JPH0649966Y2 - PTO idler gear mounting structure for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a PTO idler gear mounting structure for an automatic transmission including a torque converter and a transmission.

(Prior Art) FIG. 1 is a partial vertical sectional view of an automatic transmission to which the present invention is applied. First, an outline of a torque converter and a PTO of the automatic transmission will be described with reference to this drawing.

The transmission housing 1 integrally includes a housing portion 1a for housing a torque converter at a front end portion (an end portion on the engine side) in the axial direction. The torque converter 4 includes a pump impeller 7, a turbine impeller 8, and a stator impeller. 9 and a reversing stator impeller 10. The pump cover 16 of the pump impeller 7 is connected to the flywheel of the engine via the front cover 14, and the inner peripheral end is connected to the pump cylinder shaft 13, and the PTO is provided at the rear end of the pump cylinder shaft 13.
A drive gear 13a is formed. Turbine impeller 8
Is connected to a turbine shaft 11 via a turbine hub 18, a stator impeller 9 is supported by a cylinder portion of a stator support 15 via a one-way clutch, and a reverse stator impeller 10 is connected to a stator cylinder shaft via a one-way clutch. 12 connected. The turbine shaft 11 and the stator cylinder shaft 12 extend into the rear transmission housing 1 and are connected to various planetary gear mechanisms, a clutch mechanism, a brake mechanism, and the like, which are not shown, and are geared here to transmit power to the output shaft. It has become.

The PTO idler gear 33 is disposed so as to be adjacent to the rear of the torque converter 4, and the idle gear housing portion and the housing portion of the torque converter 4 are separated by a partition wall 23 so as to prevent oil from leaking. The idler gear 33 and the like supported by the idler shaft 25 are inserted through the insertion opening 22 of the housing 1 before the torque converter is assembled.

In such an automatic transmission, the conventional idler shaft cannot be removed after fixing the stator support, so it is necessary to disassemble the idler gear with the idler shaft fixed, and the outer diameter of the idler gear is smaller than the inner diameter of the insertion port. It has been limited to a size that does not extend outside.
Therefore, since the outer diameter of the PTO idler gear is limited, P
The degree of freedom in setting the TO reduction ratio is limited. Also, the PTO idler gear must be positioned deeper inward from the PTO opening, and it takes time and effort to assemble the PTO gear that meshes with the idler gear.

(Purpose of the Invention) The purpose of the present invention is to make it possible to set the idler gear so as to project outward from the inner diameter of the insertion hole of the gear of the housing, etc., and increase the degree of freedom in setting the reduction ratio of the PTO. At the same time, the idle gear assembly should be compact and simple.

(Technical means for achieving the object) In order to achieve the above object, the present invention provides a PTO idler gear that houses a torque converter in the front part of a transmission housing and engages with a gear provided on an impeller to perform PTO drive. In an automatic transmission provided in a housing, a boss protruding forward is formed on a stator support that is fastened inside the housing, and an idler shaft is pierced and supported by the boss. A counterbore is formed, and a steel ball fitted in the counterbore is meshed with the ball support hole of the idler shaft,
With the stator support fixed, the steel ball can be removed by moving the idler shaft rearward, and an idler gear with a radius larger than the shortest radial distance from the axis center of the idler shaft to the inner peripheral edge of the gear slot The ball bearing is mounted on an idler shaft, and the inside and outside of the front end edge of the ball bearing are locked by the inside and outside snap rings, respectively.

(Embodiment) FIG. 1 is a partial vertical cross-sectional view of an automatic transmission to which the present invention is applied, and the outline of the entire structure has been described in the section of the description of the prior art, and thus the duplicated description will be omitted.

The rear end surface 15b of the stator support 15 abuts on the mounting surface (step portion) 1b of the housing 1 from the front via a gasket or the like, and is fixed by a bolt 17. Stator support
The rear end surface 15b of the disk 15 is used as a pressing surface for the stroke end of the disc brake D, and the brake plate 50 of the disc brake D is in contact therewith. A boss 24 projecting forward is integrally formed with the stator support 15, and an inner peripheral hole of the boss 24 penetrates in the front-rear direction.
The rear surface portion of the stator support 15 that corresponds to approximately the portion is
It is recessed forward from the rear end surface 15b through a step portion 15c.

As shown in FIG. 2, a counterbore hole 28 having a rear end opening is formed at the rear end of the inner peripheral surface of the boss 24, while the rear end of the idler shaft 25 fitted and supported by the boss 24 is supported. Further, a radial ball support hole 29 is formed by a drill or the like at a position corresponding to the spot facing hole 28. A steel ball 30 fitted in the counterbore hole 28 is meshed with the support hole 29 to prevent the idler shaft 25 from rotating and preventing it from slipping forward.

In FIG. 1, the distance A between the rear end surface 15 b of the stator support 15 and the rear end surface of the idler shaft 25 is defined by the counterbore 28 of the boss 24.
Is the same as or slightly longer than the axial length (diameter of the steel ball 30) B of, so that the steel ball 30 can be pulled out by moving the idler shaft 25 rearward within the distance A. ing.

A screw hole 27 is formed in the front end surface of the idler shaft 25, and a ball bearing 34 is fitted on the outer peripheral surface of the front end portion, and the rear end edge of the inner race 34a of the ball bearing 34 contacts the front end edge of the boss 24. The front end edge of the inner race 34a is locked by an inner snap ring 36 engaged with the annular groove of the idler shaft 25. Ball bearing 34
An idler gear 33 is fitted on the outer peripheral surface of the outer race 34b, the rear end edge of the outer race 34b of the ball bearing 34 abuts on the rear end step of the idler gear 33, and the outer race 34b front end edge is locked to the annular groove of the idler gear 33. It is locked by a snap ring 37.

The outer diameter Y of the idler gear 33 is larger than the inner diameter X of the gear insertion slot 22 to which the partition wall 23 is attached, and the outer diameter Y of the idler gear 33 extends outward in the radial direction. Facing. Ie idler shaft 25
The idler gear 33 having a radius larger than the shortest radial distance from the shaft center to the inner peripheral edge of the gear or the like insertion opening 22 is mounted on the idler shaft 25 via a ball bearing 34. Therefore, the outer diameter Y of the idler gear 33 can be set to a large value, and the idler gear 33 can be moved outward in the radial direction as much as possible within the range in which it does not project outward from the opening 39.

The assembling method will be described. (1) Insert the idler shaft 25 into the boss 24, position it with the steel balls 30, and move the stator support 15
Is inserted into the housing 1 and its rear end surface 15b is fixed to the mounting surface 1b of the housing 1 with bolts 17.

(2) Before inserting the ball bearing 34, the outer snap ring 37
The idler gear 33 with the removed state is first inserted from the insertion port 22 and temporarily placed on the outer peripheral side of the idler shaft 25.

(3) Ball bearing 34 from the front, idler shaft 25 and idler gear
Insert between 33. At this time, the front end screw hole 27 of the idler shaft 25
Then, the ball bearing 34 is press-fitted by screwing a press-fitting jig or the like onto it.

(4) The inner and outer circumferences of the front end of the ball bearing 34 are locked by snap rings 36 and 37, respectively.

The disassembly method will be described. (1) Remove the inner snap ring 36 of the ball bearing 34, push the idler shaft 25 rearward, and make a hole in the steel ball 30.
Remove from 29 mag. At this time, since the idler shaft 25 can move rearward at least by the distance A, the steel ball 30 can be pulled out from B ≦ A.

(2) A jig is screwed into the screw hole 27 of the idler shaft 25, and the idler shaft 25 is pulled out forward.

(3) Remove the idler gear 33 with the ball bearing 34 forward from the insertion opening 22.

(Effect of the Invention) As described above, according to the present invention, the stator support is provided.
15 Boss 24 counterbore hole 28 and idler shaft 25 ball support hole 29
The steel ball 30 meshed with is made removable by moving the idler shaft 25 rearward with the stator support 15 fixed, and the front end of the ball bearing 34 fitted between the idler gear 33 and the idler shaft 25 is Since the inner and outer snap rings 36, 37 are engaged, the outer diameter Y of the idler gear 33 can be assembled and disassembled even if it is made larger than the inner diameter X of the gear or the like insertion opening 22 of the housing 1 to the outside. It will be possible.

Therefore, the outer diameter Y of the idler gear 33 can be increased, and the degree of freedom in setting the PTO reduction ratio can be increased, and the structure can be stored in a simple and compact structure.

To explain the important advantages of the present invention again in detail, the mounting structure of the idler shaft 25 to the stator support 15 is devised, whereby the radial direction from the shaft center of the idler shaft 25 to the inner peripheral edge of the gear or the like insertion opening 22 is determined. Even if the idler gear 33 having a radius larger than the shortest distance is installed, the gear insertion slot can be installed without disassembling the transmission in the transmission housing when disassembling the idler gear.
The idler shaft 25 can be easily removed from the stator support 15 and the idler gear 33 can be removed from the side of 22 to facilitate disassembly work of the idler gear and the like.

That is, as a structure for attaching the idler shaft 25 to the stator support 15, the idler shaft 25 is pierced and supported by the boss 24 of the stator support 15, and the counterbore 28 is formed at the rear end of the inner peripheral surface of the boss.
And the steel ball 30 fitted in the counterbore hole 28 into the idler shaft 25.
It has a structure that meshes with the ball support hole 29 of, so that even when the stator support 15 is fixed, the steel ball 30 can be removed only by moving the idler shaft 25 rearward, and the idler shaft 25 can be pulled out forward. As a result, the idler gear 33 with the ball bearing 34, as described above, is
You can easily take it forward from 22.

[Brief description of drawings]

FIG. 1 is a vertical sectional partial view of an automatic transmission to which the present invention is applied,
FIG. 2 is a view on arrow II of FIG. 1 ... Housing, 2 ... Torque converter, 7 ... Pump impeller, 13a ... Gear, 15 ... Stator support, 2
2 …… Gear insertion slot, 24 …… Boss, 25 …… Idler shaft, 2
8 …… counterbore hole, 29 …… support hole, 30 …… steel ball, 33 …… PTO
Idler gear, 34 …… Ball bearing, 36,37 …… Snap ring

Claims (1)

[Scope of utility model registration request] 1. An automatic transmission having a torque converter housed in a front portion of a transmission housing, and a PTO idler gear that engages with a gear provided on an impeller to drive a PTO in the housing and is fastened inside the housing. By forming a boss protruding forward on the stator support,
The idler shaft is supported through the boss, a counterbore hole is formed at the rear end of the inner peripheral surface of the boss, and a steel ball fitted in the counterbore hole is meshed with the ball support hole of the idler shaft to fix the stator support. In this state, the steel ball can be removed by moving the idler shaft rearward, and an idler gear with a radius larger than the shortest radial distance from the axis center of the idler shaft to the inner peripheral edge of the gear insertion slot can be mounted on the ball bearing. Mounted on an idler shaft via the inner and outer sides of the ball bearing, and the inner and outer sides of the front end of the ball bearing are locked by inner and outer snap rings, respectively.
PTO idler gear mounting structure.