JP2509100Y2 - Intake duct connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an intake duct connecting device for introducing air into an intake system of an engine.

[Prior Art] Conventionally, an intake duct of this type is attached to the rear surface of a tiltable cab, and an air cleaner is attached to a chassis. The expandable / contractible connecting tube is attached to the intake port of the air cleaner, and the connecting tube connects the duct and the air cleaner. Further, a skirt portion is formed at the lower end of the duct so as to be widened toward the end. When the cab is restored from the tilted state, the upper end of the connecting tube comes into the skirt while abutting the inner wall of the skirt of the duct, and the connecting tube communicates with the duct. However, if the center line of the connecting cylinder does not match the center line of the duct due to installation error of the duct or air cleaner, guiding the connecting cylinder only with the skirt will make the center line of the connecting cylinder completely in the center line of the duct. However, there is a risk that the air intake cross-sectional area may be narrowed at this connection.

Conventionally, in order to improve this point, a ring-shaped base and a centering consisting of a plurality of bones extending upward from the base and connected to each other at their apexes to form a substantially dome shape are provided from the open end of the connection hose. Deviation prevention device for the intake duct mounted so that the dome-shaped part protrudes
59968) or an air cleaner inlet fixed to the inner peripheral surface of the cylindrical portion of the connecting edge, with the pair of members with the base ends being parallel to each other arranged in a straight line by bending the wire rod into a chevron shape. A connection structure for the introduction pipe (Shokai 57-92059) has been proposed. With such a device or structure, when the cab is restored from the tilted state, centering or a pair of members guide the connecting tube so as to communicate with the intake port of the air cleaner, and the center line of the connecting tube matches the center line of the duct. Can be made.

[Problems to be Solved by the Invention] However, since the centering is integrally molded of synthetic resin, a molding die is required to manufacture the centering, and the cost of the die is expensive. There is a problem that pushes up the product unit price. Further, since the molding is performed by using a mold, there is a problem that the shape cannot be changed and the diversion is poor. On the other hand, using a pair of wire rods and bending the wire rods does not incur mold cost, but a special means for attaching the bent wire rods to the connection tube or the intake port of the air cleaner is required. However, there is a problem that the unit price is pushed up due to the increase in the number of installation steps.

The purpose of the present invention is to produce an intake air that can be manufactured with a small number of man-hours and is assembled, and even if there is a mounting error in the intake duct or the air cleaner, when the cab is restored from the tilted state, the intake cross-sectional area is not narrowed. It is to provide a duct connection structure.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments.

The air intake duct connecting device of the present invention has an expandable connecting tube 17 for connecting the air intake duct 11 attached to the back of the tiltable cab 12 and the air cleaner 13 attached to the chassis 16 to the air inlet 13a of the air cleaner 13. Alternatively, it is attached to the lower end of the duct 11, and a skirt portion (11a) is formed at the lower end of the duct 11 or the suction port 13a, and when the cab 12 is restored from the tilted state, the connecting cylinder 17 is brought into contact with the skirt portion 11a and the duct 11 Guide tool 1 for guiding to the lower end or suction port 13a
It is an improvement of the connection device of the intake duct equipped with 8.

What is its characteristic structure? The guide tool 18 includes the mounting portion 18a and the guide portion 1
8b and the connecting portion 18c are integrally formed by bending a single elastic wire, the guide portion 18b is erected in two rows parallel to each other on the attaching portion 18a and the connecting portion 18c, and the attaching portion 18a is the connecting tube. The guide portion 18b is formed into a substantially C-shape that can be attached to the mounting portion 17, and the mounting portion 18a of the guide portion 18b is a connection tube.
When it is attached to 17, it projects from the connecting tube 17 and duct 11
Alternatively, it is formed in a tapered shape so that it can be inserted into the suction port 13a.

[Operation] Since the guide 18 has the mounting portion 18a, the guide portion 18b, and the connecting portion 18c integrally formed by bending the elastic wire, it can be formed from one wire, and special equipment for processing can be provided. do not need.
The center line of the duct 11 and the suction port 13 of the air cleaner 13 due to manufacturing errors and assembly errors of the cab 12 and chassis frame 16.
Even if the center line of a is deviated, the guide tool 18 guides the center line of the connecting cylinder 17 so as to coincide with the center line of the duct 11 or the suction port 13a.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 6, the intake duct 11 is attached to the rear surface of the tiltable cab 12, and the air cleaner 13 is attached to the chassis frame 16 via a bracket 14. The expandable / contractible connecting tube 17 is the suction port 13a of the air cleaner 13.
The duct 11 and the air cleaner 13 are connected by the connecting cylinder 17. The connecting tube 17 is a bellows hose made of rubber in this example. Further, a skirt portion 11a is formed at the lower end of the duct 11 so as to widen toward the end.

A guide tool 18 is attached to the connecting cylinder 17, and when the cab 12 is restored from the tilted state, the guide tool 18 contacts the skirt portion 11a so that the center line Y of the connecting cylinder 17 coincides with the center line X of the duct 11. invite. As shown in detail in FIG. 2, the guide 18 includes a mounting portion 18a, a guide portion 18b, and a connecting portion 18c which are integrally formed by bending an elastic wire. The mounting portion 18a is the connection tube 17
It is formed in a substantially C-shape that can be inserted into the bellows concave groove 17a, and the guide tool 18 is deformed by its elasticity to allow the mounting portion 18a to enter the connection cylinder and be restored. Eye groove
It is attached to 17a. The guide portion 18b is provided in two rows, and the connecting portion 18b
connected by c. The guide portions 18b, 18b are erected parallel to each other on the mounting portions 18a, 18a and the connecting portion 18c, and project from the connecting group cylinder 17 with the mounting portion 18a inserted and can be inserted into the duct 11 in an inverted U shape. It is formed in a taper shape. Connection tube 17
In order to prevent the upper end of the connecting cylinder 17 from being deformed, a retainer 19 formed by bending an elastic wire into a ring shape is inserted into the uppermost groove 17a.

The operation of the intake duct connecting device thus configured will be described.

As shown in FIG. 4, the center line X of the intake duct 11 and the center line Y of the connecting cylinder 17 may be deviated from each other due to a mounting error of the duct 11 or the air cleaner 13. Cab in this case
When the cab 12 is lowered to restore 12 from the tilted state, as shown in FIG. 5, the guide portion 18b of the guide tool 18 abuts on the inner surface of the skirt portion 11a of the duct 11 and the connecting tube 1
Guide the center line Y of 7 toward the center line X of duct 11.
Furthermore, lower the cab 12 until the cab 12 is ready for running.
As shown in FIG. 6, the guide portion 18b is inserted into the duct 11 above the skirt portion 11a, and the center line Y of the connecting cylinder 17 substantially coincides with the center line X of the duct 11 as shown in FIG.
The upper end of the skirt contacts the inner top surface of the skirt portion 11a. At this time, the connecting cylinder 17 is curved into a substantially S-shape, and the suction port of the air cleaner 13 is
The duct 11 is connected to 13a. As a result, since the air intake cross-sectional area is hardly reduced, the air intake amount is not reduced.

FIG. 7 shows another embodiment of the present invention, which is an intake duct 31.
Connection tube 37 is attached to the lower end of the
A skirt portion 33b that spreads upward is formed at the upper end of 33a. The lower end of the connecting tube 37 is formed so as to widen so as to surround the skirt portion 33b, and a guide tool 38 is attached to the lower part of the connecting tube 37. Further, a strip-shaped mandrel 37a is embedded at the lower end of the connecting tube 37 so as not to be easily deformed. Guide 38 is cab 32
When is restored from the tilted state, the center line X of the connecting cylinder 37 is guided so as to match the center line Y of the suction port 33a while contacting the skirt portion 33b. In the guide tool 38, as in the above embodiment, the mounting portion 38a and the guide portion 38b are integrally formed by bending an elastic wire. The mounting portion 38a is inserted into the lowest groove 37b of the bellows of the connecting tube 37, and the guide portion 38b projects downward from the connecting tube 37 and is inserted into the suction port 33a with the mounting portion 38a inserted. It is tapered as possible.

The operation of the intake duct connecting device configured as described above is the same as that of the above-described embodiment, and thus the repeated description is omitted.

[Advantage of the Invention] As described above, according to the present invention, the guide and the guide are integrally formed by bending the elastic wire, and the guide is easy to insert and guide. The manufacturing man-hours and the mounting man-hours of are small. Even if the center line of the duct is different from the center line of the intake port of the air cleaner due to an error in the installation of the intake duct or air cleaner, the guide tool guides the center line of the connecting cylinder so that it coincides with the center line of the duct or intake port. In addition, since the connecting cylinder is flexibly deformed, the air intake cross-sectional area is not narrowed, and as a result, the air intake amount is not reduced.

Furthermore, since the mounting portion, the guide portion, and the connecting portion of the guide tool are integrally formed by bending the elastic wire rod, the dimensional deformation of each part is easy at the time of bending work, and the shape can be flexibly changed. It also has other effects that are rich in sex.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 3 of an air intake duct connecting device according to an embodiment of the present invention. FIG. 2 is a perspective view of the guide tool. FIG. 3 is a perspective view of a vehicle including the connecting device. 4 to 6 show the duct connection process when the cab shifts from the tilted state to the runnable state, as indicated by A- in FIG.
A line sectional view. FIG. 7 is a sectional view corresponding to FIG. 1 showing another embodiment. 11,31: Intake duct, 11a: Intake duct skirt, 12,3
2: Cab, 13: Air cleaner, 13a, 33a: Intake port of air cleaner, 16: Chassis frame (chassis), 17, 37: Connection tube, 18, 38: Guide, 18a, 38a: Mounting part, 18b, 38b: Information section,
33b: Skirt part of the air cleaner.

Claims (1)

(57) [Scope of utility model registration request] 1. An extendable connecting tube (1) for connecting an intake duct (11) attached to the back of a tiltable cab (12) and an air cleaner (13) attached to a chassis (16).
7) is attached to the suction port (13a) of the air cleaner (13) or the lower end of the duct (11), and the skirt portion (1) is widened toward the lower end of the duct (11) or the suction port (13a).
1a) is formed, and when the cab (12) is restored from the tilted state, the connection cylinder (17) is abutted against the skirt portion (11a) to the lower end of the duct (11) or the suction port (13a). In an air intake duct connecting device including a guide tool (18) for guiding, the guide tool (18) includes a mounting part (18a), a guide part (18b), and a connecting part (18c) made of a single elastic wire. The guide portions (18b) are bent and integrally formed, and the guide portions (18b) are parallel to each other in two rows.
a) and the connecting portion (18c) are erected, the attaching portion (18a) is formed in a substantially C-shape that can be inserted into the connecting tube (17), and the guide portion (18b) is the attaching portion. (18a) protruding from the connecting cylinder (17) in a state of being inserted into the connecting cylinder (17) and being tapered so that it can be inserted into the duct (11) or the suction port (13a). A device for connecting the intake duct.