JP2835727B2 - Sliding member having fastening member insertion hole - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding member having a fastening member insertion hole formed as a cast product, and in particular, is fixed to a holding member by a bolt passing through a bolt hole, and is used for another member. And a sliding member that comes into sliding contact with the sliding member.

2. Description of the Related Art Examples of such a sliding member include a brake disk of an automobile disk brake device and a flywheel attached to an end of a crankshaft of an automobile engine. The brake disc is fixed to the wheel hub with bolts, and during braking, a large braking torque acts due to the sliding contact relationship with the friction pad supported by the caliper, and the flywheel is bolted to the flange at the end of the crankshaft, Since the rear surface is used as a clutch friction surface, a large driving torque acts. These sliding members are required to have, for example, good wear resistance, good vibration damping characteristics, and good thermal conductivity, but are required to have the characteristics required for sliding members and the fixed parts having bolt holes formed. Characteristics may not always match.

In order to strengthen the surface of cast iron and cast steel products, powder of reinforcing metal is mixed in a solvent, applied to the inner surface of the mold, and the metal powder is melted by the molten metal poured into the mold. A method of forming a solid solution on the surface of a casting is considered, and a metal powder is applied to the surface of a previously cast metal member, and the surface of the metal member is melted by high-density energy.
There is known a method in which solidification is performed and a reinforcing metal is solid-dissolved on the surface.

However, according to this method, only the surface of the metal member can be reinforced, and thus the reinforcement over the inside of the metal member cannot be achieved.

Means for Solving the Problems and Effects The present invention relates to an improvement of a sliding member that overcomes such difficulties, and relates to a sliding member that is fixed to a holding member by a fastening member and slidably contacts another member. The moving member is formed as a flake graphite cast iron casting, and a large amount of Ni is provided on at least the fastening member insertion hole peripheral wall except for the sliding portion, as compared with other portions.
Is added and solid-dissolved.

In the present invention, the fixing member is fixed to the holding member,
In a sliding member which is in sliding contact with another member, a large amount of Ni as a reinforcing metal is added to and solid-dissolved in at least the peripheral wall portion of the fastening member insertion hole, except for the sliding portion, as compared with the other portion. Formed as a cast product, the characteristics of the sliding member can be improved, and at least the strength of the peripheral wall of the fastening member insertion hole can be sufficiently maintained, and the sliding member can be secured while maintaining the required strength. The thickness of the sliding member can be reduced by making the thickness of the local portion thinner than usual.

In the present invention, since the sliding member is made of flaky graphite cast iron and the reinforcing metal is made of Ni, it is possible to obtain a sliding member having sufficient strength while avoiding a large increase in cost. .

Further, in the present invention, since flaky graphite cast iron is used for the sliding member, a large amount of flaky graphite can be deposited on the sliding portion to enhance the vibration damping ability, and the fastening member insertion hole formed by the flake graphite deposition. Since a decrease in the strength of the peripheral wall can be compensated for by adding a large amount of Ni for reinforcement and solid solution, a brake disk having high braking performance and light weight can be obtained.

Still further, in the present invention, since the sliding member is a brake disk, a lightweight, high-strength brake disk having sufficient braking characteristics as a brake disk can be obtained.

Furthermore, in the present invention, since the sliding member is a flywheel, a flywheel having characteristics necessary for a flywheel and high strength can be obtained.

Further, when the present invention is applied to a brake disk or a flywheel and the braking capacity of the brake disk or the clutch capacity of the flywheel is to be increased, it is necessary to increase the strength of the peripheral wall portion of the fastening member insertion hole. By adding a large amount of strengthening Ni and dissolving it,
The required strength can be maintained without increasing the thickness of the peripheral wall of the fastening member insertion hole, and a large increase in the weight of the brake disc or flywheel can be avoided.

Embodiment 1 FIGS. 1 to 5 show a brake disc 1 of an automobile disc brake device according to an embodiment of the present invention. The brake disk 1 is a cast product made of flaky graphite cast iron (manufactured by JIS FC25), and is formed as a disk-shaped body having an opening 3 in the center.

In addition, the brake disc 1 slides in contact with a base wall 2 (outer diameter 152 mm, wall thickness 6 mm) and a cylindrical wall 6 (outer diameter 152 mm, wall thickness 6 mm) directly addressed to the wheel hub, and a friction pad of a caliper. It consists of a moving wall 7 (outer diameter 282 mm, wall thickness 21.6 mm), and a base wall 2
Has one opening 3 (inner diameter 64mm), four bolt holes 4 (inner diameter 12.5mm) and two setscrew holes 5 (inner diameter 6.5mm), which are fixed to the wheel hub by screws passing through the set screw holes 5. At the same time, the wheel is fixed to the wheel hub together with the wheel by a screwing relationship between the bolt and the nut on the wheel hub side passing through the bolt hole 4. The sliding wall 7 of the brake disc 1 is a double-walled structure having a large number of ventilation holes 8 formed in a radial direction, and the heat of the sliding wall 7 whose temperature has increased due to frictional heat generated during braking is large. The air is efficiently radiated to the surroundings together with the airflow flowing through the ventilation holes 8 defined by the partition walls 9.

To configure the brake disc 1 as described above,
A thin ring-shaped foam 2a with an outer diameter of 150 mm, an inner diameter of 70 mm, and a wall thickness of 5 mm in advance
Is set, and after casting, the bolt hole 4 and the screw hole 5 are formed by machining.

Sliding wall 7 of brake disk 1 formed in such a shape
The base wall 2 of the brake disc 1 is entirely reinforced by the addition of Ni as a reinforcing metal. Ni addition is performed by installing a Ni foam at a predetermined position in a mold for casting the brake disc 1. Further, without strengthening the entire base wall 2, only the peripheral wall portion of the bolt hole 4 where stress concentration tends to occur is particularly required.
Enhancing with Ni is also effective in reducing the amount of expensive Ni used.

Embodiment 2 FIGS. 6 and 7 show a flyhole 10 of an automobile engine according to another embodiment of the present invention. Flyhole 10
Is a flaky graphite cast iron casting (JIS FC25)
It is formed as a disc-shaped body having an opening 12 in the center. The flyhole 10 is fixed to the flange at the end of the crankshaft with a plurality of bolts at a bolt hole 13 portion, and one surface of a portion located outside the base 11 having the opening 12 and the bolt hole 13 is formed on a clutch friction surface 14. Used as And
The portion of the base 11 surrounded by the two-dot chain line and the portion where the hatching intersects are reinforced by the addition of Ni as a reinforcing metal, and although a large stress is generated in the base 11, the wall thickness of the base 11 is larger than that of a normal case. Can also be reduced, and the weight of the flyhole 10 as a whole can be reduced.

Note that Ni addition is performed by installing a Ni foam at a predetermined position in a mold for casting the flyhole 10.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an automobile brake disc to which the present invention is applied, FIG. 2 is a rear view thereof, and FIG. 3 is II in FIG.
4 and 5 are sectional views taken along the line IV-IV in FIG.
FIG. 6 is a front view of another embodiment of the present invention, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 1 ... brake disc, 2 ... base wall, 3 ... opening, 4
... bolt holes, 5 ... screw holes, 6 ... cylindrical wall, 7 ...
... Sliding wall, 8 ... Vent hole, 9 ... Partition wall, 10 ... Flywheel, 11 ... Base, 12 ... Opening, 13 ... Bolt hole, 14
...... Clutch friction surface.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 19/00, 19/02 F16F 15/30 F16D 65/12

Claims (3)

(57) [Claims] 1. A sliding member fixed to a holding member by a fastening member and slidably contacting another member, wherein the sliding member is formed as a flake graphite cast iron casting, and at least the fastening member except for the sliding portion. A sliding member having a fastening member insertion hole, wherein a larger amount of Ni is added to and solid-dissolved in the peripheral wall of the insertion hole compared to other portions. 2. The sliding member having a fastening member insertion hole according to claim 1, wherein said sliding member is a brake disk. 3. A sliding member having a fastening member insertion hole according to claim 1, wherein said sliding member is a flyhole.