JP2510168Y2 - Inertial spindle type engine mount structure - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to an inertial spindle type engine mount structure applied to a vehicle having a front engine / front drive system with an engine placed horizontally, and is particularly effective in reducing idle vibration. Inertial spindle type engine mount structure.

2. Description of the Related Art Typical examples of engine mount structures for mounting an engine on a vehicle body include an inertia spindle type, a three-point support type, and a gravity center support type.

Therefore, in a front engine / front drive type vehicle (hereinafter referred to as FF vehicle), an inertial spindle type engine mount structure for installing a horizontally installed engine on a vehicle body will be described with reference to FIGS. 7 to 9. In the figure, 1 is the engine body, 2 is the transmission, 3 is the center of gravity, and 4
Indicates a torque roll shaft, and an engine unit (hereinafter referred to as an engine) in which the engine body 1 and the transmission 2 are integrally assembled is a front mount 5 ',
The rear mount 6, the left mount 7, and the right mount 8 are supported at four locations. The left mount 7 supports the upper side of the engine body 1 and the right mount 8 supports the upper side of the transmission 2. As shown in FIG. 7, the left mount 7 and the right mount 8 are
It is arranged on the torque roll shaft 4 passing through the center of gravity 3 in a plan view to effectively suppress engine vibration. Further, the front mount 5'disposed on the front side of the FF vehicle and the rear mount 6 disposed on the rear side (vehicle compartment side) each function as a roll stopper responsible for the rolling reaction force. It should be noted that rubber mounts are used as the mounts at these four locations, and although some vehicle models use fluid mounts for the rear mounts 6, none use fluid mounts for the front mounts. .

Problems that the Invention is to Solve By the way, the idle vibration transmitted to the vehicle body when the engine is idling is transmitted from the engine to the vehicle body through the engine mount and further vibrates the steering wheel and seat riser (seat attachment point). is there. In order to reduce this idle vibration, in the conventional inertial spindle type engine mount, the dynamic spring constant of the first stage of the front mount and the rear mount, which normally function as a roll stopper, has been reduced. That is, a rubber mount that serves as a roll stopper generally has a non-linear characteristic that is soft with a small displacement and rigid with a large displacement.
As shown in the figure, a soft first-stage dynamic spring constant from 0 to the point a and a rigid second-stage dynamic spring constant at the point a or higher are set. However, if the dynamic spring constant of the first stage is lowered, the acceleration shock becomes worse. Therefore, there is a limit to the conventional method of lowering the dynamic spring constant to reduce idle vibration. Further, if the dynamic spring constant of the second stage is lowered, the maximum roll angle of the engine increases, and it becomes difficult to secure a clearance in the engine room.

The present invention has been made based on such a background, and an object thereof is to provide an inertial spindle type engine mount structure capable of achieving both reduction of idle vibration and reduction of acceleration shock.

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and in an inertial spindle type engine mount structure for mounting an engine horizontally installed in a front engine / front drive type vehicle on a vehicle body, in an idling area, A fluid mount for phase-shifting the input in the counterclockwise direction is arranged only on the front roll mount, and the front roll mount component and the rear roll mount component are combined to cancel the belt roll. It is an inertial spindle type engine mount structure characterized by the above.

Operation According to the above-mentioned means, by using the fluid mount for the front roll mount, the front roll mount component is phase-deflected counterclockwise due to the characteristics of the fluid mount in the idling region. Using this phase deflection, if tuning is performed so that the angle between the roll mount component on the front side and the roll mount component on the rear side becomes an obtuse angle, the total vibration level of the idle vibration formed by combining both mount components will be Vector cancellation results in a small value.

Embodiment An embodiment of the inertial spindle type engine mount structure according to the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 is a plan view of an inertial spindle type engine mount structure for mounting an engine horizontally installed in an FF vehicle on a vehicle body. In the figure, 1 is an engine body, 2 is a transmission, 3 is the center of gravity, and 4 is a torque roll shaft. An engine in which the transmission 2 is assembled to the engine body 1 is a front mount 5 using a fluid mount. And a left mount 7, a left mount 7, and a right mount 8 using rubber mounts. The front mount 5 and the rear mount 6 are arranged in the front-rear direction of the vehicle body, and each function as a roll stopper that bears a rolling reaction force, and is also called a roll mount. The left mount 7 supports the upper side of the engine body 1, and the remaining right mount 8 supports the upper side of the transmission 2.

5 and 6 show a structural example of a fluid mount used for the front mount 5, 11 is an outer sleeve, 12 is an inner sleeve, 13 is a first stopper, and 14 is a second stopper.
A stopper, 15 is a side wall, 16 is an upper liquid chamber, and 17 is a lower liquid chamber. The upper liquid chamber 16 and the lower liquid chamber 17 are communicated with each other by an orifice 19 formed in a movable plate 18. The fluid mount is configured such that when an upward input indicated by an arrow 20 acts on the inner sleeve 12, the fluid in the upper liquid chamber 16 becomes an orifice.
It is configured to flow through the lower liquid chamber 17 through 19 and to absorb the input in the opposite direction when the liquid is applied in the opposite direction.

By the way, as shown in FIG. 4, the liquid mount having the above-described structure has a region where the phase deflection angle δ is significantly larger than that of a normal rubber mount, and this region coincides with the idling frequency of the engine. Tune so that That is, in a 4-cylinder engine, the idling speed of the engine is about 600 rpm, and therefore idle vibration of about 20 Hz is generated. Therefore, the front mount 5 of the present invention exhibits a large phase deflection angle in this idle vibration range. It should be a fluid mount with the characteristics to
It is not limited to the fluid mount structure shown in FIGS. 5 and 6 described above. In FIG. 4, the phase deflection angle δ is positive in the counterclockwise direction, and the normal rubber mount has a substantially constant phase deflection angle of about 10 degrees.

By the way, as a method to analyze the vibration problem in the car body,
Analysis by vector synthesis has been performed conventionally. In this analysis method, the component at each input point of the vehicle body is obtained as a vector amount in consideration of the phase relationship for each input point, and these components are integrated by vector addition to estimate vibration. Then, the total vibration level T of the idle vibration transmitted to the vehicle body side through the inertial spindle type engine mount
Is calculated by combining the roll mount component F on the front side (component of the front mount 5) and the roll mount component R on the rear side (component of the rear mount 6).

The operation of the inertial spindle type engine mount structure of the present invention using a fluid mount for the front mount 5 will be described with reference to FIGS. 2 to 3c. FIG. 3a is a diagram showing vector components of idle vibration in a conventional engine mount using rubber mounts for the front and rear roll mounts. The front roll mount component F ₀ and the rear roll mount component are shown. The total vibration level T ₀ is obtained by combining R ₀ and. Next, in the case of FIG. 3b, by using a fluid mount for the front mount 5, the roll mount component F on the front side is phase-shifted by an angle δ in the counterclockwise direction. Due to this phase deflection, the angle formed by the roll mount component R on the rear side and the roll mount component F on the front side becomes an obtuse angle, and the total vibration level T obtained by the vector synthesis of these two components is vector canceled and the front mount 5 It is much smaller than the total vibration level T ₀ when there is no phase deflection using a rubber mount. Further, FIG. 3c is a vector composite diagram when a fluid mount is used for the rear mount 6, and the roll mount components on the rear side are phase-shifted in the counterclockwise direction, so that the roll mount components R ′ and F ′ are formed. The angle formed by is an acute angle, and the vector-synthesized total vibration level T ′ is rather a large value.

Therefore, in the inertial spindle type engine mount, in order to reduce the idle vibration, it is effective to use the fluid mount only for the front mount 5, and the test result is shown in FIG. This test result is a measurement of the idle vibration transmitted to the seat riser (seat attachment point), and the vertical axis is the vibration level (g) of the seat riser vertical vibration,
The horizontal axis represents the engine speed (rpm), the solid line represents the case where a fluid mount is used for the front mount 5, the broken line represents the case where a rubber mount is used in the front mount 5, and the chain double-dashed line represents the case where the roll mount is removed. According to this test result, in the idling region where the engine speed is 550 to 850 rpm, the vibration level when using the fluid mount is lower than that when using the rubber mount (hatched portion in Fig. 2), and Experiments have also confirmed that idle vibration is reduced by utilizing the phase deflection characteristics. Moreover, in the engine speed range of 620 to 815 rpm, the vibration level is smaller when the fluid mount is used than when the roll mount is removed (the vibration is not transmitted through the roll mount). It looks as if the spring constant is below zero.

As described above, according to the inertial spindle type engine mount structure of the present invention, rather than reducing the dynamic spring constant of the roll mount to reduce idle vibration as in the prior art, the characteristics of the fluid mount used for the front mount 5 are not provided. Since the vector component of the vibration is phase-biased to cancel the vector, the acceleration shock does not worsen with the decrease of the idle vibration, and it is possible to achieve both the decrease of the idle vibration and the decrease of the acceleration shock. Become.

Effect of the Invention According to the above-described present invention, only the front roll mount is used as the fluid mount, and the fluid mount is tuned so as to perform phase deflection in the counterclockwise direction in the idling region. The side roll mount component is vector canceled by the composition. Therefore, the idle vibration can be reduced without reducing the dynamic spring constant of the roll mount, and it is possible to realize an inertial spindle type engine mount structure that can reduce the idle vibration and the acceleration shock at the same time.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an inertial spindle type engine mount structure according to the present invention, FIG. 2 is a view showing a result of a measurement experiment of a seat riser vertical vibration, and FIGS. 3a to 3c are roll mount components. FIG. 4 is a diagram for explaining vector composition, FIG. 4 is a diagram showing a phase deflection angle characteristic of a fluid mount, FIG. 5 is a longitudinal sectional view showing a structural example of the fluid mount, and FIG. 6 is a VI of FIG.
7 to 9 show a conventional inertial spindle type engine mount structure, where FIG. 7 is a plan view, FIG. 8 is a rear view, and FIG. 9 is a right side surface. FIG. 10 and FIG. 10 are views showing spring characteristics of a conventional roll mount (rubber mount). 1 ... Engine body, 2 ... Transmission, 5 ...
Front mount (fluid mount), 6 rear mount, 7 left mount, 8 right mount.

Claims (1)

(57) [Scope of utility model registration request] 1. In an inertial spindle type engine mount structure for mounting an engine horizontally mounted on a front engine / front drive type vehicle on a vehicle body, a fluid mount for phase-shifting an input in a counterclockwise direction in an idling region is provided on a front side. The inertial spindle type engine mount structure is characterized in that it is arranged only on the roll mount, and the front side roll mount component and the rear side roll mount component are combined to cancel the belt roll.