JPH0613410Y2 - Lever device for work vehicles - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a lever device in a working vehicle such as a combine, and more specifically, it operates a control lever in the front-back direction along a lever groove to continuously change the speed. The present invention relates to a lever device configured to speed-operate the device and to switch a front / reverse switching gear by tilting laterally in a neutral region.

(B) Conventional technology Recently, in order to suit a small combine, the present applicant has configured the forward / reverse switching gear in the transmission case to be mechanically switched in conjunction with lever operation. A combine combiner has been proposed (see Japanese Patent Application No. 61-311626).

The combine then shifts the front / reverse switching gear to the forward side or the reverse side by tilting the F / R continuously variable transmission lever in the left-right direction in the neutral region of the crank-shaped lever groove, and further continuously variable. Based on tilting the shift lever from that position toward the forward range and the reverse range,
It is configured to extend one actuator to engage the main clutch and speed up the continuously variable transmission.

(C) Problem to be Solved by the Invention However, in the combine proposed by the applicant, the tilt angle of the continuously variable transmission lever is detected by the lever potentiometer, and the detected lever angle is detected. The hydraulic actuator is expanded / contracted to increase / decelerate the continuously variable transmission, and the main clutch is connected / disengaged. The actuator may not operate properly, and there is a risk that the main clutch may not be disengaged even if the actuator is operated in the neutral range and the traveling machine body may continue traveling.

Therefore, the present invention is configured so that when the FR stepless speed change lever is returned to the neutral range, the lever is forcibly returned to its center position and the forward / reverse switching gear is set to a neutral state. Therefore, it is an object of the present invention to provide a lever device that solves the above problems.

(D) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, referring to FIGS. 1 (a) and 1 (b), the neutral of the lever groove (2) is shown. Range (N) to forward range (F), reverse range (R)
The continuously variable transmission is speeded up by operating the operation lever (1) toward, and the operation lever (1) is moved from the center position of the neutral range (N) to the forward range (F) and the reverse range ( A lever device for a working vehicle configured to switch a forward / reverse switching gear based on a lateral operation toward R), wherein the operating lever (1) is neutralized by a biasing means (23). The rolling contact member (27) is urged toward the center position of the zone (N), and further, the rolling contact member (27) installed on the operation lever (1) rolls and supports in the forward movement area (F) and the reverse movement area (R). It is characterized in that guide members (29) and (30) are installed.

Further, a lock arm (33) for locking the operation lever (1) on the reverse range side (F) and / or the reverse range side (R) of the neutral range (N) is installed to operate the operation lever (1). It may be configured to return to the lever release position.

(E) Operation Based on the above configuration, when the operation lever (1) is operated in the forward travel area F (or the reverse travel area R), the operation angle of the lever (1) is detected, and the continuously variable transmission is operated based on this. Acceleration is controlled in accordance with the operation amount of the lever (1), so that the working vehicle accelerates. When the operating lever (1) is operated toward the neutral range (N) to stop the running work vehicle, the lever (1) moves to the neutral range (N) by the urging force of the urging means (23). It is forcibly returned to the central position, and in conjunction with this, the forward / reverse switching gear is forcibly released, so that the traveling system is cut off from its power transmission.
Since the operation lever (1) is operated in a state where the rolling contact member (27) is rollingly contacted with the guide member (29) (or 30), the side portion thereof is not slidably contacted with the lever groove (2). Absent.

When the operation lever (1) is locked to the forward drive range (F) side and / or the reverse drive range (R) side in the neutral range (N) depending on the work situation, it is performed by operating the lock arm (33). When the operation lever (1) is operated again from the locked state, the lock arm (33) returns to the lever release position, so that the operation lever (1) is unlocked.

(F) Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

The F / R continuously variable transmission lever 1 in the combine is shown in Fig. 1.
As shown in (a) and (b), it is inserted through a crank-shaped lever groove 2 formed in a side operation panel 4 near the driver's seat. Further, a pin 5 is attached to the bracket 3 fixed to the traveling machine body so as to be orthogonal to the width direction of the lever groove 2, and a pipe 7 attached to one end of a plate 6 is fitted to the pin 5. ing. Further, one end of the continuously variable transmission lever 1 is installed on one side of the plate 6 via a bracket 9 so as to be rotatable in the longitudinal direction of the traveling machine body, that is, in the direction of arrow A in FIG. Is Fig. 1 (b)
In the forward movement region F and the backward movement region R of the lever groove 2 shown in FIG. 1, the structure can be rotated in the longitudinal direction of the machine body and can be rotated along the neutral area N in the lateral direction of the machine body, that is, in the direction of arrow B in FIG. There is. The arm 1 is attached to the side surface of the pipe 7.
0 and the plate 11 each have one end fixed to both sides so as to project in a V shape, and the other end of the arm 10 has an L-shaped plate 13 having a rod 12 attached to one end.
The other end of the rod is rotatably attached, and the rod 1
A shifter 15 that mechanically switches the forward / reverse switching gear in the transmission case is attached to the tip of the transmission case 2. Further, the rotation angle in the front-rear direction of the F / R continuously variable transmission lever 1 is detected by the lever potentiometer 16. The pin 17 is attached to the frame 17 fixed to the traveling body side.
9 and the pin 20 are installed so as to project toward the plate 11, and the biasing plate 2 of the same shape is attached to the pin 19.
1, 22 are fitted in opposite directions, and a torsion spring 23 allows these plates 21 and 22 to be fitted together.
Are configured to elastically clamp the pin 20.
Further, the pin 25 is erected and fixed to the other end of the plate 11 so as to be inserted into the sandwiching portion of the urging plates 21 and 22. Therefore, when the F / R continuously variable transmission lever 1 is tilted in the left-right direction in the neutral region N, the arm 10 switches between forward and backward movement via the plate 13 and the rod 12, and the plate 11 rotates to urge the plate 21. , 22 is pressed by the pin 25 and the other is elastically abutted against the pin 20, thereby urging the speed change lever 1 to return to the central portion. Then, the urging force is applied to the shift lever 1
Since the gear shift lever 1 continues to operate when the vehicle is operated in the forward drive range F and the reverse drive range R, the shift lever 1 is biased in the forward drive range F in the direction of arrow C in FIG. It is biased in the D direction.

Further, as shown in FIGS. 1 (a) and 2 (a), (b), F
A bracket 26 is fixedly mounted on the R continuously variable transmission lever 1 so as to project to one side in the left-right direction of the machine body, and the bracket 2
A roller 27 is installed on the upper surface of 6 so as to form a predetermined gap with the lever 1. Further, a roller guide 29 is installed along one side of the advance area F of the lever groove 2, and the roller guide 29 is provided between the roller 27 and the lever 1 when the lever 1 is moved to the advance area F. The roller 27 is positioned so as to roll and support the roller 27 which is biased in the direction of the arrow D. Similarly, on one side of the reverse travel region R,
A roller guide 30 is provided for rolling and supporting the roller 27 that is biased in the direction of arrow C when the lever 1 moves along the lever groove 2.

Further, as shown in FIG. 1 (a), a lock arm groove 31 is formed adjacent to the lever groove 2 on the side operation panel 4, and the lock arm groove 31 is rotatable in the machine longitudinal direction. The tip of the installed lock lever 32 is projected, and further, the lock arm 33 is provided at the rotation base of the lever 32.
Are fixed so as to rotate together with the lever 32.
Further, the lock lever 32 is configured to rotate in the direction of arrow E in FIG. 3 to return to the position shown by the solid line in FIG. 3 (a) when it is released due to the balance with the lock arm 33. Move the shift lever 1 to the forward range F, that is, FIG.
Tilt to the position shown by the solid line in (b), and then lock lever 3
When 2 is rotated in the direction of arrow F to release the shift lever 1,
The urging force of the lever 1 causes the plate 6 to lock the lock arm 33.
Is pressed and locked from the side. Thereby, the arm 33
Is held at the position shown by the chain double-dashed line in FIG. 3 (a), and the shift lever 1 is locked to the forward drive range F side. Further, when the gear shift lever 1 is locked in the reverse range R, the same operation is performed.

Since this embodiment has the above-mentioned configuration, for example, F
-When the R continuously variable transmission lever 1 is operated in the reverse range R and the vehicle is traveling in the reverse direction, the continuously variable transmission lever 1 is used to stop the traveling body 3.
When the gear shift lever 1 is operated toward the neutral position N, the speed change lever 1 returns to the neutral region N without rolling the side of the roller 27 to the roller guide 30 and slidingly contacting the edge of the lever groove 2. Then, in the speed change lever 1 that has moved to the neutral region N, the roller 27 has the roller guide 30.
Therefore, it is moved to the center position of the neutral region N by the biasing force of the torsion spring 23. At this time, the forward / reverse switching gear in the mission case is forcibly disengaged by the shifter 15 that rotates via the arm 10 and the rod 12. Therefore, when the F / R continuously variable transmission lever 1 is returned from the reverse range R to the neutral position N, the continuously variable transmission is decelerated and the main clutch is disengaged based on the detection of the operation angle by the lever potentiometer 16. As a result, power transmission to the traveling system is cut off.

When operating the FR stepless speed change lever 1 from the neutral range N toward the forward range F, the lever 1 is moved to the forward range F.
It rotates to the side against the biasing force of the spring 23. Then, the rotation of the arm 10 causes the plate 13 and the rod 12 to rotate.
The shifter 15 is rotated via the, and thereby the front / reverse switching gear is switched to the forward side. Further, when the gear shift lever 1 is rotated in this state toward the speed increasing side of the forward travel region F, the roller guide 26 is inserted between the roller 27 and the lever 1 as shown by the solid line in FIG. In this state, the roller 27 is in rolling contact with the roller guide 29, so that the shift lever 1 is moved without sliding contact with the edge of the lever groove 2.
Then, the lever potentiometer 16 detects the lever operation angle by the movement of the speed change lever 1, and based on this, the hydraulic actuator expands to engage the main clutch and speed up the continuously variable transmission, so that the combine travels forward. To do.

On the other hand, when the continuously variable transmission lever 1 is set to either the forward travel region F side or the reverse travel region R side in the neutral region N during manual handling work, for example, the transmission lever 1 is set to the neutral region N side.
Of the lock lever 32 is rotated to the forward region F side of
In the figure (a), it rotates in the direction of arrow F and further releases the hand from the shift lever 1 to release it. Then, the lock arm 33 rotated to the side of the lever 1 is elastically and abutted from the side by the plate 6 shown by the solid line in FIG. 3 (b), so that the lock arm 33 is rotated. The gear shift lever 1 is held in the moving position and locked to the forward drive range F side. In this state, when the hand switch or the like is operated, the combine starts traveling at a low speed. Further, the work process during the manual handling is performed in the same manner when the vehicle is moving backward.

When it is desired to return the shift lever 1 to the center position of the neutral range N with the end of the manual handling work, the forward range F
Alternatively, the lever 1 locked in the reverse drive range R is slightly tilted in the direction against the biasing force. Then, the lock arm 33
Is released and is rotated by its own weight to the position indicated by the solid line in Fig. 3 (a).
Because of the return, the shift lever 1 is immediately unlocked. In addition, the forward range F of the gear shift lever 1 (or the reverse range R)
When the operator wants to increase the speed as it is from the locked state on the side), the operator can move the continuously variable lever 1 as it is in the forward range F.
It is sufficient to perform the speed increasing operation in (or the reverse range R), whereby the speed change lever 1 can be naturally disengaged from the lock arm 33 and moved to the speed increasing side. Therefore, it is possible to prevent forgetting to release the locked state of the continuously variable transmission lever 1.

(G) Effect of the Invention As described above, according to the present invention, the operation lever (1) is urged toward the center position of the neutral region (N), and the rolling contact member (27) is moved to the guide member ( 29),
Since it is configured to roll and support by means of (30), the power transmission to the traveling system is surely cut off only by operating the operation lever (1) to the neutral region (N), and the traveling machine body is against the operator's intention. It is possible to prevent troubles such as traveling, and further, when operating in the forward range (F) and the reverse range (R), it is possible to operate smoothly without rattling, thus operating with safety. The property can also be improved.

Furthermore, since the lock arm (33) is configured to return to the lever release position when the operation lever (1) is operated,
It is possible to easily remove the arm (33) and release the locked state by simply operating the operation lever (1) lightly, so that the operability can be improved.

[Brief description of drawings]

1 (a) is a perspective view of a lever device according to the present invention, FIG.
2 (b) is a plan view showing the lever groove, FIG. 2 (a) is a plan view showing movement of the speed change lever in the lever groove, FIG. 2 (b)
Is a side view thereof. FIG. 3 (a) is a front view showing the time when the shift lever is locked / unlocked by the lock arm,
FIG. 3 (b) is a side view thereof. DESCRIPTION OF SYMBOLS 1 ... Operation lever (FR stepless speed change lever), 2 ... Lever groove, 23 ... Energizing means (torsion spring), 27 ... Rolling contact member (roller), 29, 30 ... Guide member (roller guide), 33 … Lock arm, F… forward range, N… neutral range, R… reverse range.

Claims (2)

[Scope of utility model registration request] 1. A continuously variable transmission is speeded up by operating an operating lever from a neutral region of a lever groove toward a forward region and a backward region, and the operating lever is moved forward from a center position of the neutral region. A lever device in a work vehicle configured to switch a forward / reverse switching gear based on a lateral operation toward a reverse region, wherein the operating lever is moved to a central position in a neutral region by a biasing means. A lever device for a work vehicle, characterized in that a guide member for urging the rolling contact member installed on the operation lever is provided for rolling and supporting the rolling contact member in a forward drive region and a reverse drive region. 2. A lock arm for locking the operation lever on the forward travel side and / or the reverse travel side of the neutral range is provided, and the lock arm is configured to return to the lever release position when the operation lever is operated. The lever device for a work vehicle according to claim 1.