JPH0328199Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine mount, particularly an engine mount for industrial vehicles.

[Prior art]

8 and 9 show an engine mount used in an industrial vehicle such as a forklift vehicle. That is, as shown in FIG.
The rubber elastic body 1 is made up of a cylindrical end 11 with a protruding large-diameter end surface, and an inner cylinder 2 is provided through the axial center of the rubber elastic body 1, and an inner cylinder 2 is fitted onto the outer peripheral surface of the end 11 and formed at one end. An outer cylinder 3 having an L-shaped cross section is provided which supports the outer peripheral end face of the trapezoidal part 10 by means of a flange part.

As shown in FIG. 9, the engine mount includes a pair of the rubber elastic bodies 1 arranged so that the inner tubes 2 coaxially face each other and the outer tube 3 holds the vehicle body frame 9. The rubber elastic body 1 is sandwiched between washers 5a and 5b, and a support frame 6 for supporting the engine is stacked on the washers 5a, and a nut 8 is inserted from the tip of a bolt 7 passed through the inner cylinder 2.
It is installed by tightening the inner tubes 2 of both rubber elastic bodies 1 until they come into contact with each other. The engine is supported by the body via this mount. The protrusion 12
becomes a stopper that regulates the engine amplitude.

[Problems that this invention attempts to solve]

It is desirable for the engine mount to have a low spring constant in order to absorb engine vibrations and prevent vibrations from being transmitted to the body. However, especially in industrial vehicles such as forklift trucks, starting and stopping are frequently repeated, and moreover, sudden starts and stops are often performed, and if the spring constant of the engine mount is low, the engine may displace significantly when starting or stopping. Since there is a risk of interference with the body and the durability of the engine mount is also reduced, it is necessary to set the spring constant at a height that takes this point into account.

By the way, in the conventional engine mount structure mentioned above, the rubber elastic body deforms due to shear force when the engine vibrates, so the rigidity of the rubber elastic body must be considerably increased in order to obtain the necessary spring constant. At times, a large torque was required to tighten the inner cylinders 2 until they came into contact with each other, resulting in poor assembly workability.

Therefore, the purpose of the present invention is to provide an engine mount that reduces the tightening torque during assembly and provides the necessary spring constant after assembly, thereby solving the problems of the conventional engine mount. It is something.

[Means for solving problems]

As shown in FIGS. 1 to 3, the engine mount of the present invention has a trapezoidal portion 10 of a rubber elastic body 1.
is formed on the outer periphery of the first trapezoidal portion and is lower than the trapezoidal portion and has a smaller diameter than the support flange 31 of the outer cylinder 3. A second trapezoidal portion 102 and a third trapezoidal portion 103, which is formed on the outer periphery of the second trapezoidal portion and is lower than the trapezoidal portion and has approximately the same diameter as the support flange 31, are formed in a stepped shape. do.

Further, as shown in FIGS. 4 to 6, a pair of slots 14a and 14b may be formed through the rubber elastic body at axially symmetrical positions along the outer edge of the first trapezoidal portion 101.

[Effect]

When assembling the engine mount, when the nut 8 is tightened, the first trapezoidal part 101 is pushed in and the axial center of the rubber elastic body is deformed by shearing force, causing the inner cylinders 2 to come into contact with each other.

When an engine is mounted and the engine vibrates, the shaft center part is subjected to shearing force, and the second trapezoidal part 10 on the outer periphery
2 is deformed by compressive force. When the amount of deformation of the shaft center portion and the second trapezoidal portion 102 reaches a predetermined amount, the engine is further received by the third trapezoidal portion 103, and the third trapezoidal portion 103 acts as a stopper.

As a result, the spring characteristics of the engine mount are 7th
It becomes nonlinear as shown by line A in the figure. Note that line B relates to a conventional engine mount, and the engine mount of the present invention can reduce the tightening torque during assembly and make the spring constant at an appropriate level during engine vibration.

Furthermore, by forming the slots 14a and 14b in the rubber elastic body, the necessary spring constant can be ensured and the tightening torque can be further reduced.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

In a first embodiment shown in FIGS. 1 to 3, the engine mount includes a pair of rubber elastic bodies 1. As shown in FIGS. The rubber elastic body 1 consists of a trapezoidal part 10 having a truncated conical shape as a whole, and a cylindrical end part 11 protruding from the center of the large diameter end surface of the trapezoidal part 10.
An inner tube 2 is installed through the axis of the tube. Further, an outer cylinder 3 is provided on the outer periphery of the end portion 11 and is fitted thereto and supports the end surface of the trapezoidal portion 10 with a flange portion 31 formed at one end.

The trapezoidal portion 10 includes a first trapezoidal portion 101 surrounding the inner cylinder and a first trapezoidal portion 1 sequentially from the other end surface side.
A second trapezoidal part 102 concentrically surrounding 01
A third trapezoidal portion 103 is formed in a stepped shape concentrically with and surrounding the second trapezoidal portion 102 . 1st
The diameter of the trapezoidal portion 101 is approximately the same as or slightly smaller than the diameter of the cylindrical end portion 11, the diameter of the second trapezoidal portion 102 is slightly smaller than the diameter of the flange portion 31 of the outer cylinder 3, and the diameter of the third trapezoidal portion 103 is slightly smaller than the diameter of the flange portion 31 of the outer cylinder 3. The diameter of the flange portion 31 is approximately the same as the diameter of the flange portion 31.

As shown in FIG. 3, the rubber elastic body 1 configured as described above is arranged so that the cylindrical end portions 11 of the pair thereof face each other, and the outer tube 3 is sandwiched between the circular holes formed in the body frame 9. A washer 5b is mounted on the lower surface, and a washer 5a and an engine support frame 6 are mounted on the upper surface.
The engine mount is installed by passing the bolt 7 through the inner cylinder 2 while applying the bolt 7, and tightening the nut 8 from the tip until the inner cylinders 2 touch each other, and the engine is supported by the engine support frame 6. .

In the engine mount having the above structure, the shaft center of the nut 8 moves so that the inner cylinders 2 come into contact with each other, and the difference between the first trapezoidal part 101 and the second trapezoidal part 102 is h ₁
= O (Figure 6). In this case, only a shearing force acts on the shaft center portion provided with the inner cylinder 2 (deflection h ₁ in FIG. 7).

Next, the engine is placed on the support frame 6 (deflection e).

When the engine operates and vibrations are input to the engine mount due to the start or stop of the vehicle, the shaft center portion and second trapezoidal portion 102 of the rubber elastic body 1 deform to alleviate the vibrations. In this case, a shearing force acts on the axial center portion, and a compressive force acts on the second trapezoidal portion 102 (deflection h ₂ ).

The second and third trapezoidal parts 10 have a large vibration force.
When the difference h=O of 2,103, the engine is further supported by the third trapezoidal part 103, and the third trapezoidal part 103 plays the role of a stopper and prevents the deformation of the rubber elastic body 1. prevent.

As described above, the spring characteristics of the engine mount of the present invention are nonlinear as shown in FIG.

In contrast, in the conventional engine mount shown by line B, the spring characteristics change continuously. As a result, with the mount of the present invention, it is possible to use a relatively small tightening torque when tightening, and to exert a spring constant of the required height during use. Further, the spring constant during use can be set to a predetermined value by adjusting the ratio of shear force to compressive force.

FIGS. 4 to 6 show a second embodiment, in which a pair of slots 14a and 14b passing through the rubber elastic body 1 are provided at axially symmetrical positions along the outer periphery of the first trapezoidal portion 101 of the axis. It is characterized by the fact that it has been formed.
That is, especially as shown in FIG.
4b, and these slots 14a, 14
A third trapezoidal portion 103 is formed on the outer diameter side of b. Further, a second trapezoidal portion 102 is formed on the front and rear sides (upper and lower sides in the figure) of the first trapezoidal portion 101 .
The slots 14a and 14b are located inside the cylindrical end 11 of the rubber elastic body 1.
FIG. 5 is a sectional view of the rubber elastic body 1, and FIG. 6 is a sectional view of the assembled state. Portions corresponding to the first embodiment are designated by the same reference numerals.

However, in this embodiment, since the first trapezoidal part 101 is separated from the third trapezoidal part 103 by the slots 14a and 14b on the left and right sides, it is possible to further reduce the tightening torque when assembling the engine mount. can.

When a vehicle starts or stops, shocks are applied to the engine mount in the front and rear directions. On the other hand, the engine vibrates laterally during operation, and vibration force is input to the engine mount in the left-right direction. However, if the engine mount of this embodiment is installed with the slots 14a and 14b facing each other in the left-right direction of the vehicle, the engine mount will have a low spring in the lateral direction and absorb engine vibrations, and Since compressive force is applied to the engine, it becomes a high spring, effectively suppressing the displacement of the engine during sudden starts and stops.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a plan view of a rubber elastic body, and FIG.
The figure is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view of the engine mount using the rubber elastic body shown in Fig. 1.
4 to 6 show a second embodiment of the present invention, in which FIG. 4 is a plan view of the rubber elastic body, FIG. 5 is a cross-sectional view taken along the line -- in FIG. Figure 4 is a sectional view of an engine mount using a rubber elastic body, Figure 7 is a diagram showing the spring characteristics of the engine mount of the present invention and the conventional engine mount, and Figure 8 is a half-sectional side view of a conventional rubber elastic body for engine mounts. , FIG. 9 is a sectional view of a conventional engine mount using the rubber elastic body of FIG. 1...Rubber elastic body, 10...Trapezoidal part, 101...
...First trapezoidal part, 102...Second trapezoidal part, 10
3... Third trapezoidal part, 11... Cylindrical end part, 14
a, 14b...slot, 2...inner cylinder, 3...outer cylinder.

Claims (1)

[Claims for Utility Model Registration] (1) A rubber elastic body consisting of a cylindrical end projecting from the center of a trapezoidal part and its large-diameter end face and having a smaller diameter than the end face has an inner cylinder extending through its axis. An outer cylinder having an L-shaped cross section is provided which fits onto the outer periphery of the cylindrical end and supports the end surface of the trapezoidal part by a flange formed at one end. In the engine mount, the trapezoidal portion is formed by a first trapezoidal portion having a diameter substantially the same as or smaller than the cylindrical end portion, and an outer periphery of the first trapezoidal portion. a second trapezoidal part formed on the outer periphery of the second trapezoidal part and lower than the trapezoidal part and having a smaller diameter than the flange part; An engine mount characterized by having a stepped trapezoidal shape consisting of a trapezoidal part. (2) The rubber elastic body is provided with a pair of slots extending through the rubber elastic body in the thickness direction along the outer edge of the first trapezoidal portion at axially symmetrical positions.Claim 1 of the Utility Model Registration Claim Engine mounts listed.