JP6086844B2 - Synchronizer ring and manufacturing method thereof - Google Patents

Description

  The present invention relates to a synchronizer ring in which a friction material containing a carbon material as a component is attached to a friction engagement surface with a counterpart member by thermoforming.

  A synchronizer ring is a part that is built into a manual transmission of an automobile, etc., and synchronizes the rotation of two meshed gears when switching gears so that gears can mesh smoothly. Shaped member. In the synchronizer ring, a friction material is affixed to a friction engagement surface with a counterpart member, specifically, an inner peripheral side, an outer peripheral side, or both of the base material. This friction material is processed into a taper shape in accordance with the engagement surface of the mating member.

  Examples of the friction material for the synchronizer ring include a thermal spraying method in which a raw material is melted and sprayed onto a base material, a non-woven friction material, a paper friction material, and a friction material containing 30 to 70% by weight of a carbon material as a component. Among them, the friction material containing 30 to 70% by weight of a carbon material as a component is pasted on a base material by thermoforming. This type of synchronizer ring (hereinafter simply referred to as “synchronizer ring”). Are disclosed in Patent Literatures 1 and 2.

JP-A-9-221553 JP 2006-249244 A Japanese Patent Laid-Open No. 9-254025

In Patent Literatures 1 and 2, the base material and the friction material (granule) are filled in the mold and heated to integrate the base material and the friction material, and then the friction material is tapered. A method of manufacturing a synchronizer ring is disclosed in which cutting is performed and then grooves are formed on the surface of the friction material.
Further, Patent Document 1 discloses a method of manufacturing a synchronizer ring in which a friction material is formed into a sheet shape, punched into a desired shape, or preformed into a ring shape and integrated with a base material. Yes.
As disclosed in Patent Documents 1 and 2, a friction material containing a carbon material of 30% by weight or more as a component is usually processed into a taper shape by cutting because the carbon material is hard. .

  By the way, the synchronizer ring is required to have a property of preventing the mating member from being seized, wear resistance, and a friction coefficient suitable for synchronizing, while improving the stick resistance, in other words, the synchronizer ring and the counterpart. When the frictional engagement state with the member is released, it is required to prevent the friction material of the synchronizer ring from sticking to the counterpart member in order to reliably release the torque transmission. This is because when the synchronizer ring is attached to the mating member, problems such as generation of shift lock and inability to change gears are caused.

  Whether or not the stick resistance is good can be determined by stick torque. The stick torque can be measured using a synchronizer ring unit tester. The lower the stick torque, the better the stick resistance. The synchronizer ring unit tester has a synchronizer ring and a mating member provided on the same axis, and the synchronizer ring is movable in the axial direction, and the mating member can be driven. Specifically, the measuring method applies a specific load to the synchronizer ring, presses it against a mating member having a specific rotational speed, and stops the rotation. At this time, the synchronizer ring is attached to the mating member. Next, in a state where no load is applied to the synchronizer ring, the mating member is rotated, and the torque when the synchronizer ring is peeled off from the mating member is measured. This measured value is the value of the stick torque. That is, the stick torque is a torque required to peel the synchronizer ring from the counterpart member.

  When a friction material containing 30% by weight or more of a carbon material as a component is processed into a tapered shape by cutting as in Patent Documents 1 and 2, the surface of the friction material is rough as shown in FIG. . If the surface of the friction material is rough, the friction material is caught by the mating member, so that stick torque increases and stick resistance deteriorates. Therefore, in order to flatten the surface of the friction material, wrapping is performed on the surface of the friction material after cutting using an apparatus as shown in Patent Document 3. As shown in Fig. 3 (b), the surface of the friction material that has been lapped is flatter than that that has not been lapped so that stick torque is reduced and stick resistance is improved. Can do.

  However, the lapping process not only requires a lapping-dedicated apparatus, but is also a complicated processing method. As a result, there is a problem that the manufacturing cost of the synchronizer ring increases.

  Therefore, in view of the above-described problems of the prior art, the present invention provides a synchronizer ring that further reduces stick torque and a method of manufacturing the same using a method that is simple and suppresses manufacturing costs without relying on lapping. The purpose is to provide.

The present invention includes an annular base material, a 30 to 70% by weight carbon material that is affixed to the base material and has a surface cut into a taper shape, a 10 to 40% by weight thermosetting resin, Heat while pressing a heating member against the surface of the friction material of the synchronizer ring having 5-30 wt% metal particles and a friction material containing 5-40 wt% inorganic fibers,
Synchronizer ring manufacturing method characterized by smoothing only the portion of the thermosetting resin on the surface of the friction material, or
An annular substrate;
30 to 70 wt% carbon material, 10 to 40 wt% thermosetting resin, and 5 to 30 wt% metal particles that are attached to the base material and the surface of which is cut into a taper shape, In a synchronizer ring having a friction material containing 5 to 40% by weight of inorganic fibers,
The above problem has been solved by a synchronizer ring characterized in that only the portion of the thermosetting resin on the surface of the friction material is smooth.

  According to the present invention, in a synchronizer ring including a friction material that includes 30 to 70% by weight of a carbon material, is affixed to a base material, and the surface is cut into a taper shape, Only by the operation of heating while pressing the heating member, that is, heating while pressing, the stick torque can be further reduced as compared with the conventional case. Therefore, wrapping is not necessary.

  It was also confirmed that when the heating member was pressed against the surface of the predetermined friction material and heated, only the portion of the thermosetting resin was smoothed on the surface of the friction material. This is clearly different from that in which all surfaces of the lapping-processed friction material including the thermosetting resin and the carbon material are smoothed by friction. For this reason, it is thought that it is one of the reasons which has said effect that only the part of the thermosetting resin of the surface of a friction material is smooth | blunted.

The longitudinal cross-sectional view of the synchronizer ring of this invention. The longitudinal cross-sectional view explaining the manufacturing method of the synchronizer ring of this invention. The graph which shows the roughness curve of the friction material surface layer of this invention and a prior art example. Measurement data of stick torque of the present invention and the conventional example.

  An embodiment of the present invention will be described with reference to FIGS. However, the present invention is not limited to this embodiment.

  As shown in FIG. 1, the synchronizer ring 10 has a base material 12 with 30 to 70 wt% carbon material, 10 to 40 wt% thermosetting resin, 5 to 30 wt% metal particles, The friction material 14 containing 5 to 40% by weight of inorganic fibers is pasted. Since the method of attaching the friction material 14 to the base material 12 is the same as the conventional method, the description thereof is omitted. The friction material 14 has oil grooves 14a (lateral grooves) and 14b (vertical grooves).

  Next, a method for manufacturing the synchronizer ring 10 will be described with reference to FIG. First, the friction material 14 is affixed to the base material 12, the surface is cut, and the friction material 14 having a tapered surface is affixed, and the base material 12 on which the oil grooves 14a and 14b are formed is prepared. To do. Next, the heating member 22 is heated and applied to the surface of the friction material 14. Next, pressure is applied to the iron plate 24 in the direction of the heating member 22 so that the heating member 22 is pressed against the surface of the friction material 14. In addition, it is good also as a structure which applies a pressure to the iron plate 24 direction with respect to the heating member 22, and presses with the iron plate 24, and is good also as a structure which applies a pressure to both the heating member 22 and the iron plate 24. FIG. When the heating member 22 is pressed against the surface of the friction material 14 for a predetermined time, the synchronizer ring 10 is removed from the heating member 22. Thus, since the present invention smoothes the surface of the friction material by heating and pressurizing, the manufacturing cost can be reduced more easily than the lapping process.

  The heating temperature of the heating member 22 is preferably 20 ° C. to 400 ° C., the pressing load of the heating member 22 against the friction material 14 is preferably 10 kgf to 3 tf, and the pressing time is preferably 5 seconds to 300 seconds.

  FIG. 3C shows the roughness curve of the surface layer of the friction material 14 of the synchronizer ring 10 manufactured by the above manufacturing method. 3A shows a surface roughness curve of a friction material (hereinafter simply referred to as “cut product”) in a state of being subjected to cutting, and FIG. 3B shows a lapping process. The surface roughness curve of the friction material in a state (hereinafter, simply referred to as a “wrapping product”) is shown. 3 (a) to 3 (c), as is clear from the range of X, it can be confirmed that the concavo-convex portions of the lapping product and the present invention are smoother than the cut product. (Arithmetic mean roughness (see JIS B 0601)) is reduced. Therefore, the stick torque is reduced in both the lapping product and the present invention compared to the cut product. In addition, when the present invention is compared with the wrapping product, the present invention shows that Rv (maximum valley depth (see JIS B 0601)) is indicated by a symbol Y in FIGS. Is low). This is because when the pressure is applied while heating, the thermosetting resin is fluidly deformed, the convex portion thereof is smoothed, and the depth of the valley portion becomes shallow as the entire friction material. Further, as observed by an optical microscope, the surface of the wrapping product is smoothed as a whole, including the carbon material part and the thermosetting resin part. It has been confirmed that only the portion of the thermosetting resin on the surface is smoothed, and the portion of the carbon material is kept in the state after cutting.

  FIG. 4 shows the cut torque, the lapping product, and the stick torque measured using the synchronizer ring unit tester of the present invention. The measurement conditions are the mating member rotation speed: 1000 rpm, the synchronizer ring pressing load: 1000 N, and the peeling rotation speed: 5 rpm. As is apparent from the figure, it can be seen that in both the first cycle and the 30th cycle, the stick torque of the present invention is lower than that of the cut product and the lapping product. Specifically, the stick torque of the present invention is about 43% in the first cycle, about 37% in the 30th cycle, and about 9%, 30 cycles in the first cycle compared to the lapping product. It is reduced by about 23%. This means that the present invention has improved stick resistance over both the cut and lapped products. Experiments have also shown that the present invention has the advantage of a higher coefficient of friction than the wrapping product. This is considered to be due to the fact that the portion of the carbon material on the surface of the friction material remains in the state after cutting.

  As described above, according to the present invention, it is possible to provide a synchronizer ring in which stick torque is further reduced and a manufacturing method thereof without depending on lapping.

10 Synchronizer ring 12 Base material 14 Friction material 22 Heating member

Claims (5)

An annular base material, a 30 to 70 wt% carbon material, a 10 to 40 wt% thermosetting resin, and a 5 to 30 wt% affixed to the base material, the surface of which is cut into a taper shape. % Of the metal particles and a friction material containing 5 to 40% by weight of inorganic fibers and heated while pressing a heating member against the surface of the friction material of the synchronizer ring,
Smoothing only the thermosetting resin part of the surface of the friction material,
Synchronizer ring manufacturing method.   The method for manufacturing a synchronizer ring according to claim 1, wherein the pressing time of the heating member is 5 seconds to 300 seconds.   The method of manufacturing a synchronizer ring according to claim 1 or 2, wherein a pressing load of the heating member is 10 kgf to 3 tf.   The manufacturing method of the synchronizer ring in any one of Claim 1 to 3 whose heating temperature of the said heating member is 20 to 400 degreeC. An annular substrate;
30 to 70 wt% carbon material, 10 to 40 wt% thermosetting resin, and 5 to 30 wt% metal particles that are attached to the base material and the surface of which is cut into a taper shape, In a synchronizer ring having a friction material containing 5 to 40% by weight of inorganic fibers,
Only the portion of the thermosetting resin on the surface of the friction material is smooth,
Synchronizer ring.

Images