JPS61109921A - Synchromesh transmission - Google Patents

Abstract

PURPOSE:To make synchromesh action smooth, by forming a detent so that chamfered parts of splines each of a sleeve and synchronizing become in a line between a hub holding a sleeve and the synchronizing ring. CONSTITUTION:Protrusions 42, 43 forming a semispherical-surface like state are formed on both end faces in an axial direction of a hub 34 of synchronizing mechanisms 17, 18, and detent parts 44, 45 having slopes 44a, 44a, 45a, 45a along a rotating direction formed on confronting faces each of synchronizing rings 32, 40 each of forward side and backward side which have extended so as to confront with both the end faces in the axial direction of the hub 34. These protrusions 42, 43 each and detent parts 44, 45 are made to suppress and involve always through suppression force of coned-disc springs 46, 47 under a state wherein locationing has been performed so that chambered parts each of a spline part 35c and spline parts 33, 41 of synchronizing rings 32, 40 become in a line.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to an IvJ control device for a transmission, and particularly to a belt-type continuously variable transmission with an electromagnetic powder clutch installed in the engine drive system of a vehicle. This invention relates to an improvement of a synchronous meshing device having a gear synchronization switching section that directly connects the output rotation of the engine from a neutral position for forward movement or reverses it for reverse movement to transmit power.

E. Prior Art 1 The overall structure of a conventional belt-type continuously variable transmission equipped with an electromagnetic powder clutch of this type is shown in FIG.

That is, in this FIG. 3, reference numeral 1 is a Yi magnetic powder type clutch, 2 is a continuously variable transmission mechanism, and this continuously variable transmission #4 is
2 is a forward/reverse switching section 3. A hydraulic control unit 6 that controls the pulley ratio conversion unit 4, the final reduction unit 5, and the boolean ratio conversion unit 4 by lJm.
It is made up of spikes.

The electromagnetic powder clutch 1 has a ring-shaped drive member 8 fixed on the crankshaft 7 from the engine, and a splined transmission input shaft 11 slidably only in the axial direction on the crankshaft 7. The drive member 9 has a disc-shaped drive member 9 engaged with the drive member 9, and the electromagnetic powder interposed in the gap between the members 8 and 9 is chained by energizing and de-energizing the coil 1o in the drive member 9 by controlling current flow. The driving force from the crankshaft 7 to the speed change input shaft 11 is connected and disconnected by coupling and uncoupling. By performing this current supply control in conjunction with the operation of the switching unit 3, from each range (P (parking) or N to neutral), D (drive) for forward, R (low) or R for reverse. When switching to the reverse (reverse) range, clutch 1 is automatically connected and disconnected, making it unnecessary to operate the clutch pedal.

The switching section 3 also connects the speed change input shaft 11 and the main shaft 12.
A gear 13 on the forward engaged side is fixed to the input shaft 11, and a gear 13 on the backward engaged side is fixed to the main shaft 12.
4 are loosely fitted to each of these gears 13 and 14, and a counter gear 15. The idle gear 16 is meshed with the forward side synchronizing mechanism 17 between the main shaft 12 and each gear 13, 14.
．． 18 are respectively provided, and by selective operation of a shift fork (not shown), the driving force inputted to the speed change input 111111 is directly connected to the main shaft 12 to move forward, connected via a gear train to move backward, Communicate to each side.

Further, the pulley ratio converting section 4 has the main shaft 12 and a sub-shaft 19 parallel to the main shaft 12, and on each of these shafts 12.19 there are a main pulley 20.21 of variable diameter, respectively.
is provided across the drive belt 22, and is provided with hydraulic servo devices 23, 24 for its variable diameter operation. The variable diameter operation of both the main and sub pulleys 20 and 21 is controlled by the hydraulic control section 6 having the hydraulic pump 2G.
The drive transmitted to the main shaft 12 is controlled by the hydraulic control circuit 25 via these two hydraulic servo devices 23 and 24 under conditions such as vehicle speed, throttle opening depending on the degree of accelerator depression, and engine speed. The force is transmitted to the f'J shaft 19 in a continuously variable manner, and the differential gear 1 of the final reduction section 5 is
The left and right axles 28 and 29 can be rotationally driven via the flap structure 27.

Here, the detailed configuration of the gear synchronous switching section 3 of the conventional continuously variable transmission is shown in FIG. 4, and the forward side,
The synchronizing mechanisms 17 and 18 on the reverse side have a part in common and are arranged back to back.

Forward side synchronizer mechanism 1 provided at the input 01111
A spline part 30 and a cone part 31 are formed on the gear 13 of No. 7, a synchro ring 32 having the spline part 33 is fitted into the cone part 31, and a sleeve 35 is attached to the hub 34 which is integrally connected to the main IpH 112. When the synchro key 36 is inserted into the key groove 4a of the hub 34, the protrusion 36 of the synchro key 3G is inserted by the elastic force of the spring 37.
A is fitted into the inner groove 35a of the sleeve 35 so as to be removable and removable, and a shift fork (not shown) is connected to the outer groove 351).

Similarly to the above, the spline part 38 and the cone part 39 are formed for the gear I'714 of the 1n retreat side synchro IM 418, and the synchro ring 40 having the spline part 41 is fitted into the cone part 39. The hub 34
, the synchro key 36, and the sleeve 35 constitute a synchro mechanism. Both ends of the synchro key 36 are connected to the full 32a of the synchro ring 32.40.
, 40a +,=y, but the width of the groove is larger, and when synchronizing, the end of the synchronization key 3G is brought into contact with the end face in this groove 32a or 40a, The synchro ring 32 or 40 can be rotated independently.

However, in this conventional configuration, when transmitting power to the forward side, the sleeve 35 is first selected from the neutral position shown in FIG. make it move. Along with this operation, the synchro key 36
causes the sink 1 colling 32 to be pressed against the cone portion 31 of the gear 13, and for this reason, the synchro ring 32 is dragged by the rotation of the gear 13 and rotates by the gap between the end of the synchro key 36 and f32a, Each of the spline portions 35c and 33 of the sleeve 35 and the synchro ring 32
The situation will be different as shown in the figure. Next, sleeve 3
5 is further activated, the synchro ring 32 prevents the synchro key 36 from sliding, so the protrusion 3
6a and jf435a are disengaged, only the sleeve 35 moves, and its spline portion 35c is connected to the synchro ring 3.
It is strongly abutted against the spline portion 33 of No. 2 as shown in Fig. 5).

Therefore, the component forces in the two spline parts 35c and 32a move, and the rotation of the gear 13 is transmitted to the main shaft 12, so that they are synchronized, and in this way they are synchronized. Then, the synchro ring 32 no longer needs to transmit the rotation from the gear 13 to the main shaft 12 and becomes free in the rotation direction, so that the spline portion 35c of the sleeve 35 is connected to the synchro ring as shown in FIG. 5(C). spline part 30 of gear 13 while pushing away spline part 32
The input shaft 11 is connected to the main shaft 12 by engaging with the input shaft 11, and then the electromagnetic powder clutch 1 is engaged to transmit the driving force, and this operation is the same even when reversing.

Note that Japanese Patent Application Laid-Open No. 48-67649 has been proposed as a prior art for meshing a synchronous meshing device.

[Technical Problem 1 of the Invention] However, in the conventional case with this configuration, since the spline portion 35c of the sleeve 35 is engaged with the spline portion 30 of the gear 13 while pushing away the synchro ring 32, when the vehicle starts ! When moving forward or backward, the driver can change the feeling of catching when both spline portions 35c and 33 are engaged during shift operation from N range to D or R.
He mistakenly thinks that the shift operation to the range has been completed and depresses the accelerator, but at this point, the electromagnetic powder clutch 1 is not yet connected, and therefore the intended starting or reversing action is not performed (q Therefore, the driver tried to shift again without returning to the N range and shifted to J5, but the clutch was turned on with the engine speed increasing above the fitting ring and the gear V started to rotate. As a result, the balk action is not performed and so-called gear squeal occurs.

[Objective of the Invention 1] The present invention was proposed in order to solve the above-mentioned problems of the conventional art, and it takes a means to always arrange the chamfer parts of the hub and the synchro ring on the same line, and to synchronize them during operation. It is an object of the present invention to provide a synchronous meshing device for a transmission that eliminates the feeling of sticking that causes the user to mistakenly believe that engagement is complete, and provides smooth synchronous engagement action.

[Structure of the Invention] In order to achieve the above object, the present invention has a forward side synchronizing mechanism and a backward side synchronizing mechanism and a shift operation sleeve in the engine drive system of a vehicle, and changes the output rotation of the engine from a neutral position to the forward side. Alternatively, in a configuration provided with a switching VZ position that selects and synchronously switches to the backward side, both axial end surfaces of the hub that freely retains the sleeve and the forward side opposite thereto.

A hemispherical protrusion that is always open in resilient engagement with the opposing surface of each synchro ring on the retreating side and positioned so that the chamfer parts of the spline parts of the sleeve and the synchro ring are on the same line. , and a detent portion having an inclined surface in the direction of synchronous engagement.

[Embodiment 1] Hereinafter, an embodiment of the synchronizer according to the present invention will be described in detail with reference to FIG. 1 and FIG. 2 (2), (2).

The embodiment device shown in FIG. 1 corresponds to the conventional device shown in FIGS. 3 and 4, and the same reference numerals represent the same or corresponding parts in each of these figures. In the device, a hemispherical protrusion 42.43 is provided on both axial end surfaces of the hub 34 of the synchronizing mechanism 17.18, and a forward-moving side protrusion 42.43 is provided on the forward side extending so as to face both axial end surfaces of the hub 34. and each synchro ring 32 and 4 on the backward side
0, inclined surfaces 44a, 44a and 45a, 45a are provided along the synchronous engagement direction, that is, the rotational direction.
The detent portions 44 and 45 having a
4.45 and the spline portion 35C2 of the sleeve 35.
and the spline portion 3 of the synchro ring 32.40.
3.41 are positioned so that they are on the same line, and are constantly prevented from being pressed into engagement by the elastic force of disc springs 46 and 47.

Therefore, in the case of the configuration of the device of this embodiment, when the hub 34 is in the neutral state and is not rotating, the elastic force of the spring 4 (III) (3, 47) causes each The detent portion 44.45 and the hemispherical protrusion 42.43 are always resiliently engaged, and this engagement results in a synchronous engagement with the spline portion 35c of the sleeve 35.
, 13 and the chamfer parts of the spline parts 33.41 of the synchro ring 32.40 are positioned so that they are on the same line. As shown in FIG. 2(b), the synchro key 3 is inserted into the keyway 4a of the hub 34.
Due to the deviation ■A of 6, each spline portion 35c and 33.
Until each chamfer part meshes with 41, there is no catch on the way, and smooth operation is possible, and the balk action can be performed accurately.
3. Regarding the shift operation when the 14 is rotating,
The conventional action is reduced by 1q.

[Effects of the Invention] As described in detail above, according to the present invention, the axially opposite end surfaces of the hub that slidably hold the sleeve, and the opposing surfaces of the synchro rings on the forward and backward sides facing the same, , forming a detent part having an inclined surface along the synchronous engagement direction of the protrusion having a hemispherical shape with the protrusion, and positioning these so that the chamfer parts of each spline part of the sleeve and the synchro ring are on the same line. Since the chamfer parts of each spline part are engaged with each other at all times, there is no catch during the shift operation, and the shift operation can be carried out smoothly, unlike conventional methods. There is no risk of creating the illusion that synchronous engagement has been completed, or of gear shifting due to no balk action, greatly improving operability and shift feel when starting or reversing. It has excellent features such as a simple structure and easy implementation.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a cross-sectional view showing the configuration of an embodiment of the open meshing device according to the present invention, and FIG. FIG. 3 is an explanatory diagram showing the synchronous engagement of the detent portion, and FIG. 3 is an overall configuration diagram showing a belt-type continuously variable transmission with an electromagnetic powder clutch to which the conventional device same as above is applied, and FIG. FIG. 5(c) is a sectional view showing details of the gear synchronous switching section of the continuously variable transmission. ■> , , (C) are explanatory diagrams sequentially showing the synchronous engagement action same as above. 1... Electromagnetic powder clutch, 2... Continuously variable transmission mechanism, 3
... Forward/forward switching section, 4... Boob ratio conversion section, 5.
... Final reduction section, 6... Hydraulic control section, 7... Crankshaft, 11... Speed change input shaft, 12... Main shaft, 13.1
4...Advance test gold side. Reverse engaged side number gear, 17.1'8...Advance side, retreat side synchro mechanism, 19...Subshaft, 20.21...Main, sub pulley, 30, 33.35c, 38. 41・-
・Spline part, 31.39... Cone part, 32.4
0... Synchro ring, 34... Hub, 34a...
・Hub key groove, 35...Sleeve, 35a...Sleeve groove, 36...Synchro key, 36a...Protrusion of synchro key, 37...-Spring, 42.4
3... Hemispherical protrusion of the hub, 44.45...
・Detent part of synchro ring, 44a, 45a・
... Sloped surface of detent part, 46, 47... spring. Patent Applicant Fuji Heavy Industries Co., Ltd. Agent Patent Attorney Jundo Nobu Kobashi Patent Attorney Susumu Murai Figure 1 Figure 2 (C1) (b) (G)
(b) (C)

Claims (1)

[Claims] The engine drive system of the vehicle has forward and reverse side synchronizing mechanisms and a shift operation sleeve, and is provided with a switching device that selects and synchronizes the output rotation of the engine from a neutral position to the forward side or the reverse side. In the configuration, both axial end surfaces of a hub that slidably hold the sleeve;
The chamfer portions of the spline portions of the sleeve and the synchro ring are positioned so as to be in constant pressure engagement with the facing surfaces of the synchro rings on the forward and backward sides opposing this. 1. A synchronizing meshing device for a transmission, characterized in that a hemispherical protruding portion and a detent portion having an inclined surface in the direction of synchronizing engagement are formed respectively.