JPS606679Y2 - Vibration prevention structure of gear transmission - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration prevention structure for an input shaft and an output shaft system, mainly in a gear transmission for an automobile.

Generally, there is some play or eccentricity in the bearings that support the input and output shafts.

As a result, each shaft will oscillate in the radial direction.

Especially at a position closer to the rear than the input bearing that supports the input shaft, the output pilot bearing that supports the output shaft with respect to the input shaft vibrates violently in the radial direction due to the vibration of the input shaft. This may cause problems such as noise.

In view of these problems, the object of this invention is to provide a vibration prevention structure that can suppress the vibration of the output shaft due to the vibration of the input shaft.

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

First, in Fig. 1, which schematically shows the support structure of each shaft of a gear transmission, and Fig. 2, which specifically shows the main parts of the support structure, the input shaft 1 and the output shaft 2 are coaxial. It is arranged.

The front end 1a of the input shaft 1 is
It is rotatably supported by an input pilot bearing 5 shown in FIG. 1 with respect to the rotation axis of a crankshaft of an engine (not shown).

In addition, the rear part of the input shaft 1 is connected to the second
It is rotatably supported by an input bearing 4 with respect to a transmission case 3 shown in the figure.

In FIG. 2, reference numeral 9 indicates a bearing retainer of the input bearing 4, and reference numeral 10 indicates an oil seal that performs a sealing function between the inner circumference of this retainer 9 and the outer circumference of the input shaft 1.

At the axial center portion of the rear end of the input shaft 1,
An inner hole 6 is formed, a portion of which serves as a contact surface with a journal bearing portion 11, which will be described later.

A front end 2a of the output shaft 2 is inserted into the inner hole 6, and the front end 2a is supported by an output pilot bearing 7 to be rotatable relative to the input shaft 1.

This bearing 7 and the input bearing 4 are
They are arranged on one plane perpendicular to the axes of the input shaft 1 and the output shaft 2, respectively.

In other words, the input bearing 4 and the output pilot bearing 7 are arranged at the same position in the direction along the axes of both shafts 1 and 2 (thrust direction).

Thereby, even if the input shaft 1 causes vibration in the radial direction due to its rotation, the accompanying vibration of the output shaft 2 can be suppressed to a small level.

Note that a rear-side portion of the output shaft 2 is rotatably supported by an output bearing 8 shown in FIG. 1 with respect to the transmission case.

The causes of the increase in the vibration of the output shaft 2 mentioned above include the uneven distribution of the input bearing 4, the output pilot bear, and the ring 7 in the thrust direction, as well as the radial alignment between the inner hole 6 of the input shaft 1 and the output shaft 2. It is also possible that the clearance is too large.

Therefore, as a countermeasure against this problem, it is recommended to form a journal bearing part 11 on the output shaft 2 and reduce the radial clearance (backlash) between the inner hole 6 of the input shaft 1 and the output shaft 2, as shown in FIG. .

In addition, as a distantly related measure for the same purpose, as shown in Figure 3, the above-mentioned output pilot bearing 7
In addition to this, it is also conceivable that two bearings of another pilot bearing 12 support the output shaft 2 so as to be rotatable relative to the inner hole 6 of the input shaft 1.

The journal bearing portion 11 and the roller-shaped pilot bearing 12 are arranged at positions corresponding to an input gear 14 formed on the input shaft 1 and meshing with a counter gear (not shown).

As described above, this invention arranges the input bearing and the output pilot bearing on one plane perpendicular to the axes of the input shaft and the output shaft, and furthermore, the input shaft in which the output pilot bearing is incorporated By incorporating a bearing part that closes the radial clearance between the inner hole of the input shaft and the outer circumference of the output shaft, it is possible to suppress the vibration of the output shaft due to the vibration of the input shaft in the radial direction, thereby reducing the vibration of both shaft systems. The accompanying problems can be prevented.

Furthermore, in this invention, the bearing part that closes the radial clearance between the inner hole of the input shaft and the outer periphery of the output shaft is arranged in correspondence with the position of the input gear on the input shaft. Since the load in the radial direction due to engagement with the output shaft can also be borne by the output shaft, the rigidity of this portion can be increased and the above-mentioned vibration suppression function can be further improved.

[Brief explanation of drawings]

The drawings show an embodiment of this invention. Fig. 1 is a schematic diagram showing the support structure for the input shaft and output shaft of a gear transmission, and Fig. 2 shows the main parts of the support structure shown in Fig. 1. FIG. 3 is a sectional view showing different embodiments in the same state as FIG. 2. 1...Input shaft, 2...Output shaft, 4...Input bearing, 7...Output pilot bearing.

Claims (1)

[Scope of utility model registration request] In a transmission in which an input shaft and an output shaft are rotatably supported coaxially with respect to a transmission case, an input bearing rotatably supports the input shaft with respect to the case, and a rear end of the input shaft. The output pilot bearing, which supports the front end of the output shaft so that it can rotate relative to the inner hole formed in the axis of the shaft, is placed on a plane perpendicular to the axes of both shafts. Vibration of a gear transmission characterized in that a bearing portion is formed on the input shaft at a position of the input gear meshing with the counter gear to close the radial clearance between the inner hole of the input shaft and the outer periphery of the output shaft. Prevention structure.