JPH0612292Y2 - Lubrication structure of gear type transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lubricating structure for a gear type transmission, and more specifically, lubrication of a thrust bearing provided between an input shaft and an output shaft of the gear type transmission. Regarding the structure.

(Problems to be Solved by Conventional Techniques and Inventions) Generally, a gear type transmission has an input shaft connected to an engine through a clutch and an input shaft that is arranged coaxially in series with the input shaft. An output shaft that is rotatably supported at the end of, for example, via a roller bearing, a counter shaft that is disposed parallel to the input shaft and the output shaft, and that constantly meshes with the input shaft and rotates with the input shaft, And a plurality of synchronizers for connecting the shaft to the input shaft and the counter shaft,
The synchronizer for connecting the output shaft to the input shaft is provided with an input shaft side clutch gear integrally provided on the input shaft and a clutch hub fixed to the output shaft (actually disclosed in Japanese Utility Model Laid-Open No. 56-11).
1353).

In this type of gear type transmission, if the output shaft is supported only by the roller bearing with respect to the input shaft, the strength against thrust load will be insufficient, so a thrust bearing is provided between the input shaft and the output shaft. Will be required.

Therefore, it is conceivable to interpose a thrust bearing between the input shaft side clutch gear fixed to the input shaft and the clutch hub fixed to the output shaft. Since it is difficult for the lubricating oil to enter into the casing that houses the machine, the thrust bearing may be insufficiently lubricated, which may cause early wear.

Therefore, the present invention provides a lubrication structure for a gear type transmission, which can maintain the lubricity of a thrust bearing provided between an input shaft side clutch gear and an output shaft side clutch hub of a synchronizer with a simple structure. The purpose is to

(Means and Actions for Solving Problems) In order to achieve the above object, the present invention has the following configuration. That is, an input shaft, an output shaft arranged coaxially with the input shaft in series and rotatably supported at an end of the input shaft, and an input shaft arranged parallel to the input shaft and the output shaft. And a plurality of synchronizers for connecting the output shaft to the input shaft and the counter shaft, and a synchronizer for connecting the output shaft to the input shaft. In a gear type transmission equipped with a thrust bearing interposed between an input shaft side clutch gear integrally provided on a shaft and a clutch hub fixed to an output shaft, in the input shaft side clutch gear of the synchronizer, An oil hole for guiding the lubricating oil introduced into the gap between the meshing portion of the input shaft and the counter shaft and the clutch gear on the input shaft side to the thrust bearing is formed.

In the lubrication structure of the gear type transmission having the above configuration,
Since the lubricating oil introduced into the gap between the meshing portion of the input shaft and the counter shaft and the clutch gear can be guided to the thrust bearing between the clutch gear and the clutch hub by the oil hole formed in the clutch gear, The thrust bearing can be kept in a lubricated state. Moreover, since it is a simple structure in which the oil hole is formed through the clutch gear,
It is possible to prevent early wear of the thrust bearing at low cost.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The gear type transmission includes an input shaft 3 rotatably supported by a casing 1 via a bearing 2, and the input shaft 3 is connected to an output shaft of an engine via a clutch.

The output shaft 4 of the gear type transmission is coaxially arranged in series with the input shaft 3, and is rotatable via a pilot bearing (roller bearing) 5 in a guide hole 3a formed at the end of the input shaft 3. Supported by.

The counter shaft 6 is arranged parallel to the input shaft 3 and the output shaft 4, and is rotatably supported by the casing 1 via a bearing 7. The drive gear 8 integrally provided on the input shaft 3 always meshes with the counter gear 9 integrally provided on the counter shaft 6. Therefore, the counter shaft 6 always rotates together with the input shaft 3. Normally, the counter shaft 6 is disposed below the input shaft 3 and the output shaft 4, and the lubricating oil hole accumulated in the casing 1 is scraped upward to lubricate the input shaft 3 and the output shaft 4 and the like. It also plays the role of supplying oil.

Third speed drive gear 10 integrally provided on the counter shaft 6.
Is a third speed longitudinal gear 1 rotatably provided on the output shaft 4.
Always in mesh with 1.

In the illustrated embodiment, when the input shaft 3 is directly connected to the output shaft 4 via the synchronizer 12, the fourth speed state is established, and the third speed is established.
The third speed state is established when the speed vertical motion gear 11 is connected via the synchronizer 12. Although the gear type transmission is provided with a synchronizing device for obtaining other shift states (first speed, second speed, fifth speed, reverse, etc.), illustration and description thereof are omitted.

Synchronous device 1 for switching between fourth speed state and third speed state
Reference numeral 2 denotes a clutch hub 13 fixed to the output shaft 4, a sleeve 14 slidably and non-rotatably provided on the outer periphery of the clutch hub 13, and provided between the clutch hub 13 and the sleeve 14. Synchronizer key 15
And a ring-shaped key spring 1 for biasing the synchronizer key 15 outward in the radial direction of the clutch hub 13.
6 and.

On the other hand, the clutch gear 1 having cone portions whose outer circumferences are conically inclined in the input shaft 3 and the third speed vertical motion gear 11 respectively.
7, 18 are fixed, these clutch gears 17,
1 synchronizer ring for each of the 18 cones
9 and 20 are slidably and rotatably fitted.

The synchronizer 12 is known per se, and when the sleeve 14 is moved to the clutch gear 17 side provided on the drive gear 8 by a shift operation, the synchronizer ring 19 receives a pressing force and the inner peripheral cone thereof is pressed. The surface frictionally contacts the cone portion of the clutch gear 17 to perform a synchronizing action, and when the synchronization is completed, the sleeve 14 further advances and meshes with the clutch gear 17, thereby directly connecting the input shaft 3 and the output shaft 4. Put in a state.

As shown, the clutch gear 1 provided on the input shaft 3
7 and a clutch hub 13 fixed to the output shaft 4, a thrust bearing 21 is provided, and the thrust bearing 21 can support the thrust load acting between the input shaft 3 and the output shaft 4. You can do it.

As can be seen, the clutch gear 17 and the clutch hub 1
Since the gap between the casing 1 and the bearing 3 is surrounded by the components of the synchronizer 12, the lubricating oil in the casing 1 is less likely to be supplied to the thrust bearing 21. Therefore, in the present invention, in order to guide the lubricating oil, which is introduced into the gap between the clutch gear 17 and the meshing portion of the drive gear 8 and the counter gear 9 to the clutch gear 17 fixed to the input shaft 3, to the thrust bearing 21. Oil holes 22 are formed.

Therefore, in the gear type transmission having the above-described configuration, the lubricating oil guided to the clutch gear 17 through the oil hole 22 is introduced into the gap between the clutch gear 17 and the meshing portion between the drive gear 8 and the counter gear 9. Thrust bearing 21
Therefore, the thrust bearing 21 can be kept in a lubricated state. Moreover, the clutch gear 17
Since the oil hole 22 is formed so as to penetrate therethrough, it is possible to inexpensively improve the lubricity of the thrust bearing 21.

The number of oil holes 22 formed in the clutch gear 17 may be one, but a plurality of oil holes 22 may be provided.

(Effect of the Invention) As is apparent from the above description, according to the present invention, the oil hole formed in the clutch gear is the lubricating oil introduced into the gap between the clutch gear and the meshing portion between the input shaft and the counter shaft. Since it can be guided to the thrust bearing between the clutch gear and the clutch hub, the thrust bearing can be kept in a lubricated state. Moreover, since the clutch gear has a simple structure in which an oil hole is formed therethrough, it is possible to provide a lubricating structure for a gear type transmission that can prevent early wear of the thrust bearing at low cost.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part of a gear type transmission showing an embodiment of the present invention. 3: Input shaft 4: Output shaft 6: Counter shaft 12: Synchronous device 13: Clutch hub 17: Input shaft side clutch gear 21: Thrust bearing 22: Oil hole

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Claims (1)

[Scope of utility model registration request] 1. An input shaft, an output shaft arranged coaxially with the input shaft in series and rotatably supported at an end of the input shaft, and arranged in parallel with the input shaft and the output shaft. And a plurality of synchronizers for connecting the output shaft to the input shaft and the counter shaft, and a synchronizer for connecting the output shaft to the input shaft. Is a gear type transmission having a thrust bearing interposed between an input shaft side clutch gear integrally provided on the input shaft and a clutch hub fixed to the output shaft. An oil hole is formed in the gear for guiding the lubricating oil, which is guided into the gap between the meshing portion of the input shaft and the counter shaft and the clutch gear on the input shaft side, to the thrust bearing. Lubrication structure of transmission