JPS6224863Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides a fifth speed gear (overtop gear) and a
This output shaft is used in a gear transmission that is configured so that the synchronized mesh mechanism (clutch mechanism) can be installed, and has a common basic configuration for 4 forward speeds and 5 forward speeds. This invention relates to a lubrication structure for a rear bearing rotatably supported on an extension housing.

When this type of gear transmission is used as a five-speed forward gear transmission, the rear bearing of the output shaft is lubricated by the rear bearing of the fifth gear on the output shaft in the extension housing.
This is accomplished by the oil scooping action of the counter gear that rotates in mesh with the high speed gear. However, when the transmission has four forward speeds, there is no fifth speed gear and a counter gear that meshes with the fifth speed gear, so the rear bearing may not be sufficiently lubricated.

In view of these conventional circumstances, this invention proposes that even when a gear transmission is used as a 4-speed forward transmission, by adding a simple member, the rear of the output shaft can be adjusted in the same manner as in the case of a 5-speed forward transmission. The object is to provide a bearing lubrication structure that can effectively lubricate a bearing.

Next, the configuration of this invention will be explained in detail according to an embodiment shown in the drawings.

FIG. 1 is a cross-sectional view showing the main parts when a gear transmission having a common basic configuration for a five-speed forward transmission and a four-speed forward transmission is used as a four-speed forward transmission. In FIG. 1, reference numeral 1 indicates a transmission case, and 2 indicates an extension housing integrally installed on the rear side of this case. The output shaft 3 of the transmission is supported in the rear direction by a center bearing 4 and a rear bearing 5, respectively, against the rear wall of the transmission case 1 and the inner wall 2a of the extension housing 2. It is extending. A spacer 6 is provided between the inner races of the center bearing 4 and the rear bearing 5 so as to be concentric with the output shaft 3. This spacer 6 is provided in a space in which a fifth speed gear in the case of a five-speed forward transmission and a synchromesh mechanism (clutch mechanism) necessary for its shifting are to be provided.

On the other hand, the counter gear 7 (only the counter first gear is shown in the drawing), which is disposed parallel to the output shaft 3, has both ends rotatably supported by the transmission case 1. However, in FIG. 1, only the rear support structure rotatably supported by a bearing 18 on the rear wall of the case 1 is shown. The shaft portion 8 of this counter gear 7 is
It extends from the portion supported by the bearing 18 to the inside of the extension housing 2. A sleeve-shaped spacer 19 is disposed on the axis of the extended shaft portion 8, and the fifth speed counter gear in the case of a five-speed forward transmission is disposed at the location where this spacer 19 is disposed. It is a space that should be used. Note that this spacer 19 is configured as follows in order to apply a preload to the above-mentioned bearing 18.

That is, in the shaft portion 8, a bolt 10 for attaching the fifth speed counter gear is screwed into a screw hole 9 formed along the axis from the end surface of the shaft portion 8.
In the case of variable speed, a plate 13 (described later) is tightened to the end surface of the shaft portion 8 using the bolt 10, and the tightening force of the bolt 10 applies preload to the bearing 18 through the spacer 19.

Now, as is clear from FIGS. 2 to 4, the plate 13 is formed into a disk shape as a whole, and the bolt 10 is attached to the center of the plate 13.
A mounting hole 14 is drilled through which it is inserted. By bending the outer peripheral portion of this plate 13 to one side, an inclined surface 15 that continues in the circumferential direction is formed. Moreover, this inclined surface 15 has bulges that are further curved in the same direction as the bending direction of the inclined surface 15 (see especially FIG. 4) at multiple locations (four locations in the drawing) in the circumferential direction. 16 are formed. When the plate 13 formed in this manner is fixed to the end face of the shaft portion 8 by tightening the bolts 10 as shown in FIG. The bulging portions 16 are located toward the rear bearing 5, and each of the bulging portions 16 protrudes further toward the rear from the inclined surface 15. In FIG. 1, a washer 11 and a spring washer 12 are interposed between the plate 13 and the head of the bolt 10.

In the above configuration, while the vehicle is running (including idling), as the counter gear 7 rotates, the plate 1 fixed to the shaft portion 8 of the counter gear 7 rotates.
3 also rotate integrally in the direction of the arrow in FIG. By rotating this plate 13, each of the above-mentioned bulges 16
serves as a kind of blade, and the lubricating oil accumulated at the bottom of the extension housing 2 is scraped upward along with its viscosity.
Due to the centrifugal force caused by the rotation of the plate 13, this oil is moved along the inclined surface 15 to the rear bearing 5 of the output shaft 3.
The rear bearing was scattered towards the
lubricating oil is supplied to the

Note that when the vehicle is running at high speed, the above-mentioned bulge 1
It has been found through various experiments that the function of supplying oil to the rear bearing 5 can also be achieved by a plate having only the inclined surface 15 without the plate 6. Furthermore, the shape of the bulging portion 16 may be, for example, a flat surface protruding into a mountain shape instead of the illustrated curved surface.

As described above, this invention is a transmission that shares the basic configuration of a 4-speed forward transmission and a 5-speed forward transmission, and even when this transmission is used as a 4-speed forward transmission, the shaft of the counter gear can be changed. By simply attaching a simple plate to the rear bearing of the output shaft, the lubrication of the rear bearing of the output shaft can be maintained as well as in the case of a five-speed forward transmission. In particular, the present invention has a plurality of bulges formed on the outer periphery of the plate that serve to scoop up lubricating oil when the plate rotates, and a slope formed by bending the outer periphery of the plate. The surface functions to guide the scraped up oil to a predetermined location, so it is easy to manufacture, unlike a blade formed by cutting and bending the outer periphery of the plate, for example. Of course, it is easy and cost-effective,
It has the strength to withstand the viscous resistance of oil, and at the same time can properly supply oil to the necessary locations, making it ideal as a substitute for the 5th gear counter gear when the transmission is used for 4 forward gears. The plate has the advantage that it is sufficiently durable.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and Fig. 1 shows the main parts when a gear transmission with a common basic configuration of 4 forward speeds and 5 forward speeds is used with 4 forward speeds. 2 is an enlarged plan view of only the plate, FIG. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a partial view of FIG. 2 viewed from the direction of the arrow. . 1... Transmission case, 2... Extension housing, 3... Output shaft, 4... Output center bearing,
5...Output rear bearing, 7...Counter gear, 8...Shaft portion of counter gear, 1
0... bolt, 13... plate, 15... inclined surface, 16... bulge.

Claims (1)

[Scope of utility model registration request] Inside the extension housing, a disc-shaped plate is fixed to the shaft portion of the counter gear to which the 5th speed counter gear is to be installed, and the outer circumference of this plate is extended over the entire area above the counter gear. A slope is formed by bending the output shaft towards the rear bearing of the output shaft, which is located at a position closer to the rear. The lubricating oil is locally inflated in the same direction as the plate to form a bulging part, and the lubricating oil is transferred to the rear by the scooping function of each bulging part and the guiding function of the oil by the inclined surface when the plate rotates. A bearing lubrication structure in a gear transmission characterized by being configured so that the lubrication is dispersed toward the bearing.