KR100897092B1 - Needle ball bearing supporting structure of manual transmission - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle ball bearing support structure of a manual transmission, and in particular, a needle of a manual transmission capable of preventing gear eccentricity and eccentricity due to axial and radial thrusts at a part where friction occurs due to a difference in relative speed between parts. It relates to a ball bearing support structure.

Needle ball bearing support structure of the present invention is a hub, helix gear, the final gear is coupled around the output shaft, the needle roller bearing is installed between the output shaft and the helix gear, a part of the bottom surface of the helix gear is inclined surface It is formed, and characterized in that the ball bearing is mounted so that the three-point contact with the adjacent parts in the lower surface and the side portion, including the inclined surface.

Description

Needle ball bearing support structure of manual transmission {NEEDLE BALL BEARING SUPPORTING STRUCTURE OF MANUAL TRANSMISSION}

The present invention relates to a needle ball bearing support structure of a manual transmission, and more particularly, in a gear coupling structure connected to an output shaft of a manual transmission, having a ball bearing assembly connected to a needle roller bearing and making three-point contact between adjacent mating parts. It is possible to obtain axial and radial reaction forces on the inclined surface of the inner diameter, and this reaction force relates to a needle ball bearing support structure which prevents contact with the counterpart and prevents gears and eccentricity from occurring.

1A is a cross-sectional view showing an example of a conventional manual transmission structure, FIG. 1B is an enlarged view of portion A of FIG. 1A,

FIG. 2 is a cross-sectional view showing a axial thrust and a radial thrust generation direction and a position where the gear and the eccentricity are generated in the conventional manual transmission structure.

The enlarged portion (part A) of the conventional manual transmission structure is a portion where friction occurs due to a relative speed difference between components in the manual transmission. That is, the hub 11, the needle roller bearing 17, and the rear final gear 15 are connected to the output shaft 10 and the output shaft 10 is connected to the needle roller bearing 17. ) Is connected to the HELIX gear 13, in particular to improve the NVH performance of the gear.

In the conventional manual transmission gear structure described above, the thrust in the radial and axial directions (P1 and P2 in FIG. 2) is generated by the helix angle of the gear. That is, as shown in Fig. 2, although the gap between the parts is formed to prevent the friction between the gear counterparts, the gear push phenomenon occurs by the axial thrust P1, the pushed gear is the counterpart, that is, the hub (11) or the final gear 13, thereby generating friction heat.

In particular, during the R-speed shift in which the relative speed between parts is large, significant frictional heat is generated, and the plastic cage (not shown) constituting the case of the needle roller bearing 17 may melt, causing secondary breakage of other parts. (At the time of the R gear shift, the rotational direction of the gear rotating by the input shaft and the backward gear is reversed because the relative speed is the largest.)

In addition, there is a problem that the gear eccentricity is caused by the radial thrust P2.

The radial thrust P2 is eccentric by the distance between the inner diameter of the helix gear 13 and the needle roller bearing 17 so that the inner diameter of the helix gear 13 presses the needle roller bearing 17 at this portion. Friction (heat) occurs, and wear of parts occurs at the friction sites. If the gear eccentric continues to grow, NVH deterioration and secondary breakage will occur.

At point B in FIG. 2, gear eccentricity occurs due to radial thrust P2, which causes friction between the needle roller bearing 17 and the adjacent gear parts. Point C is where the plastic cage of the needle roller bearing 17 melts, and point D is where the gear is pushed due to the axial thrust P1, thereby contacting the counterpart, lubrication problems and secondary damage. This will happen. In addition, the jaw portion 12 of the output shaft 10 may be damaged and the hub 11 may be pushed.

Therefore, the present invention is to solve the above-mentioned problems, the ball bearing assembly which is connected to the needle roller bearing in the place where the friction occurs due to the difference in the relative speed between the gear parts adjacent to the output shaft in the manual transmission is made three-point contact between the adjacent parts An object of the present invention is to provide a needle ball bearing support structure of a manual transmission in which a gear and an eccentricity of a gear are prevented by axial and radial thrust.

Needle ball bearing support structure of the manual transmission of the present invention for achieving the above object is the hub 31, the helix gear 33, the final gear 35 is coupled around the manual transmission output shaft 30, the output shaft A needle roller bearing 37 is installed between the 30 and the helix gear 33, and a part of the bottom surface of the helix gear 33 is formed as the inclined surface 33a, and the adjacent parts including the inclined surface 33a. And a ball bearing assembly 60 equipped with a ball bearing such that three-point contact is simultaneously made at the lower surface and the side surface. The ball bearing assembly 60 includes a bearing retainer 40 having a plurality of bearing mounting holes 43; It includes a plurality of ball bearings 50 mounted to the bearing retainer 40, the bearing retainer 40 is a plurality of at regular intervals along the circumference of the circular body 41, the circular body 41 Formed bearing It is formed by a landing hole 43, the side end surface of the circular body 41 is formed in a shape having a triangular outer three sides (41a, 41b, 41c) around the axial direction and radius in the manual transmission The gear eccentricity and gear eccentricity due to the generation of directional thrust are characterized in that the phenomenon is not generated.

The ball bearing assembly 60 is preferably formed in a structure connected to the needle roller bearing 37.

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In addition, when the ball bearing 50 is mounted, the bearing mounting hole 43 of the bearing retainer 40 may expose a portion of the ball bearing 50 to the outside of the triangular outer three surfaces 41a, 41b, and 41c. It is desirable to make point contact at three points.

According to the needle ball bearing support structure of the present invention described above, axial and radial reaction forces can be obtained on the inclined surface of the gear inner diameter, and the reaction force prevents contact with the counterpart and prevents eccentricity as the thrust of the gear is applied. Exert.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the needle ball bearing support structure according to the present invention.

3a to 3d is a view showing a needle ball bearing support structure of a manual transmission according to the present invention,

Figure 3a is a cross-sectional view of a state in which the ball bearing assembly of the present invention is mounted between the output shaft and the gear of the manual transmission,

Figure 3b is a perspective view showing the configuration of a ball bearing assembly according to the present invention,

3C is a cross-sectional view taken along the line E-E of FIG. 3B.

Referring to the drawings together, in the present invention, the one end of the bottom part of the helix gear 33 connected by the output shaft 30 and the needle roller bearing 37 of the manual transmission is formed as the inclined surface 33a, and on the site Including the inclined surface (33a) is provided with a ball bearing 50 which makes three-point contact at the adjacent parts and bottom and side portions.

The ball bearing 50 is mounted to a bearing retainer (40 of Figure 3b), the bearing retainer 40 is a circular body 41 having a diameter of a predetermined size, as shown in Figure 3b, the body 41 It is made of a bearing mounting hole 43 formed at a predetermined interval along the circumference. At this time, the side cross-section of the circular body 41 is formed in a substantially triangular shape, the outer three sides (41a, 41b, 41c of Figure 3c) is formed around it.

When the ball bearing 50 is mounted on the bearing retainer 40, the ball bearing 50 is exposed to a portion outside the triangular outer three sides 41a, 41b, 41c, and after the ball bearing 50 is mounted, the bearing The bearing mounting hole 43 is formed so as not to be separated from the retainer 40.

The bearing retainer 40 is preferably formed of a light plastic material.

3D is a view showing a contact state of a ball bearing in which three-point contact is made.

Referring to Figures 3a and 3d will be described the operation of the ball bearing mounting of the present invention.

In the needle roller bearing support structure of the present invention, the inclined surface 33a is formed at one lower side of the helix gear 33 connected to the output shaft 30 via the needle roller bearing 37, and the inclined surface 33a is The point contact with the ball bearing 50 at the contact point C1.

In addition, the contact point C2 is a point contact between the bottom surface of the ball bearing 50 and the output shaft 30, the contact point C3 is a point contact between the side of the ball bearing 50 and the final gear 35.

The ball bearing 50 is located at a portion where friction occurs due to the difference in relative speed between the components such as the hub 31, the helix gear 33, and the final gear 35 adjacent to the output shaft 30, By making the point contact with the parts and the ball bearing 50 at the same time in three places, it is possible to obtain axial and radial reaction forces (R1, R2, R3 in FIG. 3D), and the reaction forces (R1, R2, R3). This prevents contact with adjacent mating parts.

That is, in the rotational central axis of the ball bearing 50 of the present invention, all the relative motions acting from the three counterparts in three-point contact are absorbed, and from the bottom inclined surface 33a of the helix gear 33 from the ball bearing 50 Received reaction force (R1) to prevent the occurrence of gear shifting or eccentricity.

While the exemplary embodiments of the present invention have been illustrated and described as described above, various modifications and other embodiments in the construction of the apparatus may be made by those skilled in the art. Such modifications and other embodiments will be considered and included in the appended claims without departing from the true spirit and scope of the invention.

Figure 1a is a cross-sectional view showing an example of a conventional manual transmission structure,

FIG. 1B is an enlarged view of portion A of FIG. 1A;

2 is a cross-sectional view showing a axial thrust and a radial thrust generation direction and a position where the gear and the eccentricity are generated in the conventional manual transmission structure,

3a to 3d is a view showing a needle ball bearing support structure of a manual transmission according to the present invention.

<Description of the symbols for the main parts of the drawings>

31: Hub 33: Helix Gear

35: final gear 37: needle roller bearing

40: bearing retainer 41: retainer body

43: ball bearing mounting hole 50: ball bearing

60: ball bearing assembly

Claims (5)

The hub 31, the helix gear 33 and the final gear 35 are coupled around the manual transmission output shaft 30, A needle roller bearing 37 is installed between the output shaft 30 and the helix gear 33, A part of the bottom surface of the helix gear 33 is formed as the inclined surface 33a, A ball bearing assembly 60 equipped with a ball bearing 50 is provided to simultaneously make three-point contact with adjacent parts on the lower surface and the side surface, including the inclined surface 33a.  The ball bearing assembly 60 includes a bearing retainer 40 having a plurality of bearing mounting holes 43 and a plurality of ball bearings 50 mounted to the bearing retainer 40. The bearing retainer 40 is composed of a circular body 41, and a bearing mounting hole 43 formed in a plurality at regular intervals along the circumference of the circular body 41, of the circular body 41 The side cross section is formed in a shape having triangular outer three sides 41a, 41b, 41c around it, A needle ball bearing support structure for a manual transmission, characterized in that gear shift and eccentricity are prevented from occurring due to axial and radial thrust (P1, P2) generation in the manual transmission. The method according to claim 1, The ball bearing assembly (60) is a needle ball bearing support structure of a manual transmission, characterized in that made of a structure connected to the needle roller bearing (37). delete delete The method according to claim 1, The bearing mounting hole 43 is a manual transmission, characterized in that when the ball bearing 50 is mounted, a portion of the ball bearing 50 is exposed to the outside of the triangular outer three sides (41a, 41b, 41c) Needle ball bearing support structure.

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