JPS6258405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronous meshing device for an automobile transmission, and in particular, a wear-resistant plastic is provided on the inner periphery of a fork engagement groove of a coupling sleeve in which a shift fork for a gear shift engages and slides. The present invention relates to a coupling sleeve for a synchronized meshing device for a transmission, on which a wear-resistant layer is formed.

Conventionally, if we take a synchronized mesh device of this type of automobile transmission, for example, a Warner type synchronized mesh device,
The shift operation of the shift lever moves the shift fork in the axial direction via the fork rod, and the shift fork engages with the fork groove formed on the outer circumferential surface of the coupling sleeve of the synchronous meshing device that rotates together with the main shaft. Because there is
The coupling sleeve is moved in the axial direction by the shift fork, and synchronized with the transmission gear which is rotatably inserted into the main shaft, thereby transmitting the rotational force of the main shaft to the transmission gear.

By the way, since the shift fork engages with the fork groove of the coupling sleeve that is being rotated by the main shaft, the shift fork is pressed against the side surface of the fork groove during gear shifting and comes into sliding contact, causing wear. Therefore, conventionally, the shift fork side is hardened, chrome plated, or coated with nylon to prevent wear caused by sliding contact.

However, in order to perform wear-resistant treatments such as hardening and chrome plating on the shift fork side, dedicated treatment equipment is required, which increases the number of manufacturing steps and tends to be expensive.

The present invention has been made by focusing on such conventional problems, and in order to prevent wear of the shift fork that engages with the coupling sleeve at a low cost, the present invention has been developed by forming a material on the outer circumferential surface of the coupling sleeve. The present invention aims to solve the above-mentioned problems by forming a wear-resistant layer by adhering a wear-resistant plastic on the inner periphery of the fork groove.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is an explanatory diagram showing, in half cross section, one embodiment of a warner type synchronous meshing device using a coupling sleeve of the present invention.

First, to explain the configuration, reference numeral 1 denotes a main shaft, and gears 4 and 4 are connected to the central spline shaft portion 1a and to the shaft portions on both sides of the synchro hub 2 via bearings 3 and 3'.
5 is rotatably inserted into the shaft. The synchro hub 2 also has splines cut in the axial direction on its outer periphery, and a coupling sleeve 6 is fitted onto the outer periphery splines so as to be movable in the axial direction.
Further, the synchro hub 7 has three notches parallel to the axial direction, and inserts 7 are inserted into these notches.
The insert 7 is supported in the radial direction by a spread spring 8, is engaged in the inner groove of the coupling sleeve 6 in the state shown, and is movable in the radial and axial directions against the spread spring 8. It is installed. Furthermore, clutch gears 4a and 5a are integrally formed in each of the gears 4 and 5, and cone sliding surfaces 9 and 10 are formed on the end faces of the clutch gears 4a and 5a. Each of the clutch gears 4a and 5a and the synchro hub 2
There is a synchro ring (balk ring) 1 between
3, 13' are interposed, and synchro rings 13, 1
Clutch gear 4 on the gears 4 and 5 side is on the outer periphery of 3'.
Clutch gears 13a, 1 with the same pitch as a, 5a
3a', and a conical sliding surface 1 facing the conical sliding surfaces 9, 10 on the gears 4, 5 side is formed on the inside.
1 and 12 are formed.

On the other hand, a U-shaped fork groove 14 is formed on the outer peripheral surface of the coupling sleeve 6, and the fork groove 14 is provided with a fork groove 14.
A shift fork 16 fixed to the fork groove 14 is fitted into the fork groove 14, and a wear-resistant layer 18 made of a wear-resistant plastic material that will be explained later is formed on the inner surface of the fork groove 14. It is in sliding contact with the inner wear-resistant layer 18.

FIG. 2 shows the coupling sleeve 6 taken out from the embodiment shown in FIG. Show the diagram.

That is, the coupling sleeve 6 is provided with a U-shaped fork groove 14 around the entire circumference on its outer circumference, and the inner circumference of the fork groove 14 is made of wear-resistant plastic such as nylon 66. A wear-resistant layer 18 is applied.

The wear-resistant layer 18 can be easily formed on the fork groove 14 by molding using a plastic injection molding machine. Further, the thickness of the wear-resistant layer 18 is set to exceed the amount of wear in a 100,000-hour durability test required for this type of transmission.

On the other hand, as described above, since the wear-resistant layer 18 made of wear-resistant plastic is integrally formed in the fork groove 14 of the coupling sleeve 6, the shift fork 16 that is engaged with the fork groove 14 is hardened. There is no need to apply anti-wear treatment such as chrome plating or chrome plating.

Next, the action will be explained.

In FIG. 1, the shift fork 16 is moved by the axial movement of the fork rod 15 by operating the shift lever, and the shift fork 16 is engaged with the fork groove 14 of the coupling sleeve 6.
By moving to the right or left, the coupling sleeve 6 also moves in the axial direction, and synchronized meshing for transmitting the rotation of the main shaft 1 to the gear 4 or 5 is performed. In this shift operation, when the shift fork 16 moves, the fork groove 1 of the coupling sleeve 6 rotating together with the main shaft 1
The shift fork 16 is pressed against and slides against the side surface of the wear-resistant layer 18 deposited inside the shift fork 4 . At this time, since the shift fork 16 is in sliding contact with the wear-resistant layer 18 made of wear-resistant plastic, almost no wear occurs due to the sliding contact, and the wear-resistant layer 18 is also made of a wear-resistant plastic material. Therefore, wear due to sliding contact is minimal.

Furthermore, since the sliding contact of the shift fork 16 during shifting is the sliding contact between the metallic shift fork 16 and the plastic wear-resistant layer 18, it is possible to reduce the abrasion resistance and the sliding contact noise. .

On the other hand, when the coupling sleeve 6 is pushed to the left, the side surface of the insert 7 slides on the synchronized ring 13 and rotates synchronously, causing the coupling sleeve to engage the clutch gear 13a of the synchronized ring. When the spline 6 is bitten and the insert 7 is pushed further, the conical sliding surface 11 of the synchro ring 13
slides against the cone sliding surface 9 on the gear 4 side and generates friction torque, and when the synchronizer ring 13 is pushed further and is completely synchronized with the clutch gear 4a, the coupling sleeve 6 pushes the insert 7 against the spread spring 8. Push down to gear 4 clutch gear 4
a, the synchronous meshing is completed, and the rotational force of the main shaft 1 is transmitted to the gear 4.

Although the above-mentioned embodiment takes a Warner type synchronizer as an example, the present invention is not limited thereto, and the same applies to a coupling sleeve used in a pin type synchronizer. It can be applied to

As described above, according to the present invention, a synchronizing mesh device for a transmission is configured such that the synchronizing meshing device for a transmission is moved in the axial direction by engagement of a shift fork linked to the operation of a shift lever to perform synchronizing meshing with a transmission gear. In the ring sleeve, a wear-resistant layer made of a wear-resistant plastic material is molded on the inner peripheral surface of the engagement groove of the shift fork formed on the outer peripheral surface of the coupling sleeve, so that it does not engage with the engagement groove of the coupling sleeve. There is no need to perform wear-resistant treatments such as hardening, chrome plating, or plastic coating on the shift fork side, and the formation of the wear-resistant layer on the fork engagement groove can be easily made by injection molding of plastic, reducing costs. Furthermore, since the metal shift fork is in sliding contact with the wear-resistant layer made of plastic material, the sliding resistance and sliding noise of the shift fork during shift operations can be reduced. This effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a warner type synchronous meshing device using the coupling sleeve of the present invention in a half section in the axial direction, Fig. 2 is an explanatory diagram showing the coupling sleeve of the present invention, Fig. 3 2 is a half sectional view taken along the line AA in FIG. 2, and FIG. 4 is a partial sectional view taken along the axial direction of the coupling sleeve. 1... Main shaft, 1a... Spline shaft, 2... Synchro hub, 3, 3'... Bearing, 4, 5... Gear, 6... Synchro sleeve, 7... Insert, 8... Spread spring, 9, 10... Cone sliding surface, 11, 12
...Conical sliding surface, 13, 13'... Synchro ring (balk ring), 4a, 5a, 13a, 1
3'a...Clutch gear, 14...Fork groove,
15...Fork cloth, 16...Shift fork, 18...Abrasion resistant layer.

Claims (1)

[Scope of Claims] 1. In a coupling sleeve of a synchronous meshing device for a transmission, which is moved in the axial direction by engagement of a shift fork in conjunction with the operation of a shift lever, and performs synchronous meshing with a transmission gear, the coupling sleeve includes: A coupling sleeve for a synchronous meshing device for a transmission, characterized in that a wear-resistant layer made of a wear-resistant plastic material is molded on the inner peripheral surface of an engagement groove of a shift fork formed on the outer peripheral surface of the sleeve.