JPS5817148Y2 - Inertial slip prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for preventing inertial rotation of a propulsion shaft when a clutch is disengaged.

As a power transmission device for a tractor, etc., a clutch is interposed between the engine crankshaft and the propulsion shaft, and a clutch release hub is fitted and supported by the propulsion shaft case surrounding the propulsion shaft, and is linked to depression of the clutch pedal. The clutch is configured to be disengaged by moving the release hub in the axial direction.

Conventionally, in this type of power transmission device, the propulsion shaft has been provided with a brake means that performs a braking action in conjunction with the clutch disengagement operation in order to prevent inertial slippage occurring in the propulsion shaft after the clutch is disengaged.

However, since the brake means is provided at the end of the propulsion shaft inside the transmission case, the brake means is constantly wetted by the lubricating oil that has flowed into the transmission case, and the brake means is not controlled during braking operation. The disadvantage is that the dynamic frictional force is reduced by the lubricating oil, thus reducing the effectiveness of the braking action.

Therefore, in view of the above problems, the present invention is designed to prevent the brake means from getting wet due to lubricating oil and to simplify the structure.The main feature of this invention is that the propulsion shaft protrudes from the transmission case. A propulsion shaft case is fixed to the transmission case side surrounding the transmission case, and a clutch release hub is fitted and supported on the propulsion shaft case so as to be movable in the axial direction.
In a power transmission device that drives a propulsion shaft intermittently, a brake case is formed by a rear end flange extending from the rear end of the propulsion shaft case and fixed to the transmission case side and a wall side of the transmission case. A brake disc is fixed to the propulsion shaft within the case so that it can rotate freely.
A pressing braking body is supported by the brake case facing the outer periphery of the brake disc, and the pressing braking body can be released from pressing against the brake disc by a brake operation mechanism that is linked to the engagement and disengagement operation of the clutch.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention provided in a power transmission device for a tractor will be described in detail.

In FIG. 1 showing the overall configuration and FIG. 2 taken in the direction of the arrows in FIG.

The propulsion shaft 3 has a plurality of gears 4 for power transmission, and is supported by a ball bearing 7 on the intermediate wall 6 of the transmission case 5. The front end of the propulsion shaft 3 is connected to the clutch 2 to prevent its engagement and disengagement. Intermittent.

Reference numeral 8 is a transmission shaft for the traveling system, and a transmission gear 9 is slidably provided thereon.

10 is a propulsion shaft case that surrounds the propulsion shaft 3.

The propulsion shaft case 10 is separated from a rear end flange 11 and a cylindrical portion 12, and the rear end flange 11 has a shape extending in three directions as shown in the second figure, and is attached to the intermediate wall 6 with bolts 13. The sheet metal mounting is attached to the case 14 with bolts 15, and the mounting allows a brake disc to be installed in the empty space surrounded by the case 14 and the rear end flange 11, through which the propulsion shaft 3 is inserted. It makes up the brake case.

Reference numeral 16 denotes a clutch release hub, which is fitted and supported by the cylindrical portion 12 of the propulsion shaft case 10 so as to be freely slidable in the axial direction, and has a clutch release bearing 17 at the front end of the hub 16.

The clutch release bearing 17 presses the overseas clutch release lever to disengage the clutch 2, and the release hub 16 and the fixed flange 1
1, a return spring 18 is stretched between the two.

A clutch operation system for moving the clutch release hub 16 in the axial direction is composed of a clutch pedal 19, a clutch rod 20, a fork shaft 22 having a clutch lever 21, a clutch release fork 23, and the like.

That is, the base of the clutch pedal 19 is supported by a pedal shaft 24 in the lower abdomen of the transmission case 5, and the clutch pedal 19 has a spring 2.
5, and can be stepped freely.

The shaft length of the clutch rod 20 is adjustable by screw means, and one end is engaged with a lever 26 of the pedal 19, and the other end is pivotally supported by the lower end of a clutch lever 21 fixed to a fork shaft 22. There is.

The fork shaft 22 is rotatably supported by the clutch housing 27 across the clutch housing 27, and a fork 23 is installed approximately at the center of the fork shaft 22.

The fork 23 has a bifurcated shape and engages with protrusions 28 protruding on both sides of the hub 16 from the rear surface.

Therefore, as is well known, when the clutch pedal 19 is depressed, the clutch rod 20, clutch lever 21, and fork shaft 22 are
The fork 23 is swung through the fork 23, and the release hub 16 slides toward the clutch 2 against the spring 18, thereby disengaging the clutch 2.

An inspection window 29 is provided in the side wall of the clutch housing 27 for adjusting the disconnection timing and for replacing and inspecting various internal parts of the clutch housing 27.

A brake means 30' is installed in a required space between the rear end flange 11 of the propulsion shaft case 10 and the mounting case 14.

Two embodiments of the braking means 30' are shown in FIGS. 4I and 4II.

4I and II, a first coupling 30 is fitted onto the propulsion shaft 3, and a second coupling ring 31 is fitted onto the first coupling 30.

When the first and second coupling rings 30, 31 are fastened together with a plurality of bolts 32, by forming their overlapping surfaces into tapered surfaces 33, the first coupling 30 can be attached to the propulsion shaft 3.
Therefore, the first coupling 30 is preferably a divided body.

A brake disc 34 is attached to the second coupling 31 via a spline connection 35, and the brake disc 34 rotates together with the propulsion shaft 3.

Lining pads 36 and 37 are provided oppositely on both sides of the outer circumference of the brake disc 34, sandwiching it therebetween.

In Figure 4, the movable pad 36 is firmly attached by fitting into a cup-shaped recess of a pad holder 38 slidably provided on the rear end flange 11 and caulking its peripheral edge 38a. The fixing pad 37 is attached to a recessed portion of the case 14 using an adhesive or the like.

In FIG. 4 II, the fixed pad 37 is also fitted into the pad holder 39 and attached by caulking its peripheral edge 39 a, and the pad holder 39 is firmly fastened to the case 14 with a nut 40. .

The pad 36 and pad holder 38 constitute a pressing braking body.

41 is a brake operating lever, and the rear end flange 11
The brake operating lever 41 has an actuating element 41 a whose tip is an arcuate surface.
is fixed.

The actuator 41a is in contact with the movable pad holder 38, and when the brake actuation lever 41 swings about the pivot 42, the pad holder 3 is moved through the actuator 41a.
8 toward the brake disk 34, where the brake disk 34 is connected to the movable pad 36 and the fixed pad 37.
It is clamped and braked.

The brake operating means for interlockingly braking the brake means 30' by operating the clutch operating system in the disconnecting direction is a Bowden brake lever whose one end is connected to the brake operating lever 41 and the other end is connected to the clutch rod 20 side. It consists of a wire 43.

and brake operating lever 41. The actuator 41a and the Bowden wire 43 constitute a brake operating mechanism.

That is, as shown in the second figure, a receiver 45 for the outer wire 43a, which can be threadedly adjusted, is attached to the cover 44 that covers the inspection window 29, and the inner wire 43b is connected to the brake operating lever 41 through the inspection window 29 by a connector 46. do.

On the other hand, in step 47, a metal fitting 48 is placed and fixed, and an outer receiver 49 is connected to the metal fitting 48, and
The Bowden wire 43 and the clutch rod 20 are connected by an interlocking lever 50.

The operation of the present invention configured as described above is mainly shown in Fig. 3 I.
, II.

When the clutch 2 is in the connected position, the propulsion shaft 3 is in a state of rotation integrally with the crankshaft of the engine, and at this time, the brake means 30' is in a non-braking state and the brake device 3 is in the non-braking state.
4 rotates together with the propulsion shaft 3.

Therefore, when the clutch pedal 19 is depressed during gear shifting, the fork 23 swings and moves clockwise in FIG. Clutch 2 cannot be slid toward Clutch 2, and the clutch 2 is disengaged in the conventional manner.

The brake means 30' is braked in conjunction with this clutch disengagement operation, and this is done in the following manner.

By depressing the clutch pedal 19, the clutch rod 2
0 moves, the poaching wire 43 is operated via the interlocking lever 50.

Since the inner wire 43a of the poaching wire 43 is connected to the brake operating lever 41 via the connector 46, the lever 41, which was in the position shown in FIG. Get into a position like Figure II.

When the brake operating lever 41 is in the position shown in FIG. 3 II,
Since the actuator 41a presses the movable pad holder 38, the brake disc 34 is clamped by the cooperation between the movable pad 36 and the fixed pad 37, and braking is performed by the friction.

This brake disk 34 is connected to the first and second couplings 3
Since it is fixed to the propulsion shaft 3 through a 0.31 mm, the propulsion shaft 3 is prevented from spinning due to inertia after the clutch is disengaged.

Therefore, one end of the poaching wire 43 is connected to the inspection window 29.
The outer receiver 45 provided on the cover 44 and the step 4
7 can be attached with the outer receiver 49 provided on the metal fitting 48, so that the distance between the inner wires 43 and 43 can be adjusted.
Even if there is an elongation of b, it can always be corrected to an appropriate value.

Further, since both the movable pad 36 and the fixed pad 37 are constructed as single items, replacement of the parts is extremely easy.
If the pad is caulked at 39, it is advantageous in that the pad will not peel off compared to a pad attached with adhesive.

In other words, the pad is likely to peel off due to frictional heat.

Furthermore, when attaching the brake disk 34 to the propulsion shaft 3, the first and second couplings 30 and 31 adopt an interference fit structure, making it easy to replace and install the brake disk 34. 3. No processing is required for installation.

In particular, if the brake means 30' is
Since the brake disc 34 and each pad 36, 37 of the brake means 30' are not immersed in lubricating oil and there is no risk of getting wet with lubricating oil, each pad 36 is provided inside the outer clutch housing 27. The braking friction force between the brake disc 34 and the brake disc 34 is sufficiently exerted, and the outer circumference of the brake disc 34 is
Since the structure is such that a large braking force can be obtained, the braking action against inertial idling of the propulsion shaft 3 is reliable.

In addition, the rear end flange 11 of the propulsion shaft case 10 is also used as a brake case, and the brake operating lever 41 is pivotally supported on the rear end flange 11, so there is no need for brake case constituent members or supporting members for the brake operating lever 41. Therefore, the number of parts can be reduced and the structure can be made more reliable.

Further, there is no need for any special processing on the cylindrical portion 12 of the propulsion shaft case 10 that supports the clutch release hub 16, and there is no risk of deterioration in the durability of the propulsion shaft case 10.

In this invention, the brake means for preventing the inertia of the propulsion shaft from slipping due to inertia is provided outside the transmission case, which prevents the brake disc and pressure braking body that serve as the brake means from getting wet with lubricating oil. Since the outer periphery is pressed by a pressure braking body, a reliable braking friction force and a large braking force can be obtained, and the braking action of the propulsion shaft is reliable.

Furthermore, since the rear end flange of the propulsion shaft case is also used as the brake case, the number of parts can be reduced, the structure can be simplified, and there is no risk of deterioration in the durability of the propulsion shaft case.

The device shown in FIG. 5 has an interlocking rod 51 or a wire attached to the clutch release fork 23, and a disc 52 splined to the propulsion shaft 3 is connected to a pair of operating levers 53.
．． The pair of levers 53 and 54 are combined in an X shape at a pivot 55, and the pad 5 is
6. Clamp at 57.

That is, when the fork 23 is swung in the cutting direction by the clutch disengaging operation, one of the actuating levers 54 is swung about the pivot shaft 55 against the spring 58 via the interlocking rod 51 or the wire, and the pad 56. The disc 52 is clamped at the shaft 57 to prevent the propulsion shaft 3 from spinning due to inertia.

Incidentally, in FIG. 5, common parts shown in FIG. 1, etc. are indicated by the same reference numerals.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing the overall configuration of the present invention, with the clutch operation system shown enlarged, and FIG. 2 showing II of FIG.
- II line arrow view, Figures I and II are explanatory diagrams of the operating state,
4I and II are enlarged sectional views showing two examples of the brake means, and FIG. 5 is a side sectional view showing another idea. 2...Clutch, 3...Propulsion shaft, 5.
...Mission case, 10...Propulsion shaft case, 14...Mounting case, 34...
...Brake disc, 36...Movable pad,
37...Fixed pad, 38.39...
Pad holder, 41... Brake operating lever,
41a... Actuator, 43... Bodenweyer.

Claims (1)

[Scope of utility model registration request] The propulsion shaft case is fixed to the transmission case side, surrounding the propulsion shaft protruding from the transmission case, and a clutch release hub is fitted and supported on the propulsion shaft case so as to be movable in the axial direction, and the clutch is released by the axial movement of the release hub. In a power transmission device that drives the propulsion shaft intermittently through the fitting and removal of A case is formed, a brake disc is fixed to the propulsion shaft within the brake case so as to be rotatable together with the brake disc, and a pressing braking body is supported by the brake case facing the outer periphery of the brake disc, and is linked to the engagement and disengagement operation of the clutch. An inertial slip prevention device characterized in that a pressure braking body can be released from being pressed against a brake disc by a brake operation mechanism.