JPH06299914A - Air heater for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an air heater for an internal combustion engine that has low assembly and wiring work, low manufacturing costs, and excellent reliability. [Structure] Partition walls 21 and 22 having openings 201 to 204, a concave groove 211, and notches are formed by integral molding.
Frame body 2 having a horizontally long outer frame shape that covers all intake ports
And (-) terminals 31, which are arranged on each end side of the frame body 2,
32 and (+) terminal 33 arranged in the center of the frame body 2
And one end 411, 421 is connected to the (-) terminals 31, 32, and the other end 412, 422 is connected to the (+) terminal 33, and the heater elements 41, 42 are connected to the frame body 2. And a supporting member 5 for insulating and supporting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air heater for an internal combustion engine used for heating intake air of a diesel engine.

[0002]

2. Description of the Related Art The following air heaters for internal combustion engines have been known. An air heater is provided for each cylinder so that the heated air is evenly distributed to a plurality of cylinders arranged in parallel, and they are connected by an intermediate harness (conventional example 1). The frame body 100 has a hollow frame shape including all intake ports of a plurality of cylinders arranged in parallel, and the frame body 100 has grounded terminals 111 and 112 and non-grounded terminals 113 to 1.
17, the power supply terminals 118 and 119 are arranged, the heater elements 121 to 124 are arranged as shown in FIG. 6, and the short plates 131 and 132 and the intermediate harness 1 are arranged.
33 in which each heater element is electrically connected (conventional example 2).

[0003]

However, the above-mentioned conventional techniques have the following drawbacks. [Disadvantage of Conventional Example 1] Since the same number of air heaters as the number of cylinders are required, the cost is high. In addition, it is necessary to perform wiring for connecting the air heaters in series or in parallel, which requires a large number of man-hours.

[Disadvantages of Conventional Example 2] Ungrounded Terminal 11
3 to 117, the short plates 131 and 132, the intermediate harness 133, and the like are used to connect the heater elements to each other, so that many assembly and wiring steps are required. In addition, the total number of contact points of the heater element increases, so that the total contact resistance increases. Since the frame body has a hollow frame shape and is horizontally long, distortion in manufacturing is large, and machining is required to obtain parallelism and flatness.

An object of the present invention is to provide an air heater for an internal combustion engine, which has a small number of assembly and wiring steps, a low manufacturing cost, and excellent reliability.

[0006]

[Means for Solving the Problems] In order to solve the above problems,
The present invention is an air heater for an internal combustion engine, wherein a frame body has a laterally long outer frame shape covering all intake ports, and uniformly supplies heated air to each of a plurality of cylinders arranged in parallel. Between the opening located on the center and the opening located on the center side, a conductive frame body integrally formed with a partition wall having a bridging portion, and a set of a set disposed on each end side of the frame body. A grounding terminal and a power feeding terminal arranged in an insulated state in the center of the frame, one end connected to the grounding terminal, the other end connected to the power feeding terminal, and an intermediate portion for the bridge. A configuration is adopted that includes a pair of heater elements that are insulated and supported by the parts, and a support member that electrically supports the heater elements in a meandering state in each opening.

[0007]

[Operation and effect of the invention] The total number of terminals is three, which is extremely small, and since the short plate and the intermediate harness are not required, the contact resistance can be greatly reduced and the durability is improved (the contact resistance is provided). Because the calorific value of the place decreases.) Since the number of heater elements is two and the number of terminals is three, the number of assembling / wiring steps can be reduced, so that the manufacturing cost is low and the reliability is also improved. The frame has a laterally long outer frame shape that covers all intake ports, but since the partition walls are integrally molded at two locations, the partition walls function as stays, improving the mechanical strength of the frame body. To do. Further, there is little manufacturing distortion, and good parallelism and flatness can be obtained without machining.

[0008]

EXAMPLE An example of the present invention will be described below with reference to FIGS. As shown in the figure, the air heater A for an internal combustion engine includes a frame body 2 having a horizontally long outer frame shape, which includes all intake ports (six cylinders), and (-) terminals 31, 32,
(+) Terminal 33 and heater elements 41, 42
And a supporting member 5 that insulatively supports the heater elements 41 and 42, and is mounted on the upstream side (downstream side of the air cleaner) of the intake manifold of the diesel engine to uniformly supply heated air to each cylinder.

Approximately 97 mm in length, 680 mm in width, 2 in height
A rectangular frame body 2 (made of aluminum die cast) having a size of 5 mm has openings 201 to 204, and openings 201 and 204 located on the end side and openings 202 and 2 located on the center side.
The partition walls 21 and 22 are formed integrally with 03. In the middle of the widened partition wall 21 (similarly to the partition wall 22), a recessed groove 211 is formed leaving the back wall 210.
Further, the notch 21 that connects the opening 201 and the opening 202.
2, 213 are formed, and these groove 211 and notch 21 are formed.
2, 213 form a bridge portion (see FIGS. 2 to 4).

The frame 2 is screwed to the left side of the drawing (see FIG. 1) and electrically connected to the frame 2 (-) terminal 31
Is composed of a bolt 311, a spring washer 312, a nut 313, a packing 314, and a bushing 315, and a lead wire 316 is used for the on-vehicle battery 6 (DC2).
4V) minus terminal 61 (see FIG. 2).

The frame 2 is screwed to the right side of the drawing (see FIG. 1) and electrically connected to the frame 2 (-) terminal 32
Consists of bolts, washers, nuts, packing, and bushings.

The (+) terminal 33, which is screwed to the frame 2 in an insulated state at the center of the frame 2 shown in FIG. 1 (see FIG. 1), is composed of an insulator, a bolt, a washer, a nut, a packing, a bushing, and a relay. It is electrically connected to the plus terminal 63 of the vehicle-mounted battery 6 via the contact point 62 by the lead wire 64.

The heater elements 41 and 42 are 22V-
It is a strip-shaped electric heating element having a capacity of 1000 W × 2, and the eye-shaped ends 411 and 421 are (-) terminal 3
1, 32 are fitted and grounded to the frame body 2, and the other ends 412, 422 of the eyeball shape are superposed (+) to the terminal 33.
Fit in. Further, the intermediate portions 410, 420 of the heater elements 41, 42 are sandwiched between the stepped insulators 214, 215, and the insulators 214, 215 and the intermediate portions 410, 4
20 is hooked on the concave grooves 211 and 221 by the leaf spring 216 (see FIG. 4).

The support member 5 includes a bracket 51 (SUS3
No. 04), an insulator (made of ceramic) 52 disposed in the bracket 51 for insulating and supporting the heater element 41, and a leaf spring 53 for elastically mounting the insulator 52 on the bracket 51.
1, 42 are insulated and supported in the openings 201 to 204 in a meandering state.

Next, the advantages of this embodiment will be described. [A] The total number of terminals is three (31, 32, 3)
3), which is extremely small, and the short plates 131 and 132 and the intermediate harness 133, which are required in the conventional air heater for an internal combustion engine, are not required, so that the contact resistance can be significantly reduced, and the air heater A for an internal combustion engine has a power loss. Can be reduced. Also, the short plates 131, 13
2, ungrounded terminals 113 to 117, intermediate harness 1
The conventional inconvenience that the 33 and the like generate heat to cause thermal deterioration and have a short life can be solved, and the air heater A for an internal combustion engine has excellent durability.

[A] The number of heater elements is two (4
The number of terminals is three (31,3).
2, 33), the man-hours for assembling / wiring are small, and the air heater A for an internal combustion engine can be manufactured at low cost and has high reliability.

[C] The frame body 2 has a laterally long outer frame shape including six intake ports, but since the partition walls 21 and 22 are integrally formed, the partition walls 21 and 22 function as stays. Therefore, the mechanical strength of the frame body 2 is improved.
In addition, the partition walls 21 and 22 cause less distortion in manufacturing, and good parallelism and flatness can be obtained without machining.

[Brief description of drawings]

FIG. 1 is a top view of an air heater for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the air heater shown in FIG.

3 is a cross-sectional view of the air heater of FIG. 2 taken along the line B-B ′.

FIG. 4 is an assembly diagram in the vicinity of a bridging portion of a partition wall of the air heater of FIG.

5 is an electric circuit diagram of the air heater of FIG. 1. FIG.

FIG. 6 is an explanatory diagram of a conventional air heater for an internal combustion engine.

[Explanation of symbols]

 A Air heater for internal combustion engine 2 Frame 5 Support member 21, 22 Partition wall 31, 32 (-) Terminal (grounding terminal) 41, 42 Heater element 33 (+) Terminal (power supply terminal) 201-204 Opening 410 Intermediate part 411 , 421 one end 412, 422 the other end

Claims (1)

[Claims] 1. An air heater for an internal combustion engine, wherein a frame body has a laterally long outer frame shape that covers all intake ports, and uniformly supplies heated air to each of a plurality of cylinders arranged in parallel. Between the opening located on the side and the opening located on the center side,
A conductive frame body integrally formed with a partition wall having a bridging portion, and a set of grounding terminals arranged on each end side of the frame body,
And a power feeding terminal disposed in an insulated state in the center of the frame, one end connected to the grounding terminal, the other end connected to the power feeding terminal, and an intermediate portion insulated and supported by the bridging portion. An air heater for an internal combustion engine, comprising: a set of heater elements; and a support member that insulates and supports the heater elements in a zigzag manner in each opening.