JPS6218683Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device for an engine with a ladder frame.

A conventional engine with a ladder frame, more specifically, an engine equipped with a ladder frame that is connected to the lower end surface of the cylinder block at the journal part of the crankshaft, as disclosed in Japanese Utility Model Application Publication No. 52-2005. Now, in order to improve the accuracy of the journal part, it is considered that it is not desirable to simply interpose a sealing member between the two members as in the packing described in Japanese Utility Model Publication No. 46-29070.
As a result, the oil sealability was not good. In some cases, liquid packing has been used, but the sealing effect could hardly be expected.

This idea was devised in view of the drawbacks of the conventional sealing device for engines with ladder frames as mentioned above.
In addition to minimizing the contact area of the seal member on the joint surface of the crankshaft journal,
Ensuring sufficient direct contact between the cylinder block and ladder frame, improving the sealing effect without disrupting the accuracy of the crankshaft journal, and making it easy to position the seal member for easy insertion and insertion of the seal member. The objective is to provide a reliable sealing device for an engine with a ladder frame, which is reliable and prevents the sealing member from shifting due to engine vibration during use. In an engine equipped with a ladder frame that is joined to the lower end surface at the journal portion of the crankshaft, at least one of the cylinder block and the ladder frame is provided with a sealing groove having a large diameter portion for positioning at both ends, and a seal groove is provided at both ends of the ladder frame. A sealing device for an engine with a ladder frame is provided, in which a sealing member having a large-diameter portion for positioning is fitted in the sealing member.

One embodiment will be described below with reference to the drawings.

Reference numeral 1 designates a cylinder block for an engine with a ladder frame. A journal part 3 supporting the upper half of a crankshaft 2 is formed at the bottom of the cylinder block, and the lower end surface is configured to match the joint surface of the journal part 3. ing. Reference numeral 4 denotes a ladder frame, on the upper part of which is formed a journal part 5 that supports the lower half of the crankshaft 2, and on the upper end surface of the ladder frame 5.
The block 1 is connected to the lower end surface of the block 1, and is fastened with a bolt 6.

An oil pan 7 is attached to the lower end surface of the ladder frame 4 by means of a reinforcing member 8 and bolts 9 .

A groove 42 is formed on the outside of the position where the hole 41 of the bolt 6 of the ladder frame 4 is provided.
A sealing member 10 is fitted into the opening 2.

At both ends of the seal member 10 and the groove 42 in the front-rear direction, positioning large-diameter portions 11 and 43 having a slightly larger diameter than the intermediate portion are formed for positioning the seal member 10. Furthermore, the large diameter portion 1 of the sealing member 10
1 is formed to have a length extending outward from each end surface 40a of the ladder frame 4 in order to improve sealing performance at the end surface of the engine. Incidentally, l in FIG. 2 indicates the length of the above-mentioned extension portion.

In this case, as described above, the groove 42 is formed in the ladder frame 4, and the seal member 10 is fitted into the groove 42, so that the sealing effect can be improved without disturbing the accuracy of the crankshaft journal. It is something that can be achieved.

Further, since the large diameter portions 11 are formed at both ends of the seal member 10 to facilitate positioning, the insertion and insertion work of the seal member 10 becomes easy and reliable, and
Even during use, the sealing member 10 is prevented from moving due to engine vibrations, etc., and a reliable sealing device can be provided.

Furthermore, in the present invention, the large diameter portion 11 of the sealing member 10
is extended outward from each end surface 40a of the ladder frame 4, so when a flywheel or a gear case is connected to each end surface 40a, the extended portion of the large diameter portion 11 is compressed. Since the grooves are flat and have a large diameter along each end surface 40a to prevent oil from flowing out from the grooves 42, there is an advantage that oil sealing performance at each end surface 40a is also improved. Incidentally, in the above embodiment, an example was shown in which the groove was formed in the ladder frame, but it goes without saying that the same effect can be obtained even if the groove is formed in the lower end surface of the cylinder block.

As described above, the sealing device for an engine with a ladder frame according to the present invention is provided at both ends of at least one of the cylinder block and the ladder frame of an engine equipped with a ladder frame that is connected to the lower end surface of the cylinder block at the journal portion of the crankshaft. Since a seal groove having a large diameter portion for positioning is provided in the groove, and a seal member having a large diameter portion for positioning at both ends is fitted into the groove, the following effects can be obtained.

First, a groove is formed in at least one of the ladder frame and the cylinder block, and a seal member is inserted into the groove to minimize the contact area of the seal member on the joint surface of the crankshaft journal. , it is possible to ensure sufficient direct contact between the cylinder block and the ladder frame, and to improve the sealing effect without disturbing the accuracy of the crankshaft journal.

Further, by forming large diameter portions at both ends of the sealing member and inserting the large diameter portions into the large diameter portion of the groove, the sealing member can be easily positioned. In addition to making the work easier and more reliable, the sealing member is also prevented from shifting due to engine vibration during use, and has the effect of providing a reliable sealing device for an engine with a ladder frame.

Furthermore, since the large diameter portion of the sealing member is configured to extend outward from each end surface of the ladder frame, when a flywheel or gear case is connected to each of the end surfaces, the extended portion of the large diameter portion will not be pinched. Since the groove becomes flat and has a large diameter along each of the end faces under pressure to prevent oil from flowing out from the groove, there is an advantage that oil sealing performance at each of the end faces is also improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the main parts of the embodiment of the present invention, Fig. 2 is a partially cutaway plan view of the seal member and ladder frame of the same embodiment, and Fig. 3 is a slope view showing the seal member of the same embodiment. It is. 1; cylinder block, 2; crankshaft, 3,
5: Journal portion, 4: Ladder frame, 7: Oil pan, 10: Seal member, 40a: Each end face of ladder frame, 42: Groove, l: Length of extension portion.

Claims (1)

[Claims for Utility Model Registration] 1. Large diameter portions for positioning at both ends of at least one of the cylinder block and the ladder frame of an engine equipped with a ladder frame which is connected to the lower end surface of the cylinder block at the journal portion of the crankshaft. A sealing device for an engine with a ladder frame, which is provided with a groove in which a large diameter portion for positioning is formed at both ends of the groove, and a sealing member having a large diameter portion for positioning at both ends is fitted into the groove. 2. The sealing device for an engine with a ladder frame according to claim 1, wherein the sealing member has a length greater than the entire length of the cylinder block or the ladder frame.