JPH0413496Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the structure of an engine in which an oil pan is attached to a cylinder block via a plate between skirts.

(Prior Art) An oil pan is attached to the cylinder block of an engine, more specifically to the lower surface of the skirt of the cylinder block. Although this oil pan is formed of a thin plate material, it has a fairly large surface area, and therefore, when engine vibrations are transmitted, it generates a large amount of radiated sound, causing noise.

For this reason, conventionally, taking into consideration the fact that the skirt portion of the cylinder block is particularly susceptible to vibration due to so-called expansion and contraction movement, and that this vibration is transmitted to the oil pan,
Increasingly, an inter-skirt plate is provided to connect the skirt parts (the left and right ends thereof) to increase the rigidity of the skirt part (see Japanese Utility Model Application Publication No. 157514/1983). In this way, in a device having an inter-skirt plate, the oil pan is attached to (the skirt portion of) the cylinder block via the inter-skirt plate, but conventionally, the oil pan is attached to the cylinder block via the inter-skirt plate and the oil pan. It was attached to the pan using a common bolt, that is, by tightening together.

(Problem to be solved by the invention) However, when the plate between the skirts and the oil pan are fastened together with a common bolt to the cylinder block as in the above conventional method, the oil pan is connected to the cylinder block through this bolt. Engine vibrations are transmitted to the engine, which poses a problem in further improving noise reduction.

Therefore, an object of the present invention is to improve the rigidity of the cylinder block by using the plate between the skirts, that is, to attach an oil pan to the cylinder block through the plate between the skirts. An object of the present invention is to provide an engine structure that can effectively prevent vibrations from being transmitted to an oil pan.

(Means and effects for solving the problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, in an engine structure in which an inter-skirt plate and an oil pan are attached to a cylinder block, the inter-skirt plate is rigidly fixed to the cylinder block from below by a first bolt, and the above-mentioned The oil pan is connected to the second bolt via an elastic member having a notched recess that accommodates the head of the first bolt.
An elastic member is elastically fixed to the cylinder block from below by a bolt, and is provided between the second bolt and the oil pan to prevent direct contact between the second bolt and the oil pan. It is structured as if it were mediated.

By having such a configuration, first, the first
By rigidly connecting the skirt-to-skirt plate to the cylinder block using bolts, the rigidity of the cylinder block (particularly the skirt portion) can be improved by the skirt-to-skirt plate. On the other hand, the oil pan is elastically connected to the cylinder block (more specifically, the assembly of the cylinder block and the plate between the skirts) by the second bolt via the elastic member, that is, a type of float support, This effectively blocks the transmission of engine vibrations. The notch recess provided in the elastic member prevents interference between the elastic member and the first bolt.

(Example) An example of the present invention will be described below based on the attached drawings.

In FIG. 1, 1 is a cylinder block, 2 is a plate between skirts, and 3 is an oil pan. As is known, this interskirt plate 2 has a large surface area that covers the upper opening of the oil pan 3, and bulges 2a that bulge downward are formed at appropriate locations on the plate surface. The overall rigidity is made sufficiently large. As described later, such an inter-skirt plate 2 connects the left and right skirt portions 1a of the cylinder block 1.
They are connected to each other to regulate the rigidity of the skirt portion 1a, especially its expansion and contraction.

The attachment of the skirt plate 2 to the cylinder block 1 will be explained with reference to FIGS. 2 and 3.
is fixed from below by a first bolt 4 with its outer peripheral edge 2b seated on the lower surface of the mounting flange portion 1b formed at the lower end of the skirt portion 1a. That is, the threaded portion 4a of the first bolt 4
is passed through the skirt-to-skirt plate 2 and screwed into the screw hole 5 formed in the mounting flange portion 1b, so that the skirt-to-skirt plate 2
The mounting flange portion 1b and the head 4 of the first bolt 4
b, thereby rigidly connecting the inter-skirt plate 2 to the cylinder block 1. Of course, such fixing with the first bolts 4 is performed at multiple locations along the outer peripheral edge 2b of the inter-skirt plate 2 at predetermined intervals. In this way, since the inter-skirt plate 2 is rigidly connected to the cylinder block 1, the expansion and contraction of the skirt portion 1a is suppressed by the inter-skirt plate 2. In other words, the skirt portion 1a of the cylinder block 1 is Sufficient rigidity is ensured.

Next, the attachment of the oil pan 3 to the cylinder block 1 will be explained with reference to FIGS. 2 and 4. First, the inter-skirt plate 2 is fixed to the cylinder block 1 by the first bolt 4.
A mounting flange portion 3a of the oil pan 3 is seated on the lower surface (outer peripheral edge 2b) of the oil pan 3 via a first elastic member 6 located over its entire length. At this time, in order to prevent the head 4b of the first bolt 4 from interfering with the first elastic member 6, the first elastic member 6 has a portion where the head 4b of the first bolt 4 is located.
A notch recess 6a is formed to accommodate this head 4b.

Further, a second elastic member 7 is seated on the lower surface of the mounting flange portion 3a of the oil pan 3, and the oil pan 3 is attached to the cylinder block by a second bolt 8 via both elastic members 6 and 7. It is fixed at 1. That is, the threaded portion 8a of the second bolt 8
However, the second elastic member 7, the mounting flange portion 3a, and the first
Penetrating the elastic member 6 and the inter-skirt plate 2,
The oil pan 3 is screwed into a screw hole 9 formed in the mounting flange 1b of the cylinder block 1, and the oil pan 3 is mounted to the cylinder block 1 by the clamping action between the head 8b of the second bolt 8 and the mounting flange 1b. It will be done. Of course, in this installation state,
The oil pan 3 is elastically supported by the cylinder block 1 (the assembly of the cylinder block 1 and the inter-skirt plate 2) via both elastic members 6 and 7. The mounting flange portion 3a of the oil pan 3 has a relatively large fitting hole 3b into which the convex portion 7a of the second elastic member 7 fits. The bolt 8 is also prevented from coming into direct contact with the oil pan 3 in the radial direction.

Of course, a large number of the second bolts 8 are also provided at predetermined intervals around the entire circumference of the mounting flange portion 3a of the oil pan 3 so as not to interfere with the first bolts 4. 4 and the second bolt 8 are arranged alternately (see FIG. 2). In addition, 10 in the figure is a washer.

(Effects of the invention) As is clear from the above, the present invention improves the rigidity of the cylinder block by using the plate between the skirts, and elastically connects the oil pan to the cylinder block, thereby improving engine performance. It is possible to suppress vibrations from being transmitted to the oil pan.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along the - line in FIG. 1. FIG. 3 is a sectional view taken along the line -- in FIG. 2. Figure 4 is - of Figure 2.
Line sectional view. 1...Cylinder block, 1a...Skirt portion, 1b...Mounting flange portion, 2...Plate between skirts, 3...Oil pan, 3a...Mounting flange portion, 4...First bolt, 5...Screw Hole, 6...
...First elastic member, 6a... Notch recess, 7... Second
Elastic member, 8...second bolt, 9...screw hole.

Claims (1)

[Claims for Utility Model Registration] In an engine structure in which an inter-skirt plate and an oil pan are attached to a cylinder block, the inter-skirt plate is rigidly attached to the cylinder block from below by a first bolt. the oil pan is fixed to the second bolt via an elastic member having a notched recess for accommodating the head of the first bolt.
An elastic member is elastically fixed to the cylinder block from below by a bolt, and is provided between the second bolt and the oil pan to prevent direct contact between the second bolt and the oil pan. An engine structure characterized by being interposed.