JPS5824034Y2 - Vibration isolator for crankcase covers - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a vibration isolator often used in engine crankcase covers.

Generally, a generator, a clutch, an oil pump, etc. are arranged on the side of the crankcase of an engine such as a two-wheeled motor vehicle, and a cover that covers these is attached directly or indirectly to the crankcase.

These crankcase covers are designed to prevent the transmission of vibrations caused by the operation of the machinery inside the crankcase, and to prevent noise from being amplified by the resonance of the flat head of the cover and being directed to the outside. A vibration isolator made of an elastic material is interposed on the mating surface with the crankcase.

These mating surfaces are formed in a shape that follows the periphery of the cover, but their width is often relatively narrow due to weight reduction and space considerations, so the vibration isolator cannot be placed on either side of the mating surfaces. Structure that keeps it from falling off,
For example, it is difficult to form a groove in the mating surface of a vibration isolator, so conventionally the vibration isolator was simply sandwiched between a case and a cover.

On the other hand, since the vibration isolator is a ring-shaped material made of thin rubber, etc., it is flexible and does not have a typical design. Therefore, when assembling the vibration isolator between the crankcase and the cover,
It is necessary to place a vibration isolator on one of the mating surfaces according to its shape, and then place the other one so as not to shift its position. This work is not only extremely troublesome, but also Even if it is installed, the vibration isolator easily slips from the mating surface when external force is applied. Therefore, covers that are frequently removed for adjustment require a lot of time to install the vibration isolator. There was the inconvenience of having to waste it.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and the object is to provide a vibration isolator that can be easily installed and is difficult to come off.

This invention provides a vibration isolator that is frequently used for crankcase covers, which is placed on the mating surfaces of the crankcase and covers that are attached directly or indirectly to the crankcase. It is formed into a band shape along the mating surface and is integrally provided with a reinforcing member whose shape matches the shape of the mating surface.This increases the regularity of the vibration isolator and makes it easy to install and remove. It's made easy to do.

An embodiment of the U downward design will be described with reference to the drawings.

Figure 1 is a plan sectional view showing a part of the crankcase with the vibration isolator according to the present invention attached, Figure 2 is a front view of the same crankcase with the oil pump cover removed, and Figure 3 is a front view of the crankcase with the oil pump cover removed.
The figure is a plan view showing the vibration isolator frequently used for a crankcase cover according to the present invention, and FIG. 4 is an enlarged sectional view taken along the line IV--IV in FIG. 3.

As shown in the figure, there is a mating surface between the crankcase cover side mating surface 3 of the crankcase cover 2 of the crankcase 1 and the oil pump cover side mating surface 5 of the oil pump cover 4 to be attached here. A vibration isolator 6 having a shape that follows the shape is sandwiched 1.

As shown in FIG. 4 in cross section, this vibration isolator 6 has a reinforcing member γ integrally provided at a stepped portion 6A that matches the stepped shape of the oil pump cover side mating surface 5.

This reinforcing member T is made by fixing a plate-shaped material such as a cold-rolled steel plate to a position that does not affect the spring constant of the vibration isolator 6 in the height direction using a method such as vulcanization adhesion, and its planar shape is ,
The shape of the mating surfaces of the crankcase cover 2 and oil pump cover 4 is made to match.

In the figure, 8 is the oil pump, 9 is the oil pump cover 4
The mounting screws for tightening the crankcase cover 2 to the crankcase cover 2 are shown.

There are three mounting screws 9, and the collar 1 is inserted into three cylindrical bosses 10 formed on the oil pump cover 4.
1, and its tip is screwed into a boss portion 12 on the crankcase cover 2 side.

Reference numeral 13 in the figure indicates a vibration-proofing rubber disposed between the washer 14 and the cylindrical boss portion 10.

Note that a space S is formed between the crankcase cover 2 and the oil pump cover 4 with a vibration isolator 6 sandwiched therebetween, so that even if the oil pump cover 4 vibrates relative to the crankcase cover 2, there is no mutual interference between the crankcase cover 2 and the oil pump cover 4. collision is avoided.

Further, reference numeral 15 in the figure indicates a center cover, and this center cover 715 is circular and surrounded by a pair of annular vibration isolators 1 that sandwich the flange 16 on the crankcase cover 2 side.
T and 18 are attached by caulking.

In the above embodiment, the reinforcing member 1 is attached along the stepped portion 6A of the vibration isolator 6, but this is attached along at least one of the mating surfaces and in the height direction of the vibration isolator 6. It may be of any type as long as it does not change the spring constant, and therefore the shape and attachment shown in FIG. 5 or 6 may be the same.

In addition, the mating surface is usually a continuous annular shape that follows the periphery of the cover, but if there is a cut in the mating surface, it is sufficient to have a shape that follows this mating surface, so it does not necessarily have to be annular. .

Furthermore, although the above embodiment has an oil pump cover attached to a crankcase cover, the present invention is applicable to all types of covers that are attached directly or indirectly to a crankcase.

As described above, this invention provides a vibration isolator that is frequently used as a crankcase cover, which is placed on the mating surfaces of the crankcase and covers that are attached directly or indirectly to the crankcase. A reinforcing member that is formed in a band shape in the direction along the mating screen at the contact position and has a shape that matches the shape of the mating surface is integrally provided, so that the vibration isolator matches the planar shape of the mating surface by the reinforcing member. Since the vibration isolator is provided with a regular ratio that gives the shape, it will not easily shift when the vibration isolator is attached to the mating surface, so it has the excellent effect that it can be added in a short time.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view showing a part of a crankcase to which the crankcase cover frequently used vibration isolator according to the present invention is applied, Fig. 2 is an original drawing of the same crankcase with the oil pump cover removed; 3 is a plan view showing an embodiment of the vibration isolator according to the present invention, FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 3, and FIGS. 5 and 6 are the vibration isolators according to the present invention. FIG. 5 is a cross-sectional view similar to FIG. 4 showing another embodiment of the body; 1... Crank case, 2... Crank case cover, 3... Crank case cover side mating surface, 4... Oil pump cover, 5...
...Oil pump cover side mating surface, 6...
Vibration isolator, 7...Reinforcement member.

Claims (1)

[Scope of utility model registration request] In a vibration isolator that is often used as a cover for the crankcase and is placed on the mating surface of the crankcase and covers that are added directly or indirectly to the crankcase, the A vibration isolator often used in crankcase covers, which is integrally provided with a reinforcing member that is formed into a band shape in the direction along the axis and has a shape that matches the shape of the mating surface.