JPS6314129Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gearbox formed by butt-joining two halves of a box made of steel plates, and more specifically, to facilitate the attachment and detachment of a sub-case inserted and housed in the gearbox. related to things.

(b) Conventional technology Gearboxes made of steel plates are advantageous over those made of cast iron in that they are lighter in weight, cheaper in cost, and have higher strength. However, because of their thin plate structure, it is difficult to maintain precision, and the gear boxes housed inside the gearboxes are difficult to maintain. The support tends to become unstable.

For this reason, for example, "Jikko No. 38-113"
As shown in the figure, the gear group, etc. is assembled and supported on a cast iron frame separate from the box half, and the cast iron frame is inserted inside the gearbox half made of steel plate, with the inner wall of the gear box in contact with the inner wall. , the box halves are joined together to form a gear box.

(c) Problems to be solved by the invention Although conventional steel plate gearboxes are constructed as described above and are designed to improve the accuracy of assembly and support of gear groups, etc. The cast iron frame, which is the supporting frame of the gearbox, is assembled so that its outer circumferential surface is in full contact with the inner wall surface of the gearbox, with the protrusion formed on its outer edge fitting into the hole opened in the box half. Because of the structure of the gearbox, the gear support frame cannot be removed without disassembling the gearbox, and in practice, it is difficult to reassemble the gear group supported by the frame or replace the support frame itself. It's almost impossible,
As a transmission device, there is a problem that its range of use is limited and it lacks versatility. Furthermore, as mentioned above, the outer peripheral surface of the frame body is provided so as to be in contact with the inner wall surface of the gearbox over the entire surface, which causes various disadvantages to the operation of the gear group supported by the frame body, and also causes damage to the abutting portion. There is also the problem that the lubricating oil does not circulate well (even if it does circulate, it collects and the oil temperature in the bearing, which is a rotating object, rises). In such a gearbox, a cylinder that serves as both an oiling hole and a breather is usually provided in the gearbox half, but since the frame is provided in contact with the inner wall of the gearbox, the above-mentioned It is not possible to install a tube that doubles as an oil fill hole and a breather (unless you provide a through hole in the frame).

Therefore, the present invention provides a subcase attachment/detachment structure that allows the subcase to be easily removed without disassembling the gearbox, and also reduces noise during operation and improves lubricity. .

(d) Means for solving the problem In other words, the present invention provides a gear box 1 formed by joining two box halves 2 and 2' made of steel plates, with one side open.
A sub-case 8 that supports gears and the like and has an abbreviated cross-section and open holes on both sides is inserted into the gear box 1 with one side open, and a gap is created between the inner wall of the gear box 1 and the sub-case 8. A sub-case attachment/detachment structure for a gearbox, characterized in that the sub-case 8 is integrally fixed and hung vertically on a lid 19 of the gearbox 1.

I have to.

Therefore, according to the present invention, even after the subcase is assembled, the subcase can be pulled out relatively easily, making it easy to remove the subcase equipped with a gear group or to replace the gear with another one. This is easy to implement, widening the range of speed changes and improving usability.In addition, when loaded, a gap is created between the subcase and the inner wall of the gearbox, reducing noise transmission and reducing lubrication. Oil circulation also improves, reducing the rise in oil temperature and providing good lubrication to all parts.

(F) Embodiment The implementation of the present invention will be described below with reference to drawings of an embodiment, and the drawings show the case where the present invention is applied to a reduction gearbox of a tiller.

Figure 1 is a sectional view of the gearbox, Figure 2 is a cross-sectional view of the gearbox.
FIG.

The gearbox 1 is formed into a box shape by butt-joining two left-right symmetrical box halves 2 and 2' made of thin steel plates by means such as fastening or welding.
An opening is provided at the upper end, and the opening can be closed with a lid 19 that is removably attached with bolts 18.

An input shaft 4 that is passively driven by a V-pulley 3 is protruded and supported inside the gearbox 1.
A transmission mechanism that interlocks and connects the output shaft 5 and the lower output shaft 5 is housed therein.
It is divided into a secondary reduction gear mechanism 7.

In the present invention, the above-mentioned primary speed reduction mechanism 6 is assembled into a sub-case 8. The sub-case 8 has an abbreviated cross-section with open holes on both sides, is made of cast iron, etc., and has an opening above the gearbox 1. When the gear box 1 is vertically disposed inside the gear box 1 and positioned at a predetermined location, the gear box 1 is formed in such a size that an appropriate gap is created around the inner wall surface of the gear box 1.

The primary deceleration mechanism 6 of the embodiment is configured to decelerate the rotation of the input shaft 4 via the first shaft 9 and the second shaft 10. In other words, the primary deceleration mechanism 6 is configured to reduce the rotation of the input shaft 4 through the first shaft 9 and the second shaft 10. Decelerate one step, and then
From the other gear 13 of the shaft 9 to the second shaft 1 via the gear 14
At the stage of transmission to 0, the configuration is such that the speed is decelerated one more step. A sprocket 15 is fitted onto the second shaft 10, and this sprocket 15 and a lower second shaft are connected to each other.
A chain 17 is extended between the sprocket 16 of the secondary reduction mechanism 7 and the power of the second shaft 10 is transmitted to the output shaft 5.

The secondary reduction mechanism 7 of the embodiment has a sprocket 1 having a larger number of teeth than the sprocket 15 of the second shaft.
6 is simply fitted onto the output shaft 5 and there is no special gear train, so no sub-case is used. However, when the gear train is configured, the primary reduction mechanism 6 Similarly, subcase 8 may also be used.

The subcase 8 in which the primary reduction mechanism 6 is installed is
It is integrally fastened and fixed vertically to the aforementioned lid 19 with bolts 20, and by fixing the lid 19 to the gearbox, it is suspended inward from the opening of the gearbox 1 and positioned at a predetermined location. When the cover 19 is removed from the gearbox 1, the subcase 8 can also be removed as one unit.

In addition, in the embodiment, it is not possible to assemble the subcase into the gearbox 1, so in the case of such a case, after assembling the subcase, insert the input shaft 4 into the bushing from the left in FIG.
1 and the oil seal 22, it does not require much man-hours.

Note that H and H' in FIG. 1 indicate shaft insertion holes in the input shaft 4 that have a larger diameter than the outer diameter of the pinion 11.

In the gearbox constructed as described above, by attaching and detaching the lid 19 that closes the opening, the subcase 8 can be disposed at a predetermined position within the gearbox, and the subcase can be extracted from the disposed position. For example, if creep speed (very slow working speed required for ridge erecting, trenching, etc.) is required, you can either pull out the subcase and rearrange the gears, or use a subcase that is designed for creep speed. This can be done relatively easily by replacing the

When the subcase 8 is installed in the gearbox with open holes bored on both sides and has an abbreviated cross-section, a gap is secured between the subcase 8 and the inner wall surface of the gearbox 1, so that a breather, etc. Even when oil is installed, there is no oil leakage and the transmission of gear sounds to the outside is reduced, and the circulation of lubricating oil is improved, all parts are well lubricated and the rise in oil temperature is also reduced. .

(g) Effects of the device As is clear from the above explanation, the device of the present invention has a gear box with an abbreviated cross section that is housed and installed inside a steel plate gearbox with a mating structure, and open holes are bored on both sides. The sub case is installed so that it can be inserted and removed from the gearbox opening in the joined state,
When installed, the structure is such that there is a gap between the subcase and the inner wall of the gearbox, so the subcase can be removed and reinstalled relatively easily without disassembling the gearbox. This makes it possible to easily change the speed setting range of the transmission mechanism configured within the gearbox, and the gearbox itself can be made small and compact while expanding its adaptability in terms of speed and increasing its usability. The gap between the gearbox and the gearbox reduces the transmission of gear sounds generated during operation, and open holes on both sides prevent oil from accumulating and causing oil temperature to rise. It also has improved lubricity and operates well. It has advantages over conventional structures.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a tiller reduction gearbox according to the present invention, and FIG. 2 is a cross-sectional view taken along the line X--X in FIG. 1. 1... Gearbox, 2, 2... Half box, 8... Sub case, 19... Lid.

Claims (1)

[Scope of utility model registration request] In the gear box 1, which is formed by joining together two steel plate box halves 2 and 2' and has one side open, a sub-case 8 with an abbreviated cross-section and open holes on both sides that supports gears, etc. is installed as described above. It is inserted into the gearbox 1 with one side open, and a gap is provided around the inner wall of the gearbox 1 and the subcase 8, and the subcase 8 is integrally fixed and suspended from the lid 19 of the gearbox 1. A sub-case attachment/detachment structure for gearboxes.