JPS623572Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration isolation structure for a transmission.

[Prior art]

Generally, various vibrations (meshing vibration, rattling vibration, etc.) are generated in the meshing parts of gears inside the transmission, and are mainly transmitted from the shaft to the intermediate date plate via the bearing. The sound is further transmitted from the intermediate date plate to the transmission case and extension housing, and is emitted into the surroundings from the surfaces thereof as sound. However, a gasket is sandwiched between the intermediate day plate and the transmission case and the extension housing to prevent leakage of lubricating oil, and the intermedia day eight plate and
Direct metal contact with the transmission case and extension housing is avoided.

The above conventional vibration isolation structure will be explained in detail with reference to FIGS. 3 and 4. The intermediate day plate 1 is fastened between a transmission case 4 and an extension housing 5 with bolts (not shown) via gaskets 2 and 3.
Further, a first knock pin 6 is inserted into positioning holes 4a, 2a, and 1a formed in the transmission case 4, gasket 2, and intermediate date plate 1, respectively.
The transmission case 4 and the intermediate date plate 1 are positioned by a knock pin 6. moreover,
A second knock pin 7 is inserted into positioning holes 5a, 3a, and 1a formed in the extension housing 5, gasket 3, and intermediate date plate 1, respectively. The housing 5 and the intermediate date plate 1 are positioned.

[Problem that the invention attempts to solve]

However, since the intermediary date plate 1 and the transmission case 4 and the intermediary date plate 1 and the extension housing 5 are provided with positioning knob pins 6 and 7, the intermediary date plate 1 and transmission case 4
The extension housing 5 was in metal contact at this portion, and vibration was transmitted thereto. Therefore,
Even if a gasket with improved anti-vibration ability was developed, the overall effect was small.

If the knock pins 6 and 7 are made of an elastic material that deforms elastically in response to vibration force, it is possible to prevent noise caused by vibration. However, knock pin 6,
Since the function of No. 7 is positioning, there was a problem that the original positioning function would deteriorate if it was made of an elastic material that deforms elastically.

The purpose of this invention is to reduce the vibration transmitted from the intermediate date plate to the transmission case and extension housing without reducing the original function of the positioning dowel pin, and to reduce noise. It provides an anti-vibration structure.

[Means and actions to solve the problem]

In the present invention, a dowel pin for positioning is provided with a core made of a wear-resistant material and an outer sheath made of a vibration-proofing material, and a part of the core is penetrated through the outer sheath and exposed to the outside. By forming it so as to come into contact with the inner surface of the positioning hole together with the cover, the core maintains the positioning function of the dowel pin, and the outer cover reduces transmitted vibration and reduces noise.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of the vibration isolation structure according to the present invention. The knock pins 6, 7 are made of a wear-resistant material and have core bodies 6a, 7a and outer covers 6b, 6c, 7.
b, 7c. Core bodies 6a, 7a
is for maintaining the function as a positioning member material of the knock pins 6 and 7, and is exposed to the outside at a position that divides the outer cover into two parts, and is
positioning holes 4a, 2a, 1 along with c, 7b, 7c
a, 5a, 3a, and 1a so as to come into contact with the inner surfaces thereof. The dimensions of the externally exposed parts of the cores 6a and 7a are one-third of the total length of the knock pins 6 and 7.
The following is desirable to ensure noise prevention.

The outer coverings 6b, 6c, 7b, and 7c are made of anti-vibration metal (a metal that has very high internal friction, absorbs vibration energy well, and is useful for preventing vibrations and noise from machines or structures.) It is made of a material that has an anti-vibration effect, such as a synthetic resin material. This structure is configured to suppress vibration transmission from the intermediate day plate 1 to the transmission case 4 and the extension housing 5.

With the above configuration, the knock pin 6,
7 through the positioning holes 4a, 2a, 1a and 5a, 3
a, 1a, the wear-resistant material cores 6a, 7
The function of the positioning member is reliably achieved by the function of the exposed portion a, and vibration transmission is reduced by the vibration-proof outer coverings 6b, 6c, 7b, and 7c. In addition, as shown in FIG. 1, the core body 6
By arranging the exposed portions of a and 7a to face the gaskets 2 and 3, it is possible to almost prevent even the slightest vibration from being transmitted by the exposed portions.

In addition, in this embodiment, the outer coverings 6b, 6c, 7
b and 7c are formed into a ring shape as shown in FIG. Furthermore, the core bodies 6a, 7a
In order to prevent slippage in the rotational direction between the outer covers 6b, 6c, 7b, and 7c, protrusions 6 are provided on the sides of the cores 6a and 7a.
a', 7a', and the outer cover 6b, 6c, 7b, 7c
Grooves 6b', 6 into which the protrusions 6a', 7a' fit
c', 7b', and 7c' are provided. Such a configuration has the effect of further improving wear resistance by preventing slippage.

[Effect of idea]

According to this invention, a part of the core body constituting the knock pin abuts against the inner surface of the positioning hole, so the positioning function of the knock pin is maintained, and the outer cover attenuates vibrations, so noise can be reduced. Furthermore, the wear-resistant core body improves the durability of the knock pin compared to a knock pin made of only vibration-proof material, so noise can be reliably prevented for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing the vibration isolation structure according to the present invention, Fig. 2 is an exploded perspective view of the main part, and Fig. 3 is a sectional view of the main part of a transmission with the conventional vibration isolation structure. , FIG. 4 shows an enlarged sectional view of section A in FIG. 3. 1... Interme day eight plate, 2,
3...Gasket, 4...Transmission case, 5...Extension housing, 6...
...first knock pin, 7...second knock pin,
6a, 7a... Core body, 6b, 6c, 7a, 7c...
...Entegument.

Claims (1)

[Scope of utility model registration request] A knock pin that interposes a gasket between the intermediate day plate and the transmission case and the extension housing, and also positions the intermediate day eight plate and the transmission case, and the intermediate day eight plate and the extension housing. A core body made of a wear-resistant material is covered with an outer sheath made of a vibration-proofing material, and a part of the core body is penetrated through the outer sheath and exposed to the outside, and is attached to the inner surface of the positioning hole together with the outer sheath. A transmission vibration isolation structure characterized by being formed so as to abut against each other.