JPH06147007A - Bearing device for engine crankcase - Google Patents

Abstract

(57) [Abstract] [Purpose] Streamline the work of assembling the same speed type and the deceleration type, enable the test operation of the engine even before the completion of assembly of the power take-off shaft 11, reduce the number of parts, and rationalize parts management. To do. [Structure] The crankshaft 4 includes a power take-out gear 5 and a camshaft gear 6. The power take-off shaft 11 has a same-speed power take-out shaft 11A having a same-speed transmission gear 12 that meshes with the power take-out gear 5 of the crankshaft 4 and a reduction power take-out shaft 11B having a reduction transmission gear 13 as separate bodies. Constitute. A hole 20 for assembling the power take-off shaft 11 is opened in the crankcase lid 2,
Any one of the above power take-out shafts 11A from the assembling hole 20.
11B is inserted, the base end portions 11a and 11b are pivotally supported by the power take-off shaft bearings 15a and 15b of the bearing plate 14, and the other end portions are extended from the assembling hole 20 to form the assembly. The hole 20 is closed by the power take-off shaft bearing 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for an engine crankcase, and more particularly to a crankcase of an engine constructed by connecting a power take-off shaft to the crankshaft such that the power takeoff shaft can rotate at the same speed or can rotate at a reduced speed. Bearing device.

[0002]

2. Description of the Related Art Conventionally, as crankshaft bearing devices, those shown in FIGS. 2 and 3 have been known. Here, FIG. 2 is a front view of an air-cooled vertical gasoline engine, FIG. 3 (A) is a cross-sectional plan view of the engine having a direct coupling type power takeoff shaft, and FIG. 3 (B) is a deceleration type power takeoff shaft. FIG. 3 is a cross-sectional plan view of the engine having the engine.

This conventional example has the following basic structure.
That is, the crankshaft 4 is connected to the crankcase 1 of the engine E via the crank bearings 3a and 3b and the cam bearings 7a and 7b.
The cam shafts 8 are rotatably pivoted via b, the cam shafts 8 are transmission-coupled to the crank shafts 5, and the power take-off shafts 11 are extended from the crank case lid 2 to the outside. The shaft 11 is configured to be integrally rotatable with the crankshaft 4 as shown in FIG. 3 (A), or is transmission-coupled so as to be capable of decelerating rotation as shown in FIG. 3 (B).

As shown in FIG. 3 (A), the power take-off shaft 11 is configured to be integrally rotatable with the crankshaft 4 in the case of the same speed type, and is shown in FIG. 3 (B) in the case of the deceleration type. As shown, the cam shaft 8 and the cam shaft 8 are integrally rotatable. The crankcase cover 2 is formed as a common component, and a through hole is formed in the corresponding bearing portion depending on whether it is a direct connection type or a reduction type. The power takeoff shaft 11 is set to have a constant rotation direction A in any case. In other words, depending on whether it is the same speed type or deceleration type,
The rotation direction of the crankshaft 4 is set so as to change to the A direction or the B direction.

[0005]

In the above-mentioned conventional example, the power take-off shaft 11 rotates integrally with the crankshaft 4 in the case of the same speed type and the camshaft 8 in the case of the speed reduction type. Since they are configured, both types must be separately assembled at the stage of assembling the crankshaft 5 and the camshaft 8, and the assembling work becomes complicated and the power take-off shaft 1
The test operation of the engine can be performed only after completion of the assembly of 1.

Further, in this conventional example, there are two types of crankshaft 4 and camshaft 8 depending on whether they are a direct connection type or a deceleration type.
In addition, since the rotation direction of the crankshaft 4 changes to the A direction or the B direction, two types of parts such as a fan cover, a recoil starter and other parts are prepared corresponding to this rotation direction. There must be. Therefore, parts management becomes complicated.

The present invention has been made in consideration of such circumstances, and it is necessary to reduce the assembling work of both types as much as possible to rationalize the assembling work, and to perform the test operation of the engine even before the completion of the assembling of the power take-off shaft. Making it possible, reducing the number of parts, and rationalizing parts management are the technical issues.

[0008]

The means adopted by the present invention to solve the above-mentioned problems is a bearing device for a crankcase having the above-mentioned basic structure.
A power take-out gear 5 and a cam shaft gear 6 are provided in this order from the crank bearing 3a side of the crank case lid 2, and the power take-out shaft 11 is configured as an independent component separately from the crank shaft 4 and the cam shaft 8. , The same speed power takeoff shaft 11A having the same speed transmission gear 12 meshing with the power takeout gear 5 of the crankshaft 4 and the speed reduction power takeoff shaft 11B having the speed reduction transmission gear 13 are separately configured, A bearing plate 14 is attached to the inside of the crankcase 1, and the camshaft 8 is attached to the bearing plate 14.
The cam bearing 7a pivotally supporting the base end portion 8a of each of the above, and each power takeoff shaft bearing 15 pivotally supporting each of the base end portions 11a and 11b of the same speed power takeoff shaft 11A and the deceleration power takeoff shaft 11B.
a. 15b are provided, an assembling hole 20 for the power take-off shaft 11 is opened in the crankcase lid 2, and one of the power take-out shafts 11A, 11B is inserted through the assembling hole 20. The end portions 11a and 11b are pivotally supported by the power take-off shaft bearings 15a and 15b, and the other end portions are extended from the assembling hole 20, and the assembling hole 20 is made by the power take-out shaft bearing 21. The gist is that it is closed and configured.

[0009]

According to the present invention, the power take-off shaft 11 is constructed as an independent component separately from the crankshaft 4 and the cam shaft 8, and has the same speed transmission gear 12 in advance.
A and a deceleration power take-off shaft 11 having a reduction transmission gear 13
B and are prepared. The same speed power take-off shaft 11A or the deceleration power take-out shaft 11B is assembled in the final assembling stage according to any type.

That is, when the same speed power takeoff shaft 11A is assembled, the same speed transmission gear 1 of the same speed power takeoff shaft 11A is mounted.
2 is inserted through the assembling hole 20, the base end 11a is pivotally supported by the power take-out shaft bearing 15a of the bearing plate 14, and the other end is used for this assembling. Hole 2
0, and the assembling hole 20 is used for the power take-off shaft bearing 2
Close at 1a. Further, when assembling the deceleration power take-out shaft 11B, the base end 11b having the deceleration transmission gear 13 of the deceleration power take-out shaft 11A fixed therein is inserted through the assembling hole 20, and the base end 11b is inserted. The power take-off shaft bearing 15b of the bearing plate 14 is pivotally supported, the other end is extended from the assembling hole 20, and the assembling hole 20 is closed by the power take-out shaft bearing 21b.

[0011]

The present invention has the following effects. Power extraction shaft 11A for same speed or power extraction shaft 11 for deceleration
Since B can be assembled at the final assembly stage according to either type without removing the crankcase lid 2, it is easy to change the assembly, and the assembly work for both types is greatly reduced. , Assembly work can be streamlined. After the assembly of the crankshaft 4 and the camshaft 8 is completed, the power take-out shaft 11A for the same speed or the power take-out shaft 11B for deceleration is assembled, so that these power take-out shafts 11A.
The test operation of the engine is possible even before the assembly of 1B is completed. Power extraction shaft 11A for same speed and power extraction shaft 11B for deceleration
Have the same rotation direction and it is not necessary to change the rotation direction of the crankshaft 4. Therefore, for example, two kinds of parts such as a fan cover, a recoil starter and other parts are prepared depending on whether they are for the same speed or for deceleration. No need. Also, 2
Same speed power take-off shaft 11A and deceleration power take-off shaft 11
Only B is prepared, and it is not necessary to prepare two types of crankshaft 4 and camshaft 8. As a result, the number of parts can be reduced and the parts management can be rationalized.

[0012]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 is an exploded perspective view of a bearing device for a crankcase according to an embodiment of the present invention. Note that reference numeral 10
Shows the whole crankcase bearing device. The bearing device 10 has the basic structure as shown in FIG. That is, the crankcase 1 of the engine E is connected to the crank bearing 3
A crankshaft 4 is rotatably supported by a cam bearing 7a, and a camshaft 8 is rotatably supported by a cam bearing 7a. The camshaft 8 is transmission-coupled to the crankshaft 4 and the power takeoff shaft 11 is a crankcase cover. 2, the power take-off shaft 11 is transmission-coupled to the crankshaft 5 so as to be rotatable at the same speed or rotatable at a reduced speed.

One end of the crank 4 shaft is a crank bearing 3a provided on the inner surface of the crank case lid 2, and the other end is a crank bearing provided on a side wall of the crank case 1 facing the case lid 2 (not shown). 4), the crank 4 shaft is connected to the crank bearing 3 of the crankcase lid 2.
A power take-out gear 5 and a cam shaft gear 6 are provided in order from the side a.

The power takeoff shaft 11 corresponds to the crankshaft 4
Also, two types of power take-off shafts 11 are provided, which are separate from the cam shaft 8 and are independent parts, and a power take-off shaft 11A for same speed shown by a solid line and a power take-off shaft 11B for deceleration shown by a virtual line are prepared.
As will be described later, they are assembled at the final assembly stage. The same speed power takeoff shaft 11A meshes with the power takeout gear 5 of the crankshaft 4 and includes a same speed transmission gear 12 set to have the same number of teeth as the power takeout gear 5. The deceleration power take-out shaft 11B meshes with the power take-out gear 5 of the crankshaft 4 and has a deceleration transmission gear 13 having the same number of teeth as the cam gear 9 of the cam shaft 8. The power take-off shaft 11A for same speed and the power take-off shaft 11B for deceleration have the same rotation direction, and it is not necessary to change the rotation direction of the crankshaft 4 either.

A bearing plate 14 for supporting the camshaft 8 and either the power take-out shaft 11A for the same speed or the power take-off shaft 11B for deceleration is attached inside the crankcase 1.
The bearing plate 14 pivotally supports the cam bearing 7a that pivotally supports the base end portion 8a of the cam shaft 8 and the base ends 11a and 11b of the power take-off shaft 11A for same speed and the power take-out shaft 11B for reduction. Bearings 15a and 15b for each power take-off shaft are provided. The bearing plate 14 is assembled with a set of mounting bosses 17 and 18 in the crankcase 1 by bolts.

The crankcase lid 2 is provided with assembling holes 20a and 20b for the same speed power takeoff shaft 11A and the deceleration power takeoff shaft 11B, and the crankcase lid 2 is first attached. After that, that is, after the assembly of the crankshaft 4 and the camshaft 8 is completed, these assembling holes 20
Any one of the above power take-off shafts 11A utilizing a.20b
Or assemble 11B.

For example, when assembling the same-speed power take-off shaft 11A, the base end portion 11a of the same-speed power take-off shaft 11A, to which the same-speed transmission gear 12 is fixed, is inserted through the assembling hole 20a. The base end 11a is pivotally supported by the power take-out shaft bearing 15a of the bearing plate 14, and the other end is extended from the assembling hole 20a, and the assembling hole 20a is taken as the power take-out shaft bearing 21a. And the other assembling hole 20b is closed by the closing lid 22b.

When assembling the deceleration power take-out shaft 11B, the base end 11b of the deceleration power take-out shaft 11A, to which the deceleration transmission gear 13 is fixed, is inserted through the assembling hole 20b. The end 11b is pivotally supported by the power take-off shaft bearing 15b of the bearing plate 14, and the other end is extended from the assembling hole 20b, and the assembling hole 20b is closed by the power take-out shaft bearing 21b. , The other assembling hole 20a is closed by the closing lid 22a.

That is, the previously prepared same speed power take-off shaft 11A and deceleration power take-out shaft 11B are assembled in the final assembly stage without removing the crankcase lid 2. This makes it easier to change the assembly, greatly reducing the assembly work of both types,
The assembly work can be streamlined. Further, since the same speed power takeoff shaft 11A or the deceleration power takeoff shaft 11B is assembled after the crankshaft 4 and the camshaft 8 are assembled, the engine can be operated even before these power takeout shafts 11A and 11B are assembled. It is convenient because test operation is possible.

Further, the same speed power take-off shaft 11A and the deceleration power take-off shaft 11B have the same rotational direction, and it is not necessary to change the rotational direction of the crankshaft 4. It is not necessary to prepare two types of parts such as a fan cover, a recoil starter, and other parts depending on whether it is for deceleration. In addition, the crankshaft 4 can be provided by simply preparing two types of the same speed power takeoff shaft 11A and a deceleration power takeoff shaft 11B.
Also, it is not necessary to prepare two types of cam shafts 8. As a result, the number of parts can be reduced and the parts management can be rationalized.

In the above embodiment, the crankcase lid 2 has two
Although the description has been made assuming that the two assembling holes 20a and 20b are opened, the present invention is not limited to the above-mentioned embodiment, and the base end portion 11a on which the same speed transmission gear 12 of the same speed power takeoff shaft 11A is fixedly installed. And the reduction transmission gear 13 of the deceleration power take-off shaft 11A
As long as the fixed base end 11b can be inserted through the assembling hole 20b, one assembling hole 20b can be used, and other members can be appropriately modified. Getting it doesn't require much.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a crankcase bearing device according to an embodiment of the present invention.

FIG. 2 is a front view of an air-cooled vertical gasoline engine.

FIG. 3 is a cross-sectional plan view of an engine according to a conventional example, FIG. 3A is a cross-sectional plan view of an engine having a direct coupling type power takeoff shaft, and FIG. 3B is a deceleration type power takeoff shaft. It is a cross-sectional top view of an engine.

[Explanation of symbols]

E ... Engine, 1 ... Crank case, 3a ... Crank bearing, 4
… Crankshaft, 5… Gear for extracting power,
6 ... Cam shaft gear, 7a ... Cam bearing,
8 ... cam shaft, 8a ... base end of cam shaft,
10 ... Bearing device, 11 ... Power output shaft,
11A ... Power extraction shaft for same speed, 11B ...
Power extraction shaft for deceleration, 11a, 11b ... Proximal end portion of power extraction shaft, 15a, 15b ... Bearing for power extraction shaft, 12 ... Same speed transmission gear, 13 ... Deceleration transmission gear, 14
… Bearing plate, 20 (20a ・ 20b)… Assembling hole for power take-off shaft, 2
1 (21a ・ 21b) ... Bearing for power take-off shaft.

Claims (1)

[Claims] 1. A crankcase (1) of an engine (E),
A crank shaft (4) is rotatably supported by a crank bearing (3a) and a cam shaft (8) is rotatably supported by a cam bearing (7a). The cam shaft (8) is rotatably supported by the crank shaft (4). ), The power take-off shaft (11) is extended from the crank case lid (2) to the outside of the crank case (1), and the power take-off shaft (11) rotates at the same speed with respect to the crank shaft (4). In a bearing device for a crankcase of an engine configured to be transmission-coupled so as to be capable of rotating at a reduced speed, the crankshaft (4) includes a crankshaft (4), a crankshaft (3a) side of the crankcase cover (2), in order from a power take-out gear ( 5) and a camshaft gear (6), the power take-off shaft (11) includes a crankshaft (4) and a camshaft (8).
Separately from the above, it is configured as an independent part and is a same speed transmission gear that meshes with the power take-off gear (5) of the crankshaft (4).
A power take-off shaft (11A) for the same speed having (12) and a power take-off shaft (11B) for reduction having the reduction transmission gear (13) are separately configured, and a bearing plate is provided in the crankcase (1). (14) is attached to the bearing plate (14), and the cam bearing (7a) pivotally supports the base end portion (8a) of the camshaft (8), and the power take-off shaft (11A) for the same speed.
And each base end portion (11a) of the power take-off shaft (11B) for deceleration
Bearings (15a) and (1) for each power take-off shaft that pivotally support (11b)
5b) is provided, an assembling hole (20) for the power take-off shaft (11) is made in the crankcase lid (2), and one of the power take-off shafts (11A) is made through the assembling hole (20).・ (11B) is inserted and the base end parts (11a) and (11b) are inserted into the bearing for power take-off shaft (1
5a) and (15b), and the other end is extended from this assembly hole (20) and the assembly hole (20) is closed by the power take-off shaft bearing (21). A bearing device for an engine crankcase characterized by being configured.