JPH0118910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a cylindrical case that supports a transmission shaft, and a gear case that houses a transmission mechanism, with an end surface of the cylindrical case in contact with a side surface of the gear case,
In addition, the transmission shaft is inserted into the gear case and connected via a connecting bolt, and a brake disc of a disc brake and a friction plate are externally fitted to the transmission shaft portion near the connection between the cases. The present invention relates to a transmission structure with a brake, in which one of the brake disk and the friction plate is attached to the transmission shaft and the other to the cylindrical case, respectively, so that they cannot rotate relative to each other.

In the transmission structure with a brake, since the disc brake is arranged at the end of the cylindrical case, there is an advantage that the disc brake can be easily replaced when the cases are disassembled.

In this type of transmission structure with a brake, for example, one used as a steering brake in a tractor traveling mission as shown in FIG. 4 has been known.

In this conventional structure, the friction plate 21 held in the cylindrical case 8 in a relatively non-rotatable manner is
A plurality of pins 030 passing through the periphery of the case 8 are fixed to the case 8 to prevent relative rotation therebetween.

However, this conventional structure has the disadvantage that it requires troublesome work to fix the plurality of pins to the case.

On the other hand, in this type of transmission structure with a brake,
Making the contact area of the case as wide as possible improves the integrity of the joint, but in the past, the only method was to form an annular flange, so in order to increase the contact area, When the diameter of the flange is increased, the outer diameter of the case also becomes larger.In other words, since the radial width of the flange only needs to be as wide as necessary to attach the bolt, the outer diameter of the case inevitably increases. This had the disadvantage that it was difficult to make the case more compact.

The present invention is a friction plate of a disc brake, or
It is an object of the present invention to solve the above-mentioned drawbacks by devising a structure in which either one of the brake discs is held relative to the case in a non-rotatable manner.

The characteristic structure of this invention to achieve the above purpose is as follows:
A plurality of protrusions for attaching bolts protruding outward in the radial direction are provided in the circumferential direction at the end of the cylindrical case,
Further, the cylindrical case portion between the protrusions in the circumferential direction protrudes radially outward, and a friction plate or This is because an engaging recess is formed to engage the protrusion of the brake disc, and this configuration provides the following effects.

That is, although the cylindrical case is provided with a protruding part for attaching bolts that protrudes outward in the radial direction at the end of the cylindrical case to secure a flange part for attaching bolts,
The cylindrical case portion between the protrusions is bulged outward in the radial direction to form a friction plate or a recess for engagement with the protrusion of the brake disc on the inner surface of the case. If a pin for holding either the friction plate or the brake disc in a non-rotatable manner is fixed to the case, such troublesome work can be made unnecessary. Furthermore, by forming the engaging recess, the end surface of the case exhibits an uneven waveform in the circumferential direction, thereby increasing the contact area, and has the advantage that the end of the case can be reinforced. And since the protrusion for attaching the bolt and the recess for engagement are provided out of phase,
For example, compared to the case where the phases are the same, that is, the bolt attachment protrusion is provided outside the engagement recess, there is an advantage that the outer diameter of the bolt attachment portion can be made smaller.

Examples will be described below based on the drawings.

FIG. 1 is a side view of a riding rice transplanter, in which an engine 6 that drives left and right front wheels 1a, 1b and left and right rear wheels 2a, 2b is loaded in the front of the traveling body, and a control unit is located behind this engine 6. 4 is provided. A planting device 3 is towed behind the traveling body via an elevating link 5, and power from an engine 6 is transmitted via a PTO shaft 9. Reference numerals 7 and 8 are transmission transmission cases for the front wheels and rear wheels, respectively.
Power is transmitted from the front wheel transmission case 7 via the front wheel transmission case 7. A differential device is installed in the front wheel transmission case 7, and the left and right front wheels 1
The power is transmitted to a and 1b, but the rear wheel transmission case 8
The left and right steering clutches are installed inside.

FIG. 2 shows the internal structure of the rear wheel transmission case 8.

A pinion gear 11 provided at the end of the input transmission shaft 10 meshes with a hook gear 12 spline-fitted to a boss member 13, and this boss member 13 is connected to the left and right intermediate transmission shafts 14a, 14b. Supported for relative rotation. This boss member 13
There are left and right steering clutches 1 on both the left and right sides of the
Clutch pawls for 5a and 15b are provided.

Clutch pieces 16a and 16b that engage the clutch claws of the boss member 13 are spline-fitted to the center sides of the respective intermediate transmission shafts 14a and 14b, and the respective intermediate transmission shafts 14
On the other end side of a, 14b, the clutches 15a,
Disc brakes 17a and 17b are provided which are operated in conjunction with brake 15b, respectively.

That is, the intermediate transmission shafts 14a and 14b are respectively formed with square shaft portions 19 and 19, and two brake discs 20 and 20' are fitted and held on the square shaft portions 19 so as to be slidable in the axial direction. Between these two brake discs 20 and 20',
A friction plate 21 is fitted into an intermediate case 22 as a cylindrical case so as to be slidable in the axial direction.
Furthermore, contact surfaces for the brake disc 20' are also formed on the inner walls of the left and right gear cases 23a, 23b. The gear case 2 of the intermediate case 22
The joint ends with 3a and 23b are formed with a large diameter, and as shown in FIG. 3, a plurality of protrusions 18 for attaching bolts b are formed at regular intervals in the circumferential direction. A case portion between the friction plates 18 and 18 is projected radially outward, and a groove 27 is formed on the inner surface of the protrusion 25 as an engaging recess for engaging the protrusion 26 of the friction plate 21. and the inner brake disc 20 and the clutch pieces 16a, 16.
A collar 28 which is slidable in the axial direction is fitted onto the intermediate shaft between the brake disks 20 and b.
20' and the clutch pieces 16a, 16b are interlocked and connected. Inside the collars 28, 28 on the left and right intermediate shafts 14a, 14b, the clutch piece 16
Left and right springs 29, 29 for biasing a, 16b toward the clutch input side are fitted onto the respective intermediate shafts 14a, 14b.

Further, seal members 24 made of sponge are fitted onto the left and right collars 28, 28, and the clutch 15 is fitted with a seal member 24 made of sponge.
The clutches 15a, 15b are separated from the brakes 17a, 17b to prevent grease from the clutches 15a, 15b from adhering to the brakes 17a, 17b.

The transmission case 8 housing this rear wheel transmission is assembled from an intermediate case 22 and left and right gear cases 23a and 23b.

Axles 30a and 30b of rear wheels 2a and 2b are supported by gear cases 23a and 23b, respectively.

The rectangular shaft portion of the transmission shaft 14 into which the brake discs 20, 20' are fitted may be changed to spline fitting.

Also, the brake discs 20, 20' and the friction plate 2
1, the partner to which it is held non-rotatably may be interchanged.

Incidentally, although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the transmission structure with a brake according to the present invention, and FIG. 1 is an overall side view of a riding rice transplanter;
FIG. 2 is a cross-sectional plan view showing a rear wheel transmission case, FIG. 3 is a cross-sectional view taken along the line of FIG. 2, and FIG. 4 is a cross-sectional plan view showing a conventional example. 8... Cylindrical case, 14... Transmission shaft, 17...
Disc brake, 18... Protrusion for bolt attachment, 20... Brake disk, 21... Friction plate, 23a, 23b... Gear case, 26... Protrusion, 27... Engagement recess, b... Bolt .

Claims (1)

[Scope of utility model registration request] The cylindrical case 8 supporting the transmission shaft 14 is connected to the gear cases 23a and 23b containing the transmission mechanism, and the end surface of the cylindrical case 8 is connected to the gear case 2.
3a, 23b, and the transmission shaft 14 enters into the gear cases 23a, 23b and is connected via the connecting bolt b, and the transmission at a position near the connecting portion between the cases 23a, 23b. A brake disc 20 and a friction plate 21 of a disc brake 17 are fitted onto the shaft 14, and one of the brake disc 20 and friction plate 21 is attached to the transmission shaft 14, and the other is attached to the cylindrical case. In the transmission structure with a brake, the cylindrical case 22 is attached to the cylindrical case 22 so as not to rotate relative to each other.
A plurality of protrusions 18 for attaching bolts protruding outward in the radial direction are provided in the circumferential direction at the ends of the cylindrical case, and further, the cylindrical case portion between the protrusions 18 in the circumferential direction is provided in the radial direction. An engagement recess 27 is formed on the inner surface of the protrusion 25 that protrudes outward and engages the protrusion 26 of the friction plate 21 or brake disc 20 that is attached to the cylindrical case 22 so as not to be relatively rotatable. A transmission structure with a brake that is characterized by: