JPS61116018A - Sound suppressing device in civil engineering vehicle - Google Patents

Abstract

PURPOSE:To make it possible to adjust the deflecting direction of noise to an optional direction, by providing an inner ring member which holds a plurality of elongated and flat-like sound-suppressing deflector plates, rotatably in the peripheral direction thereof, in the inside of an outer ring member secured to in front of a radiator. CONSTITUTION:A sound suppressing device attached to the radiator guard section of a civil engineering vehicle, comprises an outer ring member 2, and an inner ring member 3 which is rotatable over an angular range of about 90 deg. along the inside of the outer ring member 3. A plurality of elongated and flat-like sound suppressing deflector plates 4 (4a-4h) are arranged in parallel with each other in the inside of the inner ring member 3. Each deflector plate 4 has such a width that each adjacent plates 4 may be made in contact with each other, and is formed in the longitudinally middle section thereof with a guide hole 9 through which two links 10, 11 are introduced therethrough. The deflector plates 4 are alternately journalled to the links 10, 11 which are coupled together by means of a connecting rod 12, thereby all deflecting plates 4 are rotated, simultaneously, in association with the operation of a lever 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field to which the invention pertains The present invention relates to a silencer for a civil vehicle, and more particularly to a silencer for a civil vehicle that controls noise emitted from a radiator air outlet.

(b) Prior art and its problems Reduction of ambient noise generated by earth-moving vehicles has become an important issue as part of the pollution problem, and a method for controlling the noise emitted from the radiator air outlet of earth-moving vehicles has been developed. Various devices have been devised.

In one example of a conventional device, a plurality of sound-absorbing baffle plates made of a sound-absorbing material arranged in a looper shape in parallel with each other are installed in a radiator guard portion that is an air outlet passage from the radiator. However, in the above device, each sound deadening deflector plate arranged in a looper shape can only be rotated in the same direction to adjust the inclination angle of the looper, and a tool is used to rotate each sound deadening deflecting plate individually. Therefore, although it was possible to adjust the direction of noise deflection, it was limited to directional control on one plane, and since the looper opening area did not substantially change, it was not possible to effectively reduce the total amount of noise emitted, and furthermore, the noise was reduced. Adjusting the rotation of the deflector plate was troublesome.

(c) Purpose of the invention The present invention has been made in view of the above-mentioned conventional circumstances, and includes:
The purpose is to:

(1) The direction in which the noise emitted from the radiator air outlet is deflected can be adjusted in any direction rather than in a flat direction.

(2) Adjust the opening area between each sound-deadening deflector,
Enables effective control of the total amount of noise emitted.

(3) It is possible to easily adjust the rotation of each sound deadening baffle plate.

B) Structure of the Invention The present invention includes an outer annular member fixed to the front of the radiator;
an inner annular member disposed concentrically on the inner periphery of the outer annular member; a plurality of elongated flat sound damping baffles held by the inner annular member and arranged in the inner periphery opening of the inner annular member; A silencer for a civil vehicle to be provided in an air outlet passage from a radiator consisting of a radiator, the inner annular member is rotatable on the inner circumferential surface of the outer annular member, and the inner annular member is rotatable on the inner circumferential surface of the outer annular member. Each of the sound-absorbing baffles has a rotary retaining axis along the longitudinal direction, and is rotatably held by the inner annular member such that the rotary retaining axes are approximately equally spaced and parallel to each other; A plurality of sound damping deflectors have approximately the same width so that they can come into contact with each other during rotation, and the length thereof is approximately equal to the distance between the inner circumferences of the inner annular member of the portion to which each sound damping deflector is attached. The board consists of a first set of a plurality of sound-dampening deflectors, each set having every other sound-dampening baffle board, and a second set of a plurality of sound-dampening deflectors; The plurality of sound dampening deflectors of each set are respectively engaged with the first and second links to adjust the opening area between the sound damping deflectors of the second set and the plurality of sound dampening deflectors of the second set are simultaneously disposed about the respective rotation holding axes. The sound damping baffle plate of the first set and the second set of sound muffling baffle plates are rotatable in opposite directions.

As a result, (1) the direction in which the noise emitted from the radiator air outlet is deflected can be adjusted in any direction, and (2)
) It is possible to effectively control the total amount of emitted noise, and (3
] It is possible to easily adjust the rotation of each sound deadening baffle plate.

(E) Embodiments of the Invention Preferred embodiments of the invention will now be described with reference to the drawings. FIG. 1 is a perspective view showing a sound-reducing device according to the present invention attached to a radiator guard portion of an earthmoving vehicle. An outer annular member 2 is fixed onto the radiator guard 1 by welding, bolting, or the like. An inner annular member 3 is held concentrically on the inner periphery of the outer annular member 2. Moreover, a plurality of elongated flat sound deadening baffle plates 4 are arranged inside the inner annular member 3, and these form the main components of the sound deadening device according to the present invention. Note that since this muffling device should be installed in the air outlet passage from the radiator, it can also be installed inside the radiator guard, without relying on the embodiment shown in FIG.

The details of each component will be explained below. As shown in FIGS. 2 and 3, the inner annular member 3 is rotatably fitted onto the inner circumference of the outer annular member 2, and its rotation range is limited to the protrusion 5 of the inner annular member, The range is limited to 90 degrees by the projection 5 and the engaging guide groove 6 of the outer annular member 2.

That is, the inner annular member that holds the noise-absorbing baffle plates 4 is moved between the state where the baffle plates 4 are aligned vertically as shown in FIG. 2 and the state where the baffle plates 4 are aligned horizontally as shown in FIG. 3. The angle can be adjusted. This angle adjustment is done manually by screwing the two fixing screws 7 from the outside of the outer annular member into the threaded holes 22 of the inner annular member through the guide groove 6 at a predetermined angular position.
can be fixed in position with respect to the outer annular member 2. The plurality of elongated flat sound deadening baffles 4 held by the inner annular member have at least their surfaces made of a sound absorbing material, and have a rotation holding shaft 8 along their longitudinal direction. It is held by the inner annular member 3 so that the holding axes are parallel and equally spaced. Each rotation holding shaft 8 has a hole 2 in the inner annular member.
0 (Fig. 2, Fig. 3) or fitting groove 21 (Fig. 4)
It is maintained by etc.

In addition, each sound deadening deflecting plate 4 is approximately equal to the distance between the inner circumferential surface of the inner circular member 3 and the inner circumferential surface of the inner circular member at which each sound deadening deflecting plate is attached so as to minimize the gap formed between it and the inner circumferential surface of the inner circular member 3. It has a length.

Further, each of the sound deadening deflecting plates 4 has a symmetrical shape with respect to each rotation holding shaft, and its width is approximately the same so that the adjacent sound deadening deflecting plates 4 contact each other at an angle at their 70-side ends when rotating. It has a width of ℃. Here, to explain in more detail the plurality of sound deadening baffles, FIGS. 5 to 18
As shown in the figure, the plurality of noise-reducing deflecting plates are composed of a first set of plural noise-reducing deflecting plates and a second set of plural noise-reducing deflecting plates, each of which includes every other noise-reducing deflecting plate. , each set of a plurality of sound deadening deflectors is associated with the first and second links, respectively, to adjust the opening area created between each of the first set of sound deadening deflectors and each of the second set of sound deadening deflectors. the plurality of noise-absorbing baffles in the first set and the plurality of muffling baffles in the second set are rotatable in opposite directions to each other. It is said that Some examples regarding the above are shown below. 5 to 8 are shown as a first embodiment. Here, FIGS. 5 and 6 are a top view and a front view, respectively, with the sound-absorbing deflector in the open state, and FIGS. 7 and 8 are a top view and a front view, respectively, with the sound-absorbing deflector in the closed state. be. Note that the front view is a view seen from the upstream side of the airflow. Referring to FIG. 8, each sound deadening baffle plate has a link guide hole 9 extending in the width direction in the longitudinal center thereof, and two links 10, 11 are inserted into these guide holes in the axial alignment of each sound deadening baffle plate. They extend parallel to each other along the directions. and link 10
are engaged with the sound deadening deflecting plates 4a, 4c, 424Lj, and the link 11 is engaged with the sound deadening deflecting plates 4b, 4d.

4f and 4h are engaged. The engagement points of the links 10, 11 with each of the sound-absorbing baffles are opposite to each other with respect to the axis of rotation of each of the muffling baffles.

Therefore, when the link 10 moves to the right in FIG.

4g, 4 (7) rotate counterclockwise by the same angle at the same time, and when the link 11 similarly moves to the right, each of the sound deadening deflecting plates 4b, 4d, 4f, 4h becomes the sound deadening deflecting plates 4a, 4.
Contrary to c, 4g, and 4g, they rotate clockwise at the same time by the same angle. Here, the links 10 and 11 are connected to each other by a connecting ring 12 as shown in FIG. 5, so that the sound-deadening baffle plates 4α, 4c are formed.

The rotations of 4g, 4 (7, 4b, 4d, 4f, and 4) occur simultaneously, and the rotation angles of each noise-absorbing deflector in each set are equal. Therefore, the angle adjustment of the noise-absorbing deflector can be easily and quickly performed. can.

With the above configuration, the plurality of sound damping baffles are arranged in parallel to each other as shown in FIGS. 5 and 6 to provide the maximum ventilation opening, and then arranged adjacent to each other as shown in FIGS. 7 and 8. The sound deadening baffles may change to a state where they contact each other at their side edges and generally close the vent opening. The rotation of the sound deadening deflecting plate can be performed manually by moving a lever 13 provided integrally with the sound deadening deflecting plate 4 (L) at the measurement part of the sound deadening deflecting plate 4a. 6
When arranged parallel to each other to provide maximum ventilation openings as shown in the figure, the silencing effect is small and the noise is emitted evenly in almost all directions. When the sound deadening baffle plate is rotated by a certain angle and the ventilation opening area is reduced, the noise passing through the narrowed opening is attenuated by interference and absorbed by the sound deadening baffle plate, thereby exerting a sound deadening effect. Note that when the sound-absorbing baffle plates are vertically aligned, the main diffusion direction of the noise emitted to the outside is the left-right direction due to the reflection effect of the rotated muffling baffle plates. As shown in FIGS. 7 and 8, the sound damping effect is maximized when adjacent sound damping baffle plates are in contact with each other at their side edges to substantially close the ventilation openings. The degree to which the ventilation openings are closed should be determined based on the balance between the intended silencing effect and the radiator cooling effect.

As shown in FIGS. 5 to 8, the inner annular member 3 may be provided with an annular outer flange 14 that protrudes toward the inner periphery in order to close the ventilation openings formed near both ends of each sound-absorbing baffle plate. As mentioned above, the inner annular member 3 holding the sound-deadening baffle plates 4a, -4 extends 90 degrees above the inner circumference of the outer annular member 2.
Since it is rotatable over a range of degrees, the direction of noise diffusion can be changed by changing the relative angle of the inner annular member 3 to the outer annular member 2. That is, when the inner annular member 3 is rotated to the state shown in FIG. 3, that is, the sound-absorbing baffle plate is aligned horizontally, and the muffling baffle plate is further rotated by a certain angle, the main direction of noise diffusion is the vertical direction. Become.

The second embodiment shown in FIGS. 9 and 10 is similar to the fifth embodiment described above.
This embodiment is basically the same as the first embodiment shown in FIGS. 8 to 8, and shows a top view and a front view with the ventilation openings closed, respectively. 4 hours
The only difference is that the longitudinal ends of ' are square instead of round, simplifying the shape.

The third embodiment shown in FIGS. 11 and 12 is basically the same as the first embodiment shown in FIGS. Although the top view and front view are shown, each sound deadening deflector plate 4α to 4h
The only difference is that the two links 15 and 16 that rotate the are not connected to each other by a connecting rod but are independent. That is, the two links 15, 16 are operated individually to form the sets of sound-absorbing baffles 4 ah 4 c * 4 g p 4y and 4b, 4d.

The rotation angles of 4f and 4n are adjusted. In this case link 15
．． 16 can also be constituted by a wire, and by appropriately extending the wire outside the device, the rotation angle of the sound deadening baffle plate can be adjusted from outside the device.

The fourth embodiment shown in FIGS. 13 and 14 is basically the same as the third embodiment shown in FIGS. 11 and 12, respectively, again with its ventilation openings closed. The top view and front view are shown, but the only point is that the longitudinal ends of each of the sound deadening baffle plates 4a/4' are not round but rectangular to simplify the shape. are different.

FIGS. 15 and 16 show the fifth embodiment, which shows the top and front views with the ventilation openings closed; however, they differ from the first embodiment shown in FIGS. 5 to 8. The differences are as follows. That is, instead of extending through a guide hole extending in the width direction in the center of each sound-absorbing deflecting plate, the link for rotating each sound-dampening deflecting plate 4α" to 4-4" extends outside the side edge of each sound-damping deflecting plate. It is extended along.

2 links 17.18 and sound deadening deflector board 4α each
, 4C", 4g", i g/l and 4b", 4d"
.

4f'' and 4h' are engaged by a ball joint 19 on the side end of each sound-deadening baffle plate.The two links are independent of each other as in the third and fourth embodiments.In this case, the links 17 and 18 can also be constructed of wires, and the rotation of each sound deadening baffle plate can be adjusted as in the case of the third embodiment.

The sixth embodiment shown in FIGS. 17 and 18 is basically the same as the fifth embodiment shown in FIGS. 15 and 16, again each with its ventilation openings closed. Although the top view and front view are shown, each sound deadening baffle plate 4α
The only difference is that the longitudinal ends of "'-4" are not round but rectangular to simplify the shape.

In the second to sixth embodiments described above, by adjusting the rotation angle and the opening gap of each sound-deadening baffle plate, the same sound-deadening effect as described in the first example can be achieved, and the inner annular member 3 The noise diffusion direction can be changed by rotating with respect to the outer annular member 2.

(F) Effects of the Invention As described above, the present invention comprises an outer annular member fixed in front of the radiator, an inner annular member disposed concentrically on the inner circumference of the outer annular member, and an inner annular member. A silencer for a civil vehicle to be installed in an air outlet passage from a radiator, comprising a plurality of elongated flat sound damping baffles held and arranged in an inner circumferential opening of an inner annular member. The member is rotatable on the inner circumferential surface of the outer annular member, and each of the plurality of elongated flat sound deadening deflecting plates has a rotation holding axis along the longitudinal direction, and each rotation holding axis is approximately equal. are rotatably held in the inner annular member so as to be spaced apart and parallel to each other, and each sound deadening deflector has approximately the same width such that adjacent sound deadening deflectors can come into contact with each other when rotated, and each sound deadening deflector has a length such that each The distance between the inner circumferential faces of the inner annular member of the portion to which the noise-absorbing baffle plates are attached is approximately equal to the distance between the inner periphery of the inner annular member, and the plurality of noise-absorbing baffle plates include a first set of every other noise-absorbing baffle plate.
consisting of a plurality of noise-absorbing deflecting plates of the first set and a plurality of noise-absorbing deflecting plates of the second set, and the opening area generated between each of the first set of noise-absorbing deflecting plates and each of the second set of noise-absorbing deflecting plates is The plurality of noise-absorbing baffles in each set are each engaged with a first and second link so as to be rotatable simultaneously in the same direction and through the same angle about each rotational retaining axis, and The sound deadening baffle plate and the plurality of sound deadening baffle plates of the second set are rotatable in mutually opposite directions.

As a result, (1) the inner annular member holding the plurality of sound-deadening deflecting plates can rotate on the inner circumferential surface of the outer annular member, so that the direction in which the noise emitted from the radiator air outlet is deflected can be set as desired. (2) the plurality of sound deadening deflectors of the first and second sets can be respectively engaged with the first and second links and rotated in opposite directions so that each adjacent sound deadening deflector Since the area of the ventilation openings formed between the plates can be varied, the total amount of noise emitted can be effectively adjusted; and the second
The rotational adjustment of each sound-deadening baffle plate is facilitated because the sound-absorbing baffle plates are engaged with the links and rotated simultaneously in the same direction and by the same angle.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an earthwork vehicle equipped with a silencer according to the present invention, and FIGS. 2 and 3 are ranges of changes in the mutual positional relationship between the outer annular member and the inner annular member in the silencer according to the present invention. FIG. 4 is a top view showing the state in which the rotation holding shaft of the noise-absorbing deflecting plate is held in the fitting groove of the inner annular member, and FIGS. 5 and 6 show the shapes of the plurality of noise-absorbing deflecting plates FIGS. 7 and 8 are top and front views of the first embodiment with the ventilation opening fully open, respectively, and FIGS. 7 and 8 are top views of the first embodiment with the ventilation opening closed, respectively. FIGS. 9 and 10 are a top view and a front view, respectively, with the ventilation openings closed in the second embodiment regarding the shape of a plurality of sound-absorbing baffles and the method of engagement with the links; 12 and 12 are top views and front views, respectively, with the ventilation openings closed in the third embodiment, and FIGS. The figures are a top view and a front view, respectively, with the ventilation openings closed in a fourth embodiment regarding the shape of a plurality of sound-absorbing baffles and the method of engagement with the links. FIGS. 17 and 18 show a top view and a front view, respectively, with the ventilation openings closed in the fifth embodiment regarding the shape of the sound-absorbing plates and the method of engagement with the links. FIGS. FIG. 7 is a top view and a front view, respectively, in a state where the ventilation opening is closed in the sixth embodiment regarding the fitting method. 2...Outer annular member 3...Inner annular member 4
...Sound-muffling baffle plate 8...Rotation holding shaft 10.
15.17...First link 11.16.18...Second link Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 1/Figure 72Figure 13Figure 74Figure 15Figure 17Figure 18

Claims (13)

[Claims] (1) An outer annular member fixed in front of the radiator, an inner annular member disposed concentrically on the inner periphery of the outer annular member, and an inner periphery of the inner annular member held by the inner annular member. A noise muffling device for an earthmoving vehicle to be provided in an air outlet passage from a radiator, which comprises a plurality of elongated flat sound deadening baffles arranged in an opening, wherein the inner annular member is connected to the circumferential inner surface of the outer annular member. Each of the plurality of elongated flat sound deadening deflecting plates has a rotation holding axis along the longitudinal direction, and the inner annular member is arranged such that the rotation holding axes are approximately equally spaced and parallel to each other. each sound-dampening baffle plate is rotatably held in the space, and each sound-dampening baffle plate has approximately the same width so that adjacent sound-dampening baffle plates can contact each other when rotated, and its length is equal to or smaller than the inner circle of the area to which each muffler baffle plate is attached. The plurality of sound-dampening deflecting plates are approximately equal to the distance between the inner circumferential faces of the ring member, and the plurality of sound-damping deflecting plates include a first set of plural sound-damping deflecting plates and a second set of plural sound-damping deflecting plates, each set including every other sound-damping deflecting plate. and a plurality of sound-dampening deflecting plates in each set each having a first and a second sound-damping deflecting board in order to adjust the opening area created between each sound-damping deflecting board of the first set and each sound-damping deflecting board of the second set. The plurality of noise-absorbing deflecting plates of the first set and the plurality of noise-absorbing deflecting plates of the second set are opposite to each other. A silencer for an earthmoving vehicle, characterized in that it is rotatable in a direction. (2) Each of the sound deadening deflecting plates has a link guide hole extending in the width direction in the central portion in the longitudinal direction, and is engaged with each of the sound deadening deflecting plates of the first set and each of the second set of sound deadening deflecting plates. 2. The silencer for an earthmoving vehicle according to claim 1, wherein the first and second links extend into the link guide hole. (3) said first and second sound-dampening baffles respectively engaged with each of said first set of sound-dampening baffles and each of said second set of sound-dampening baffles;
3. The silencer for an earthmoving vehicle according to claim 2, wherein the links are connected to each other by a connecting rod to form an integral linkage. (4) said first and second sound-dampening baffles respectively engaged with each of said first set of sound-dampening deflecting plates and each of said second set of sound-damping baffling plates;
3. The silencer for an earthmoving vehicle according to claim 2, wherein the links are independent from each other. (5) the first and second baffles are respectively engaged with each of the first set of sound deadening baffles and each of the second set of sound deadening baffles;
a link extending along the outside of a side edge of each sound deadening deflector plate, and each said sound deadening deflector plate and each said link being engaged by a ball joint at the side end of each sound deadening deflector plate. A silencer for an earthmoving vehicle according to claim 1. (6) The silencer for a civil vehicle according to claim 4 or 5, wherein the first and second links are made of wire. (7) Claims 1 to 6, characterized in that each of the longitudinal ends of the sound deadening baffle plates has a rounded shape.
A silencer for an earthmoving vehicle according to any of paragraphs. (8) Claims 1 to 6, characterized in that each of the longitudinal ends of the sound deadening baffle plates has a rectangular shape.
A silencer for an earthmoving vehicle according to any of paragraphs. (9) The noise muffling device for an earthmoving vehicle according to claim 1, wherein each of the muffling baffle plates has a rotating shaft engaged with a hole provided in the inner annular member. (10) The noise muffling device for an earthmoving vehicle according to claim 1, wherein each of the sound muffling deflecting plates has its rotation shaft engaged with a fitting groove provided in the inner annular member. . (11) Claims characterized in that the inner annular member has an annular outer peripheral flange that protrudes toward the inner periphery so as to cover a ventilation gap between the inner annular member and the longitudinal end of the sound deadening baffle plate. The silencer for earthmoving vehicles according to item 1. (12) The silencer for an earthmoving vehicle according to claim 1, wherein the angular position of the inner annular member relative to the outer annular member is fixed by two screws. (13) The silencer for an earthmoving vehicle according to claim 1, wherein a rotation range of the inner annular member with respect to the outer annular member is 90 degrees.