JPH0566248U - Engine soundproofing equipment - Google Patents

Abstract

(57) [Summary] [Structure] The housing 10 made of casting has an outer peripheral portion covering the outer peripheral surface of the flywheel 3 made of casting, and an end portion facing the engine body 1 and covering one end surface of the flywheel 3. , And the other end portion that covers the other end surface of the flywheel 3. An opening 14 is provided at the other end of the housing 10. An annular shield member 1 for shielding the propagation of air vibrations to the opening 14 in a space 15 between one end of the housing 10 and one end surface of the flywheel 3.
6 is integrated with the housing 10 and one of the flywheels 3 and faces the other through a gap. The opposite surfaces are machined. [Effect] It is possible to prevent noise without increasing the internal temperature of the housing and without increasing the machining cost of the housing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine soundproofing device in which a flywheel is covered by a housing.

[0002]

[Prior Art]

 A cast flywheel is attached to the crankshaft protruding from the engine body, the flywheel is covered by a cast housing, and the housing faces the outer peripheral portion that covers the outer peripheral surface of the flywheel and the engine body. In addition, an engine having one end portion that covers one end surface of the flywheel and the other end portion that covers the other end surface of the flywheel is generally used.

In such an engine, when a generator is connected to the flywheel or a working machine such as a pump is connected via a rubber coupling, the generator and the rubber coupling may be covered with a housing together with the flywheel. In this case, if the internal temperature of the housing rises, the rubber coupling will deteriorate due to heat and the performance of the generator will deteriorate. Therefore, an opening is provided at the other end of the housing to prevent the internal temperature of the housing from rising.

[0004]

[Problems to be solved by the device]

 However, the air in the space between the one end of the housing and the one end surface of the flywheel vibrates in resonance with the vibration of the crankshaft, the vibration of the engine body, and the like. When such air vibration propagates to the opening at the other end of the housing, it is emitted as noise.

Therefore, it is possible to shield the propagation of air vibrations to the opening by reducing the gap between the flywheel and the housing. However, when casting the housing, the propagation of air vibrations is shielded. It was difficult to manage the gap as small as necessary. Further, it is conceivable to machine the housing after casting in order to make the gap have an appropriate size, but the machining area is large and the cost is increased.

An object of the present invention is to provide a soundproofing device for an engine that can solve the above-mentioned problems of the prior art.

[0007]

[Means for Solving the Problems]

 The feature of the present invention is that a cast flywheel is attached to the crankshaft protruding from the engine body, the flywheel is covered by a cast housing, and the housing covers the outer peripheral surface of the flywheel. It has an outer periphery, one end facing the engine body and covering one end face of the flywheel, and the other end covering the other end face of the flywheel, and an opening is provided at the other end of the housing. In the engine, an annular shielding member that shields the propagation of air vibrations to the opening in the space between one end of the housing and one end surface of the flywheel is integrated into one of the housing and the flywheel. The other surface is opposite to the other through a gap, and the opposite surfaces are machined. The shielding member is preferably cast with one of the housing and the flywheel and projects toward the other.

[0008]

[Action]

 According to the configuration of the present invention, the shielding member is integrated with one of the housing and the flywheel and faces the other through a gap. Therefore, by reducing the gap, one end of the housing and one of the flywheel are The propagation of air vibrations in the space between the end faces can be blocked. The size of the gap can be set by machining the surfaces of the housing, the other of the flywheel, and the shielding member that face each other, so that the machined area can be made as small as possible. Since the shielding member is cast together with one of the housing and the flywheel and protrudes toward the other, it is not necessary to separately provide a shielding member and the number of parts does not increase.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a connecting structure between a hydraulic working machine pump 6 and an engine. A cast flywheel 3 is attached to a crankshaft 2 protruding from an engine body 1 constituted by a cylinder block with bolts 5a. There is. A rubber coupling 4 is attached to the flywheel 3 by a bolt 5b, and a block 8 spline-fitted to an input shaft 7 of a pump 6 is attached to the rubber coupling 4 by a bolt 9.

The flywheel 3 is covered with a cast housing 10. The housing 10 includes an outer peripheral portion 11 that covers the outer peripheral surface 3a of the flywheel 3, an end portion 12 that faces the engine body 1 and covers one end surface 3b of the flywheel 3, and the other end surface 3c of the flywheel 3. And the other end portion 13 for covering. The outer peripheral portion 11 and one end portion 12 are integrally cast, and the other end portion 13 is separately cast and attached to the outer peripheral portion 11. The opening 14 provided at the other end 13 prevents the internal temperature of the housing 10 from rising.

An annular shield member 16 is cast together with the other end portion 13 of the housing 10, and the shield member 16 projects toward the flywheel 3. The gap δ between the shield member 16 and the flywheel 3 in the axial direction has a constant size by machining the surfaces 16a and 3c of the shield member 16 and the flywheel 3 which face each other. That is, the gap δ is made small enough to block the air vibration in the space 15 between the one end 12 of the housing 10 and the one end surface 3a of the flywheel 3 from propagating to the opening 14. ing. As a result, the air vibration is not emitted from the opening 14 and noise can be prevented. Further, by machining the surfaces 16a and 3c of the shielding member 16 and the flywheel 3 which face each other, the gap δ can be made to have a desired size, so that the machining area can be made as small as possible.

FIG. 2A shows a second embodiment of the present invention. The difference from the first embodiment is that the shielding member 16 is formed by a member different from the other end 13 of the housing 10, The point is that the end 13 is integrated by welding. Others are the same as those in the first embodiment, and the same parts are designated by the same reference numerals.

FIG. 2B shows a third embodiment of the present invention. The difference from the first embodiment is that the shielding member 16 is cast together with the outer peripheral portion 11 of the housing 10 and the outer peripheral surface of the flywheel 3 is formed. The radial gap δ with respect to 3a is made small enough to shield the propagation of the air vibrations. Others are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals.

FIG. 2C shows a fourth embodiment of the present invention. The difference from the first embodiment is that the shielding member 16 is cast together with the one end 12 of the housing 10 and one end surface of the flywheel 3 is cast. The axial gap δ with 3b is made small enough to block the propagation of the air vibrations. Others are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals.

FIG. 2 (4) shows a fifth embodiment of the present invention. The difference from the first embodiment is that the shielding member 16 is cast together with the flywheel 3 and the shaft with the one end 12 of the housing 10 is made. The gap δ between the directions is set to a size sufficient to block the propagation of the air vibrations. Others are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals.

FIG. 3 shows a sixth embodiment of the present invention. The difference with the fifth embodiment is that the rotor shaft 21 of the generator 20 is connected to the flywheel 3 and the other end 13 of the housing 10 generates electricity. The point is that the casing of the machine 20 is also used and the other end 13 is provided with an inlet 22 and an outlet 23 for the cooling air. The other parts are the same as in the fifth embodiment, and the same parts are designated by the same reference numerals.

FIG. 4A shows a seventh embodiment of the present invention. The difference from the sixth embodiment is that the shielding member 16 is cast together with the other end 13 of the housing 10 and the flywheel 3 is The point is that the gap δ between the end surface 3c and the axial direction is made small enough to shield the propagation of the air vibrations. The other parts are the same as those in the sixth embodiment, and the same parts are designated by the same reference numerals.

FIG. 4 (2) shows an eighth embodiment of the present invention. The difference from the seventh embodiment is that the shielding portion 16 is formed by a member different from the other end portion 13 of the housing 10. The point is that it is integrated with the end portion 13 by welding. The other parts are the same as in the seventh embodiment, and the same parts are designated by the same reference numerals.

The present invention is not limited to the above embodiments. For example, the present invention can be applied to an engine that drives other than a pump or a generator.

[0021]

[Effect of the device]

 According to the engine soundproofing device of the present invention, the annular shield member is integrated with one of the housing and the flywheel, so that air vibration in the space between one end of the housing and one end face of the flywheel is generated. Noise can be prevented without increasing the internal temperature of the housing and without increasing the machining cost of the housing. Since the annular shielding member is cast with one of the housing and the flywheel and projects toward the other, the number of parts does not increase and an increase in cost can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a first embodiment of the present invention.

FIG. 2 is a sectional view of the essential parts of the second to fifth embodiments of the present invention.

FIG. 3 is a sectional view of an essential part of a sixth embodiment of the present invention.

FIG. 4 is a sectional view of an essential part of a seventh embodiment and an eighth embodiment of the present invention.

[Explanation of symbols]

 1 Engine Main Body 2 Crankshaft 3 Flywheel 10 Housing 11 Outer Part 12 One End 13 Other End 14 Opening 15 Space 16 Shielding Member

Claims (2)

[Scope of utility model registration request] 1. A cast flywheel is attached to a crankshaft projecting from an engine body, the flywheel is covered by a cast housing, and the housing includes an outer peripheral portion covering an outer peripheral surface of the flywheel, and an engine. An engine having one end facing the main body and covering one end face of the flywheel, and the other end covering the other end face of the flywheel, and the opening provided at the other end of the housing, An annular shielding member that shields propagation of air vibrations to the opening in a space between one end of the housing and one end surface of the flywheel,
A soundproofing device for an engine, characterized in that it is integrated with one of the housing and a flywheel, faces the other through a gap, and has opposite surfaces machined. 2. The engine soundproofing device according to claim 1, wherein the shielding member is cast with one of the housing and the flywheel and projects toward the other.