JPH0235074Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the damping performance of a torsional vibration suppression device using lubricating oil.

Generally, a torsional vibration suppression device is fixedly attached to a shaft that causes torsional vibration, and is indirectly connected to a primary mass part that rotates while vibrating integrally with the shaft, and has a relatively large flywheel effect. The indirect coupling methods include a so-called elastic coupling having a restoring torque proportional to the amount of relative displacement, a so-called viscous coupling having a viscous torque proportional to the relative velocity, and One that has both is known.

Conventionally, a torsional vibration suppressing device with elastic coupling has a substrate with a plurality of intermediate pieces provided radially as a secondary mass part, and a plurality of grooves connected to lubricating oil injection holes at predetermined intervals on the outer circumferential surface. An inner star serving as a primary mass portion is provided at the center of the substrate so as to be rotatable and liquid-tight with respect to the substrate;
A plurality of spring blocks are fitted between the intermediate pieces by inserting their tips into the grooves of the inner star, and a plurality of spring blocks are attached liquid-tightly between the substrate and the inner star by covering the entire intermediate pieces and spring blocks. A device is known that is equipped with a ring and a side plate, and is configured so that the rotation of the inner star can be elastically transmitted to the substrate side having a flywheel effect via a spring block.

In the conventional torsional vibration suppressing device described above, a narrow lubricating oil passageway is formed in the side plate or the intermediate piece to interconnect the housing spaces of each spring block, thereby adding elastic coupling by the spring blocks, and lubricating oil is Some lubricant oils are configured to cause viscous bonding by flowing through the narrow lubricant flow path. In other words, the lubricating oil filled in the housing space of the spring block is pushed out into the flow passage by the spring block that is bent by the generation of torque vibration, and the viscous resistance generated when the oil flows into the adjacent housing space is used to suppress the vibration. By providing damping, the amount of damping can be adjusted over a wide range in combination with vibration damping by the spring block.

However, the configuration in which the viscous resistance of the lubricating oil is utilized for vibration damping has the drawback that the damping ability changes significantly due to changes in the viscosity of the oil due to changes in the lubricating oil temperature. Normally, the size and shape of the lubricating oil flow path are designed based on the viscosity of the lubricating oil during steady engine operation. , there is a risk of excessive damping and excessive torque acting on the shaft system.

In addition, in order to avoid the effect of excessive torque on the shaft system mentioned above, the size and shape of the flow passage should be set in consideration of the temperature difference between the lubricating oil temperature at engine startup and the lubricating oil temperature during normal engine operation. However, the peak of the resonance point becomes larger when the attenuation is large or small, and the position of the resonance point is also different when the damping is large or small, compared to the optimum damping state. Therefore, it is extremely difficult to design a torsional vibration suppression device that prevents all dangerous torsional vibrations even if the damping value changes greatly.

This idea was made in view of the above background,
By providing an adjustment member in the lubricating oil flow path to adjust the cross-sectional area of the flow path according to the temperature of the flow path, the flow path can be narrowed when the oil temperature is high and widened when the oil temperature is low. It is an object of the present invention to provide a torsional vibration suppressing device whose vibration damping ability does not change even if the oil temperature changes.

The invention will be described below based on embodiments showing drawings.

Figures 1 to 4 show an embodiment of this invention, and 16 in the figure is a substrate that seals the lubricating oil in the torsional vibration suppressor and has a flywheel effect as the mass of the outer ring. A large number of intermediate pieces 18 are fixed radially at equal intervals on the inner surface of the inner star 16 by bolts 19. A spring block 21, which is fitted into the spring block 21, is disposed such that its base is held between the adjacent intermediate piece 18. This spring block 21 is constructed by inserting a spring pin 22 into the proximal end of a leaf spring to bind it together.

23 is the intermediate piece 18 and the spring block 21
It is an annular side plate that is clamped to the substrate 16, and is fixed to the substrate 16 by the bolt 19 passing through the intermediate piece 18. The inner peripheral surface of this side plate 23 is in contact with the axis of the inner star 1.

On the other hand, a tightening ring 27 is fitted onto the outer peripheral surfaces of the intermediate piece 18 and the spring block 21 via a tapered ring 24. Further, one end of the inner star 1 is connected to a flange portion of the opposite output end of a crankshaft (not shown). Therefore, in this torsional vibration suppressing device, the vibration torque of the base plate 16, the intermediate piece 18, and the spring block 21, which act as the outer ring mass, is in opposite phase to the starting torque when the torsional vibration is resonant. This is a device that suppresses torsional vibrations that are transmitted to the shaft.

Circumferential grooves 16a and 23a are formed on the surface of the substrate 16 on the intermediate piece 18 side and on the surface of the side plate 23 on the intermediate piece 18 side, respectively.
An adjustment member 25 made of a resin material with a large coefficient of thermal expansion is filled at the bottom of the spring block 3a to form a lubricating oil flow path P that communicates the housing spaces S of each spring block 21 with the intermediate piece 18. ing. The storage space S of the spring block 21 is connected to the lubricating oil injection hole 1b, so that the storage space S and the flow path P can be filled with lubricating oil.
By the way, the adjustment member 25 expands and contracts depending on the temperature of the lubricating oil, and increases or decreases the cross-sectional area of the flow path P.

Next, the operation of this device configured as described above will be explained.

The torsional vibration suppressor according to the invention configured as described above connects the inner star 1 to the non-output side flange of the crankshaft and injects lubricating oil into the torsional vibration suppressor from the injection hole 1b, as described above. Use by injecting. In the above, the rotation of the inner star 1 is transmitted to the outer ring via the spring block 21. When a torque fluctuation or the like occurs during rotation transmission, the inner star 1 presses the spring block 21 in the circumferential direction of the inner star to bend it. Here, when the inner star 1 moves clockwise as shown in FIG. 3 to flex and move the spring block 21, the spring block 21 narrows the accommodation space S on the clockwise direction side of the spring block 21 and widens the opposite side. The lubricating oil pressure in the narrowed accommodation space S becomes high pressure and moves to the adjacent accommodation space S via the flow passage P on the clockwise side from the accommodation space S, and the lubricating oil pressure in the expanded accommodation space S becomes high. The pressure becomes low and lubricating oil flows from the accommodation space S on the high pressure side. At this time, the vibration is doubly damped by the viscous resistance of the lubricating oil flowing through the flow path P and the resistance when the spring block 21 is bent. Note that even when the spring block 21 is deflected and moved counterclockwise, the vibration is damped in the same manner as described above due to the movement of the lubricating oil.

Incidentally, the temperature of the lubricating oil is at room temperature when the engine is stopped, but increases when the engine starts and becomes constant when the engine is in steady operation. Here, when the lubricating oil temperature is low, the viscosity of the lubricating oil is high, and the adjustment member 25 at this time
The volume of is smaller than when the lubricating oil temperature is high.
Therefore, when the viscosity of the lubricating oil is high, the adjustment member 25
When the viscosity of the lubricating oil is low, the cross-sectional area of the flow path P is widened as shown by the solid line in Figure 4 to make it easier for the lubricating oil to pass through. Limit the amount of lubricant used. Therefore, even if the viscosity of the lubricating oil changes, the damping function of the lubricating oil does not change, and a stable vibration damping effect can be obtained. Note that the adjustment member 25 needs to satisfy conditions such as stabilizing the damping function by appropriately changing the cross-sectional area of the flow path P in accordance with the rate of change in the viscous resistance of the lubricating oil.
When selecting the material constituting the material, it is necessary to select a resin material that satisfies the above conditions and has a predetermined coefficient of thermal expansion (10 to 20 times that of steel) in accordance with the viscous resistance of the lubricating oil.

Figure 5 shows another embodiment of this invention.
A circumferential groove 23a' having a larger cross-sectional area than the circumferential groove 23a of the previous embodiment is formed, and a concave groove 25a is formed in this circumferential groove 23a'.
This object is achieved by fitting an adjusting member 25' having a groove 25a into the groove 25a and using the groove 25a as a flow path P'. When the volume of the adjustment member is increased with such a configuration, the adjustment member 2 is made of a material having a smaller coefficient of thermal expansion than the material of the adjustment member 25 in the previous embodiment.
5', the cross-sectional area of the flow path P' can be changed by a sufficient amount.

In the above embodiment, an example was described in which the circumferential grooves 16a and 23a were formed in the substrate 16 and the side plate 23, but it goes without saying that this invention can also be applied to a case in which the circumferential grooves are formed in an intermediate piece. . It is also possible to configure the adjusting member to include a spacer and a bimetal, and to change the cross-sectional area of the flow path by moving the spacer using the bimetal.

As explained above, this invention is a torsional vibration suppressing device configured to elastically transmit the rotation of either the substrate or the inner star to the other via a plurality of spring blocks. forming a flow path for lubricating oil,
An adjusting member having a predetermined coefficient of thermal expansion corresponding to the viscous resistance of the lubricating oil is provided in this flow passage, and the cross-sectional area of the flow passage can be changed by thermal expansion and thermal contraction of this adjustment member. Since the flow path automatically expands or contracts as appropriate depending on the height of the lubricating oil or the viscous resistance, it is no longer necessary to measure the lubricating oil temperature and adjust the size of the flow path accordingly. The size of the flow passage can be adjusted in accordance with the lubricating oil temperature without requiring additional time and with little time loss. As a result, even if the viscosity of the lubricating oil changes, the vibration damping effect of the lubricating oil does not change, providing an excellent effect of achieving stable vibration damping.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of this invention, with Figure 1 being a longitudinal sectional view, Figure 2 being a sectional view taken along line A-A in Figure 1, and Figure 3 showing a spring block. FIG. 4 is a sectional view of the main part, and FIG. 5 is a sectional view of the main part of another embodiment of this invention. 1... Inner star, 16... Board, 16a
... Circumferential groove, 18 ... Intermediate piece, 21 ... Spring block, 23 ... Side plate, 23a ... Circumferential groove, 25 ...
...Adjustment member, S...Accommodation space, P...Flow path.

Claims (1)

[Scope of utility model registration request] A substrate having a plurality of intermediate pieces arranged radially thereon, and a plurality of grooves connected to lubricating oil injection holes arranged at predetermined intervals on the outer circumferential surface, the center of the substrate being rotatable with respect to the substrate and liquid-tight. a plurality of spring blocks whose tips are inserted into the grooves of the inner stars and fitted between the intermediate pieces; A torsional vibration suppressor comprising a ring and a side plate that are fluid-tightly attached between the inner stars, and configured to elastically transmit rotation of either the substrate or the inner star to the other via a spring block. In the apparatus, a flow path communicating with the housing space of each spring block is formed in at least one of the base plate, the side plate, and the intermediate piece, and the flow path has a flow path that communicates with the housing space of each of the spring blocks, and a flow path that corresponds to the temperature of the lubricating oil in the flow path. Adjustment having a predetermined coefficient of thermal expansion according to the viscous resistance of the lubricating oil, which expands the cross-sectional area of part or all of the flow path when the lubricating oil temperature is low, and narrows it when the lubricating oil temperature is high. A torsional vibration suppressing device characterized by comprising a member.