears in accordance with the rotational operation position of the transmission lever (9). A mobile agricultural machine (1) (see FIG. 6) comprising: a neutral brake (50) that appropriately locks an interlocking member (39) that interlocks with an output member of the transmission (132) at least in neutral; A recess located at the neutral position (N) in the lever guide groove (26) and retracted from the passage through which the shift lever (9) is operated to the forward range (F) and reverse range (R). Department (26
c), a lever detecting means (27) for detecting that the shift lever (9) has retreated to the retracting portion (26C), and a lever detecting means (27) detecting that the shift lever (9) has moved to the retracting portion of the shift lever (9); The present invention is characterized in that a brake operating means (44) is provided for braking and operating the neutral brake (50) based on the detection signal when the retraction of the vehicle is detected.

(e) Effect Based on the above configuration, shift the gear lever (9) to the forward range (F) (
or backward range (R)), a signal based on the operation causes the corresponding engagement means to be engaged or released as appropriate, thereby causing the gear shift lever (9) to move forward (or backward) according to the operating position. Reverse) rotation is obtained.

Further, when the gear shift lever (9) is returned to the neutral position (N) and is further operated to the retracting portion (26C) of the position (N), the lever detection means (27) detects that the lever (9) is in the retracting portion. (26c), an actuation signal is output from the brake actuation means (44) based on the detection signal, and based on this, an actuation signal is output from the brake actuation means (44).
) brakes and operates. As a result, the interlocking member (39) is locked and the output member, that is, the wheels (3) are locked, so that the mobile agricultural machine (1) is stopped and maintained in that state.

Note that the numbers in parentheses are used to refer to the drawings, but they do not limit equivalent configurations, and even if the numbers are the same, they are described based on the scope of the claims, so they are described below. The name may be different from the name of the example shown.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 6, the tractor 1 has front wheels 2 and rear wheels 3.
The vehicle has a traveling body 5 supported by an engine, an engine is mounted in the front part of the traveling body 5, and a driver's seat 6 is disposed in the rear part thereof. A driver's seat 7 and a main gear shift lever 9 are provided.

In addition, the main shift lever 9 is shown in FIGS. 3(a) and 3(b).
.

As shown in (C), it is installed on a shaft 12 installed on a support member 11 fixed to the fuselage frame 10 so as to be rotatable in the longitudinal direction of the fuselage, and the vicinity of the rotational base in the longitudinal direction is connected with a fulcrum bolt 13. The lever 9 is supported so as to be rotatable in the left and right directions of the body, and therefore the lever 9 is configured to be rotatable in the front and rear directions and the left and right directions of the body. Further, a plate 15° position plate 16 is installed below the shaft 12, and a lever position detection potentiometer 17 is installed on the plate 15. Further, a rotating arm 19 is installed at the rotating base of the main shift lever 9 on the opposite side of the shaft 12, and a pin member 20 is attached to the tip of the rotating arm 19 on the potentiometer 17 side. It is installed protruding towards the One end of the pin member 20 passes through the rotating arm 19, and a ball 22 biased outward by a spring, that is, toward the position plate 16, is housed in a hollow portion 20a formed at the one end. death)
Furthermore, positioning recesses 16a are formed in the J position plate 16 along the rotation locus of the balls 22, and the balls 22 slide and engage with the recesses 16a. This allows the main shift lever 9 to be positioned at any rotational position. on the other hand,
A swinging arm 23 has one end fixed to the rotation shaft 17a of the potency B meter 17, and a notch is formed at the other end of the swinging arm 23, and the pin member is inserted into the notch. 20 is inserted, and therefore, the rotational movement of the main shift lever 9 is transmitted to the rotation shaft 17a via the rotation arm 19, the pin member 2o, and the swing arm 23, whereby the potentiometer 17 is It is configured to be able to output a voltage value according to the tilt angle of the speed change lever 9.

Further, a lever guide groove 26 for guiding the main shift lever 9 is formed in the operation panel 25, and the lever guide groove 26 is formed along the longitudinal direction of the aircraft, and is formed in a forward region F and a reverse region R. is formed. Further, a stepped portion 26a is formed at the front of the forward movement region F, and a step portion 26b is formed at the connecting portion between the forward movement region F and the reverse movement region R, that is, the neutral position N. A retraction portion 26c is provided on the side opposite to the stepped portion 26b at position N.
is formed.

Further, lever portions 9b, 9b fixed to the lever 9 are located near the pivot base in the left and right direction of the shift lever 9, and the positioning member 1
The aircraft is designed to rotate in the left and right direction with respect to 8.
And above the gap between the lever members 9b, 9b is a hollow portion 9a.
is formed.

The ball member 14, which is biased by the spring 8 inserted into the hollow part 9a, is pressed into contact with and engaged with a plurality of positioning recesses formed in the upper part of the positioning member 18, so that the main shift When the lever 9 is tilted in the left-right direction, the ball member 14 engages with the recess, so that the lever 9 is positioned at the positions A22 and B shown in FIG. 3(a). . In addition, the retraction section 2
A lever detection switch 27 is installed at 6c,
The switch 27 is turned on (or off) when the main shift lever 9 tilts in the left-right direction in the neutral position N and engages with the retracting portion 26c, and outputs a lever detection signal to a microcomputer 130, which will be described later.

On the other hand, as shown in FIG. 2, the transmission 132 has a gear 31 installed on a shaft 30 connected to the engine, and the gear 31 is connected to a large diameter gear 33 installed on the shaft 32.
It meshes with a large-diameter gear 37 provided at one end of a sleeve shaft 36 provided coaxially with the shaft 35 via.

Further, sleeve shafts 39 and 40 are rotatably fitted on the shaft 35, similar to the sleeve shaft 36, and a gear 41 is rotatably installed on the sleeve shaft 36, and small diameter gears 42 and 43 are rotatably fitted on the shaft 35. , large diameter gears 45, 46 are installed. Furthermore, a large diameter gear 47 and a small diameter gear 49 are installed on the sleeve shaft 39, and a friction plate 51 constituting a neutral brake 50 is installed.
0, large diameter gears 52, 53 and small diameter gears 55 are installed. Further, hydraulic clutches 56, 57, 59, 60 for main transmission are arranged adjacent to the sleeve shaft 36, and hydraulic clutches 61, 62, 63, 65 for auxiliary transmission are arranged adjacent to the sleeve shaft 39. has been done. Further, a small diameter gear 67 is installed on a clutch shaft 66 provided in the hydraulic clutch 56, 57, and a large diameter gear 69 connected to the friction plate of the clutch 56 is rotatably installed and meshes with the gear 42. A small diameter gear 70 connected to the friction plate of the hydraulic clutch 57 is rotatably installed and meshes with the gear 43. Furthermore, a small diameter gear 72 connected to the friction plate of the clutch 61 is rotatably installed on a clutch shaft 71 provided in the hydraulic clutch 61, 62, and meshes with the gear 47. A connected large-diameter gear 73 is rotatably installed and meshes with the gear 49.

On the other hand, a large diameter gear 76 is installed on the clutch shaft 75 of the hydraulic clutch 59.
A gear 77 connected to the friction plate of the clutch 60 is rotatably installed and meshed with the gear 45, and a gear 79 connected to the friction plate of the clutch 60 is rotatably installed and meshed with the large diameter gear 46. . Also, the clutch shaft 75 has a gear 8.
0 is installed, and the gear 80 is connected to the hydraulic clutch 6.
The clutch shaft 82 is connected to the friction plate 3 of the hydraulic clutch 65 and meshes with the large diameter gear 47. Furthermore, the clutch shaft 82 has a large diameter gear 83 rotatably connected to the friction plate of the hydraulic clutch 65. It meshes with 49. A small diameter gear 85 is installed at the tip of the clutch shaft 82 and meshes with the gear 53, and a large diameter gear 86 is rotatably installed and meshes with the gear 52.

A large diameter gear 87.8 is attached to the tip of the shaft 35.
9 and small diameter gears 90 and 91 are installed respectively,
These gears 87, 89, 90.91 mesh with gears 93.95, 96.97, which are rotatably installed on the PTO shaft 92, respectively.

Therefore, the chic 99 installed on the shaft 92 so as to be able to slide freely
, 100 to appropriately engage the gears 93, 95, 96, 97, the torque of the PTO shaft 92 can be freely changed. Furthermore, a large-diameter gear 101 that meshes with the gear 55 is installed at the tip of the clutch shaft 71, and a bevel gear 102 is also installed. The bevel gear 102 is connected to a bevel gear 105 installed on the shaft 103. Rear axle 10 via small diameter gear 104
The rotation is transmitted to a large-diameter gear 107 provided at 6, thereby driving the rear wheels 3. Further, a friction plate 109 is connected to the shaft 30, and a sleeve gear 111 is connected to the case 108, which together with the friction plate 109 constitute a main clutch 110. Furthermore, the sleeve gear 111
is a gear 112 rotatably installed on the shaft 32;
A large diameter gear 113 installed on the shaft 35 via
It meshes with the Further, the rotation of the large diameter gear 86 is transmitted to the front wheels via a large diameter gear 117 connected to a front wheel drive clutch 118. Note that 115 is an independent PTO clutch.

Further, the gear shift operation based on the hydraulic circuit and the operation of each element will be explained with reference to FIGS. 4 and 5.

The hydraulic circuit of the tractor 1 includes a hydraulic pump P, two-position switching valves 116, 119, 123, 125, 126, 127,
It has a 129.4 position switching valve 117°, 121.122 and a modulator valve 124, and oil passages a and b.
Main transmission hydraulic clutches 56, 57 each operated by hydraulic pressure pumped through oil passages c, d, main transmission hydraulic clutches 59, 80, oil passages e, f, respectively actuated by hydraulic pressure pumped through oil passages c, d. The sub-transmission hydraulic clutches 61 and 62 are actuated by the hydraulic pressure fed through the oil passages g and h, and the sub-transmission hydraulic clutches 63 and 65 are actuated by the oil pressure fed through the oil passages g and h, respectively. Further, the modulator valve 124 gradually increases the pressure of the boost oil passage A in order to smoothly connect each of the hydraulic clutches, and the two-position switching valve 116
The modulator valve 124 switches the boost oil passage A when it reaches a predetermined oil pressure, and sends the entire hydraulic pressure of the boost oil passage A to the hydraulic clutch side.

When the main shift lever 9 is engaged with the retracting portion 26c at the neutral position N, the switching valves 123, 125° 126 .127 each solenoid is not energized and the switching valve 129
Only the solenoid 129a is energized, thereby switching the switching valve 129 and applying hydraulic pressure to the switching valve 117 via the oil path 1. Therefore, the switching valve 117 is switched and hydraulic pressure acts on the neutral brake 50, The brake 50 brakes and operates.

Further, in the first forward speed state (Fl), the switching valve 129
The solenoid 129a is demagnetized, so that the hydraulic pressure acting through the oil path engages the auxiliary transmission hydraulic clutch 65, and the hydraulic pressure acting through the oil path a engages the main transmission hydraulic clutch 56. .

Further, in the second forward speed state (F2), only the solenoid 123a of the switching valve 123 is energized, and therefore oil pressure acts on the switching valve 119 via the oil passage j, thereby switching the switching valve 119 and opening the oil passage. The main transmission hydraulic clutch 57 is engaged through the oil path, and the sub transmission hydraulic clutch 65 is engaged by the hydraulic pressure acting through the oil path.

Thereafter, in the same manner, each solenoid is energized or demagnetized as shown in Fig. 5, and based on this, each solenoid moves forward 1
speed (Fl) to 12th speed (Fl2) and reverse 1st speed (R1
), a 4th reverse speed (R4) is obtained.

On the other hand, as shown in FIG. 1, a microcomputer 130 (hereinafter referred to as microcomputer) mounted on the tractor 1 has a lever detection switch 27, a lever position detection potentiometer 17, and a lift arm position detection potentiometer 131 on its input board. The switching valves 123, 125, 126, 127 are connected and on the output side.
, 129 respective solenoids 123a, 125a, 1
26a, 127a, and 129a are connected.

The microcomputer 130 is provided with a brake actuation means 44, and the brake actuation means 44 receives a signal when the lever detection switch 27 detects engagement of the main shift lever 9 with the retracted portion 26c. Based on the signal, the solenoids 123a, 1'25a, 126a, and 127a are demagnetized and an activation signal is output to the solenoid 129a. As a result, the solenoid 129a is energized, the switching valves 129 and 117 are switched, and the neutral brake 50 is braked and operated by the action of hydraulic pressure.

Furthermore, when the main shift lever 9 is not in the neutral position N and the lever detection switch 27 is not detecting the lever 9, the engine is configured so that it will not start even if the key switch is operated. Therefore, problems such as the engine starting and the aircraft flying out when the main shift lever 9 is at a shift position other than the neutral position N are prevented from occurring.

Since the present embodiment has the above-described configuration, when the operator operates the main shift lever 9 from the neutral position 1jN to the first forward speed (Fl) while the engine is running, the lever 9 or the retracted portion 26c Then, the lever is removed from the neutral position N, and the lever detection switch 27 is turned off. Based on this, the solenoid 129a is demagnetized, and the switching of the switching valve 129 cuts off the hydraulic pressure to the switching valve 117, thereby switching the switching valve 117 and releasing the neutral brake 50. And lever 9
is operated to the F1 position of the lever guide 26, thereby causing the rotational movement of the lever 9 to move from the rotation arm 19 to the bin member 20. The voltage is transmitted to the rotation shaft 17a via the swing arm 23, and thereby the potentiometer 7 outputs a voltage value corresponding to the lever rotation angle. Then, based on the voltage value, all solenoids 123a, 125a, 126a, 127
a, 129a are demagnetized, and therefore hydraulic pressure is sent to the main transmission hydraulic clutch 56 through the oil path a and to the auxiliary transmission hydraulic clutch 65 through the oil path, and these clutches 56 and 65 are engaged. Ru. Therefore, the rotation of the engine is transmitted from the shaft 30 to the sleeve shaft 36 via the gears 31, 33, 37, and further to the clutch shaft 66 via the gears 42, 69 and the main transmission hydraulic clutch 56. And gear 67.41, 76°80.4
7,49,83. The rotation is transmitted to the gear 85 via the auxiliary transmission hydraulic clutch 65, and the rotation is transmitted to the rear wheels 3 via the gears 53, 55, 101, etc., so that rotation in the first forward speed is obtained. Also, at this time, the front wheel drive clutch 1 is attached to the front wheel side.
18, engine rotation is transmitted via gears 52, 86, 117, etc.

Further, for example, when the main shift lever 9 or R5 is tilted, the voltage value corresponding to the tilting is changed to the potentiometer 17.
Based on the output from the solenoids 126a, 12
7a is excited, and the auxiliary transmission hydraulic clutch 63 is engaged via the oil passage g, and the main transmission hydraulic clutch 56 is engaged via the oil passage a. Therefore, similar to the case of R1 mentioned above,
Engine rotation is transmitted from the shaft 30 to the main transmission hydraulic clutch 56 via gears 31, 33, etc., and further via the shaft 66, gear 67, etc. to the auxiliary transmission hydraulic clutch 6.
3, and is transmitted to the rear wheels 3 via gears 86, 55, 101, etc., thus obtaining five forward rotation speeds.

On the other hand, when the main shift lever 9 is operated to the reverse range R, for example R1, a voltage value corresponding to the tilt angle of the lever 9 is output from the potentiometer 17, and the solenoid 126a of the switching valve 126 is excited based on this. be done. As a result, the switching valve 122 is switched and hydraulic pressure acts on the auxiliary transmission hydraulic clutch 62 through the oil path f, causing the clutch 62 to engage, and the clutch 56 is also engaged due to the oil pressure acting through the oil path a. match. Therefore, the rotation of the engine is controlled by the main transmission hydraulic clutch 56. The rotation is transmitted to the rear wheels 3 via the auxiliary transmission hydraulic clutch 62 and the like, so that rotation in the first reverse speed is obtained.

In addition, the main shift lever 9 is moved to the retracted portion 2 at the neutral position N.
6c, the lever detection switch 27 is turned on. Based on this, solenoids 123a and 125a
, 126a, 127a are demagnetized and the switching valve 12
A signal is output to the solenoid 129a of 9, the solenoid 129a is energized, the switching valve 129 is switched and hydraulic pressure acts on the oil passage I, so the switching valve 117 is switched, and the hydraulic pressure acts on the neutral brake 50. Accordingly, the brake 50 is braked and operated. Therefore, it is possible to prevent a problem in which the clutch does not come to a complete stop when the clutch is in neutral.

When the main shift lever 9 is operated, the lever detection switch 27 will not turn on just because the lever 9 is operated to the neutral position N, but when it engages with the retraction portion 26C at the neutral position 15iN. Since the lever detection switch 27 is turned on only when the main shift lever 9 located in the reverse range R is operated toward the forward range F, or vice versa, the main shift lever 9 located in the forward range F is operated towards the reverse range R. When the main shift lever 9 passes through the neutral position N, the neutral brake 5 is
No problems such as shocks caused by braking or activation of 0 will occur.

(G) As described in detail, according to the present invention, the lever detection means (
27), the neutral brake (5o) is configured to brake and operate based on the signal that detects that the gear shift lever (9) is engaged with the retraction portion (26c), so it has a simple configuration. However, when the gear shift lever (9) is operated in neutral, the neutral brake (5o) can be easily braked and activated, and the engagement means, such as the hydraulic clutch (
56), (57), (59), (60), (61), (
62), (63), (65), etc. can reliably prevent the aircraft from starting to move, and even when performing neutral operation on a slope, the neutral brake (5o) can be braked and activated immediately. I can do it,
This makes it possible to reliably prevent inconveniences such as the aircraft body sliding down due to incorrect timing of pressing the pedal brake. Then, by engaging the gear shift lever (9) with the retraction part (26C), the neutral brake (50) is braked and activated, so the aircraft that is moving forward can be switched to reverse, or the aircraft can be moved backward. Even when the gear shift lever (9) passes through the neutral position (N) in order to switch the aircraft forward, the neutral brake (50) is not braked or activated each time. It is possible to reliably prevent problems that cause unpleasant shocks.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an electric circuit according to the present invention, FIG. 2 is a schematic diagram showing an outline of the transmission, and FIG. 3 is a diagram showing the main gear shift lever. (a) is a front view as seen from the front of the aircraft. FIG. 3(b) is a side view thereof, and (C) is a plan view showing the lever guide groove thereof. Furthermore, FIG. 4 is a diagram showing the hydraulic circuit, FIG. 5 is a diagram showing the operation of each element at each position, and each figure is a perspective view showing the entire tractor to which the present invention can be applied. - (Main gear shift lever) 26... Lever guide groove
26c... Evacuation part 27... Lever detection means (lever detection switch) 50... Neutral brake 56, 57, 59. 60, 61, 6
2,63,65. ...Engagement means (hydraulic clutch for main transmission, hydraulic clutch for auxiliary transmission), F'...Forward range N
...Neutral position R...Reverse range

Claims (1)

[Scope of Claims] 1. It has a large number of engagement means such as clutches, and a speed change lever, and the said engagement means is based on rotating the speed change lever in the forward movement region or the reverse movement region of the lever guide groove. A mobile agricultural machine comprising a transmission configured to engage or disengage as appropriate to change speed in accordance with the rotational operation position of the transmission lever, the mobile agricultural machine being interlocked with an output member of the transmission at least in neutral. a neutral brake that appropriately locks the interlocking member; and a retracting portion located at a neutral position in the lever guide groove and retracted from a passage through which the shift lever is operated to the forward range and the reverse range. , lever detection means for detecting that the shift lever has retreated to the retreat section; and when the lever detection means detects that the shift lever has retreated to the retreat section, braking/braking the neutral brake based on the detection signal. A brake device for a mobile agricultural machine, characterized in that it is provided with a brake operating means that operates.