JPH0683941U - Head cover structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a head cover structure that can be easily attached and detached even in a vehicle having a cab bridge, and achieve both noise reduction and maintainability. [Structure] The head cover 1 is divided into two near the lower surface of the cab bridge 5. One is a front cover 6 made of sheet metal, and the other is a rear cover 7 made of aluminum die cast. The insulators 10, 11, 12 and the like are interposed in the mating portion 8 of both covers, the contact portion between both covers and the cylinder head 4 and the neck 13 of the oil inlet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head cover structure that is mounted so as to cover the upper surface of a cylinder head of a diesel engine for the purpose of reducing noise.

[0002]

[Prior art]

 In recent years, there have been severe demands on noise reduction for diesel engines. As one of the countermeasures, it is effective to attach a large head cover that covers the entire top surface of the cylinder head including the rocker cover and the injection nozzle.

[0003]

[Problems to be solved by the device]

 By the way, one of the vehicles equipped with a diesel engine is a cab-over truck.In such a vehicle, a cab bridge is provided so as to straddle the installed diesel engine, and the cab bridge is installed in the cab bridge. There is a structure that supports the rear end side. In such a cab-over truck, the rear end of the cab is lifted when performing maintenance on the diesel engine, etc., but in order to perform work on the injection nozzle, it is necessary to remove the large head cover described above. .

However, since the cab bridge firmly fixed to the frame exists above the head cover, it is difficult to remove the head cover with the engine mounted due to interference with the cab bridge. Therefore, in a vehicle having a cab bridge, it is not possible to achieve both noise reduction by mounting the head cover and ensuring maintainability, and a solution to this problem has been desired.

Therefore, an object of the present invention is to provide a head cover structure that can be easily attached / detached even when a diesel engine is mounted on a vehicle without the cab bridge becoming an obstacle.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, and in a head cover structure that covers the entire top surface of a cylinder head including a rocker cover and an injection nozzle of a diesel engine mounted on a vehicle having a cab bridge, in the vicinity of the bottom surface of the cab bridge. The head cover structure is characterized in that the front cover and the rear cover are divided into two parts and can be attached and detached.

[0007]

[Action]

 According to the above-mentioned means, the head cover can be divided into two in the vicinity of the lower surface of the cab bridge, so that interference with the cab bridge is prevented and the head cover can be easily attached and detached.

If one of the front cover and the rear cover divided into two parts is made of a sheet metal part and the other is made of an aluminum die cast part, it is easy to obtain an assembly precision and a firm feeling of the mating part. In this case, the larger one of the two covers (usually the front cover) may be used as the sheet metal part.

[0009]

【Example】

 An embodiment of the head cover structure according to the present invention will be described with reference to FIGS.

The head cover 1 is a component that covers the entire upper surface of the cylinder head 4 of the diesel engine including the rocker cover 2 and the injection nozzle 3 to reduce engine noise. The head cover 1 is divided into front and rear parts near the lower surface of the cab bridge 5, a front cover 6 made of sheet metal is arranged on the front side, and a rear cover 7 made of aluminum die cast is mounted on the rear side.

The mating portion 8 of the front cover 6 and the rear cover 7 is assembled by inserting an insulator 10 into a groove 9 provided on the rear cover 7 side and pressing the insulator 10 with the tip of the front cover 6. It is configured to match. Further, the insulators 11 and 12 are provided at the contact portions between the lower ends of the front cover 6 and the rear cover 7 and the cylinder head 4, and the grommet 14 is also provided at the contact portion with the neck 13 of the oil injection port. Reference numeral 15 indicates a cap of the oil inlet.

Next, a fixing structure of the front cover 6 and the rear cover 7 will be described. Both the covers 6 and 7 are fixed to the rocker cover 2 and the cylinder head 4 by bolting, and have a structure that can be attached and detached as needed during maintenance. In this embodiment, three bolts 16a, 16b, 16c are used to fix the front cover 6, of which two bolts 16a, 16b are on the rocker cover 2 and the remaining bolts 16c are on the cylinder head 4. Each is fixed. Further, two bolts 17 are used to fix the rear cover 7, both of which are fixed to the rocker cover 2.

FIG. 3 shows an example of a structure for fixing the bolts 16a and 16b. A recess 6a is provided in the front cover 6, and an insulator 18 is sandwiched between the lower surface of the recess 6a and the rocker cover 2. It is configured so that the bolt 16a is tightly tightened. In addition, 19 has shown the washer.

FIG. 4 shows an example of a fixing structure of the bolt 16c. The stay 20 is interposed between the front cover 6 and the rocker cover 4, and the bolt 16c is fixed to the stay 20. There is. In addition, 18 is an insulator, 19 is a washer, and 21 is a bolt for fixing the stay 20 to the rocker cover 4.

FIG. 5 shows an example of a fixing structure of the bolt 17, in which a bolt flange 21 is provided integrally with the rear cover 7, and an insulator 18 is sandwiched between the lower surface of the bolt flange 21 and the rocker cover 2. It is configured so that the bolt 17 is tightly tightened.

The operation of the present invention will be described below. If the head cover 1 is divided into two as described above, when the head cover 1 is removed during maintenance of the injection nozzles 3 and the like, even if there is the cab bridge 5, the work can be easily performed without interfering with the cab bridge 5. The work procedure in this case is to first remove the bolts 16a, 16b, 16c, further remove the cap 15, and then slide the front cover 6 while lifting it. This allows the rear cover located below the cab bridge 5 to be removed. The end can be taken out smoothly. Next, by removing the bolt 17 exposed by removing the front cover 6, the front end of the rear cover 7 also located below the cab bridge 5 can be smoothly taken out, and the diesel engine mounted on the vehicle can be removed. On the other hand, the head cover 1 can be easily attached and detached.

Since one of the two divided head covers is made of sheet metal and the other is made of aluminum die-cast, not only the weight of the head cover is reduced, but also the assembling precision and firmness of the mating portion 8 are increased. Will be even easier.

[0018]

[Effect of device]

 According to the head cover structure of the present invention described above, even if it is a diesel engine mounted on a vehicle having a cab bridge, it is possible to provide a head cover that can be easily attached and detached in a vehicle state, which reduces engine noise and reduces maintainability. It becomes possible to achieve both securing and securing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a head cover structure according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram showing an example of a peripheral structure of a front cover fixing bolt (fixed to a rocker cover).

FIG. 4 is a diagram showing an example of a peripheral structure of a front cover fixing bolt (fixed to a cylinder head).

FIG. 5 is a diagram showing an example of a peripheral structure of a rear cover fixing bolt.

[Explanation of symbols]

 1 head cover 4 cylinder head 5 cab bridge 6 front cover 7 rear cover 8 mating part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Sohei Takahashi 10 Okura-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Mitsubishi Motors Engineering Co., Ltd. Tokyo office (72) Creator Koichi Kawamoto 10 Okura-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Mitsubishi Motors Engineering Co., Ltd. Tokyo office

Claims (1)

[Scope of utility model registration request] 1. A head cover structure for covering the entire upper surface of a cylinder head including a rocker cover and an injection nozzle of a diesel engine mounted on a vehicle having a cab bridge, wherein a front cover and a rear cover are provided near a lower surface of the cab bridge. A head cover structure characterized by being configured so that it can be detached in a divided manner.