JPH0444930Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speed change gear for a gear transmission for a vehicle.

[Prior Art] As shown in FIG. 3, a gear transmission for a vehicle equipped with a general dog clutch mechanism has a main shaft or output shaft 6 and an intermediate shaft 7 on the wall of a gear box 2. The intermediate shaft 7 is supported by a bearing 12 and a bearing 9, respectively.
A first speed change gear 10 and a second speed change gear 19, which are always in mesh with a series of gears 8 and 11 formed integrally with each other, are rotatably supported on the output shaft 6 by bearings 31 and 33. Further, a reverse speed gear R is supported by the output shaft 6 by a bearing 32 adjacent to the gear 10, and the gear R is always meshed with the gear 8 via an idle gear (not shown).

A clutch mechanism 18 is provided between the transmission gear 10 and the transmission gear R, and when one of the transmission gears 10 and R is selectively rotationally connected to the output shaft 6 by the clutch mechanism 18, the rotation of the engine (not shown) is stopped. It is transmitted to the intermediate shaft 7 via a mechanism, through an input shaft disposed on the same axis as the output shaft 6, a gear supported on the input shaft, and a gear on the intermediate shaft 7 that meshes with the gear.
The signal is transmitted from the gear 8 of the intermediate shaft 7 to the wheels via the speed change gear 10 or R and the output shaft 6.

In the clutch mechanism 18, a clutch sleeve 16 is spline-fitted to a clutch hub 35 that is spline-fitted to the output shaft 6, and when the clutch sleeve 16 moves to the right, it meshes with a spline 10a integrated with the speed change gear 10, and outputs the speed change gear 10. When the clutch sleeve 16 is rotatably connected to the shaft 6, and conversely moves to the left, it meshes with a spline r integral with the speed change gear R, thereby rotationally connecting the speed change gear R to the output shaft 6.

A bifurcated shift lever 13 that engages with an annular groove provided on the outer peripheral surface of the clutch sleeve 16 is fixedly supported by the shift rod 3. The shift rod 3 is a code land box 4 that closes the upper part of the gear box 2.
The axial movement of the shift rod 3 actuates the clutch sleeve 16 and accomplishes a gear shifting operation.

Another clutch mechanism is disposed between the second gear gear 19 and the third gear gear (not shown) and is actuated by a shift lever supported on another shift rod.

The gear transmission as described above includes a bearing 3 that rotatably supports the speed change gears 10, R, and 19 on the output shaft 6.
In order to prevent the gears 1 to 33 from seizing, an oil hole 14 is provided in each transmission gear 10, R, 19, extending diagonally from one end surface to the bearing part, and the gears 8, 11 of the intermediate shaft 7, etc. are inserted into the oil hole 14. The lubricating oil splashed up from the bottom of the gear box is supplied. However, when the viscosity of the lubricating oil is high at the start of operation, especially in cold weather, it is splashed up by the gears 8, 11, etc., and the amount of oil supplied from the oil hole 14 to the bearings 31 to 33 becomes insufficient. When the temperature of the lubricating oil increases and the viscosity decreases, even if the lubricating oil scraped up by the gears on the intermediate shaft 7 reaches the end faces of the speed change gears 10, R, and 19 during high-speed operation of the engine, it will not reach the speed change gears. When the rotational speed is high, the centrifugal force acting on the lubricating oil is large, and the lubricating oil is prevented from flowing into the bearing portion from the oil hole 14. In addition, the synchronized mesh clutch mechanism approaches the end face of each speed change gear,
Or, since it covers the transmission gear, the amount of oil that splashes up from the bottom of the gear box and flows between the two is limited.

In the gear lubrication device for a transmission disclosed in Japanese Utility Model Application Publication No. 59-155357, a radial rib is formed in the concave part of the end face of the gear, and the concave part is continuous with the front side surface of the rib in the rotational direction. A radial oil groove is provided to communicate between the bearing and the bearing. In the above-mentioned gear, both the ribs and oil grooves extend in the radial direction, so as the gear rotates, the lubricating oil that flows relatively counter-rotationally along the concave portion is blocked by the side surfaces of the rib. , since it is not urged toward the bearing and simply flows into the oil groove by its own weight, the lubrication efficiency is low.The higher the rotation speed of the gear, the greater the centrifugal force acting on the lubricating oil, reducing the lubrication efficiency. .

[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to prevent the lubricating oil attached to the end face of the transmission gear from moving around a part of the circumferential direction against centrifugal force as the transmission gear rotates. To provide a speed change gear of a gear transmission which is gathered together and is effectively scraped into an oil groove communicating with a bearing part.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the present invention is such that a gap is provided in the circumferential direction on the end surface of the boss portion of the transmission gear,
A plurality of oil grooves are provided that are inclined in the rotational direction of the transmission gear with respect to a radial line passing through the axis, and each oil groove approaches the rear in the rotational direction of the transmission gear on the end face of the transmission gear, and each oil groove runs from the boss part to the rim part. This is an integrally formed rib that extends parallel to the oil groove.

[Operation] The lubricating oil adhering to the end face of the speed change gear is pushed in the axial direction against centrifugal force by the rib on the end face inclined in the direction of rotation, and flows into the oil groove close to the rib. Since the oil groove is also inclined towards the direction of rotation,
The lubricating oil in the oil groove is pushed by the flow blocked by the ribs and is sent to the bearing against centrifugal force, increasing the amount of oil.

[Embodiment of the invention] An embodiment of the invention will be described using a transmission gear 19 as a representative example. As shown in FIG. 1, the speed change gear 19 is generally provided with an annular groove 27 on both end surfaces in order to thin the wall between the rim portion with the teeth 26 and the boss portion 28 with the shaft hole 30. The width (axial dimension) of the boss portion 28 is increased. Speed change gear 1
A plurality of inclined oil holes 14 are provided at equal intervals in the circumferential direction, extending from the end face of the shaft hole 30, that is, the groove 27, to the axial center of the shaft hole 30.

As shown in FIG. 2, according to the present invention, four oil grooves 29 are provided on the end face of the boss portion 28 at equal intervals in the circumferential direction, the oil grooves 29 being inclined with respect to the radial line y passing through the axis. A rib 34 is provided along the oil groove 29 so as to fill the end face of the speed change gear 19, that is, the groove 27.
The rib 34 is also inclined, preferably in the direction of rotation of the transmission gear 19 as indicated by the arrow x with respect to the y-line passing through the axis. The appropriate inclination angle of the ribs 34 is about 30°.

Next, the operation of the speed change gear of the gear transmission according to the present invention will be explained. The speed change gear 19 meshes with the gear 11 of the intermediate shaft 7 and is constantly rotated in the direction of arrow x. Therefore, the lubricating oil scraped up from the bottom of the gear box by the gear 11 of the intermediate shaft 7 falls directly or hits the wall of the Cordland box 4, and is deposited on the transmission gear 19 and the adjacent transmission gear R. It adheres to the end surface of the transmission gear 19 through the gap, that is, the end surface represented by the groove 27. The lubricating oil adhering to the groove 27 is subjected to centrifugal force, flows along the groove 27 in a direction opposite to the rotational direction x, is blocked by the rib 34, and flows into the oil groove 29. In this way, oil groove 2
The amount of oil flowing into the shaft hole 9 is increased compared to the conventional example, and lubricates the bearing 33 supported between the shaft hole 30 and the output shaft 6.

Although the case of the speed change gear 19 has been described above, lubricating oil can be effectively sent to the bearing portion by configuring the other speed change gears R, 10, etc. in the same manner.

[Effects of the invention] As described above, the ribs and oil grooves of the gear both have an inclination in the direction of rotation. It is dammed up by ribs, and the ribs, which are tilted in the direction of rotation, push it toward the oil groove against centrifugal force. The lubricating oil that has reached the oil groove is urged toward the bearing against centrifugal force by the oil groove that is inclined in the direction of rotation.

Since the lubricating oil is directed to the bearing by the two-stage biasing force of the ribs and the oil groove, the oil supply efficiency is high and the lubrication effect of the bearing portion is greatly improved.

The higher the rotational speed of the transmission gear, the greater the ability of the ribs and oil grooves to gather lubricating oil radially inward.

[Brief explanation of the drawing]

Fig. 1 is a left side cross-sectional view of a gear change gear of a gear transmission according to the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a side cross-sectional view showing the main parts of a general gear transmission for a vehicle. . 6...Output shaft, 7...Intermediate shaft, R, 10, 19
...Speed gear, 18...Clutch mechanism, 27...
Groove, 28...Boss portion, 29...Oil groove, 31-33
... bearing, 34 ... rib.

Claims (1)

[Scope of utility model registration request] A plurality of oil grooves are provided at intervals in the circumferential direction on the end face of the boss portion of the speed change gear and are inclined toward the rotational direction of the speed change gear with respect to a radial line passing through the axis. A speed change gear for a gear transmission, characterized in that a rib is integrally formed that approaches the rear of the groove in the direction of rotation and extends parallel to each oil groove from a boss portion to a rim portion.