JPH02201030A - Cylinder block reinforcing device for engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylinder block reinforcing device for an engine.

[Prior Art J] Generally, the skirt portion formed in the lower half of the cylinder block of an engine is formed in a substantially bell shape, so the rigidity of the lower end portion is low. For this reason, the unbalanced inertial force of the engine causes wavy deformation or vibration in the lower end of the cylinder block (skirt portion) that deforms it in the front-rear or left-right horizontal direction. is also transmitted to the power plant, which consists of an engine and a transmission. Although the engine and transmission case both have relatively high rigidity, the connection between the engine and transmission case is only connected with bolts, etc., so the connection rigidity is relatively low, and the power plant Bending vibrations are caused in the vertical or horizontal directions, with the connecting portion as an antinode, and such bending vibrations generate noise inside the vehicle.

There was a problem.

Therefore, in order to increase the rigidity of the lower end of the cylinder block and to increase the rigidity of the connection between the engine and transmission, a rail section around the lower end of the cylinder block and a rail of the oil pan are installed between the cylinder block and the oil pan. It has been proposed to arrange a cylinder block reinforcing member consisting of a frame member that engages with the rear end of the cylinder block reinforcing member and to fasten the rear end of the cylinder block reinforcing member to the transmission case. Showa 62-741
(See Publication No. 56).

[Problem to be Solved by the Invention 1] However, in the above conventional cylinder block reinforcing device in which the cylinder block reinforcing member disposed between the cylinder block and the oil pan is fastened to the transmission case, the underside of the cylinder block reinforcing member is An oil pan is installed over its entire surface. For this reason,
Since the cylinder block reinforcing member is bolted to the transmission case only on its left and right side surfaces, it is not possible to sufficiently increase the rigidity of the connection between the engine and the transmission case, and the 1L lowering caused by the power plant is not possible. There was a problem in that it was not possible to sufficiently reduce bending vibration in the direction or left and right directions.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to sufficiently increase the rigidity of the connection between the engine and the transmission case to effectively suppress bending vibrations caused by the power plant. An object of the present invention is to provide an engine cylinder block reinforcing device that can reduce in-vehicle noise.

[Means for Solving the Problems] In order to achieve the above object, the present invention is arranged between a cylinder block and an oil pan, is provided with a fastening portion to a transmission case, and is integrally provided with a crank bearing cap. In an engine equipped with a cylinder block reinforcing member, a service hole for fastening the rod is formed in the bottom wall of the cylinder block reinforcing member, and at least the crank bearing cap closest to the transmission case and the adjacent crank A cylinder block reinforcing device for an engine is provided, characterized in that a connecting member is provided that is fastened to a transmission case and a cylinder block reinforcing member while blocking a bottom wall between the bearing cap and the bearing cap from below.

[Operations and Effects of the Invention] According to the present invention, the cylinder block reinforcing member is not formed only of a frame that engages with the rail portion around the lower end of the cylinder block, but has a structure having a bottom wall. , the rigidity in the horizontal direction and in the front, rear, left, and right directions is extremely high. Therefore, the horizontal rigidity of the skirt portion of the cylinder protrusion can be increased, and wavy deformation or vibration occurring in the skirt portion can be effectively reduced.

Since the crank bearing cap is provided integrally with the cylinder block reinforcing member, when the crankshaft is attached to a predetermined position, the cylinder block reinforcing member is attached to the cylinder block at the same time.

After this, the connecting rod is attached to the crankshaft,
Since a service hole for fastening the connecting rod is formed in the bottom wall, the connecting rod can be easily attached or removed from the service hole even after the bottom wall/linda block reinforcing member is attached.

Further, the cylinder block reinforcing member is fastened to the transmission case on both left and right sides, and the connecting member fastened to the cylinder block reinforcing member is fastened to the transmission case by fastening bolts arranged in the left and right width direction of the transmission case. Ru. In other words, the assembly consisting of the cylinder block reinforcing member and the connecting member that are fastened to each other is fastened to the front end surface of the transmission case by fastening bolts arranged in a U-shape that opens upward on both sides and the bottom surface. .

Therefore, the rigidity of the connection between the engine (cylinder block) and the transmission case can be significantly increased, and the bending vibration caused by the power plant can be effectively suppressed, thereby reducing the noise inside the vehicle caused by the bending vibration.

In addition, between the crank bearing cap closest to the transmission case and the adjacent crank bearing cap, the bottom wall (service hole) of the cylinder block reinforcing member is only blocked by the connecting member.
The connecting rod can be easily maintained in this area by simply removing the connecting member. In addition, since the oil pan is not located below the connecting member, a slight space is formed in this area, making it easier to perform various tasks such as installing and removing bolts at the connecting part between the engine and the transminosive. Become.

[Example] Examples of the present invention will be specifically described below.

As shown in FIG. 1, there is a skirt portion 1a of the cylinder block l between the cylinder block l and the oil pan 2 of the 6-cylinder V-type engine VE consisting of the first to sixth cylinders #l to #6. A cylinder block reinforcing member 3 is provided to increase the rigidity of the cylinder block. This cylinder pro-tsuku reinforcing member 3 has first to
Fourth crank bearing caps 5-8 are integrally formed.

Then, the crankshaft 4 is
The torque transmitted to is further transmitted to an automatic transmission 12 via a torque converter 11.

The torque converter 11 and the automatic transmission 12 are connected to a transmission case 1 disposed on the rear side of the engine VE.
As will be explained later, this transmission case 13 is housed in the rear end of the cylinder block l and the rear end of the cylinder block reinforcing member 3 bolted to the lower side of the cylinder block l. are bolted to each other.

Further, between the third crank bearing cap 7 and the fourth bearing cap 8, the cylinder block reinforcing member 3 and the transmitter case 13 are connected to each other on the lower side of the cylinder block reinforcing member 3, as will be explained later. A connecting member 14 that is bolted to both is attached.

As shown in FIGS. 2 and 3, the cylinder block reinforcing member 3 includes a first rule part 16 that is substantially fastened to the cylinder block 1, and a second rail part 17 that is fastened to the oil pan 2. It has a substantially box-like shape with an upward opening, and includes a peripheral wall part 18 forming a peripheral wall between the first rule part 16 and the second rail part 17, and a bottom wall 19 forming a bottom surface. Note that a vertical wall member 15 for attaching auxiliary equipment such as a water pump (not shown) is provided in close contact with the front side end surfaces of the skirt portion 1a and the cylinder block reinforcing member 3. 1a and the front side end surfaces of the cylinder block reinforcing member 3 are closed. Service holes 21 are formed in the bottom wall 19 between the two adjacent crank bearing caps 5 to 8 (see FIG. 1) for attaching, removing, or maintaining the connecting rods 9, respectively. The first to fourth crank bearing caps 5 to 8 are fastened to corresponding upper bearing shafts (not shown) on the lower side of the cylinder block by crank bearing cap bolts 20.

Since the bottom wall 19 is formed on the cylinder block reinforcing member 3 in this manner, the horizontal rigidity of the cylinder block reinforcing member 3 is increased, and therefore the horizontal rigidity of the skirt portion 1a can be significantly increased.

The connecting member 14 has left and right side wall portions 22 and a bottom portion 23,
It is formed in a substantially U-shape that opens upward, and a rear wall portion 24 that comes into contact with the front end surface of the transmission case 13 is formed at its rear end. The connecting member 14 is connected to the third connecting member 14. The cylinder block reinforcing member 3 is arranged between the fourth crank bearing caps 7.8 (see FIG. 1) so that the side wall portion 22 and the bottom portion 23 surround the cylinder block reinforcing member 3 from below.

In addition, the rear wall portion 24 is designed to close a service hole (not shown) for tightening the torque converter formed on the front end surface of the transmission case 13, so a service hole shielding plate for tightening the torque converter is provided. There is no need to provide it, and the number of parts can be reduced.

This connecting member I4 is fastened to the bottom wall 19 of the cylinder block reinforcing member 3 by six bottom fastening bolts 25, and is fastened to the peripheral wall 18 by four side wall fastening bolts 26. In this way, the cylinder block reinforcing member 3 and the connecting member 14 are bolted together from both the bottom and side surfaces, so the assembly in which the cylinder block reinforcing member 3 and the connecting member 14 are connected will be described below. The rigidity of the connecting assembly (referred to as the connecting assembly) is very high. The connecting member 14 is further fastened to the front end surface of the transmission case 13 by three rear wall fastening bolts 27 arranged in the width direction of the transmission case 13 . Further, the cylinder block reinforcing member 3 is attached to the transmission case I by several fastening bolts (not shown) at the rear end portions of the left and right circumferential walls 18 in the width direction.
It is fastened to the front side end surface of 3. Therefore, the connection assembly is connected to the front end surface of the transmission case 13 by several bolts arranged in a U-shape, opening upward from both left and right sides and the bottom surface, so that the engine VE and the transmission The rigidity of the connection with the case 13 becomes extremely high.For this reason, the engine VE
and Transmi.

The rigidity of the power plant consisting of the John case 13 (including the torque converter 11 and automatic transmission 12) can be increased, and bending vibrations caused by the power plant can be effectively suppressed to reduce interior noise. be able to.

By the way, the connecting member 14 is the third. Between the fourth crank bearing caps 7.8 (see FIG. 1), the cylinder tab a 71 closes the bottom wall I9 of the reinforcing member 3, and therefore the service hole 21 formed in this portion from below. Therefore, simply by removing the connecting member 14, the
Maintenance of this part of the hook rod 9 can be performed from the screw hole 2I.

The oil pan 2 is located on the front side of the connecting member 14,
Since it is bolted to the second rail portion 17 of the cylinder block reinforcing member 3, the oil pan 2 is not disposed below the connecting member 14. Therefore, a space 29 is formed below the connecting member 14 on the immediate front side of the transmission/shield control case 13. Since there is sufficient space below the connecting member 14, a rib 31 extending in the crankshaft direction is provided at the center of the connecting member 14 in the width direction to further increase the rigidity of the connecting member 14. .

In addition, the drive plate of the normal torque converter 11 (
(not shown) is attached or removed from the front side with bolts or the like near the lower end of the front end surface of the transmission case I3, and in this way, a space 29 is formed near the lower end of the front end surface of the transmission case 13. This greatly improves the workability of installing and removing drive plates.

Note that the present invention has many advantages particularly over engines with automatic transmissions, so although this embodiment describes an engine with automatic transmissions, the present invention is applicable to engines with manual transmissions. Of course, it can also be effectively applied.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view of an engine with an automatic transmission equipped with a cylinder block reinforcing device according to the present invention. 2 is an enlarged side explanatory view of the vicinity of the cylinder block reinforcing member of the engine shown in FIG. 1. FIG. FIG. 3 is an enlarged bottom plan view of the engine shown in FIG. 1 with the oil pan removed. VE...Engine, #1 to #6...1st to 6th cylinders, l...cylinder block, 2...oil pan, 3
... Cylinder block reinforcing member, 4... Crankshaft, 5-8... First to fourth crank bearing cap, 11
...Torque converter, 12...Automatic transmission, 13
...Transmission case, 14...J connection member, I9...Bottom wall, 21...Service hole.

Claims (1)

[Claims] (1) In an engine equipped with a cylinder block reinforcing member disposed between the cylinder block and the oil pan, provided with a fastening portion to the transmission case, and integrally provided with a crank bearing cap, the cylinder block reinforcing member mentioned above. A service hole for connecting connecting rods is formed in the bottom wall of the transmission case, and at least the bottom wall between the crank bearing cap closest to the transmission case and the adjacent crank bearing cap is closed from below. A cylinder block reinforcing device for an engine, comprising a connecting member fastened to a reinforcing member.