JPH0495642A - Transmission - Google Patents

Abstract

PURPOSE:To make a lubricating operation effective, and to prevent the seizure of a sliding surface at the time of high speed revolution by forming a protruded part for blocking a lubricating oil stagnant at the position of a notch part, on the web of at least a part of gear of a main gear. CONSTITUTION:A space (a) for accumulating and reserving a lubricating oil splashed in a box, is formed between a dog gear 2 and a main gear 1, and a notch part 2a, which is communicated to the space, and which has the lubricating oil flown out toward a synchronous mechanism 3, is provided on the dog gear 2, while a recessed part 4 for blocking the lubricating oil which is stagnant at the position of the notch part 2a, is provided on the web of the main gear 1, on the rear side of the direction. When the lubricating oil is splashed up by the rotation of a reverse idler gear 5, the lubricating oil intrudes into the space (a), and the lubricating oil is blocked by the protruded part 4, and is supplied in quantity from the notch part 2a, to both inner and outer surfaces of a double cone 7 of the synchronous mechanism 3, and to the surface on which an outer ring 6 and an inner cone 8 are slid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission for transmitting engine power of an automobile. In particular, the present invention relates to improvements in lubricating the synchronization mechanism of transmissions used in large vehicles.

〔overview〕

The lubricating oil is splashed up by the reverse idler gear and scattered inside the box, and the scattered lubricating oil is collected and temporarily retained in the space between the main gear and the dog gear, and the synchronous mechanism is supplied with oil from the notch in the dog gear. In a transmission, by forming a protrusion that dams up the lubricating oil that has accumulated on the web of the main gear at the location of the notch, the lubricating oil flowing out from the notch can be efficiently supplied to the synchronization mechanism. It is something.

[Conventional technology]

A structure in which lubricating oil is held inside the transmission box at a depth that partially immerses the reverse idler gear, and as the gear rotates, the oil is splashed up and scattered, and the main gear and synchronization mechanism are lubricated. It has been known. Furthermore, transmissions for large automobiles have a structure in which the lubricating oil splashed between the main gear and the dog gear is temporarily retained, and this retained lubricating oil is supplied to the synchronization mechanism through a notch provided in the dog gear. It has been developed.

[Problem to be solved by the invention]

Although this structure is an excellent structure for efficiently supplying oil to the synchronization mechanism, there may still be insufficient supply of oil if high-speed rotation is suddenly performed without the temperature rising sufficiently.

The present invention aims to improve this and to supply lubricating oil to the synchronization mechanism of the above structure more efficiently.

[Means for Solving the Problems] The present invention includes a main gear, a dog gear that rotates integrally with the main gear, and a synchronization mechanism adjacent to the dog gear, and the lubricating oil scattered inside the box is accumulated and temporarily removed. A transmission having a structure in which a space in which lubricating oil remains is formed between the dog gear and the main gear, and a notch is provided in the dog gear to communicate with the space and drain the lubricating oil that remains towards the synchronization mechanism. In this invention, at least some of the gears of the main gear are characterized in that a convex portion is formed on the web of the gear at the position of the notch portion to dam the lubricating oil that remains.

The convex portion is provided on the rear side of the notch in the rotational direction, and the tooth width of the reverse idler gear located below the main gear is expanded to just below the synchronization mechanism. This is desirable.

[Effect]

The lubricating oil splashed up by the reverse idler gear scatters inside the transmission box, and this scattered lubricating oil accumulates and temporarily remains in the space between the main gear and the dog gear, which has cutouts at multiple locations on the outer periphery. do. This retained lubricating oil is dammed up by a convex part of the main gear formed corresponding to the position of the notch of the dog gear, and from the notch of the dog gear to both the inner and outer surfaces of the double cone of the synchronization mechanism, the outer ring, and the inner cone. Supply a large amount of lubricating oil to the sliding surfaces.

Thereby, lubricating oil is efficiently supplied to the synchronization mechanism, and it is possible to prevent seizure of the sliding surface, which tends to occur during high-speed rotation.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a partially sectional perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a partially sectional view showing the structure of an embodiment of the present invention, and FIG.
Figure a) is a plan view showing the relationship between the attachment of the main gear and the dog gear according to the embodiment of the present invention, and figure 3) is a sectional view taken along the line A-A shown in figure (a).

The embodiment of the present invention includes a main gear 1, a dog gear 2 that rotates integrally with the main gear 1, and a synchronization mechanism 3 adjacent to the dog gear, and the lubricating oil scattered inside the box is accumulated and temporarily retained. A space a is formed between the dog gear 2 and the main gear 1, and a notch 2 communicates with the space a and allows lubricating oil staying there to flow out toward the synchronization mechanism 3.
A is provided on this dog gear 2, and as a feature of the present invention, a convex portion 4 is formed on the web of the main gear 1 to dam the lubricating oil that remains at the position of the notch portion 2a.

This convex portion 4 is provided on the rear side in the rotational direction with respect to the notch portion 2a.

Furthermore, the face width t of the reverse idler gear 5 located below the main gear 1 is expanded to the face width T to the position immediately below the synchronization mechanism.

Next, the operation of the embodiment of the present invention configured as described above will be explained.

When the lubricating oil held within the transmission surface is splashed up by the rotation of the reverse idler gear 5, the lubricating oil infiltrates into the space a between the main gear 1 and the dog gear 2, and this infiltrated lubricating oil is transferred to the web of the main gear 1. The outer ring 6 and the inner cone 8 slide on both the inner and outer surfaces of the double cone 7 of the synchronization mechanism 3 through the notch 2a provided in the dog gear 2 by blocking the convex portion 4 provided on the dog gear 2 and preventing it from flowing out. A large amount is supplied to the surface.

On the other hand, the reverse idler gear 5 is as shown in FIG.
In order to splash the lubricating oil inside the case with the tooth width T, which is expanded from the conventional tooth width t to just below the synchronization mechanism 3, more lubricating oil is added to the space a between the main gear 1 and the dog gear 2. is supplied.

〔Effect of the invention〕

As explained above, according to the present invention, the tooth width of the reverse idler gear is expanded to increase the amount of lubricating oil splashed up,
Furthermore, by damming the splashed up lubricating oil to prevent it from flowing out and supplying a large amount of lubricating oil to the synchronization mechanism, the lubricating operation can be performed efficiently, and the sliding that is likely to occur during high-speed rotation can be avoided. This has the effect of preventing surface burn-in.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view showing the configuration of an embodiment of the present invention. FIG. 2 is a partial sectional view showing the configuration of an embodiment of the present invention. FIG. 3(a) is a plan view showing the attachment relationship of the main gear and dog gear according to the embodiment of the present invention. FIG. 3(b) is a sectional view taken along line A in FIG. 3(a), showing the relationship between the attachment of the main gear and dog gear according to the embodiment of the present invention. 1...Main gear, 2...Dog gear, 2a...
Notch portion, 3... Synchronization mechanism, 4... Convex portion, 5...
・Reverse idler gear, 6... Outer ring, 7
...Double cone, a...Empty L8...Inner cone. Patent Applicant: Hino Motors Co., Ltd. Agent, Patent Attorney: Nao Ide, F#4 Organization] Figure 1, Contract;

Claims (1)

[Claims] 1. A space comprising a main gear, a dog gear that rotates integrally with the main gear, and a synchronization mechanism adjacent to the dog gear, in which the lubricating oil scattered in the box is collected and temporarily retained. is formed between the dog gear and the main gear, and the dog gear is provided with a notch that communicates with the space and drains lubricating oil that remains toward the synchronization mechanism. A transmission characterized in that, for at least some of the gears, a convex portion is formed on the web of the gear to dam the lubricating oil remaining at the position of the notch portion. 2. The transmission according to claim 1, wherein the convex portion is provided on the rear side of the notch in the rotational direction. 3. The transmission according to claim 1, wherein the tooth width of the reverse idler gear located below the main gear is expanded to directly below the synchronization mechanism.