JPH0235073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a viscous damper that utilizes the viscosity of oil to absorb torque fluctuations in an engine or the like.

(Prior art) This type of viscous damper was
As described in Publication No. 32134 and Publication No. 57-19468, the space between the case fixed to the rotating shaft and the weight (inertial mass body) provided inside the case so as to be relatively rotatable is filled with oil, and the viscosity of the oil is It uses this to absorb torque fluctuations on the rotating shaft. In such a damper, in order to increase the durability of the oil and obtain the desired torque fluctuation absorption effect, it is necessary to prevent the oil from overheating.
As a cooling device for this purpose, the above Utility Model Publication No. 54-32134 was used.
The issue discloses an air-cooled structure that uses cooling air.

However, when installing a viscous damper in a housing with a closed structure such as a clutch housing, it is not possible to introduce cold air from the outside into the housing, so an air-cooled cooling device cannot be used. However, there is a problem in that the oil cannot be cooled sufficiently.

(Object of the invention) In order to solve the above-mentioned problem, the present invention attempts to provide a device that supplies cooling oil toward the outer surface of the viscous damper.

(Structure of the invention) The present invention connects the accessory drive gear mechanism and the input part of the clutch to the end of the crankshaft protruding from the cylinder block of the engine, and fixes the accessory drive gear mechanism to the cylinder block. an annular hollow case housed within the gear case, fixing the clutch housing of the clutch to the gear case, providing the clutch housing with an opening that communicates with the internal space of the gear case, and disposing within the clutch housing at a position adjacent to the opening; A viscous damper with a weight arranged relatively rotatably in the case and internal oil filled between the case and the weight is arranged, and a cooling damper formed in the gear case by an auxiliary drive gear mechanism is arranged. It is characterized in that oil droplets are supplied to the outer surface of the case.

(Example) In the drawing, which is a schematic vertical cross-sectional view, a crank gear 3 and a cylindrical joint boss 4 are fixed to the end of a crankshaft 2 protruding from a cylinder block 1.
An inward flange-shaped input portion 6 of a clutch 5 is fixed to the tip of the boss 4 with bolts 7. A crank gear 3 is fixed to the crankshaft 2 adjacent to the cylinder block 1. The gear 3 drives a cam gear 9, a governor drive gear 10, a lubricating oil pump drive gear 11, and other auxiliary drive gears provided around the gear 3. These gears 9-11
is provided inside a gear case 12 bolted to the cylinder block 1. The clutch 5 is housed inside a clutch housing 13. The clutch housing 13 has an outward flange 15 at its end on the cylinder block 1 side, and the flange 15 is fixed to the gear case 12 by bolts 16.

In the vicinity of the input section 6, the boss 4 has an outward flange 17 on its outer periphery, and a viscous damper 18 is connected to the flange 17. The viscous damper 18 is basically constructed by housing a weight 21 (inertial mass body) in a hollow case 20 extending in an annular shape so as to be relatively rotatable, and filling the gap between the case 20 and the weight 21 with an oil 22 such as silicone. has been done. The case 20 has an inward flange 23 on its inner periphery, and the flange 23 is fixed to the flange 17 with bolts 24.

The end of the clutch housing 13 on the flange 15 side is generally cylindrical and has a wide opening 25 formed inside. The opening 25 is an internal space 26 of the gear case 12.
It communicates with the gears 3, 9, and 11 and faces the space around them. viscous damper 18
is located within the clutch housing 13 at a location adjacent to the opening 25.

(Function) When the engine is in operation, the crankshaft 2 drives the gears 9 to 11 via the crank gear 3 and the like. Also, rotational force is transmitted from the end of the crankshaft 2 to the clutch 5 via the input section 6. In this state, the case 20 of the viscous damper 18 also rotates together with the crankshaft 2, but if fluctuations or vibrations occur in the engine torque, the weight 21 rotates relative to the case 20 against the viscous resistance of the oil 22. This viscous resistance absorbs torque fluctuations.

During the above operation, the internal oil 22 converts the excitation energy into thermal energy, and the oil 22 itself is heated. However, during operation, oil is supplied to gears 3, 9 to 11, etc. from an oil gear rally. This oil lubricates the gears 3, 9-11, and is scattered into the space 26 in the form of oil droplets by the gears 3, 9-11. Some or most of the oil droplets are sprayed onto the outer surface of the case 20 through the opening 25, cool the internal oil 22 of the case 20, and then flow down to the oil pan below. Since the internal oil is thus cooled by the external oil droplets, the temperature of the internal oil 22 does not become abnormally high. Therefore, the internal oil 22 always maintains a predetermined viscosity, and the viscous damper 18 always achieves a predetermined vibration energy absorption function. Furthermore, gear 3,
9-11 The oil after lubrication will be about 90 degrees, but the internal oil 22 should be maintained at about 120 degrees Celsius or less, so
Viscous damper 18 due to oil after gear lubrication
There is no problem in cooling the viscous damper 18, and the viscous damper 18 is sufficiently cooled.

(Effects of the invention) As explained above, according to the invention, the viscous damper 18 is arranged inside the clutch housing 13 fixed to the gear case 12, and the viscous damper 18 is arranged inside the clutch housing 13 fixed to the gear case 12, and Since droplets can be supplied to the viscous damper 18 from the internal space 26 of the gear case 12 through the opening 25 of the clutch housing 13, it is possible to prevent the internal oil 22 of the viscous damper 18 from becoming high temperature. Therefore, it is possible to increase the durability of the internal oil 22, prevent changes in viscosity, and maintain a sufficient vibration energy absorption effect at all times.

Furthermore, with the above structure, an auxiliary drive gear mechanism can be used as a mechanism for supplying oil to the viscous damper 18 without requiring a dedicated mechanism.
The structure can be simplified.

[Brief explanation of the drawing]

The drawing is a partial schematic vertical cross-sectional view of the embodiment. 1...Cylinder block, 2...Crankshaft,
3,9-11...gear, 5...clutch, 6...
Clutch input section, 12... Gear case, 13...
Clutch housing 13, 20...Case, 21
... Weight, 22 ... Oil, 25 ... Opening,
26...Inner space.

Claims (1)

[Scope of utility model registration request] An accessory drive gear mechanism and an input part of a clutch are connected to the end of the crankshaft protruding from the cylinder block of the engine, and the accessory drive gear mechanism is housed inside a gear case fixed to the cylinder block, and the clutch is connected to the clutch. A clutch housing is fixed to a gear case, an opening is provided in the clutch housing that communicates with the internal space of the gear case, and an annular hollow case is disposed within the clutch housing at a position adjacent to the opening and is relatively rotatable within the case. A viscous damper equipped with a weight and internal oil filled between the case and the weight is placed, and the cooling oil droplets formed inside the gear case are supplied to the outer surface of the case by the auxiliary drive gear mechanism. A viscous damper device characterized by: