JPS58122226A - Mounting device for power unit - Google Patents

Abstract

PURPOSE:To absorb the micro vibration causing the confined sound in a mounting device by equipping the extension-rod which makes the volume being inserted or removed into or from the first chamber accompanied by piston movement to be almost equal to the volume of a piston rod being inserted or removed into or from the second chamber. CONSTITUTION:An elastic body 23 does not receive repulsing force such as in the time when high pressure gas is enclosed in the part of an air-chamber 36, because one end of a main body 35 becomes on air-chamber 36 in the case of the buffer rod mechanism 21 defining a mounting device. Consequenly, the widths delta of grooves 31, 32 may be caused to be small, and the force smaller than determined value input into the buffer rod 21 may be set to a small value by the relative displacement between a car-body and a power unit. Further, as arcs 27-30 and grooves 31, 32 defining air gaps 25, 26, are arranged on the same circumference, the direction of the force inputted into the buffer rod 21 becomes the direction intersecting the plane in which the elastic body 23 is positioned. Even if torsion is generated in the elastic body 23, the widths of the grooves 31, 32 are not changed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power unit mounting device, and more particularly to a power unit mounting device equipped with a buffer rod used for sub-mounting the power unit.

As a conventional power unit mounting device,
For example, there are those shown in FIGS. 1 and 2. In FIG. 1, (1) is the body of an automobile, for example, a pair of cross members extending in the vehicle width direction, and these cross members (1) are side members extending in the front direction of the automobile. (
2) are linked to each other. (31 is a mount member bridged to the cross member (1), and a pair of mount brackets (4) are attached to this mount member (3). (5) shows the power unit;
The Kono power unit (5) is connected to the side member (2) via a mount bracket (6), and to the mount bracket (4) via an insulator (7).
Each is supported. Destroyed power unit (5)
prevents muffled noise when driving at medium speeds and improves the power unit (
In order to increase the rigidity in the roll direction (5), it is connected to the mount bracket (4) from the front and rear directions via a pair of buffer rod mechanisms (8). That is,
As shown in detail in FIG. 2, the buffer rod mechanism (8) includes a rod (9), an outer cylinder (fl llj old) fixed to both ends of this rod (9), and this outer cylinder f+01F.
Cylindrical elastic body crimped on the inner surface of i11 +121 +1
31, and a cylinder +141 (15+) which is press-fitted into the inner surface of the elastic body f121()31.
4+ is the power unit) (The bracket provided in 51 is connected to the bolt (+71), and the cylinder (1
51 is a bolt (181) attached to the mount bracket (4).
It is connected by. Further, a gap (19) is formed in the elastic body (12).

Therefore, in such a power unit mounting device, the slight vibration of the power unit (5) that causes muffled noise is absorbed by the elastic body i121i1 :(+, and the roll of the power unit (5) is
I! 1 is crushed and is suppressed by the link action of the buffer rod mechanism (8).

However, in such a conventional power unit mounting device, the buffer rod mechanism (8)
The elastic bodies ++21 and +131 are connected by a rod (9), and since the impact was absorbed only by this elastic body f1211131, the power unit l-(5+ When a constant torque is applied to a:, the air gap ++s++ of the elastic body (12) is completely collapsed, preventing muffled sound/sufficient spring (l has a point, on the other hand, There was also the problem that the power unit (51) moved horizontally in the longitudinal direction of the vehicle during sudden acceleration or deceleration, resulting in a jerky movement.

This invention was made focusing on the above problems,
A pair of elastic bodies are respectively identified to the pivot body and the power unit, and a gap is formed in at least one of the elastic bodies, and a yoke absorber is interposed between these elastic bodies. A body that is connected and is filled with an incompressible fluid and has a cylinder hole, and a body that is slidably housed in the cylinder and divides the cylinder hole into a first and second chamber, and a piston formed with an orifice connected to a chamber; a piston rod having one end lpψu1 on one end surface of the piston protruding from a second chamber and connected to the other elastic body; Sengen 1 connected to the end surface protrudes from the first chamber to the outside of the 7th ring, and the volume inserted into and removed from the first chamber as the piston moves is approximately equal to the volume of the piston rod inserted into and removed from the second chamber [ 7 extension rods,
It is an object of the present invention to solve the above problems by providing a power unit mounting device having the following.

Hereinafter, this invention will be explained based on the drawings.

FIG. 3 is a diagram showing an embodiment of the present invention, in which (1) is a pair of cross members extending in the vehicle body, for example, the width direction of the vehicle, and these cross members (1) are located at the front and rear of the vehicle. They are each connected to the zyte members (2) extending in the force direction. (3) is a mount member bridged to the cross member (1), and this mount member (3)
A pair of mounting brackets (4) are attached to the. (5) indicates a power unit, and this power unit (51) is supported from the front Yoshiki side member (2) in the vehicle width direction via a mount bracket (6), and is mounted in the mount bracket (4) in the width direction of the vehicle. The power unit (5) is supported from the front and back directions via the regulator (7).The power unit (5) is also supported in order to prevent muffled noise during medium speed driving and to increase the rigidity of the power unit (5) in the roll direction. mount bracket (4) via a pair of buffer rod mechanisms (21) from the front and rear directions.
) is connected to. This buffer rod mechanism (21)
As detailed in Fig. 4, the power unit (5) has one
1. An inner cylinder (22) with a fixed inner circumference and an inner cylinder (22) with an inner peripheral surface
Cylindrical elastic body (23+ and elastic body +2:
(an outer cylinder (24) glued to the outer peripheral surface of the elastic body +231), and a gap 1' (24) is formed in the elastic body +231.The gap j251 (26) is a circular hole (
27 (2R'l and 129j j:11 and circular hole (2
7) (28) and +291 f30+, respectively. The center line of the elastic body (2:s+) is located on the circumference of a circle drawn around the center of the elastic body (2:s+. One piece each may be formed.The outer cylinder (24) is connected to one end of the main body (33), and this main body (33) has a space opening at the other end.The main body (33) Rod guides C341351 are fixed at a predetermined distance H1 from each other, and these front guides C (, 11C35+) define a space between an air chamber (31i1) and a cylinder hole (371, filled with non-If contractile fluid). Air chambers (36
) is in communication with the atmosphere through a communication hole C381 formed in the main body (331), and the cylinder hole (371 is further connected to a piston (by the time) a piston (4u) slidably housed in the 7th cylinder hole t37+. ) and a second chamber (41).An orifice is formed in the field that communicates the first chamber (40) and the second chamber (41), and this orifice ( (m) is formed by a hole (42) of a predetermined diameter provided in the piston (39).On the surface facing the piston (3! [43H
I++ is completely stuck and the ton rod (45) and extension rod (4G) are fixed. That is, it has a piston rod (451 is a large diameter part 147) and a small diameter part (481) in which a thread is formed, and this small diameter part (48) is a piston rod (451 is a large diameter part 147 formed at the same time as the piston rod) It passes through a hole with an inner diameter and is screwed onto an extension rod 146) having an outer diameter approximately equal to that of the large diameter portion (47).From the tip of the extension rod (46), a piston t,
>91-z distance is the piston of the stopper (43) (
39) to the bottom surface (33a) of the main body (33)
Since the distance is shorter than the distance at t, the piston (39) is stopped.
(43) Even when it comes into contact with the extension rod (
The tip of 46) does not come into contact with the main body t:(31).

(49+ aft) are seal members held by the rod guide C341 (351), and these seal members (491150) prevent the oil in the first and second chambers (401 (411) from leaking from the cylinder hole +371. Therefore, these seal members +491 (50) resist the flow of fluid caused by the piston (39) sliding inside the cylinder hole (371) while allowing limited flow of fluid through the orifice. It is sufficient to prevent fluid leakage, and a low-pressure oil rule is sufficient.The tip of the piston rod (451 protrudes through the second chamber +411 and is connected to the outer cylinder e'i13, and the outer cylinder (5+1 is a cylindrical It is connected to the inner cylinder 63 via the elastic body (521).This cylinder (53) is connected to the aforementioned mount bracket (41).
is fixed.

In addition, there is an air chamber (instead of the atmosphere in 361)...
Hole 1381k10 may be closed and low pressure gas may be sealed.

Next, the operation (C) of the power unit mounting device configured as above will be explained.

When a force below a certain value is input to the buffer rod mechanism 011 due to relative movement between the vehicle body (1) and the power unit (5), the elastic body (23) is elastically deformed and the air gap +25
1 (26+) is deformed. Therefore, the rigidity of the buffer rod mechanism (21j) is low, causing slight vibration due to the idle link of the power unit or low during medium speed driving.

It is possible to prevent muffled frequencies from occurring inside the vehicle. The buffer rod mechanism (in the case of 21j, the main body (33
) is an air chamber (36), so the elastic body 1231 does not receive the reaction force of the gas unlike when the air chamber (31i1) is filled with a high pressure gasket.As a result, the groove 1311c is closed. It is also possible to reduce the width (δ) of 2 and set the above-mentioned constant value to a small value.

Furthermore, the circular hole (
271+'21'! l (291 (301 O, J: Groove! 3 + IC421 are arranged on the same circumference, so the direction of the force input to the buffer rod 4'A structure (21 +) is the elastic body (2: (+ is located The direction intersects the plane, and even if the elastic body (23) undergoes torsional deformation, the groove f'(
The width (δ) of II (321) does not change significantly.

Next, when a substantially constant force is input to the buffer rod mechanism (21), such as when the vehicle is on a slope or when slow acceleration/deceleration, the air gap! ? 5) Before i261 collapses, the piston (3!11) starts sliding in the cylinder hole (37). As a result, the rigidity of the buffer rod mechanism (21) can still be kept low. , it is possible to completely prevent the occurrence of low-frequency muffled noise in the vehicle interior.The buffer rod mechanism (which constitutes the mounting device according to the present invention)
2] 1+dAs mentioned above/further member+49) Since a low-corrosion oil seal can be used for t5o+, it is possible to reduce the frictional force generated between these seal members (49) (50) and the piston rod (45). This prevents the screws and rods from sticking due to friction. 'Material, piston rod (= 151 and extension rod [4G + h front guide (341 (
351, it can be supported by the main body t331 with a long span, so even if a force is applied to the piston rod (45) in a direction other than its axial direction, the piston rod f+1
51 and the extension rod (46), it is easy to prevent bending and deformation, and fluid leakage can be prevented.

Furthermore, as the piston (') slides, the piston rod (
45) Or even if the extension rod (46) is inserted or removed, the volumes of the piston rod (45) and the extension rod (46) that are removed at t11i are approximately equal. Therefore, the inside of the first chamber +401 or the Iri second chamber (41) will not become negative, and air will not be sucked into the d~1 chamber (all or the second chamber 1 old).

Next, in response to an input due to sudden torque fluctuations such as when a vehicle suddenly accelerates or decelerates, fluid flows through the hole (42) in the opposite direction to the moving direction of the piston/(391), causing a damping force. As a result, the force input to the buffer rod i (2) IK is consumed, and the vibration transmitted through the buffer rod mechanism +211 is absorbed.

Next, in response to a large input such as when the axle suddenly starts, the gap in the elastic body (23)! 251 (26+ is not only crushed by Vfl, but also the piston f39) also comes into contact with the stopper t431 or (44), and the rigidity of the buffer rod mechanism 21j is significantly improved.As a result, the displacement of the power unit (5) due to large input is suppressed. It is possible to suppress it to a predetermined value or less.

The orifice may be made smaller than the inner diameter of the cylinder hole (37) with an outer diameter of 3 liters, and may be configured with a gap drawn between them. It is possible to reduce the total dynamic resistance.

In addition, in order to reduce the sliding resistance with the cylinder hole +37),
It is optional to include a piston ring around the outer circumference of the piston (39). Even older, stopper (4:31F4
41 can be attached to the left and right surfaces of the piston (39) to obtain the same effect.

As described above, according to the present invention, the power unit mounting device includes the entire vehicle body and the power unit [a pair of elastic bodies each fixed to the other with a gap formed in at least one side, and a shock absorber interposed between these elastic bodies. , <, the shock absorber is connected to one elastic body, the body is formed with a cylinder hole filled with incompressible fluid, and the cylinder hole is slidably housed in the cylinder hole. A piston is formed with an orifice that divides it into first and second chambers and communicates the first and second chambers, and one end of the piston is formed on one end surface of the piston, and the other end protrudes from the second chamber. A piston rod is connected to each body, and one end is connected to the sacrum end of the piston, the other end projects from the first chamber to the outside of the cylinder hole, and the volume that is inserted into and removed from the first chamber as the piston moves is the first. Because the volume is approximately equal to the volume of the piston rod that is inserted into and removed from the second chamber, low-frequency muffled noises occur inside the vehicle even when a constant force is input to the power unit, such as when climbing or descending or during slow acceleration and deceleration. In addition, in response to input caused by rapid torque fluctuations such as during sudden acceleration/deceleration, the orifice generates a damping force due to fluid flow resistance, causing the power unit to move horizontally toward the rear of the vehicle body. This has the effect of preventing jerky vibrations.

[Brief explanation of drawings]

Figure 1 is a front view showing a conventional mounting device, Figure 2 is a front view showing a conventional mounting device;
The figure is a partial sectional view of the buffer rod mechanism shown in Figure 1.
FIG. 3 is a front view showing an embodiment of the mounting device according to the present invention, and FIG. 1 is a sectional view of the buffer lot mechanism shown in FIG. 3. (1)...Vehicle body (cross member) (5)...Power uniso) f2: 1l (5'l+.
...Elastic body +25) (26) ...Void (33)
...Body (main body) (37) ...Cylinder hole (3
9+...Piston (=Itl+・1st chamber (41)
...Second chamber (42), orifice (hole) (45)...Piston rod f-1[i]...Extension rod patent applicant
Nissan Motor Co., Ltd. Percentage Applicant Atsugi Automobile Parts Co., Ltd. Agent Patent Attorney Yuga Military − Department

Claims (1)

[Claims] A pair of elastic bodies are respectively fixed to the vehicle body and the power unit, and at least one of them has a 2N formed therein, and a shock absorber is interposed between these elastic bodies. Non! f A body in which a cylinder hole filled with contractile fluid has been formed; A piston with a continuous orifice formed therein, one end protruding from the second chamber and connected to the sacral elastic body, and one end protruding from the second chamber and connected to the sacral elastic body, and a piston rod with one end attached to the other wing surface of the piston. An extension whose other end protrudes from the first rod/outside the cylinder hole, and whose volume that can be inserted into and removed from the first chamber as the piston moves is approximately equal to the volume of the piston rod that is removed from the second chamber. rod and
A power unit mounting device comprising: