JPS60175833A - Mounting device of power unit - Google Patents

Abstract

PURPOSE:To reduce transmission of vibration and noise, by parallelly arranging the first elastic member and the second elastic member, having in its intermediate part mass members, and providing a means which separates and connects some or the whole part of vibration transmitted in the second elastic member. CONSTITUTION:If the pressure in an air chamber 36 is decreased by actuating an air pressure control device 38, mass members 29 and 32 are integrally formed through damping rubber-state elastic members 33, 35 by action of the atmospheric pressure. Here a transmission route of vibration from a mounting member 20 in the side of a power unit to a mounting member 22 in the side of a supporting structure provides two channels comprising a route through the first elastic member 24 and a route of transmission from a rubber-state elastic member 28 to a rubber-state elastic member 31 via the mass members 29, 32. These rubber- state elastic members 28, 31, mass members 29, 32 and the damping rubber-state elastic members 33, 35 are used acting as the second elastic member.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to an improvement of a mounting device for elastically supporting a power unit on a support body, particularly a mounting device 1-1 that is provided with a light body in the middle portion. .

(Prior Art) As a mounting device in which a mass body is provided in the intermediate portion, a device described in Japanese Utility Model Application Laid-Open No. 58-7945 is known.

This apparatus will be explained with reference to FIG. Frame 1, 2
Ends of rubber-like elastic parts 4'A5 and 7, which are arranged in parallel with each other, are fixed to the mutually facing wall parts 3 and 4. The rubber-like elastic member 7 has a structure in which rubber-like elastic members 7a and 7b are connected at an intermediate portion via a mass portion 'lA8.

Reference numerals 9 and 10 indicate bolts for attaching the frames 1 and 2 to the power unit side or the support body side, respectively.

This mounting device is shown in FIG. 2 as a mechanical model. In FIG. 2, it is assumed that the frame l is attached to the power unit and the frame 2 is attached to the support, ko is the spring constant of the rubber-like elastic member 5, and kl is the rubber-like elastic member 7.
k2 is the spring constant of the rubber-like elastic member 7b, and m is the mass of the mass member 8. The force F transmitted from the frame l to the frame body 2 is expressed as follows: xo is the displacement of the frame l with respect to the frame 2, and x2 is the amount of change of the mass member 8 with respect to the frame 2.
Then, it is expressed by the following formula.

F - ko

Then, fo - ('Aπ)E ball, expressed as 2)/〒.

The characteristic that the frequency is 0 (j1 The force from the member 8 to the frame 2 is F.l, and the force transmitted from the mass member 8 to the frame 2 when the frame 1 is vibrated at a certain frequency is F. As shown in FIG. 4, at the resonance frequency f of the rubber-like elastic member 7, the excitation force exerted on the frame 2 is -11) larger, and at this resonance frequency f. The vibration phase reverses after . Therefore, the spring k parallel to the spring system of the mechanical model in Figure 3. In the state shown in Figure 2 with the addition of F = kox, + k2x
2, the peak of x2 is the resonance frequency f of the rubber-like elastic member 7. The 118 wave number of the excitation force applied to the frame 1 is f. It is a positive value when it is smaller than f.

・When it is larger, it becomes a negative value. Therefore, when the excitation frequency is 0, the force from frame body 1 to frame body 2 is F. When the frame 2 is expressed as when the frame 1 is vibrated at a certain frequency,
This is shown by a line passing through A, B, G, C, and D in FIG. Note that the vibration transmissibility of only the rubber-like elastic member 5 is A, G, and E.
The line passes through 5.

Therefore, the excitation frequency applied to the frame 1 is f. In the above case, the vibration transmissibility decreases by the amount indicated by diagonal lines in FIG. For this reason, the resonant frequency f of the rubber-like elastic member 7 is lower than the frequency of the problematic vibration of the power unit attached to this mounting. By setting G to a low value, it is possible to effectively reduce the vibration transmission force in the frequency range that is the gap between the power units.

However, in such a conventional power unit mounting arrangement fK1, vibrations smaller than the resonant frequency of the elastic member having a mass distribution S ratio in the middle are affected by A in Fig. 5.
As shown in , B, and G, there was a point where the vibration transmissibility deteriorated, especially immediately before the resonance frequency.

(Object of the Invention) The object of the present invention is to arrange such an elastic member in parallel with an elastic member that has a hole t4 in the middle in a mounting device ri with a hole λ in the middle. The object of the present invention is to improve the deterioration of the vibration transmission rate in the frequency range above the resonance frequency while taking advantage of the effect of reducing the vibration transmission force in the frequency range above the resonance frequency of the elastic member having the member.

(('i'f composition) of the invention) In order to accomplish this purpose in 4 parts, the power unit mounting device of the present invention, iT, has a first elastic member between the power unit side mounting member and the 4i body side mounting member. and a second elastic member for fixing the first member are arranged in parallel, and the above-mentioned Support body side mounting part moon i!t! + Yundatsu 1f,
゛1-)rt+s or all i? 19 is characterized in that it is provided with means for dissociating and binding 19.

(Example) The power unit mounting device of the present invention will be described in detail below with reference to the drawings.

FIG. 6 is a diagram showing an embodiment of the power unit mounting device of the present invention. First, the configuration will be explained by using a power unit side mounting member 20B and a bolt 21 for several power units (not shown). Vehicle body side mounting member 2
2 is attached to the vehicle body (not shown) using bolts 23. The first elastic member 24 has its lower end bonded to the vehicle body side mounting member 22 with baking powder, and its upper end bonded to the connecting frame 25 by baking powder. Connecting frame 25
J-.

(It-1 power unit side mounting member 20)
Attach with 26 and nuts 27. Also, connecting frame 2
5, the mass member 32 is supported by a rubber-like elastic member 28 which is a second elastic member. A rubber-like elastic member 83 for loosening is fixed in a convex shape on the mass member h1 member 32, and four parts 34 of a shape corresponding to this are formed on the surface facing the mass member 290. A rubber-like elastic member 35 for cushioning is provided to cover the four parts 34.
to fix. Support body side attachment part 22, rubber-like elastic member 2
4, tj13 binding frame 25, go A-shaped elastic 1rA (phase 28,
'L) i i, i member 29, rubber-like elastic member: 11,
The space surrounded by the air chamber 3 and the air chamber 3
6 and is connected to the air and F controller 88 through the conduit 37. The pneumatic control device 38 is connected to a control unit 39, and the control unit 39σ)
The actuation causes 1Bl- to pass through the air chamber 36 to atmospheric pressure or to negative pressure.

Each of these members forms a means for dissociating part or all of the 4/1 dynamic transfer function relationship that passes through the second elastic member and reaches the support side attachment member O.

Next, the operation of this mounting device will be explained.

Is Figure 6 air? This shows a state in which the ti s 6 is communicated with the atmosphere. At this time, the only path through which the vibration on the power unit side is transmitted to the support body side is through the first elastic member 24. Here, the attachment 1 of the air pressure control device 38 is
When the pressure in the air chamber 36 is reduced by step 1, the mass members 29 and 32 are brought together by the action of atmospheric pressure via the rubber-like elastic parts 88 and 35 for gradual insertion. At this time, the vibration transmission path from the power unit side mounting member 20 to the support body side mounting member 22 is; There are two routes, one that goes to No. 31. At this time, it can be assumed that the rubber-like elastic member 33.35 for i'l law (1) has a larger constant than the rubber-like elastic member 28.81, so there is no problem in considering the mass member 29.32 as one piece 'f(,17 '1.

These rubber-like elastic members 28, 81, mass member 29°82
, and the cushioning rubber-like elastic member 8; 3, 35 is the second
Acts as an elastic member. As a result, as in the conventional example described above, a spring made of only a rubber-like elastic member and a spring made of a rubber-like elastic member with a mass portion i=+ disposed in the middle are arranged in parallel to form a +Sr element.

Air pressure control 6111 device, air chamber 36 due to the operation G of 38
The pressure control within this mounting B'p [l
'J is used for a two-cycle 4-cylinder engine.' It makes sense that the second component of the engine's rotation is the noise, and the main component of the camera G is the frequency of the two-stroke component of the engine's rotation. ik is 28°Q[, z9. s2. From the material to the sound 1 of s5 - ~ 2 +
The +7:1 ratio of the 1lial member is the same when the members 20 and 82 are integrated, and when the resonance frequency is lower than the resonance frequency, the air chamber 86 is communicated with the atmosphere, and when the resonance frequency is higher than the resonance frequency, the air pressure in the air *86 is increased. The mass members 29° and 32 are integrated by lowering the angle. The resonance frequency when this second elastic member is integrated is f of 51iXl. Then, the characteristics of this mounting device ￥(゛) become a line passing through ACCD in FIG. 5, which is an improved characteristic of the portion ABC in FIG. 5 of the conventional mounting device 6 shown in FIG.

FIG. 7 is a diagram showing another embodiment of the present invention.

While the embodiment shown in Fig. 6 connects and releases two mass members using air pressure G, in this real shaft example, the second elastic member provided with one mass member and the power unit side mounting member are connected. The transmission of vibrations between the two is connected and released by a liquid and a valve.

In FIG. 7, for attachment to the power unit side, the member 40 is attached to the power unit (not shown) with bolts 41. The half-vehicle main side mounting member 42 is attached to the vehicle body (not shown) using a 4.8G bolt. First step, the lower end of the sex member 44 is baked and glued to the vehicle body side member 42, and the upper end is baked and glued to the connecting frame 45. The power unit side mounting member 40 is attached to the essence 45 with the bolt 46. This installation is done by connecting part G to the power unit side mounting member 40.
The end of the diaphragm 47 is held between the p-linkage frame essence. Furthermore, an auxiliary member 49 is attached to the fII connection frame essence using rubber-like elastic members 4 and 8, and one end of the mass member 5 is connected to this auxiliary member 4.9 via a rubber-like elastic member 50.
t +fK kA' 5 The other end of l is attached to the rubber-like elastic member 5
2 to the support side mounting member 42. These rubber-like elastic members 48, auxiliary members 4 and 9, rubber-like elastic members 5
0, quality (→ J member 51 and rubber-like elastic member 52 constitute a second elastic material. Frame 45, rubber-like elastic member 48, auxiliary r\1' = A 49, and diaphragm 47) The enclosed space is a liquid chamber 54, and a partition plate 5
5 partitions this liquid chamber 54 into two chambers 54a +' 54b, and these liquid chambers 5 are separated by a valve 56 provided on the frame 45.
Opens and closes communication between 4a and 54b. The valve 56 is driven to open and close by an actuator 57 controlled by a controller 58. As the actuator 57, a pneumatic actuator, a hydraulic actuator, an electromagnetic solenoid, or the like can be used. The side of the diaphragm 47 opposite to the liquid chamber 54 is attached to the power unit side using the member 40&
11 is traced to the atmospheric pressure through the two provided rock passage holes 40a.

Next, the operation of the mounting device L of this embodiment will be explained. When the valve 56 is open, that is, in the state shown in FIG. 7, there are two liquid chambers 54a partitioned by the partition plate 55.
, 54b are in communication, and in this state βt, 1... is the liquid chamber 54. The pressure at a is in communication with atmospheric pressure, and the power unit side mounting member 4: 4 from the power unit (not shown);
The pressure inside 4 does not change. For this reason, the member 48,
The vibration of the power unit that affects the second elastic member consisting of 4, 9, 50, 51, and 52 is only transmitted from the frame 45 through the rubber-like elastic part 4'l' 48, and the power unit's JIi ( Rubber-like elastic member 48 in the direction of motion
If the resiliency constant is made sufficiently small, the vibrations transmitted from here will be almost negligible, and 5 minutes of the vibration of the power unit will be due to the fact that the first elastic member 44 has no member in the middle. Only. - Next, when the communicating part between the valve 56 and the partition plate 55 is closed by actuating the actuator 57, the liquid chamber 54a is opened.

54b17) Communication is cut off with power unit) (+!It
The vibration of the power unit transmitted to the mounting part 4.0 is transmitted from the frame 45 to the liquid chamber 54a to form a rubber-like + pH property ff, 1≦
The power unit side mounting member 4.0, the frame body 45, the liquid chamber 54a, the rubber-like elastic member 48, and the auxiliary part assembly 49 move together, and the power unit side mounting member 48 and the auxiliary member 49 move together. -・, from the material 4o to the support (↑ to the I'll attachment member) = rtul i The path to reach is the first elastic part 4:
A. Passing through 44 and members 48, 49, 50, 51.52
There are two systems: one in the middle and one passing through a second elastic member having an H-branch member 51. In other words, when the valve 56 is opened, a vibration transmission path is created by only a rubber-like elastic member, and when the valve 56 is closed, a spring made of only a rubber-like elastic member and a spring made of a rubber-like elastic member with a mass member disposed in the middle are arranged in parallel. The configuration is as follows.

Valve 56 by actuator 57 as in the previous embodiment
As an example of control, this mounting device i'i is
Cycle 4. When used in a cylinder engine, the engine rotational two-stroke component becomes the main component of noise and vibration, so the controller 58 adjusts the frequency of the engine rotational secondary component one to the second one based on the engine rotational speed. Elastic member member 4
9, 5 (valve 5 when lower than the resonance frequency of 1, 51)
A command is issued to the actuator 57 to open 6,
Members 49, 5 (both 1, l...51 4Jii: When the frequency exceeds the frequency, a command is issued to the actuator 57 to close the valve 56 to IPI.

As a result, the common frequencies of members 49, 50, and 51 are set to f in FIG. Then, what is the mounting device for this example? The characteristic of t is a line passing through AGCD' in FIG. 5 as in the previous embodiment, and the same effect as in the previous embodiment can be obtained. In the embodiment shown in FIG. 7, the mounting member 20 is located on the power unit side and the mounting member 22 is located on the support body side, but the mounting member 22 is not limited to this, and the mounting F% i4'
It is also possible to set 22 on the power unit side and use the mounting member 20 as the support jlII+i.

(Effects of the Invention) As described in detail above, the power unit mounting device of the present invention arranges the first elastic member and the second elastic member having a mass member in the middle in parallel F7: L, at the frequency of the manually applied vibration. Accordingly, since a means for disassociating and coupling a part or all of the first elastic member transmitted through the second elastic member is provided, it is possible to use only the portion of the elastic member with a high vibration-proofing effect that has a material (it member) in the middle. Therefore, even below the resonant frequency of the @2 elastic member, the selective dynamic transmission rate does not deteriorate, and above the resonant frequency of the second elastic member, the vibration transmission force can be reduced, which is an advantage of an elastic member having a mass member in the middle. As a result, noise and vibration transmission from the power unit can be reduced in cars using this mounting device, and this also reduces cabin interior noise and vibration, improving the feeling of coming to the car. .Also, when the engine speed increases to a certain degree, the first elastic member and the second elastic member
The parallel support with the elastic member increases the spring constant, which also provides the advantage that the engine is less likely to shake while the vehicle is running.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the I'R'i configuration of an example of a conventional power unit mounting device, and Fig. 2 is;
A diagram showing the mechanical model of the mounting '4 file in figure i, 3rd centroid' Jt7j L in the middle, 1 Rubber supine part 4 without a member: Mounting device i'i with only A
σ) Diagram showing the mechanical model, Figure 2154 is a characteristic diagram for the 4i t++'< model in Figure 3, Figure 5 is the mounting device in Figure 1: □゛1
Characteristics of ゛ and mounting device i”+d of the present invention
-; Diagram showing 7 genders, No. 61; 4 is ai, -41111
q) - A diagram showing a 6° 1f configuration of an embodiment of the power unit mounting device R'f. FIG. 7 is a diagram showing another embodiment of the present invention. 1.2 = Frame body 8,4...Wall portions 5, 7.7a, 7b...Rubber-like elastic member 8...
Quality 41 parts 9. lO...Mounting with bolt 20...Power unit side mounting member 21...Bolt 22...Support side mounting 1s-Is
tJ28...Bolt 24...First elastic part 25...
・Connecting frame 26...Bolt 27...Nut 28...Rubber-like elastic member (second elastic fSl (absorbing) 29
...Main member 80...Frame 81...Rubber-like elastic member (second elastic part 2.32...
・Mass member 1.35...Rubber-like elastic member for cushioning (second elastic part)
34... Recessed portion 36... Air chamber, 37... Pipeline 88... Air pressure; Control device 39.
...Control unit 40...Some examples on the power unit side are member 4, Oa...
Through hole 41...Bolt 4.2...Support side mounting is done by member 43...Bolt 44...First neutral part 'A', A4.
5...M essence 46...Bolt 4.7...Diaphragm 4+8', 50.52...Rubber-like elastic member (second elastic part iron) 439...Auxiliary member 51...Quality 1i
Members 54, 54. a, 54=b...liquid chamber 55-partition 41so, 56...valve 57...actuator 5
8... Controller. Special W1: Applicant Nissan Reno Car I92 Type Rei Agent Patent Attorney Sugimura 11th ξ Hide Figure 1 Figure 5 F/FD (DB) Figure 6

Claims (1)

[Claims] 1. Power unit side mounting member and vehicle body side mounting t"tl
(Insert the first elastic part between J4 and the mass member in the middle.)
A second elastic member is arranged in parallel, and the second elastic member
means for separating and coupling a part or all of a vibration transmission relationship from the power unit side attachment member through the second elastic member to the support body side attachment member between the elastic member and at least one of the power unit side attachment member and the vehicle body side attachment member; A power unit mounting device characterized by having a ';-(.