DE102019114441A1 - Synchronizing device with a spring element for presynchronization - Google Patents

Abstract

The invention relates to a synchronization device for a transmission, comprising at least one synchronizer ring (1) with toothed elements (2) on an outer circumferential surface, an axially movable sliding sleeve (3) with toothed elements (4) on an inner circumferential surface, a sleeve carrier (5) and at least one captive on the at least one synchronizer ring (1) arranged spring element (6) for pre-synchronization between the sliding sleeve (3) and the at least one synchronizer ring (1), wherein the spring element (6) is formed in one piece from a sheet metal and at least positively on a tab (7) of the at least one synchronizer ring (1) is arranged.

Description

The invention relates to a synchronizing device for a transmission, comprising at least one synchronizer ring, an axially movable sliding sleeve and a sleeve carrier.

Synchronizing devices are used in different variants in motor vehicle transmissions. They are used to adapt the speed between the gear wheels of different gear ratios to be coupled and thus to reduce the shifting force and the wear in the transmission as well as to improve shifting comfort. A variant of the synchronization device that is used particularly frequently is designed as a locking synchronization and has a cone friction clutch, which can be designed as a single-cone synchronization or as a multi-cone synchronization. In order to ensure correct synchronization of the gear change, synchronization is generally carried out first, with the different speeds of idler gear and shaft being adjusted to one another. Then the idler gear is coupled to the shaft by a positive connection. A coordinated locking function is required to ensure that synchronization takes place first and then coupling.

Conventional locking synchronizers usually have a sleeve carrier or synchronizer body with several pressure pieces distributed over the circumference, which are preloaded in the radial direction by means of springs. The pre-tensioned pressure pieces are used for pre-synchronization. The actual synchronization takes place via a cone friction clutch with a single cone on the synchronizer ring. The entire frictional power is absorbed by this cone friction clutch. The torque is transmitted via the toothing of the sliding sleeve, which connects the idler gear or gear wheel, the synchronizer ring with the sleeve carrier or the shaft when switched. The locking function results from the interaction of the so-called roof teeth of the synchronizer ring and the sliding sleeve. The pressure pieces are not only preloaded in the radial direction by means of the springs, but are also movable in the axial direction. Known pressure pieces for presynchronization usually consist of two individual parts, a spring and a pressure body. With such a design of the pressure piece there is often the risk of the pressure piece jumping out or jamming, which can lead to gear damage.

A synchronization device for transmission of known type with several pressure pieces in the sleeve carrier is for example from DE 10 2005 054 085 A1 known. Furthermore, the DE 10 2012 214 025 A1 a synchronizing ring made of sheet metal for a synchronizing device of a gear change transmission with at least one friction surface for friction pairing with a friction partner. To prevent rotation, the synchronizer ring comprises a number of inner tabs and a number of outer tabs, the outer tabs at the same time representing axial stops for pressure pieces in the sliding sleeve and serving for pre-synchronization.

The object of the present invention is to create an alternative synchronization device which does not require pressure pieces for presynchronization. The object is achieved by the subject matter of claim 1. Preferred embodiments can be found in the dependent claims.

A synchronizing device according to the invention for a transmission comprises at least one synchronizer ring with toothed elements on an outer circumferential surface, an axially movable sliding sleeve with toothed elements on an inner circumferential surface, a sleeve carrier and at least one captive spring element arranged on the at least one synchronizer ring for pre-synchronization between the sliding sleeve and the at least one synchronizer ring wherein the spring element is formed in one piece from a sheet metal and is arranged at least in a form-fitting manner on a tab of the at least one synchronizer ring.

A tab on the at least one synchronizer ring is to be understood as a thin-walled formation which is essentially flat and extends in the axial direction. The tab is in particular formed in one piece on the at least one synchronizer ring. A plurality of tabs are preferably formed on the at least one synchronizer ring, distributed evenly over the circumference, with the respective tab being formed axially in the direction of the sleeve carrier. A spring element for presynchronization between the sliding sleeve and the at least one synchronizer ring is preferably arranged on each tab. The spring element is advantageously punched out of the sheet metal, in particular a sheet steel, and shaped.

The tab of the at least one synchronizer ring preferably has a recess for partially receiving the spring element on a radially inwardly directed surface. The recess is designed as a recess radially outward in the radially inwardly directed surface of the tab and shaped to correspond to the spring element in such a way that the spring element is at least partially received and can thus penetrate radially into the recess or the tab. At the same time, this enables the spring element to be fixed in position on the tab.

Furthermore, the recess on the tab preferably has a slope in the radial direction. In other words, the base or bottom of the recess, which is formed in the radial direction outward on the inwardly directed surface of the tab, is not straight, but rather inclined or angled. In other words, the radial depth of the recess is not constant, but rather formed radially deeper in a first region of the tab than in a second region of the tab.

The spring element preferably has a first and second integrally interconnected spring leg, the first spring leg at least partially resting in the recess on the tab, and the second spring leg resting opposite the first spring leg on a circumferential section of the at least one synchronizer ring. In particular, the first and second spring legs form an acute angle, preferably an angle that is smaller than 45 °. In a mounted state of the spring element on the at least one synchronizer ring, the spring element is supported with the first leg against the tab of the at least one synchronizer ring and with the second leg against the peripheral section of the at least one synchronizer ring. As a result, the two spring legs are at least partially elastically deformed, with a spring preload force being generated.

Furthermore, the spring element preferably has a third and fourth spring leg, the third spring leg being connected in one piece to the second spring leg and the fourth spring leg being connected in one piece and at an angle to the third spring leg, and the sleeve carrier at least partially between the third and fourth spring legs is recorded. The third and fourth spring legs thus form a receiving area for the sleeve carrier, the third and fourth spring legs at least partially encompassing the sleeve carrier and thereby connecting the spring element to the sleeve carrier.

An apex area is preferably arranged between the third and fourth spring legs in a recess on an inner peripheral surface of the sliding sleeve. A vertex area between the third and fourth spring legs is to be understood as an area of the spring element which integrally connects the third and fourth spring legs to one another. The apex area between the third and fourth spring legs forms a bulge which penetrates radially into the recess on the inner circumferential surface of the sliding sleeve. The recess on the inner circumferential surface of the sliding sleeve is groove-shaped or dome-shaped and at least partially accommodates the spring element.

The spring element is preferably designed to be pushed axially into the at least one synchronizer ring, the spring element being at least partially elastically deformed. In particular, the spring element is pressed into the at least one synchronizer ring, the first and second spring legs of the spring element being brought closer together until the final position of the spring element relative to the at least one synchronizer ring is reached. In the final position of the spring element on the at least one synchronizer ring, the first spring leg snaps into the recess on the tab and fixes the spring element in relation to the at least one synchronizer ring.

• 1 eine vereinfachte schematische Perspektivschnittdarstellung zur Veranschaulichung eines Ausschnitts der erfindungsgemäßen Synchronisiereinrichtung,
• 2 eine vereinfachte schematische Perspektivdarstellung zur Veranschaulichung eines Ausschnitts eines Synchronrings der erfindungsgemäßen Synchronisiereinrichtung gemäß 1,
• 3 eine vereinfachte schematische Schnittdarstellung zur Veranschaulichung eines Ausschnitts des Synchronrings gemäß den 1 und 2,
• 4 eine vereinfachte schematische Perspektivdarstellung zur Veranschaulichung eines Federelements der erfindungsgemäßen Synchronisiereinrichtung gemäß 1, und
• 5a-5d vier vereinfachte schematische Schnittdarstellungen zur Veranschaulichung eines jeweiligen Ausschnitts während einer Montage des Federelements am Synchronring.

Further measures improving the invention are shown in more detail below together with the description of a preferred exemplary embodiment of the invention with reference to the figures. Here shows

• 1 a simplified schematic perspective sectional view to illustrate a section of the synchronizing device according to the invention,
• 2 a simplified schematic perspective view to illustrate a section of a synchronizer ring of the synchronizing device according to the invention 1 ,
• 3 a simplified schematic sectional view to illustrate a section of the synchronizer ring according to FIG 1 and 2 ,
• 4th a simplified schematic perspective view to illustrate a spring element of the synchronizing device according to the invention according to FIG 1 , and
• 5a-5d four simplified schematic sectional views to illustrate a particular section during assembly of the spring element on the synchronizer ring.

According to 1 has a synchronizing device for a - not shown here - gear a synchronizer ring 1 with tooth elements 2 on an outer peripheral surface, an axially movable sliding sleeve 3 with tooth elements 4th on an inner peripheral surface, a sleeve carrier 5 and one captive on the synchronizer ring 1 arranged spring element 6th for pre-synchronization between the sliding sleeve 3 and the synchronizer ring 1 . Only a section of the synchronization device is shown here, so that only one spring element is visualized. However, several identical spring elements are distributed over the circumference 6th on the synchronizer ring 1 arranged. Every spring element 6th is made in one piece from sheet metal and is positively locked on a respective tab 7th of the synchronizer ring 1 arranged. To do this, every cloth has 7th of the synchronizer ring 1 a recess on a radially inwardly directed surface 8th to partially accommodate the respective spring element 6th on.

The spring element 6th , this in 1 in an assembled state and in 4th is shown in an isolated and non-assembled state, has a first and second integral and angled spring legs connected to one another 6a , 6b on, with the first spring leg 6a in the assembled state at least partially in the recess 8th on the rag 7th comes to rest, and wherein the second spring leg 6b opposite from the first spring leg 6a on a peripheral portion of the synchronizer ring 1 comes to the plant. Furthermore, the spring element 6th a third and fourth spring leg 6c , 6d on, with the third spring leg 6c one piece with the second spring leg 6b is connected and the fourth spring leg 6d one-piece and angled with the third spring leg 6c connected is. The socket carrier 5 is at least partially between the third and fourth spring legs in the assembled state 6c , 6d recorded. On an inner peripheral surface of the sliding sleeve 3 is a dome-shaped recess 10 formed, in which a rounded apex area 9 between the third and fourth spring leg 6c , 6d is arranged.

According to 2 is the synchronizer ring 1 partially shown, in the circumferential direction on the tooth elements 2 of the synchronizer ring 1 adjacent to the lobe 7th is formed in the axial direction. Hence the rag 7th parallel to an axis of rotation of the synchronizer ring 1 educated. On the inside of the flap 7th is the recess 8th to accommodate the first spring leg 6a of the spring element 6th formed obliquely. In other words, the recess 8th on the rag 7th a slope in the radial direction. This is for the first spring leg 6a of the spring element 6th an axial stop surface is formed in the assembled state, which prevents unwanted loosening of the spring element 6th from the rag 7th prevented.

3 shows a sectional view through the tab 7th of the partially shown synchronizer ring 1 . The incline forms a sloping bottom of the recess 8th in the rag 7th . In other words, the depth of the recess changes 8th in the axial direction which is parallel to the axis of rotation.

The 5a to 5d visualize the four assembly steps of the spring element 6th on the synchronizer ring 1 . In 5a becomes the spring element 6th with the first and second spring leg 6a , 6b ahead in the direction of the synchronizer ring 1 parallel to the arrow P pushed. According to 5b penetrates the spring element 6th in the axial direction radially between the flap 7th on the synchronizer ring 1 and a peripheral surface of the synchronizer ring 1 one, the first and second spring legs 6a , 6b are elastically approximated to one another. After 5c are the first and second spring legs 6a , 6b approached each other with maximum elasticity, the spring element 6th further into the synchronizer ring 1 is pressed in. The first spring leg 6a comes on the rag 7th to the system. According to 5d is the assembly of the spring element 6th on the synchronizer ring 1 completed, the first spring leg 6a partially in the recess 8th on the rag 7th comes to rest, and wherein the second spring leg 6b opposite from the first spring leg 6a on the peripheral portion of the synchronizer ring 1 comes to the plant.

List of reference symbols

1

Synchronizer ring

2

Tooth element on the synchronizer ring

3

Sliding sleeve

4th

Toothed element on sliding sleeve

5

Socket carrier

6th

Spring element

6a-6d

Spring legs

7th

Rag

8th

Recess

9

Apex area

10

Recess

P

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QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102005054085 A1 [0004]
• DE 102012214025 A1 [0004]

Claims (7)

Synchronization device for a transmission, comprising at least one synchronizer ring (1) with toothed elements (2) on an outer peripheral surface, an axially movable sliding sleeve (3) with toothed elements (4) on an inner peripheral surface, a sleeve carrier (5) and at least one captive on the at least one Synchronizer ring (1) arranged spring element (6) for pre-synchronization between the sliding sleeve (3) and the at least one synchronizer ring (1), the spring element (6) formed in one piece from a sheet metal and at least positively on a tab (7) of the at least one synchronizer ring (1) is arranged. Synchronizing device according to Claim 1 , characterized in that the tab (7) of the at least one synchronizer ring (1) has a recess (8) for partially receiving the spring element (6) on a radially inwardly directed surface. Synchronizing device according to Claim 2 , characterized in that the recess (8) on the tab (7) has a slope in the radial direction. Synchronizing device according to one of the preceding claims, characterized in that the spring element (6) has a first and second integrally connected spring leg (6a, 6b), the first spring leg (6a) at least partially in the recess (8) on the tab (7 ) comes to rest, and the second spring leg (6b) comes to rest opposite the first spring leg (6a) on a peripheral section of the at least one synchronizer ring (1). Synchronizing device according to Claim 4 , characterized in that the spring element (6) has a third and fourth spring leg (6c, 6d), the third spring leg (6c) being integrally connected to the second spring leg (6b) and the fourth spring leg (6d) being integrally and angled with the third spring leg (6c) is connected, and wherein the sleeve carrier (5) is at least partially received between the third and fourth spring legs (6c, 6d). Synchronizing device according to Claim 5 , characterized in that an apex area (9) is arranged between the third and fourth spring legs (6c, 6d) in a recess (10) on an inner peripheral surface of the sliding sleeve (3). Synchronizing device according to one of the preceding claims, characterized in that the spring element (6) is designed to be pushed axially into the at least one synchronizing ring (1), the spring element (6) being at least partially elastically deformed.

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