JPS62209227A - Actuating structure for mechanical friction clutch - Google Patents

Abstract

PURPOSE:To make it possible to reduce the burden for clutch operation, by receiving a reaction force acting upon a shift member so that no manual operating force is required for the shift member. CONSTITUTION:A front wheel output shaft 15 incorporates an engagement lock mechanism 24 for supporting a reaction force transmitted from a friction clutch 18 in the direction of clutch disengagement. This engagement lock mechanism 24 is composed of a hook member 24a and a spring 24b urging the hook member 24 in the projecting direction. When a shift member 19 is shifted into the clutch 18 engagement condition, the hook member 24a is engaged in a lock hole 19c formed in the shift member 19, and therefore, the position of the shift member 19 is held. Accordingly, no manual operating force is required for the shift member 19, it is possible to reduce the burden for the operation of the clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating structure for a mechanical friction clutch that is engaged and operated by an artificial pressing action of a shift member that is interlocked with a human operating tool.

[Prior Art] Friction clutches are widely used due to their advantages such as less shock during critical power transmission, and hydraulic multi-plate clutches are often used in work vehicles and the like. However, this hydraulic multi-disc clutch is relatively expensive, and the structure of the entire system tends to be complicated due to the hydraulic pump for supplying clutch hydraulic oil, oil passages, etc., so as mentioned above, Mechanical friction clutches with a simple structure and manually operated have begun to be partially used.

[Problems to be solved by the invention] In a friction clutch, a driving side friction member is pressed by a passive side friction member, or vice versa, by a shift member, and power is transmitted by the frictional force at the contact surface of both friction members. Therefore, if you do not apply sufficient pressure to all shift members and hold them,
A sliding phenomenon occurs on the contact surface, resulting in insufficient power transmission. Therefore, while power is being transmitted by the friction clutch, a large operating force 7 must be applied to the shift member using a manual operating tool, which poses a disadvantage to the operator.

An object of the present invention is to reduce the burden on a mechanical friction clutch which is operated by human operating force during the latching operation as described above.

[Means for Solving Problem E] The feature of the present invention lies in the operation structure of the mechanical friction clutch as described above. In addition to providing a supporting engagement lock mechanism, the engagement lock mechanism is configured to be unlocked by the initial operation of the first clutch operation system toward the clutch release side, and its operation and effects are as follows. That's right.

[Function] Once the engagement opening vine mechanism as described above is provided, the shift member can be removed. When the clutch is engaged, the reaction force acting on the shift member towards the clutch disengagement side is supported by the locking action of the engagement lock mechanism, so that from then on, a large operating force is required to maintain the clutch engaged state. There is no need to add it to the parts. Then, when the manual operation tool is started to be operated toward the latch release side, the locking action is released by the initial operation of the operation system, so that the clutch release operation can be easily performed.

〔Effect of the invention〕

As explained above, by providing the engagement lock mechanism with the role of supporting the reaction force toward the clutch disengagement side that acts on the shift member in the clutch engagement state, the shift member remains constant throughout the clutch engagement operation. There is no need to artificially apply operating force, reducing the burden on the operator when operating the clutch.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A four-wheel drive agricultural tractor, which is an embodiment of the present invention, will be described below with reference to the drawings.

As shown in Figure 5, a pair of left and right steering type front wheels (1)
, (1) and rear wheels (2), (2) k The engine (4), main clutch (5), transmission case (6), and control section (
7) A lift arm (8) that can be freely swung up and down to connect various working devices such as a rotary tiller to the rear of the aircraft so that it can be raised and lowered, and a PTO shaft (9) that transmits power to the working devices. A four-wheel drive agricultural tractor is constructed with the following.

Next, we will explain the power transmission system of agricultural tractors in detail.
As shown in Figures 4 and 5, the power from the engine (4) is transmitted via the main clutch (5) and the power transmission shaft αυ to the main transmission!!1 (not shown) in the mission case (6). ) and auxiliary transmission @021, the gears are changed and the rear wheels (2
) l (2) ', and the auxiliary transmission (2)
) The power branched from the gear (12m) is sent to the front wheel transmission α
It is sent to Q and the gear is changed, and the front wheel differential is operated via the front export power shaft 01! (Ill), front wheels (1), (1)
It is configured to drive.

Next, the front wheel transmission to which the present invention is applied will be described. As shown in FIGS. 1 and 4, the gear (1aa )
i is fixed to the transmission shaft α4, and two types of output gears (16m) and (16b) k are fixed to this transmission shaft (2).

Furthermore, a passive gear (16&) meshes with this output gear (16&).
7&)', fit freely around the front output power shaft 4, and connect the output gear (1
The passive gear (17b) that engages with the clutch case (18&) is fixed to the clutch case (18&) that is loosely fitted onto the front export force shaft 4, and the passive gear (1'7a) and the clutch case (
Between 18a) and 18a), four shift members for press-on operation of a friction clutch (g), which will be described later, are attached to the front export force shaft (g) with a spline structure so that they can integrally rotate and slide in the axial direction. This shift member 4 is held by a cam part (19b)' which has an engaging part (19&) on the passive gear (17m) side and a convex part on the circumferential side on the passive gear (17b) side. ), a multi-disc friction clutch (g) is constructed between the shift member aa and the passive gear (17&), and an engagement clutch 4 is constructed between the shift member aa and the passive gear (17&).

Then, when the shift member 09 is moved forward and backward in the axial direction to turn on the engaging clutch (7), the power is transferred to the output gear (1aa), the passive gear (17M), the engaging clutch rod, and the shift member. Qll-through front wheel (1), (
In a standard drive state in which the drive speed of wheel 1) is approximately the same speed as rear wheels (2), (2), the drive speed fL is transmitted to the front export force axis αQ.

In addition, when the friction clamper Q81'i is engaged, the power is transmitted through the output gear (16b), the passive gear (17b), and the J friction latch (g), so that the drive speed of the front wheels (1) and (1) changes to the rear wheels ( 2).

(2) In the accelerated drive state where the speed is higher than that of (2), the front export force shaft (
(to).

Next, the operating structure of the shift member (19) will be described in detail.As shown in FIG.
is biased toward the dog clutch (1) side, and is operatively connected to handbrake pedals q and w, which are examples of human operating tools (e), via a shifter I2υ and a release wire (a). This release wire (A)
As shown in the diagram, the outer wire is connected to one handbrake pedal, and the inner wire is connected to the other handbrake pedal. When only one handbrake pedal is depressed, the inner wire is pulled and the shift is performed. The member (1'l is the articulating clutch (7) shown in Fig. 3)
) to the engaged state of the friction clutch 081 shown in FIG. In that case, the shift member α field is
Clutch case (13a) L-Provided pressing member (,18
b) Press k and press the cam provided on the cam part (19b) of the shift member 09 and the pressing member t, 113b)! The pressing member (18b) is moved in the axial direction by the cam action of (18c), and the friction clutch is engaged.

The front export force shaft (to) is equipped with an engagement lock mechanism (to) that supports the reaction force from the friction clutch (to) toward the clutch disengagement p side.
c) is decorated. This engagement lock mechanism (c) is composed of a hook member (24a) and a spring (24b) that urges the hook member (24&)' to the protruding side. From the state in which the engaging clutch (7) shown in Fig. 8 is engaged, the first
Shift member α to the state where friction clutch Q81 is engaged as shown in the figure.
When shift member 9 is shifted, the lock hole (1
9C), the hook member (24a) engages to maintain the position of the shift member α.

At the tip of the hook member (24m), as shown in the figure,
A part of the taper extends over a distance corresponding to the depth of the lock hole (190), and the handbrake pedal (to) is stopped from being depressed and is activated by a biasing mechanism (not shown) built into the shifter shaft υ. , when the shifter eυ moves by a set distance from the friction clutch (7) engaged state shown in FIG. 1 to the engagement clutch (E) side shown in FIG. The υ end touches a part of the taper and the hook member (2
4m) is pushed into the front export force axis (to) by the set depth. When it comes to this position, the lower end of the tapered part of the hook member (J4m) is pushed inward as well as the far end of the lock hole (194) of the shift member Q field, so from this state, the spring Q
The biasing force of 4 causes the shift member a to move to the hook member (24
a) While pushing further, as shown in Figure 8,
It will shift to the biting type clutch (E) side.

[Brief explanation of drawings]

The drawings show an embodiment of the operating structure of a mechanical friction clutch according to the present invention, in which FIG. 1 is a side view of the front wheel transmission showing the state in which the friction clutch of the speed increasing drive system is engaged and operated, and FIG. A side view showing the state in which the locking action of the hook member is released from the state shown in the figure, Fig. 3 is a side view showing the state in which the standard drive system's articulating clutch is operated by seven people, and Fig. 4 is the auxiliary gear shift of the agricultural tractor. A schematic plan view of the device and the vicinity of the front wheel transmission, and FIG. 5 is a side view of the entire agricultural tractor. α~...Friction clutch, QQ...Shift member, ■...Artificial operating tool, ■...Engagement lock mechanism.

Claims (1)

[Claims] A shift member (19) interlockingly connected to a human operating tool (23)
This is the operating structure of a mechanical friction clutch that is engaged and operated by an artificial pressing action of a friction clutch (
18) An engagement lock mechanism (24) is provided to support the reaction force toward the clutch disengagement side acting on the shift member (19) when the shift member (19) is engaged, and the engagement lock mechanism (24) is provided.
A mechanical friction clutch operating structure configured to be unlocked by initial activation of the clutch operating system to the clutch release side.