JPH0540331Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synchronous meshing device for a transmission in which a double cone is arranged between an inner cone and an outer cone.

[Prior Art] A transmission equipped with a synchronous meshing device (the transmission referred to in this application is not limited to an automobile transmission, but has a broad concept that includes, for example, a two-wheel/four-wheel drive switching device, etc.) It is well known and has traditionally been used as a synchronized meshing device as an integral part of the output gear, which is loosely fitted onto the output shaft (which may also be the input shaft) and which is constantly driven to rotate by the input gear fixed to the input shaft. a synchronizer ring that is spline-engaged with the output shaft and further spline-engaged with the hub sleeve that is spline-engaged with the clutch hub that constantly rotates together with the output shaft; A synchronizer key is provided that moves in the same direction as the hub sleeve slides toward the output gear during shift switching, and the synchronizer key presses the synchronizer ring against the cone portion when the hub sleeve slides toward the output gear and toward the output shaft. The synchronizer ring and the cone are frictionally engaged, thereby causing the output gear and the hub sleeve to rotate synchronously prior to their meshing.

However, in this conventional type, it is not possible to increase the area of the frictional engagement surface between the synchronizer ring and the cone part with a compact structure, so the frictional force acting on the frictional engagement surface is relatively small, and the frictional force acting on the frictional engagement surface is relatively small. There was a problem where the operating force had to be increased.

Therefore, for example, as shown in FIG. 4, a clutch hub 42 spline-engaged with the output shaft 41,
Similarly, an inner cone 43 having a tapered outer peripheral surface that is spline-engaged with the output shaft 41 and rotates together with the clutch hub 42; a hub sleeve 44 that is spline-engaged with the clutch hub 42; It is constructed around an outer cone 45 having a tapered inner circumferential surface facing the outer circumferential surface of the inner cone 43 and a double cone 47 that rotates together with an output gear 46 disposed in a space between the inner cone 43 and the outer cone 45. Ru. Transmissions with synchronizers have been proposed (see, for example, US Pat. No. 3,272,291).

In this conventional synchronizer, prior to the hub sleeve 44 and the output gear 46 meshing,
The inner cone 43 and the outer cone 45 are frictionally engaged with the double cone 47 from inside and outside surfaces, respectively, so that the hub sleeve 44 and the output gear 46 rotate synchronously, and the frictional engagement area is reduced. This is about twice as much as a normal synchronizer, so it is possible to ensure sufficient frictional force and reduce the operating force required for shifting.

However, in such a synchronizer, the double cone coupled to the output gear corresponding to the gear position not selected releases the frictional engagement with the corresponding inner cone and outer cone, and
However, since the distance between the double cone and the inner cone or the distance between the double cone and the outer cone is very small, even when the frictional engagement is released, the double cone and the inner cone Since some frictional force acts on the facing surface between the double cone and the outer cone (hereinafter referred to as the inner facing surface) or the facing surface between the double cone and the outer cone (hereinafter referred to as the outer facing surface), these The opposing surfaces are lubricated.

However, since the clearance between the inner facing surface and the outer facing surface is very narrow, lubricating oil is not sufficiently supplied to these facing surfaces, and furthermore, the double cone, inner cone, and outer cone rotate around their respective output shafts. Therefore, the lubricating oil supplied to the inner facing surface and the outer facing surface flows outward in the radial direction of the output shaft due to centrifugal force, causing problems such as deterioration of the lubrication of these facing surfaces. There was a problem in that the lubrication between the inner facing surfaces between the double cone and the inner cone deteriorated, resulting in a decrease in the durability of the double cone or inner cone.

[Purpose of the invention] The present invention has been made in consideration of the above-mentioned problems in the conventional technology, and has as its object to provide a synchromesh device for a transmission which promotes lubrication when the frictional engagement between the opposing surfaces of the double cone and the inner cone is released in a transmission equipped with a synchromesh device, thereby improving the durability of the double cone and the inner cone.

[Structure of the invention] In order to achieve the above object, the present invention includes an inner cone having a tapered outer peripheral surface that rotates together with a clutch hub that engages with the rotating shaft through splines, and a hub sleeve that rotates with the clutch hub that engages with the clutch hub from the outside through splines. and an outer cone having an inner circumferential surface facing the outer circumferential surface of the inner cone, and a double cone that rotates together with a gear loosely fitted on the rotating shaft is disposed between the inner cone and the outer cone. Provided is a synchronized meshing device for a transmission, characterized in that the transmission is equipped with a spring member that biases a double cone in a direction away from an inner cone.

[Effect of the invention] Generally, in a synchronizing device, when the double cone is not in synchronized mesh with the inner cone and the outer cone, a predetermined interval is provided between the double cone and the outer cone and between the double cone and the inner cone. However, according to the present invention, since the double cone is always urged in the direction away from the inner cone by the spring member, the double cone is moved toward the outer cone side, and the double cone and the outer cone are separated from each other. The clearance between the double cone and the inner cone increases accordingly, and lubricating oil can easily enter the clearance between the double cone and the inner cone.
Therefore, the lubricating oil, which is constantly flowing outward in the radial direction of the rotating shaft from the center side of the rotating shaft, flows into the clearance defined between the inner circumferential surface of the double cone and the outer circumferential surface of the inner cone. The facing surfaces between the inner cone and the inner cone are sufficiently lubricated, and the durability of the inner cone can be improved.

In addition, since the inner circumferential surface of the double cone and the outer circumferential surface of the inner cone are sufficiently lubricated, when the inner circumferential surface of the double cone begins to frictionally engage with the outer circumferential surface of the inner cone at the start of synchronous meshing, the engagement will be moderate. Since it is loosened and impactful engagement is prevented, it is possible to prevent shock from occurring during shift switching.

[Example] The embodiments of the present invention will now be described in detail.

Figure 1 shows the first and second gears of a transmission equipped with a synchronizer.
FIG. 3 is a cross-sectional view of the area around the fast switching clutch hub.
The right side of Figure 1 is the 1st speed side, and the left side is the 2nd speed side.
Regarding the speed side, since the first speed side and the second speed side are constructed of the same members, only the first speed side will be explained below.

As shown in FIG. 1, the synchronous meshing device G is loosely fitted to the output shaft 1, and meshes with a 1st speed input gear (not shown) attached to the input shaft (not shown) to provide constant input. The rotational force of the first speed output gear 2 (hereinafter simply referred to as the output gear) rotating with the shaft is transferred to the hub sleeve 3 and the clutch hub 4 which is spline-fitted to the output shaft 1 and constantly rotates together with the output shaft 1. The basic configuration is such that the signal is transmitted to the output shaft 1 via. The output gear 2 has
A gear spline 5 and a hub portion 6 are formed integrally with this, and an inner cone 7 is loosely fitted into the hub portion 6. This inner cone 7 is formed in a substantially annular shape and is arranged coaxially with the output gear 2 on the hub portion 6 . The outer peripheral surface of the inner cone 7 is formed into a tapered shape that gradually becomes smaller in diameter toward the clutch hub 4 side, and several keys 8 are formed at the tip of the inner cone 7 at intervals. The key 8 is engaged between a plurality of protrusions 9 on the clutch hub 4. Here, protrusion 9
The length in the circumferential direction between the two is set to be longer than the width of the key 8, so that the inner cone 7 can rotate relative to the clutch hub 4 by a predetermined amount.

A hub sleeve 3 is splined to the outer peripheral surface of the clutch hub 4. Therefore, the hub sleeve 3 always rotates together with the clutch hub 4, and is also able to slide relative to the clutch hub 4 in the direction of the output shaft. The clutch hub 4 also holds a plurality of synchronizer keys 11. The synchronizer key 11 is engaged with the hub sleeve 3, and is adapted to move together with the hub sleeve 3 when it slides in the direction of the output shaft.

Furthermore, an outer cone 13 is disposed between the gear spline 5 and the clutch hub 4. The outer cone 13 has a tapered inner circumferential surface facing the outer circumferential surface of the inner cone 7, and a spline is formed on the outer circumferential surface. When the synchronizer key 11 moves in the direction of the output shaft, it is pressed in the direction of the output gear 2 by the synchronizer key 11.

A double cone 15 having both sides tapered is disposed between the inner circumferential surface of the outer cone 13 and the outer circumferential surface of the inner cone 7. Several keys are formed at the end of the double cone 15 on the output gear 2 side, and these keys are engaged with the gear spline 5, whereby the double cone 15 is connected to the gear spline 5, that is, the output gear 2 and can move in the direction of the output shaft to some extent. Furthermore, an outer lining 16 and an inner lining 17 are provided on the outer circumferential surface and inner circumferential surface of the double cone 15, respectively, to increase the coefficient of friction.

Then, when a shift fork (not shown) is operated to slide the hub sleeve 3 toward the output gear 2, the hub sleeve 3 first engages the outer cone 13 with a spline, and at the same time, the synchronizer key 11 engages the outer cone 13 with a spline. Since it is pushed toward the output gear 2 side, the inner circumferential surface of the outer cone 13 is pressed against the double cone 15 and frictionally engages with the double cone 15 via the outer lining 16, and furthermore, the double cone 15 is also pushed toward the output gear 2 side. It is pressed against the outer peripheral surface of the inner cone 7 and frictionally engages with the inner cone 7 via the inner lining 17. On the other hand, since the double cone 15 rotates together with the output gear 2, the output gear 2 and the hub sleeve 3, ie, the clutch hub 4, rotate synchronously due to the above-described frictional engagement. Therefore, when the hub sleeve 3 further slides toward the output gear 2, the hub sleeve 3 smoothly engages with the gear spline 5, and the output gear 2 and the output shaft 1 are firmly connected, and the output gear 2 Rotational force is transmitted to the output shaft 1.

By the way, between the end face of the annular collar portion 15a at the end of the double cone 15 on the output gear 2 side, which is perpendicular to the output shaft 1 on the output gear 2 side, and the end face of the gear spline 5 on the clutch hub 4 side, there is an annular thin plate shape. A wave spring type spring member 21 is clamped.

As shown in FIG. 3, this spring member 21
Six protrusions 22 are provided on the outer periphery of the holder 22 so as to protrude outward in the radial direction at equal intervals in the circumferential direction. These six protrusions 22 are connected to six fitting parts 24 formed on the end face of the gear spline 5 on the clutch hub 4 side at positions where they engage with the protrusions 22, as shown in FIG. It is fitted and fixed in position.

The spring member 21 always urges the double cone 15 toward the clutch hub 4 side.
Therefore, the inner circumferential surface of the double cone 15 is biased in a direction away from the outer circumferential surface of the inner cone 7.

For this reason, the double cone 15 is connected to the inner cone 7.
When the double cone 15 is not in synchronous mesh with the outer cone 13, the double cone 15 is displaced to the outer cone 13 side within the clearance between the double cone 15 and the outer cone 13, and the double cone 15 and the inner cone 7 are displaced by that amount. The clearance between the double cone 15 and the inner cone 7 increases, making it easier for lubricating oil to enter the clearance between the double cone 15 and the inner cone 7. Therefore, the lubricating oil that is constantly flowing outward in the radial direction of the output shaft from the center side of the output shaft 1 flows into the clearance defined between the inner peripheral surface of the double cone 15 and the outer peripheral surface of the inner cone 7. As the flow flows in, the facing surfaces between the double cone and the 15 inner cone 7 are sufficiently lubricated, and the inner cone 7
The durability of the material can be improved.

Further, as explained in the effect of the present invention, since the inner circumferential surface of the double cone 15 and the outer circumferential surface of the inner cone 7 are sufficiently lubricated, the inner circumferential surface of the double cone 15 and the outer circumferential surface of the inner cone 7 are
It is possible to prevent the occurrence of shock when frictional engagement begins to occur on the outer peripheral surface.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of a main part of a transmission equipped with a synchronized meshing device according to the present invention. FIG. 2 is a view showing the end surface of the gear spline on the clutch hub side, in which a fitting portion into which the protruding portion of the spring member is fitted is formed. FIG. 3 is a front explanatory view of the spring member. FIG. 4 is an explanatory cross-sectional view of a main part of a transmission equipped with a conventional synchronizing mesh device. 1... Output shaft (rotating shaft), 2... Output gear (gear), 3... Hub sleeve, 4... Clutch hub,
7... Inner cone, 13... Outer cone, 1
5...Double cone, 21...Spring member.

Claims (1)

[Claims for Utility Model Registration] An inner cone having a tapered outer circumferential surface that rotates together with a clutch hub that is spline-engaged with the rotating shaft; and an inner cone that rotates together with a hub sleeve that is spline-engaged with the clutch hub from the outside; A transmission comprising an outer cone having an outer circumferential surface and an opposing inner circumferential surface, and a synchronous meshing device in which a double cone that rotates together with a gear loosely fitted on the rotating shaft is arranged between the inner cone and the outer cone. A synchronous meshing device for a transmission, characterized in that a spring member is provided that biases the double cone in a direction away from the inner cone.