JP2000271853A - Honing method and honing device for cylinder block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve roundness of a cylinder bore during assembly of a cylinder block. SOLUTION: This honing device performing honing on a cylinder bore SB of a cylinder block S is equipped with a cylindrical honing head 3 having honing sticks 2 arranged on an outer peripheral surface and is provided with a load applying mechanism 10 on an upper end part of an outer wall Sw of the cylinder bore SB, applying load toward a center P of the cylinder bore SB from both an arranged direction and the direction perpendicular to the arranged direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for honing a cylinder block used for honing a cylinder bore of a cylinder block.

[0002]

2. Description of the Related Art Conventionally, as the honing apparatus described above, for example, there is a honing apparatus provided with a rotating shaft and a honing head having a cylindrical shape and a plurality of grindstones arranged annularly on an outer peripheral surface.

If the cylinder bore is honed by this honing device, the accuracy of the circularity of the cylinder bore can be improved. However, when the thickness of the cylinder portion is reduced to reduce the weight of the cylinder block, Even if the roundness of the cylinder bore is increased by the device, it is inevitable that the roundness of the cylinder bore is reduced due to the application of the head bolt tightening load when assembling the cylinder block.

Recently, as shown in FIG. 6, a cylinder part 52 having a bottomed cup shape is assembled into a cylinder hole 52 of a cylinder block 51 to form a double cylinder structure. The roundness of the cylinder bore 54 during assembly is prevented from lowering. (JP-A-5-172000)

[0005]

However, in the above-mentioned cylinder block 51 having a double cylinder structure, the roundness of the cylinder bore 54 can be prevented from being lowered at the time of assembling, but the cost is increased due to the increase in the number of parts. In addition, there is a problem that the output cannot be improved due to a decrease in knock resistance due to the deterioration of the bore cooling property, and solving these problems has been a conventional problem. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and performs honing in consideration of deformation of a cylinder bore that may occur when assembling a cylinder block. It is an object of the present invention to provide a honing method and a honing apparatus for a cylinder block, which can improve the roundness and, as a result, reduce the product cost and improve the output of an engine.

[0007]

According to a honing method for a cylinder block having a plurality of cylinder bores, the centering of the cylinder bore is performed at the upper end of the outer wall of the cylinder bore. It is characterized in that it is configured to perform honing processing while applying loads from the cylinder bore arrangement direction and the direction orthogonal to the arrangement direction toward the cylinder bore. It is a means to solve the problem.

On the other hand, a honing apparatus according to a second aspect of the present invention is a honing apparatus for honing a cylinder bore of a cylinder block having a plurality of cylinder bores, the honing apparatus having a cylindrical shape and a grindstone disposed on an outer peripheral surface. The head and the upper end of the outer wall of the cylinder bore are provided with a load applying mechanism for applying a load from the direction in which the cylinder bores are arranged toward the center of the cylinder bore and in a direction orthogonal to the arrangement direction. Such a configuration of the honing device is used as means for solving the above-mentioned conventional problems.

In the honing device according to the third aspect of the present invention, the load applying mechanism is provided at an upper end of the cylinder bore with approximately nine holes.
A load-loading cylinder set at an interval of 0 °, a pressing body that moves in the radial direction of the cylinder bore by the hydraulic pressure supplied to the load-loading cylinder and presses the upper end of the outer wall of the cylinder bore toward the center, The honing device according to claim 4 of the present invention is configured to include a hydraulic control unit that controls a hydraulic pressure supplied to the load cylinder, and the load-load cylinder of the load-load mechanism is mounted on an upper end of the cylinder bore. A coolant supply passage communicating with a coolant supply source and a coolant supply passage communicating with the coolant supply passage can be sprayed into the cylinder bore between the load lifting cylinders of the annular lift and being held integrally by the possible annular lift. The coolant nozzle is provided. In the honing method and the honing device for a cylinder block according to the present invention, the load load position at the upper end of the outer wall of the cylinder bore is 40 m from the upper end of the outer wall.
It is desirable that the position be about m.

[0010]

According to the honing method of the cylinder block according to the first aspect of the present invention, when honing the cylinder bore of the cylinder block, the arrangement direction and the arrangement direction of the cylinder bore toward the center of the cylinder bore are located at the upper end of the outer wall of the cylinder bore. When the honing is performed by applying loads from orthogonal directions, the portion of the cylinder bore that is difficult to deform when assembling the cylinder block, that is, the portion located on the front, rear, left and right sides of the engine increases, and other cylinder blocks are removed. The margin for easily deforming the cylinder bore during assembling is reduced.

That is, honing is performed in consideration of the deformation of the cylinder bore that may occur when assembling the cylinder block. When assembling the cylinder block, the roundness of the cylinder bore is reduced even if the cylinder bore is deformed by the head bolt tightening load. Will be improved,
In addition, since a load is applied to the upper end of the outer wall of the cylinder bore, the roundness of the upper portion of the cylinder bore, which greatly affects the engine performance (oil consumption), is particularly improved.

In the honing apparatus according to the second aspect of the present invention, the load is applied to the upper end of the outer wall of the cylinder bore toward the center of the cylinder bore from the direction in which the cylinder bores are arranged and the direction orthogonal to the arrangement direction. When the cylinder bore is honed, the allowance for the easily deformable part of the cylinder bore when assembling the cylinder block is smaller than the allowance for the parts located on the front, rear, left and right sides of the engine. As a result, even when the cylinder bore is deformed, the roundness of the cylinder bore, especially the roundness of the upper portion of the cylinder bore is improved.

In the honing device according to the third aspect of the present invention, since the honing device is configured as described above, the hydraulic source mounted on the honing device can be used when the load applying mechanism is operated, and the driving source for the load applying mechanism is used. Therefore, the processing cost can be reduced by the amount that is not required separately.

In the honing apparatus according to the fourth aspect of the present invention, since the above-described configuration is employed, if the annular elevating body is operated and mounted on the upper end of the cylinder bore, the load-loading mechanism is set and the coolant is removed. The supply setup will be completed, and as a result, it will be possible to easily respond to automation.In addition, since there is no need to provide a separate coolant supply facility, it can also contribute to reducing equipment costs. Become.

[0015]

According to the honing method for a cylinder block according to the first aspect of the present invention, the above-described configuration is adopted.
Even if the cylinder part of the cylinder block does not adopt the double structure, the roundness of the cylinder bore when assembling the cylinder block, especially the engine performance (oil consumption)
, Which can greatly improve the roundness of the upper portion of the cylinder bore, which greatly reduces the cost of the engine and the output of the engine.

In the honing device according to the second aspect of the present invention, since the above-described configuration is employed, the roundness of the cylinder bore when assembling the cylinder block, particularly,
It is possible to improve the roundness of the upper portion of the cylinder bore, and it is possible to achieve a very excellent effect that it is possible to reduce the product cost and improve the output of the engine.

The honing device according to the third aspect of the present invention has the above-described configuration, so that the processing cost can be reduced. The honing device according to the fourth aspect of the present invention has the above-described configuration. Therefore, in addition to being able to easily cope with automation, a very excellent effect that it is possible to greatly contribute to reduction in equipment cost is brought about.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of a honing device for a cylinder block according to the present invention.

As shown in FIG. 1, this honing device 1
Is set at the upper end of a cylinder bore SB of a cylinder block S shown in FIG. 2 and a honing head 3 having a cylindrical shape and a plurality of grindstones 2 arranged at predetermined intervals on an outer peripheral surface. At the upper end, toward the center P of the cylinder bore SB, the arrangement direction of the cylinder bores SB (the front-rear direction of the cylinder block S (the left and right arrow direction in the figure)) and the direction orthogonal to the arrangement direction (the left-right direction of the cylinder block S (the upper (A direction indicated by an arrow in FIG. 3) is provided.

The load applying mechanism 10 comprises four load applying cylinders 11 set at approximately 90 ° intervals at the upper end of the cylinder bore SB, and these load applying cylinders 1
1 and a pipe 5 and a cylinder cover 12, respectively, from a hydraulic source 4 housed in
The piston 13 which moves in the radial direction of the cylinder bore SB by the hydraulic pressure supplied through the communication hole 12a of the cylinder 13 and extends downward from each end of the piston 13 and is provided with the cylinder bore SB via the cushioning material 14 when the hydraulic pressure is supplied. A load load plate (pressing body) 15 which comes into contact with the upper end of the outer wall Sw and presses it toward the center P, the hydraulic power source 4 and the load-loading cylinder 1
1 is provided on each pipe 5 between the
Pressure regulator (hydraulic control unit) 16 for individually controlling the hydraulic pressure supplied to cylinder 1 and load-load cylinder 11
And a return spring 17 which is disposed between the bottom 11a and the load plate 15 to apply a return force to the piston 13.

In this case, the piston 1 of the load applying mechanism 10
Each of the four load-loading cylinders 11 containing the load-loading plate 3 and the load-loading plate 15 is integrally held by an annular lifting / lowering body 6 that can move up and down and can be placed on the upper end of a cylinder bore SB of a cylinder block S. As shown in FIGS. 3 and 4, a coolant supply path 21 formed by closing a groove 6 a formed in an arc shape with a cover 6 b is provided between the load-carrying cylinders 11 of the annular elevating body 6. A plurality of coolant nozzles 22 are provided in communication with the coolant supply passage 21 to enable coolant to be injected into the cylinder bore SB.

As shown in FIG. 5, the coolant is supplied to the coolant supply passage 21 through a coolant pipe 23 and a coolant introduction hole 24 communicating with a coolant supply source 20. , The coolant used for cooling is collected by a tray 25 arranged below the cylinder block S,
The coolant is returned to the coolant supply source 20 through the swarf removing unit 27 and the temperature control unit 28 in the coolant supply source 20.
, And is supplied to the coolant supply path 21 again.

Incidentally, reference numerals 18 and 19 in FIG. 1B both denote sealing materials.

When honing the cylinder bore SB of the cylinder block S by the honing apparatus 1 described above, first, the arrangement direction of the cylinder bore SB (the front-back direction of the cylinder block S) and the direction orthogonal to the arrangement direction (the cylinder block S). After setting the cylinder block S to a jig (not shown) in a state where the left and right directions correspond to the four load-loading cylinders 11 of the load-loading mechanism 10,
When the annular elevating body 6 is lowered and mounted on the upper end of the cylinder bore SB of the cylinder block S, the load
The load-loading cylinders 11 are set at predetermined positions at the upper end of the cylinder bore SB.

Next, hydraulic pressure is supplied from the hydraulic pressure source 4 to the four load-loading cylinders 11 of the load-loading mechanism 10 through the pipes 5 and the communication holes 12a of the cylinder cover 12, so that each piston 13 is brought into the cylinder bore. When each of the load plates 15 is moved in the radial direction of the SB, each of the load plates 15 comes into contact with the upper end portion of the outer wall Sw of the cylinder bore SB via the cushioning material 14 and presses toward the center P.
The outer wall Sw of the cylinder bore SB is deformed inward at four locations.

At this time, when the deformation amounts at the four locations of the outer wall Sw of the cylinder bore SB are different, the four pressure regulators 16 of the load loading mechanism 10 reduce the hydraulic pressure supplied to each load loading cylinder 11. Each deformation is adjusted to match each deformation amount.

In this state, when the honing is performed by rotating the honing head 3 while injecting the coolant from the plurality of coolant nozzles 22 of the annular elevating body 6 into the cylinder bore SB, the deformation of the cylinder bore SB during the assembly of the cylinder block S is performed. The portions that are difficult to perform, that is, the portions located on the front, rear, left, and right sides of the cylinder block S (engine) are increased, and other cylinder blocks S
In assembling the cylinder bore SB, the margin for easily deforming the cylinder bore SB is reduced.

After completion of the honing, the supply of the hydraulic pressure from the hydraulic pressure source 4 to the four load-loading cylinders 11 of the load-loading mechanism 10 is stopped, and the load-load plate 15 and the piston 13 To its original position.

As described above, in the honing apparatus 1 described above, honing is performed in consideration of the deformation of the cylinder bore SB that may occur when assembling the cylinder block S. Therefore, when assembling the cylinder block S, the honing is performed by the head bolt tightening load. Cylinder bore S
Even if B is deformed, the roundness of the cylinder bore SB is improved, and in addition, since a load is applied to the upper end of the outer wall Sw of the cylinder bore SB, the engine performance (oil consumption) is greatly reduced. The roundness of the upper part of the cylinder bore SB which influences is particularly improved.

In the honing apparatus 1, a load applying mechanism 1 for applying a load to the outer wall Sw of the cylinder bore SB is provided.
0 is operated by hydraulic pressure, the hydraulic load source 10 provided in the honing device 1 can be used when the load applying mechanism 10 is operated.
The machining cost can be reduced by the amount that no dedicated drive source is required separately.

Further, in the honing apparatus 1, all of the four load-loading cylinders 11 of the load-loading mechanism 10 are integrally held by the annular lifting / lowering body 6, and Since the coolant supply path 21 and the plurality of coolant nozzles 22 are provided between the cylinders 11, if the annular lifting / lowering body 6 is operated and mounted on the upper end of the cylinder bore SB, the four load The setting of the cylinders 11 is performed at the same time, and the setup for supplying the coolant is instantaneously completed. As a result, it is possible to easily respond to automation, and in addition, there is no need to provide a separate coolant supply facility. Therefore, it can greatly contribute to reduction of equipment cost.

The detailed construction of the cylinder block honing method and honing apparatus according to the present invention is not limited to the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing an embodiment of a honing device according to the present invention, and FIG. 1 (b) is an explanatory sectional view of a cylinder for load application of a load application mechanism.

FIG. 2 is an explanatory partial plan view of a cylinder block honed by the honing device shown in FIG. 1;

FIG. 3 is a partially enlarged plan explanatory view of an annular elevating body showing a coolant supply path and a coolant nozzle of the honing device in FIG. 1;

FIG. 4 is an explanatory sectional view based on the line AA in FIG. 3;

FIG. 5 is an explanatory view of a coolant circulation path of the honing apparatus shown in FIG. 1;

FIG. 6 is an explanatory sectional view of a conventional cylinder block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honing apparatus 2 Grinding stone 3 Honing head 6 Annular elevating body 10 Load applying mechanism 11 Load applying cylinder 15 Load applying plate (pressing body) 16 Pressure regulator (hydraulic control unit) 20 Coolant supply source 21 Coolant supply path 22 Coolant nozzle P Cylinder bore Center of cylinder C cylinder block SB cylinder bore Sw outer wall of cylinder bore

Claims (4)

[Claims] When honing a cylinder bore of a cylinder block having a plurality of cylinder bores, a load is applied to an upper end portion of an outer wall of the cylinder bore from an arrangement direction of the cylinder bores and a direction orthogonal to the arrangement direction toward the center of the cylinder bores. A honing method for a cylinder block while performing honing processing. 2. A honing apparatus for honing a cylinder bore of a cylinder block having a plurality of cylinder bores, comprising: a honing head having a cylindrical shape and a grindstone disposed on an outer peripheral surface; and a cylinder bore at an upper end of an outer wall of the cylinder bore. A honing device comprising: a load applying mechanism for applying a load toward a center from an arrangement direction of cylinder bores and a direction orthogonal to the arrangement direction. 3. A load-carrying mechanism comprising: a load-carrying cylinder set at an upper end of a cylinder bore at an interval of approximately 90 °; and a hydraulic pressure supplied to the load-load cylinder, which moves in a radial direction of the cylinder bore to move the outer wall of the cylinder bore. The honing apparatus according to claim 2, further comprising: a pressing body that presses the upper end of the spring toward the center; and a hydraulic control unit that controls a hydraulic pressure supplied to the load-loading cylinder. 4. A load-carrying cylinder of a load-loading mechanism,
A coolant supply passage communicating with a coolant supply source and a coolant supply passage communicating with the coolant supply passage are provided between the load lifting cylinders of the annular lift and are integrally held by an annular elevating body that can be mounted on the upper end of the cylinder bore. 4. The honing device according to claim 3, further comprising a coolant nozzle that is capable of being sprayed into the interior of the honing device.