JPH0634162U - Intake device for two-valve internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] The intake ports 4 and 5 for the two intake valves 2 and 3 provided in one cylinder 1 are provided on the side surface 7 of the cylinder head 6.
The intake pipe 8 from the air cleaner is provided on the side surface 7 of the cylinder head 6 while being opened to
In an intake device formed by joining a branch pipe 9 for branching to a branch, the manufacturing cost of the branch pipe 9 is reduced, and
Aim to reduce the weight. A branch partition 10 for branching one passage 9b in the branch pipe 9 communicating with the intake pipe 8 into two passages 9c, 9d communicating with the intake ports 4, 5. Is formed separately from the branch pipe 9, and the branch partitioning portion 10 is mounted in the branch pipe 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake system for a so-called two-valve internal combustion engine in which one cylinder is provided with two intake valves.

[0002]

[Prior art]

 Conventionally, this type of intake device is disclosed in, for example, Japanese Utility Model Laid-Open No. 4-19626 and, as shown in FIGS. 4 and 5, two intake valves 2 ', 3 provided in one cylinder 1'. The intake ports 4 ', 5'for each of the cylinder heads 6'are opened to the side surface 7 of the cylinder head 6', while the side surface 7'of the cylinder head 6'is provided with an intake pipe from an air cleaner (not shown) at one end. By joining a branch pipe 9'connecting the passage 8'and integrally forming a branch partition 9a 'in the branch pipe 9', one passage 9b communicating with the suction pipe passage 8'is formed. ′ Is branched into two passages 9 c ′ and 9 d ′ that communicate with both intake ports 4 ′ and 5 ′.

[0003]

[Problems to be solved by the device]

 That is, this conventional air intake device has a structure in which the branch partition 9a 'is integrally formed in the branch pipe 9'. Therefore, when manufacturing this branch pipe 9'by casting, a core mold formed by solidifying molding sand must be used to form the inside of the branch pipe 9 '. Therefore, the cost required for manufacturing the branch pipe 9'is significantly increased, and moreover, by casting the branch pipe 9'using a sand core mold, Since the wall thickness becomes thicker, the branch pipe 9'is increased in size and weight.

According to the present invention, the branch pipe in the intake device is die cast by a mold without using a core mold formed by solidifying molding sand, and in some cases, a heat resistant synthetic resin is used. It is a technical subject to provide it in a form that can be manufactured by injection molding.

[0005]

[Means for Solving the Problems]

 In order to achieve this technical problem, the present invention provides an intake pipe from an air cleaner on the side surface of the cylinder head while opening intake ports for both intake valves provided on one cylinder on the side surface of the cylinder head. In an intake device formed by joining a branch pipe for branching a passage to both of the intake ports, one passage communicating with the intake pipe passage in the branch pipe is divided into two passages communicating with the intake ports. The branching part for branching is formed separately from the branch pipe, and the branching part is mounted in the branch pipe.

[0006]

[Work]

 According to this structure, the branch pipe can be manufactured without providing the partitioning portion for branching inside the branch pipe. Therefore, the branch pipe can be manufactured by die casting using a die, and In some cases, this branch pipe can be manufactured by injection molding with a heat-resistant synthetic resin. On the other hand, the branching part installed in the branch pipe can also be manufactured by die casting using a die, and in some cases, the branch pipe can be injection-molded with a heat-resistant synthetic resin. Can be manufactured by.

[0007]

[Effect of device]

 Therefore, according to the present invention, it is possible to greatly reduce the cost required for manufacturing a branch pipe having a branching part inside, and moreover, when using a sand core type for the wall thickness. Since it can be made thinner, it has an effect that the branch pipe can be made smaller and lighter.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings of FIGS. In this figure, reference numeral 1 indicates a cylinder provided with two intake valves 2 and 3, and intake ports 4 and 5 for both intake valves 2 and 3 of this cylinder 1 are opened on a side surface 7 of a cylinder head 6. ing.

Reference numeral 9 indicates a branch pipe detachably joined to the side surface 7 of the cylinder head 6 by a bolt or the like (not shown), and one end of the branch pipe 9 is provided with an intake air from an air cleaner (not shown). The pipeline 8 is connected. A branching partition for branching one passage 9b communicating with the intake pipe 8 into two passages 9c, 9d communicating with the intake ports 4, 5 inside the branch pipe 9. In providing 10, the branching partition 10 is configured separately from the branch pipe 9 and mounted in the branch pipe 9.

The branching section 10 is configured such that flat surface sections 10a and 10b formed at both upper and lower ends thereof fit into grooves 9e and 9f provided on both upper and lower inner surfaces of the branch pipe 0, and The branch pipe 9 is fixed to the branch pipe 9 by an appropriate means such as caulking, bolting or press fitting. With this structure, the branch pipe 9 can be manufactured without the branching partition 10 provided therein, and thus the branch pipe 9 can be manufactured by die casting using a die, Further, in some cases, the branch pipe 9 can be manufactured by injection molding using a heat resistant synthetic resin. On the other hand, the branching partition 10 mounted in the branch pipe 9 can also be produced by die casting using a die, and in some cases, the branch pipe is made of a heat-resistant synthetic material. It can be manufactured by injection molding with resin.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view showing an embodiment of the present invention.

FIG. 4 is a partially cutaway plan view showing a conventional example.

5 is a sectional view taken along line VV of FIG.

[Explanation of symbols]

 1 Cylinder 2,3 Intake valve 4,5 Intake port 6 Cylinder head 7 Side of cylinder head 8 Intake pipe line 9 Branch pipe 9b, 9c, 9d Passage 10 Dividing partition

Claims (1)

[Scope of utility model registration request] 1. An intake port for two intake valves provided in one cylinder is opened on a side surface of a cylinder head,
In an intake device formed by joining a branch pipe that branches an intake pipe from an air cleaner into the intake ports to a side surface of the cylinder head, one passage communicating with the intake pipe in the branch pipe is A two-valve type characterized in that a branching partition for branching into two passages communicating with both intake ports is configured separately from the branching pipe, and the branching partition is mounted in the branching pipe. Intake device for internal combustion engine.