JPH069938B2 - Farm vehicle clutch structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to install a disc type friction clutch in a mission case in a state of being disengaged and being operated by a machine floor operating mechanism. The present invention relates to a clutch structure for an agricultural work vehicle provided with a charge spring for operating force with a clutch.

[Conventional technology]

In the above agricultural work vehicle, a charge spring is conventionally provided outside the mission case as proposed in Japanese Utility Model Application No. 61-93679.

[Problems to be solved by the invention]

There was a risk that the mud that had jumped up as the aircraft progressed adheres to the charge spring, and the charge spug may rust early.

An object of the present invention is to allow a charge spring to be installed in a mission case while suppressing an increase in the size of the mission case.

[Means for solving problems]

A characteristic configuration of the present invention is that, in the clutch structure of the agricultural work vehicle described above, the spindle of the operating sliding shifter of the friction clutch is slidably attached to each of the operating sliding shifter and the mission case, and A spring receiving portion is provided on the support shaft in a state of being interlocked with a mechanical operating mechanism and slidably fitted into one end side of a boss portion of the operating slide shifter, and the charge spring is provided on the boss portion. The boss is internally mounted in a state of being interposed between the other end side and the spring receiving portion, and the operation and effect thereof are as follows.

[Work]

That is, as the friction clutch is engaged,
The support shaft is slid to operate the operating slide shifter via the charge spring, and the charge spring is elastically deformed to bias the operating slide shifter to the clutch engagement side. Therefore, even if the charge spring is installed in the boss portion of the operating slide shifter, the original purpose thereof is achieved.

〔The invention's effect〕

Therefore, since the charge spring can be fitted into the boss portion of the sliding shifter, the supporting shaft can be made shorter than that in the case where the charge spring is arranged outside the sliding shifter. It became possible. Furthermore, the charge spring can be installed inside the mission case, and the rusting of the charge spring can be avoided and its function can be secured for a long time.

〔Example〕

As shown in FIG. 6, a pair of right and left steering type front drive wheels (1),
(1) and a non-steering type rear wheel (2), a rear part of the traveling machine body having (2), a lift arm (3) for connecting a song type working device such as a rotary tiller such that it can be lifted and lowered, and An agricultural tractor is configured by providing a power take-off shaft (4) that is transmitted to the connecting work device.

As shown in FIG. 2, the front wheel transmission case (5) as a mission case is attached to the traveling machine body so as to be vertically swingable around the longitudinal axis (X) of the machine body regardless of the inclination of the ground plane. Is designed to be maintained in a substantially horizontal position.

Explaining the drive structure of the front wheels (1), (1), the front wheel transmission case (5) is arranged in the first case portion (5A) on the right side of the first case portion (5A). Differential mechanism
(6), a pair of left and right laterally interlocking shafts (8), (8) interlocked with the pair of left and right output gears (7), (7) of the differential mechanism (6) are respectively installed, Bevel gear mechanism (9) on the interlocking shaft (8)
The longitudinal interlocking shaft (10) that is interlocked via the is installed in the second case part (5B) connected to the left and right ends of the first case part (5A), so that the running transmission (11) When the output is transmitted to the input shaft (12), it is transmitted to the differential mechanism (6) via the bevel gear mechanism (13), and the axle (8) via the horizontal interlocking shaft (8) and the vertical interlocking shaft (10). 14).

Differential gear case (15) of the differential mechanism (6)
And a bevel gear mechanism (13) between the bevel gear mechanism (13) and a standard speed transmission gear (17) having a clutch pawl portion (17a). Mechanism (1
The spline is externally fitted to the sleeve (18) to which the output from 3) is transmitted, and is interlocked with the gear (19) that meshes with the standard speed transmission gear (17) via the rotary shaft (20) and the gear (21). Speed-up transmission gear with disc type multi-disc friction clutch (22)
(23) is loosely fitted in the differential gear case (15),
The transmission member (25), which also serves as a transmission, is attached to the interlocking shaft (8) on the left side through the sleeve (24) so as to be integrally rotatable and slidable, so that the shift member (25) is slid by the shifter (26) described later. It is configured so that the speed can be changed by a dynamic operation. That is, when the shifter (26) is operated to the first operation position (S) shown in FIG. 1, the speed change member (25) forms a clutch claw (25a) which can be engaged and disengaged with the clutch claw (17a). The standard peripheral speed transmission gear (17) is rotatably engaged with the pair of front wheels (1) and (1) so that the average peripheral speed is equal to or equal to the average peripheral speed of the pair of rear wheels (2) and (2). It is in the first state in which it is transmitted to the front wheel differential mechanism (6) so as to be substantially the same. Then, when the shifter (26) is operated to the second operation position (H) shown in FIG. 1, the speed change member (25) operates the operation part (25b) to operate the friction clutch (22) to increase the increase. The high speed transmission gear (23) is rotated integrally with the pair of front wheels (1),
The second state is set in which the average peripheral velocity of (1) is transmitted to the front wheel differential mechanism (6) so as to be higher than the average peripheral velocity of the pair of rear wheels (2), (2).

As shown in FIG. 1, the support shaft (27) of the operating sliding shifter (26) of the friction clutch (22) is connected to the operating sliding shifter (2).
6) and the front wheel transmission case (5) are slidably supported on the front wheel transmission case (5), and the shifter support shaft (27) supports the shifter (26) by a spring (28). Externally fit the friction clutch (22) while biasing it to the cut side,
A spring receiving part (29) is externally fitted and fixed to the shifter support shaft (27) via a pin (30) while being slidably fitted in one end side of a boss part (26A) of the shifter (26). At the same time, attach the charge spring (31) for operating the clutch to the boss (2
6A) is housed in the boss portion (26A) while being interposed between the other end side and the spring receiving portion (29), so that the shifter support shaft (27) is supported by the cam mechanism (A) described later. Spring (2
When the sliding operation is performed against the biasing force of 8), the shifter (26) is operated via the charge spring (31), and the shift member (25) is slid. .

As shown in FIG. 4, the pitman arm (34) protruding to one side of the steering gear case (33) of the steering handle (32) and the knuckle arm (35) of the front wheels (1), (1), (35)
One of them (35) is interlocked with a link (36), and the knuckle arms (35) and (35) are connected to each other by a tie rod (3).
7) interlocking connection, so that the steering handle (3
The front wheels (1) and (1) can be steered by rotating 2).

As shown in FIGS. 1, 3, and 5, one knuckle arm (35) and a swing arm (35) fixed to the cam shaft (38) protruding from the front wheel transmission case (5) ( 39) is pivotally connected with an interlocking rod (40), a cam plate (41) is attached to the cam shaft (38), and the shifter support shaft (27) is attached in the cam groove (41a) of the cam plate (41). The actuating pin (42) is spline-fitted so that it is positioned to form a cam mechanism (A) as a mechanical operation mechanism that is interlocked with the shifter support shaft (27).
As shown in Fig. 3, the left and right set swing ranges with the neutral position (N) where the front wheel (1) goes straight as the middle point
If there is a knuckle arm (35) in (L), (L), the cam plate (41) does not act on the operating pin (42), and the shifter (26) is urged by the spring (28). It is maintained at the first operation position (S), and as shown in FIG.
When the knuckle arm (35) swings to the left or right over (L) and (L), the operating pin (42) is contacted with both ends (41A) or (41B) of the cam groove (41a), As shown in Fig. 5, the cam groove (41
The shifter supporting shaft (27) is slid to move away from (a), and the shifter (26) is switched from the neutral position (N) to the second operating position (H). That is, when the steering angle of the front wheels (1), (1) is less than the set angle, the operating pin (42) is in the cam groove (41a) and the transmission (16) is When the steering wheel is in the first state and the steering angle of the front wheels (1), (1) is equal to or greater than the set angle, the operating pin (42)
Is moved to the side away from the cam groove (41a) and the transmission (16)
Automatically switches to the second state so that the vehicle body can turn in a smaller radius than when the front wheels are driven with the transmission (25) in the first state.

[Another embodiment]

Although the friction clutch (22) is automatically turned on and off by the cam mechanism which is interlocked with the steering handle (32) in the above embodiment, it may be manually turned on and off by a switch or the like.

The present invention can be applied not only to agricultural tractors but also to various agricultural work vehicles such as rice transplanters.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a clutch structure for an agricultural work vehicle according to the present invention. FIG. 1 is a partially cutaway sectional view showing a mounting portion of a charge spring, and FIG. 2 is a partially developed state of a front wheel transmission structure. FIG. 3 is a plan view showing a mounting portion of a knuckle arm, FIG. 4 is a partially cutaway side view showing linkage between a handle and a knuckle arm, and FIG. FIG. 6 is a plan view showing an operating state, and FIG. 6 is a side view of the agricultural tractor. (5) …… Mission case, (22) …… Frictional clutch, (2
6) …… Sliding shifter for operation, (26A) …… Boss part, (27)…
… Spindle, (29) …… Spring receiving part, (31) …… Charge spring, (A) …… Mechanical operation mechanism.

Claims (1)

[Claims] 1. A transmission case (5) is mounted in a state in which a disc type friction clutch (22) is disengaged and urged and is operated by a mechanical operation mechanism (A).
A clutch structure for an agricultural vehicle equipped with a charge spring (31) for operating the clutch, the friction clutch (2
2) The supporting shaft (27) of the operating sliding shifter (26) is slidably attached to the operating sliding shifter (26) and the transmission case (5), and the mechanical operating mechanism is also installed.
The boss part of the operation sliding shifter (26) linked with (A)
The support shaft (27) is provided with a spring receiving portion (29) slidably fitted in one end side of (26A), and the charge spring (31) is provided at the other end of the boss portion (26A). A clutch structure for an agricultural work vehicle which is internally provided in the boss portion (26A) in a state of being interposed between a side and the spring receiving portion (29).