JPS622666Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a shift fork that is fitted into a circumferential groove of a coupling sleeve of a gear transmission to perform gear shifting.

[Prior Art] As a conventional shift fork for a transmission, there are those shown in FIGS. 1 to 3 for gear transmissions of automobiles and the like. For example, when shifting a synchronous mesh transmission to 1st gear, when the shift lever is put into 1st gear,
Due to the movement of the shift fork 1 fixed to the shift rod 2 via the coupling mechanism, the coupling sleeve 3 presses the baulk ring 5 against the cone surface 7 of the first gear 6 in the direction of arrow C, and the synchronizing action as a transmission ends. The clutch gear 8 of the 1st gear 6 completely engages with the clutch gear 8, and the gear shift is completed. When shifting in this manner, a large load is applied to the sliding surface 9 between the sliding claw portion 1a of the shift fork 1 and the circumferential groove of the coupling sleeve 3, so that splashes due to the direction of gear rotation D and oil gutter of the gear case 4 are generated. Lubricating oil is supplied to the sliding surface by dripping from 10 and immersion in oil level E.

[Problems to be solved by the invention] However, in the shift fork 1 of such a conventional transmission, lubricating oil is supplied to the sliding surface 9 between the shift fork 1 and the coupling sleeve 3 in the B part. Since the coupling sleeve 3 is rotating, there is a high rate of lubricant being blown away.Especially when operating the gear shift lever quickly with great force or using a high-speed gear, the amount of lubricant may be insufficient, causing damage to the sliding surface. 9. Abnormal wear and seizure are more likely to occur. As a countermeasure, it has been proposed to use abrasion-resistant chrome plating or other surface treatment on the sliding surface 9 of the sliding claw portion 1a of the shift fork 1, or to use a sintered alloy, but these methods are expensive and do not have sufficient effect. There was a drawback that I couldn't get it. In addition, there are some types in which grooves, recesses, or holes are provided on the sliding surface 9, but these are passive and insufficient as a supplement for lubricating oil.

The present invention solves the above-mentioned drawbacks of the conventional technology by providing a shift fork with a structure that forms a collection part for dripping or splashed lubricating oil and sends the oil to the sliding surface of the shift fork. For the purpose of removing this problem, we adopted the following configuration.

[Means for Solving the Problems] That is, the gist of the present invention is to provide a sliding pawl portion that fits into a circumferential groove of a coupling sleeve, a supporting bone portion that supports the sliding pawl portion, and a supporting bone portion that supports the sliding pawl portion. A shift fork for a transmission equipped with: an oil collecting wall wider than the sliding claw part is formed at the tip of the supporting bone part so as to protrude at least in the circumferential direction of the coupling sleeve. transmission shift fork. It is in.

[Function] The oil collecting wall is wider than the sliding claw portion and protrudes at least in the circumferential direction. Therefore, even if the lubricating oil that is on the coupling sleeve or that has been dripped onto the coupling sleeve is splashed away by the rotation of the coupling sleeve, the oil collecting wall is located further ahead than the part on which the sliding claw is sliding. Since the lubricating oil is located in the middle, it captures the lubricating oil that is splashed away, accumulates it, and supplies it to the sliding claw. The higher the speed of the coupling sleeve, the higher the pressure supplied, which compensates for the lack of lubricant on the sliding surfaces.

Next, an embodiment of the present invention will be described. The present invention is not limited to these, but includes various embodiments without departing from the gist thereof.

[Example] An example of the present invention will be described with reference to the drawings shown in FIGS. 4 to 11.

4 and 5 show a shift fork 30 according to a first embodiment of the present invention, in which a sliding pawl 31a for sliding on the coupling sleeve 3 is similar to the conventionally used shift fork. Leave it as it is, and insert the supporting bone portion 3 wider than the sliding claw portion 31a.
An oil collection wall 32 is provided in the form of a slightly extended tip of 1b. The length of this oil collection wall 32 is determined by taking into consideration the amount of scattered oil that needs to be collected and the position of the oil gutter 10 so that the oil droplets dripping from the oil gutter 10 do not fall only on the upper surface of the oil collection wall 32. It can be decided as appropriate.

In the shift fork 30 configured as described above, dripped oil and splashed oil hit the oil collection wall 32 due to the rotation of the gear in the D direction, and are collected on the sliding surface between the sliding claw portion 31a and the coupling sleeve 3. Refueled.

Next, regarding other embodiments of the present invention, Figures 6 to 1
This will be explained with reference to Figure 1.

Shift fork 40 of the second embodiment shown in FIG.
In the first embodiment, there is a possibility that oil may escape from the support bone 31b at the end of the shift fork 30 and both sides of the oil collecting wall 32, so in order to prevent this, walls are installed on both sides of the oil collecting wall 42. 43 is provided, and an oil collection groove 44 surrounded by a U-shaped wall is provided, reducing oil escape and increasing oil supply to the sliding surface 9.

Shift fork 50 of the third embodiment shown in FIG.
In this case, the amount of lubricating oil collided with and captured by the oil collecting wall 52 at the tip of the support bone portion 51b is further increased than in the shift fork 40 of the second embodiment shown in FIG. It is constructed to prevent overflowing and escaping in the circumferential direction, and has walls in four directions, and one wall is connected to the end surface of the supporting bone portion 51b flush with the end surface of the sliding claw portion 51a. An oil collection tank 53 is provided with an opening surface on the opposite surface of the end surface and the surface facing the coupling sleeve 3. That is, the oil collecting wall 52 is configured to protrude in the circumferential direction of the coupling sleeve 3 and also in a direction opposite to the coupling sleeve 3. This reduces the amount of lubricating oil that escapes, further increasing the amount of oil stored in the oil collecting section and the amount of oil sent to the sliding surfaces.

Shift fork 60 of the fourth embodiment shown in FIG.
In this case, an oil hole 64 inclined toward the sliding claw portion 61a is provided in a circumferentially facing wall 63a of an oil collecting tank 63 having the same shape as the shift fork 50 of the third embodiment shown in FIG. This hole is connected to an oil hole 65 that is drilled through the movable claw portion 61a in the axial direction, and the oil collected in the oil collection tank 63 is passed through the oil hole 6.
4 and 65, and the oil is reliably delivered to the sliding surface. In addition, the direction of the oil hole, the size of the diameter, and
Just change the number.

Shift fork 70 of the fifth embodiment shown in FIG.
In this case, both sliding surface portions 71c of the sliding claw portion 71a having the same shape as the shift fork 30 of the first embodiment shown in FIG. An oil groove 75 is formed obliquely toward the center of rotation of the ring sleeve 3, and the oil adhering to the oil collection wall 72, which is an oil collection part, flows into the oil groove 75 through the end face of the sliding claw part 71a. It is supplied to the sliding surface between the sliding claw portion 71a and the coupling sleeve 3.

Effects of the invention This invention has the following features:
A wall that collects dripping or splashed lubricating oil, which is wider than the sliding claw part, is formed to protrude at least in the circumferential direction of the coupling sleeve, and actively applies a large amount of lubricating oil to the sliding surface of the sliding claw part of the shift fork. The shift fork collects and supplies lubricating oil to the required amount even under harsh conditions, such as when the sliding surfaces of the coupling sleeve and shift fork come into contact with each other under high load and at high speeds during gear shifts. This has the effect of significantly improving durability by eliminating problems such as seizure and abnormal wear on the sliding surfaces.

Further, the present invention is an effective shift fork that can obtain the above-mentioned great effects by simply improving the conventional shift fork by simply providing an oil collecting wall at the end thereof.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional shift fork incorporated into a transmission, Figure 2 is a sectional view of the main part taken along line A-A in Figure 1, and Figure 3 is an enlarged view of section B in Figure 2. A perspective view, FIG. 4 is a front view showing the state of use of the first embodiment of the present invention, and FIGS. 5 to 9 are perspective views showing each embodiment of the shift fork of the present invention with parts corresponding to those in FIG. 3. It is a diagram. 3... Coupling sleeve, 21... Lubricating oil splash, 30, 40, 50, 60, 70... Shift fork, 31a, 41a, 51a, 61a, 7
1a...Sliding claw portion, 31b, 41b, 51b, 6
1b, 71b...Supporting bone part, 32, 42, 52,
62, 72...Oil collection wall, 44...Oil collection groove, 53,
63... Oil collection tank, 64, 65... Oil hole, 75...
oil groove.

Claims (1)

[Claims for Utility Model Registration] A shift fork for a transmission comprising a sliding pawl that is fitted into a circumferential groove of a coupling sleeve, and a support bone that supports the sliding pawl, 1. A shift fork for a transmission, characterized in that an oil collecting wall wider than the sliding pawl portion is formed at a tip of the portion so as to protrude at least in the circumferential direction of the coupling sleeve.