JPS6330535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device disposed between a power unit and a vehicle body to regulate displacement of the power unit.

Generally, for vehicles equipped with an internal combustion engine,
As shown in FIG. 1, the power unit 1 including the engine body 1a is placed on the power unit support 2,
Further, a displacement regulating device 6 such as a buffer rod 4 and a roll stopper 5 arranged between the power unit 1 and the vehicle body 3 is arranged to regulate the displacement that occurs when the power unit 1 is operated. Such a displacement regulating device 6 tends to be used more often in horizontally installed power units 1 because roll displacement appears large and becomes a problem. As an example of the conventional displacement regulating device 6 mentioned above, the Nitsusan Service Bulletin No.
No. 445 (Nissan Motor Co., Ltd., published in October 1981)
As is known from, for example, FIGS. 2 to 5 show an example of the buffer rod 4, which has inner cylinders 7 and 7a in the center, and an elastic material on the outer periphery of the inner cylinders 7 and 7a. Rubber members 8 and 8a are provided, and the inner cylinders 7 and 7a and the rubber members 8 and 8a are integrated by vulcanization adhesion or the like, and the rubber members 8 and 8a are
A bracket 10 constituting the outer cylinder parts 9 and 9a is attached to the outside of the rubber member 8 and 8a to fix the rubber members 8 and 8a.

The rubber member 8 has a pair of constant clearances 8c.
is provided, and the spring constant during deformation is made variable. That is, the above buffered 4
In this case, the characteristic shown by the solid line A in Fig. 7, that is, the force P
When the force P is small and the displacement δ is small, the spring constant is made small so as not to transmit engine vibration and noise to the car body (bold line part A'), and when the force P becomes large, a nonlinear spring is used to stop the engine movement. The main focus is to obtain characteristics that increase the constant. The former state, that is, the state corresponding to thick line A, is when the engine is stopped while running at idle, or when the vehicle is running at a constant speed.The latter state, that is, the state that corresponds to thick line A is when the vehicle Refers to cases where the engine is rolling due to excessive torque during acceleration or deceleration, or cases where the engine is shaking while driving on a rough road. In any of the above conditions, the buffer load 4
has the effect of regulating the movement of the power unit 1 and has the function of increasing running stability. 6th
The figure shows an exploded perspective view of the above components.

However, in the case of such a conventional displacement regulating device for a power unit, the rubber member etc. as an elastic material moves while being in contact with the holding member that is in contact with the rubber member. Due to the coefficient of friction of the rubber member itself, engine vibrations are transmitted to the vehicle body, and the steering wheel or floor may vibrate, which may have an adverse effect on the driver or fellow passengers. That is, the area surrounded by dotted lines E and E in FIG. 5 is the rubber member 8 and the bracket 1.
When the rubber member 8 absorbs the rocking or vibration generated in the outer cylinder part 9 and the inner cylinder 7, the rubber member 8 and the outer cylinder part at the contact part are in contact with each other. Since there is frictional resistance between the rubber member 9 and the rubber member 8, the spring constant of the rubber member 8 is increased as a result, which has the drawback that the engine vibration during the idling rotation is more likely to be transmitted to the vehicle body.

The purpose of the present invention is to provide a structure that eliminates the drawbacks of the conventional power unit displacement regulating device as described above, and to achieve this purpose, it is necessary to provide a displacement regulating device for either the power unit or the vehicle body. a first member to be fixed; a second member fitted to the first member and fixed to the other member; a rubber member fixed to either the first member or the second member; and the first member. or a pad member provided to be interposed in the sliding portion between the second member and the rubber member and made of a material having a coefficient of friction smaller than that of the rubber member. A displacement regulating device for the unit was obtained.

By having the above-described structure, the present invention reduces the frictional resistance at the sliding contact portion between the rubber member and the first member or the second member, and as a result, the spring constant of the rubber member is reduced to the conventional spring constant. This has the effect of making it difficult for vibrations and noises to be transmitted to the vehicle body, especially when the force P is small and the displacement δ is small, such as when the engine is idling. be.

Hereinafter, embodiments of the present invention will be described based on the drawings.
Power unit 1 and vehicle body 3 similar to the conventional one shown in the figure
When obtaining the mounting structure for the buffer rod 4, roll stopper 5, etc. disposed between them, the bracket 10 having the outer cylindrical portions 9 and 9a constituting the buffer rod is the same as the conventional one, but is fitted into the outer cylindrical portion 9. A rubber member 11 shown in FIG. 8 is used as a cushioning material.
apply. The inner cylinder 7 is fitted into the rubber member 11 and fixed to the power unit side (or vehicle body side), and the pad member 12 is fixed to the part on the upper or lower surface of the rubber member 11 that slides into contact with the outer cylinder part 9. do. The pad member 12 is made of a material having a coefficient of friction smaller than that of the rubber member 11,
It has a structure in which it is vulcanized and bonded integrally with the rubber member 11. For the pad member 12, a material with good sliding properties selected from among synthetic resins may be used, cut into appropriate sizes, or a method may be used in which the surface of the rubber member 11 is coated with a material such as nylon or Teflon. Also good.

9A and 9B show another embodiment of the present invention, in which a portion corresponding to the roll stopper 5 of FIG. 1 is applied. That is, a rubber member 14 is attached to the tip of a roll 13 fixed to the power unit 1 side, and the rubber member 14 is fitted into a rectangular tube 15 protruding from the vehicle body 3 side, thereby regulating the displacement of the power unit 1. A pad member 16 is integrally vulcanized and bonded to the surface portion of the rubber member 14. Therefore, even if there is vibration or rocking between the power unit 1 and the vehicle body 3 as shown by the arrow B, the rubber member 14 and the pad member 16 integrally molded on the surface thereof and made of a material having a smaller coefficient of friction than the rubber member 14 are used.
Vibration can be effectively absorbed by this action.

The operation when the present invention is applied to the buffer load 4 of the above embodiment will be described in detail. That is,
As shown in FIGS. 10A and 10B, between the rubber member 11 fitted into the outer cylindrical portion 9 constituting the buffer rod and the outer cylindrical portion 9, there is a gap between the rubber member 11 and the outer cylindrical portion 9 at the portions surrounded by dotted lines E' and E'. Also, pad members 12, 12 with a small coefficient of friction are interposed, and the rubber member 11
The inner cylinder 7 is inserted approximately at the center of the inner cylinder 7.
If we consider the case where a weak load P is applied relatively between the inner cylinder 7 and the outer cylinder part 9 when the engine is running at idle or when the engine is running at a constant speed, Figure 11 shows that As shown in A and B, the load P causes the rubber member 11 to be biased in the direction of the load P (rightward in the drawing), and the clearance 11C is deformed asymmetrically. At that time, the pad member 12,
12 is interposed between the outer cylindrical portion 9 and the rubber member 11, and due to the characteristics of the pad members 12, 12, that is, the effect of a small friction coefficient, the sliding characteristics between the two are extremely good, and as a result, the rubber member It is possible to bring about the same effect as keeping the spring constant of No. 11 small.

The broken line C in Fig. 7 shows the relationship between the load P and the displacement δ of the buffer rod manufactured by applying the present invention, and the spring constant when the load P is small is compared to the conventional structure shown by the solid line A. The engine speed is low, mainly when idling.
This shows that by minimizing the spring constant when a small load is applied over a wide range, it is possible to make it difficult for vibrations to be transmitted to the vehicle body.
Incidentally, it goes without saying that the above effect is exactly the same even in the roll stopper configuration shown in FIG. Furthermore, when the load P exerted on the buffer rod increases when the vehicle accelerates, the displacement of the rubber member based on the clearance reaches its limit, and it goes without saying that the rubber member has a large spring constant commensurate with the load P.

The displacement regulating device of the power unit according to the present invention can be applied to both the buffer rod and the roll stopper as described above, and the mounting position of the material having a smaller coefficient of friction than the rubber member is not only on the outer cylinder side as shown in the figure, but also on the inner cylinder side. It's okay to be by my side. In short, a first member or a second member consisting of an inner cylinder or an outer cylinder fixed to either the power unit 1 or the vehicle body 3, a rubber member fixed to the fitting portion of the two, and the first member Alternatively, a pad member made of a material having a smaller coefficient of friction than the rubber member is interposed at the sliding contact portion between the second member and the rubber member. As is clear from the above description, the present invention is effective when applied to a displacement regulating device that connects a power unit and a vehicle body via a rubber member, and can reduce vibrations of the vehicle body, especially when a small load is applied. Even after long-term use, it prevents rubber members from wearing out due to friction, prevents adhesion and aging of rubber members caused by frictional heat, and improves durability, making it suitable for power units in various automobiles. It is extremely effective when applied to displacement regulating devices.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram showing how the power unit is attached to the vehicle body, Figure 2 is a plan view illustrating the structure of a normal buffer rod, Figure 3 is a side view of the same part, and Figure 4 is the figure 3. FIG. 5 is a sectional view taken along the line - of FIG. 2, FIG. 6 is an exploded perspective view of the above-mentioned components, and FIG. A graph for comparing displacement δ with respect to force P,
FIG. 8 is a perspective view showing one embodiment of the present invention, FIG. 9 is a partial side view and B partial perspective view showing an example in which the present invention is applied to a roll stopper, and FIG. A sectional view and B side sectional view showing the state of the buffer-rod, and FIG.
FIG. DESCRIPTION OF SYMBOLS 1... Power unit, 3... Vehicle body, 4... Buff rod, 5... Roll stopper, 6... Displacement regulating device, 7, 7a... Inner cylinder, 8, 8a, 1
1, 14...Rubber member, 9, 9a...Outer cylinder part, 1
2, 16... Padded member.

Claims (1)

[Claims] 1. In a device that connects a power unit and a vehicle body via a rubber member to restrict displacement of the power unit, a first member fixed to either the power unit or the vehicle body; a second member that fits into one member and is fixed to the other; a rubber member fixedly formed on either the first member or the second member; and sliding between the first member or the second member and the rubber member. 1. A displacement regulating device for a power unit, comprising a pad member which is provided to be interposed in a contact portion and is made of a material having a coefficient of friction smaller than that of the rubber member.