JP2573614Y2 - Lubrication structure inside transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication structure for a transmission, and more particularly to a lubrication structure for a bearing disposed in a drive pinion supporting a main shaft.

[0002]

2. Description of the Related Art A main shaft and a counter shaft for transmitting a driving force from an engine are arranged in a transmission case. Both of these shafts are supported at their input and output sides by bearings. The input end of the main shaft is supported via a pilot bearing inside a drive pinion supported by a bearing held between a transmission case and a clutch housing located on the input side.

[0003]

In such a structure, in order to supply the lubricating oil to the above-described pilot bearing, an oil passage is formed in the drive pinion, and the lubricating oil stored in the lower portion of the transmission is changed in the transmission inside the transmission. It is jumped up by the rotation of the gear and guided to the oil path. However, lubricating oil (splashed oil) jumped up and led to the oil passage
Out problem is not the drive pin <br/> anion internal feed through the oil passage as expected by the centrifugal force generated by rotation of the drive pinion and the main shaft, the durability will occur is insufficient lubrication to the pilot bearing Would.

[0004]

Therefore, in the present invention, a step is connected to a step portion which is supported by a bearing held between the housing located on the input side end plate of the transmission case and the transmission case. A drive pinion having an oil passage formed therein, and a lubrication structure inside the transmission having a main shaft supported via a pilot bearing with its tip located in the stepped portion, wherein the lubrication structure is formed with respect to the center of the main shaft. The tip or the step is provided eccentrically, and the tip is provided with a variable wing so as to always contact the inner peripheral surface of the step, and the pump that rotates in synchronization with the main shaft or the drive pinion is driven by the drive. It was formed between the inside of the pin-on and the main shaft.

[0005]

[Function] Between the drive pinion and the main shaft, a step portion provided on the tip of the main shaft or the drive pinion is provided eccentrically with respect to the center of the main shaft, and is variable so as to always contact the inner peripheral surface of the step portion. The wing is provided at the tip to form a pump that rotates in synchronization with the main shaft or the drive pinion, so the inside of the step portion of the drive pinion is made negative pressure, and the splash oil splashed up by the transmission gear is centrifuged. In contrast, the oil is supplied from the oil passage into the drive pinion.

[0006]

BRIEF DESCRIPTION real施例of the present invention. In FIG. 1, reference numeral 1 denotes a transmission case (hereinafter, referred to as a transmission case).
The T / M case 1 includes a clutch housing 2 on a left end plate 1a on the input side and a right end on the output side (not shown). The extension housings are respectively joined to the plates. In the T / M case 1, a main shaft 5 provided with a drive pinion 3 and a speed change gear 4 connected to a clutch for disconnecting an output from an engine (not shown), and a counter shaft 6 parallel to the main shaft 5 Are arranged respectively.

[0007] The counter shaft 6 is a T / M case 1
In addition to being rotatably supported by a pair of bearings 7 provided on both end plates (only the left end plate 1a is shown), T / M
Approximately 1/3 of the lubricating oil G stored in the lower part of the case 1 is immersed.

[0008] The output side end (not shown) of the main shaft 5 (the right side) is <br/> supported counter shaft 6 similarly bearings. The input end 5a of the main shaft 5 is
Bearing 7 ′ provided on end plate 1 a of T / M case 1
Is engaged with the drive pinion 3 supported by the drive pinion.

As shown in FIG. 3, a step hole 8 serving as a shaft engaging portion is formed in the inner end surface of the drive pinion 3. The step hole 8 includes a large-diameter portion 8a and a small-diameter portion 8b. The large-diameter portion 8a has a pilot bearing 9 attached to the input end 5a with a snap ring 10.
Are fitted, and the distal end portion 50 of the input side end 5a is fitted to the small diameter portion 8b.

The pilot bearing 9 is arranged on the same center line a as the main shaft 5 and the drive pinion 3, and rotatably supports the main shaft 5 with an output-side bearing (not shown).

The drive pinion 3 has an oil passage 11 communicating with the small diameter portion 8b from the end face 1a on the input side to the small diameter portion 8b.
It is formed obliquely toward b.

As shown in FIG. 2, the tip portion 50 located in the small diameter portion 8b has its center point O 'eccentric with respect to the center point O of the main shaft 5 by an interval L, and is cut off. A plurality of variable blades 12 are arranged on the circumferential surface 50a of the tip portion 50 so as to be slidable in the radial direction. That is, the vane pump P is formed inside the drive pinion 3 with the small diameter portion 8b as the outer case and the variable blade 12 as the vane.

[0013] With this configuration, via the clutch driving force from the engine becomes a crankshaft rotation dry
Once transmitted to the blanking pinion 3, the main shaft 5 and the counter shaft 6 is rotated by a combination of speed change gear,
The transmission is transmitted to the drive wheels while being controlled to an appropriate number of revolutions corresponding to the speed change state.

At this time, the counter shaft 6 shown in FIG.
The lubricating oil G is splashed up to the entire inside of the T / M case 1 by the transmission gears disposed in the T / M case 1 to become splashed oil, and a part thereof is also splashed up near the roller bearing 7 'near the input side end face 1a. Then, the tip 50 of the main shaft 5
The variable wing 12 provided in the main shaft 5 rotates in the same direction as the main shaft 5 while sliding in the radial direction within the small diameter portion 8b corresponding to the pump outer case . This allows the tip of the variable wing 12
Since the end rotates with the small diameter portion 8b constantly in contact with the small diameter portion 8b, the inside of the small diameter portion 8b is made negative pressure, and the splash oil near the roller bearing 7 'resists the centrifugal force generated by the rotation of the main shaft 5 and the drive pinion 3. To lubricate the pilot bearing 9 by sucking it into the oil passage 11 and introducing it into the small diameter portion 8b.

In this embodiment, the distal end portion 50 of the main shaft 5 is formed eccentric with respect to the shaft. However, the distal end portion 50 is made concentric with the shaft, and the small diameter portion 8b is replaced with the main shaft 5. The same pumping effect can be obtained by forming the eccentricity with respect to the center line a of the above.

[0016]

According to the present invention, a pilot bearing for supporting the main shaft is fitted and the oil passage is connected.
At the step of the live pinion and at the tip of the main shaft
Forming a pump with variable vane provided, since for sucking lubricating oil in the transmission case within the stepped portion of the drive pinion, that the shortage of lubricating oil to the pilot bearing to improve the durability of the eliminating said bearing it can.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view of a drive system embodying the present invention.

FIG. 2 is an enlarged sectional view of FIG. 1A-A.

FIG. 3 is a partially enlarged cross-sectional view of a drive pinion and a main shaft , which are main parts of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmission case 1a Input end plate 3 Drive pinion 5 Main shaft 7, 7 'Bearing 8 Stepped portion 8b Small diameter portion (outer case) 9 Pilot bearing 11 Oil passage 12 Variable wing (vane) 50 Tip P pump

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/04 F04C 2/344 F04C 15/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A stepped portion which is supported by a bearing held between a housing located on an input side end plate of a transmission case and the transmission case, and has a stepped portion.
A drive pinion formed with an oil passage leading to this, and a lubrication structure inside the transmission having a main shaft which is located in the step and whose tip is positioned and supported via a pilot bearing. And the tip or upper part with respect to the center of the main shaft.
The step is provided eccentrically, and the tip is
A transmission characterized in that a variable blade is provided so as to always contact the peripheral surface to form a pump that rotates in synchronization with the main shaft or the drive pinion, and lubricating oil in the transmission is introduced into the drive pinion. Internal lubrication structure.