Shifting assembly of transmission gear set of vehicle

Abstract

The invention relates to a shift arrangement of a transmission gear set of a vehicle, comprising an axially displaceable sliding sleeve for transmitting a torque between shift partners in order to achieve different gear ratios, the sliding sleeve and the shift partners embodied as gear wheels being arranged coaxially to an axis of rotation, the sliding sleeve has a first toothing region and a second toothing region for transmitting a torque between the shift partners, at least one shift partner having a sliding toothing region which can engage with one of the toothing regions of the sliding sleeve, and wherein the sliding sleeve has a first toothing region and a second toothing region for transmitting a torque between the shift partners, and wherein at least one of the shift partners has a second toothing region which can engage with one of the toothing regions of the sliding sleeve. At least a first toothing region and a second toothing region of the sliding sleeve are each designed as a shift toothing. The invention further relates to a transmission gear set having a shift arrangement.

Description

Technical Field

[0001] The invention relates to a shift assembly for a transmission gear set of a vehicle, which comprises an axially movable sliding sleeve for transmitting torque between shift partners to achieve different gear ratios. Background Art

[0002] Shifting assemblies for vehicle transmission gear sets are known from automotive technology. Each shifting assembly includes an axially displaceable sliding sleeve for establishing a torque-transmitting connection between shifting partners to achieve different gear ratios. To this end, the sliding sleeve has a first toothing region, which is a sliding toothing, and a second toothing region, which is a shifting toothing. The sliding toothing of the sliding sleeve can be axially displaced within the sliding toothing region of the first shifting partner between different shift positions, but the sliding toothing of the sliding sleeve always remains engaged with the sliding toothing region of the shifting partner. Depending on the shift position achieved in the sliding toothing region, the second toothing region of the sliding sleeve engages either with the shifting toothing of the shifting partner to achieve a first gear ratio or with the shifting toothing of another shifting partner to achieve a second gear ratio.

[0003] The sliding toothing of the sliding sleeve and the corresponding sliding toothing area of ​​the associated mating shift element have abutments for maintaining the shift position. These abutments form depressions in the tooth geometry, which are arranged on the tooth profile. This increases the backlash between the teeth of the sliding toothing. Due to the applied torque, the teeth of the mating shift element come into contact with the depressed tooth profile, and the resulting force serves to hold the sliding sleeve in the corresponding shift position. Summary of the Invention

[0004] The object of the present invention is to provide a shifting assembly and a transmission gear set having a shifting assembly, wherein the provided sliding toothing can also be used as a shifting toothing.

[0005] According to the invention, this object is achieved by the features of claim 1 or 10. Advantageous and claimed developments are apparent from the dependent claims and the description as well as the drawings.

[0006] Therefore, a shift assembly for a transmission gear set of a vehicle is proposed, which comprises an axially displaceable sliding sleeve for transmitting torque between shifting partners to achieve different gear ratios, wherein the sliding sleeve and the shifting partners, which are embodied as gearwheels, are arranged coaxially with respect to the rotation axis, wherein the sliding sleeve comprises a first toothing area and a second toothing area for transmitting torque between the shifting partners, wherein at least one shifting partner comprises a sliding toothing area which can engage with one of the toothing areas of the sliding sleeve, and wherein at least the first toothing area and the second toothing area of ​​the sliding sleeve are each embodied as shifting teeth.

[0007] In this way, the proposed shifting assembly combines the functions of a sliding tooth system and a shifting tooth system. Depending on the gear situation, the shifting assembly can be used as either a sliding tooth system or a pure shifting tooth system. This provides the proposed shifting assembly with the advantages of a sliding tooth system, such as ensuring or maintaining shift positioning, and also with the advantages of a shifting tooth system, such as improved engagement characteristics. Furthermore, the proposed shifting assembly can be advantageously used even when space is limited.

[0008] To enable the use of sliding and shifting toothing, it is provided that the teeth of the toothing region of the sliding sleeve each have at least one shifting edge or similar feature on the axial side, extending obliquely at a predetermined angle relative to the axis of rotation of the sliding sleeve. The curved shifting edge significantly improves the engagement characteristics. If the shift partner also has an obliquely extending shifting edge on its toothing, this leads to better centering of the sliding sleeve, particularly when the sliding sleeve is only partially supported.

[0009] The angle of the obliquely extending shift edge between the axis of rotation and the shift edge course is preferably an acute angle. The range of the predetermined angle lies within a value range between greater than 0° and less than 90°, wherein an average value range between the two specified limit values ​​is preferred.

[0010] In order to align the geometries at the different toothings, it is provided that the sliding toothing region at one of the shift partners of the sliding sleeve has at least one first shift position and a second shift position for the associated toothing region of the sliding sleeve, wherein at least one shifting edge or the like is provided at least at or in the region of the shift position, extending obliquely at a predetermined angle to the axis of rotation. The predetermined angle B has a value within a range of values ​​between greater than 0° and less than 90°.

[0011] The proposed shifting arrangement makes it possible for the sliding sleeve to engage with its first toothing region in the first or second shift position of the sliding toothing region of a mating shift element, and for the sliding sleeve to engage with its second toothing region in the shifting toothing of another mating shift element. In this case, the first toothing region functions, in a sense, as a sliding toothing, and the second toothing region of the sliding sleeve functions as a shifting toothing.

[0012] It is also conceivable that the sliding sleeve engages with the first toothing area with the shifting toothing of the shift partner and that the sliding sleeve engages with the second toothing area with the shifting toothing of another shift partner.

[0013] The object of the present invention is also achieved by a transmission gear set having the above-described shifting arrangement, wherein the already described and further advantages result. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with the aid of the accompanying drawings.

[0015] Figure 1 A schematic cross-sectional view shows an embodiment variant of a shifting assembly according to the invention, comprising a first toothing region of a sliding sleeve that engages in a first shifting position of a sliding toothing region of a first mating shift element, and a second toothing region of the sliding sleeve that engages with a shifting toothing of a second mating shift element for achieving a first gear ratio in a transmission gear set of a vehicle;

[0016] Figure 2 A schematic cross-sectional view of a shifting assembly is shown, which has a first toothing region of a sliding sleeve that engages in a second shift position of a first mating shift element and a second toothing region of the sliding sleeve that engages with the shifting toothing of a third mating shift element for achieving a second gear ratio; and

[0017] Figure 3 A schematic cross-section of a shifting assembly is shown, which has a first toothing region of the sliding sleeve that engages with the shifting teeth of the fourth mating shift element and a second toothing region of the sliding sleeve that engages with the shifting teeth of the fifth mating shift element for realizing a third gear ratio. DETAILED DESCRIPTION

[0018] exist Figures 1 to 3 Schematically, different cross-sections are shown in the circumferential direction, somewhat through a sliding sleeve 0 and corresponding toothings of associated shifting partners 1 , 2 , 3 , 4 , 5 of a shifting assembly according to the invention in a transmission gear set 8 of a vehicle.

[0019] The sliding sleeve 0 is axially displaceable and has an internal toothing with a first toothing area 6 and a second toothing area 7. To transmit torque between the mating shift elements 1, 2, 3, 4, 5, the sliding sleeve 0 is axially displaced. Thus, in the embodiment shown, for example, three different gear ratios can be achieved using five mating shift elements 1, 2, 3, 4, 5. The sliding sleeve 0 and the mating shift elements 1, 2, 3, 4, 5, which are designed as gearwheels, are arranged coaxially alongside one another to form a common axis of rotation 9.

[0020] In the illustrated embodiment variant of the shift assembly, the first shift partner 1 has a sliding toothing area with a first shift position 10 and a second shift position 11 for the first toothing area 6 of the sliding sleeve 0. The shift positions 10, 11 have a mount for holding or retaining the sliding sleeve 0 in the respective shift position 10, 11.

[0021] In order to realize sliding toothing and shifting toothing on the sliding sleeve 0 in the proposed shifting arrangement, it is provided that at least the first toothing region 6 and the second toothing region 7 of the sliding sleeve 0 are each designed as shifting toothing.

[0022] For this purpose, the teeth of the shift toothing of the toothing areas 6, 7 of the sliding sleeve 0 are each provided on the axial side with a shift edge 12 which extends obliquely at a predetermined angle A relative to the rotation axis 9 of the sliding sleeve 0. The predetermined angle A is designed as an acute angle and, in the embodiment variant shown, has a value in the average range between greater than 0° and less than 90° and is approximately 45°, which is particularly important in Figure 1 is shown in .

[0023] As from Figures 1 to 3 As can be seen, the toothing areas 6, 7 of the sliding sleeve 0 are each designed as an internal toothing, wherein the shifting edges 12 arranged on the teeth of the internal toothing on the axial side respectively extend from the tooth root to the tooth tip at a predetermined angle A, so that the shifting edges on both axial sides of each tooth of the shifting toothing run towards each other in a cross section or in a section in the circumferential direction, which is for example Figures 1 to 3 is shown in .

[0024] Furthermore, the sliding toothing region of the sliding sleeve 0 on the first shift partner 1 also has shift edges 13 in the region of the seating or in the shift position, which extend obliquely at a predetermined angle B relative to the rotation axis 9 . The value of the predetermined angle B lies within the same value range as the predetermined angle A.

[0025] Figure 1The shifting arrangement is shown in a state in which the first gear ratio is achieved by means of the sliding sleeve 0, wherein the sliding sleeve 0 connects the first mating shift element 1 to the second mating shift element 2. The first toothing area 6 of the sliding sleeve 0 engages with the sliding toothing area at the first shift position 10, while the second toothing area 7 of the sliding sleeve 0 engages with the shifting toothing of the second mating shift element 2.

[0026] In order to axially move the sliding sleeve 0 from this position into the second shift position 11 of the sliding toothing area of ​​the first shift partner 1 , the sliding toothing area also has an obliquely extending shifting edge 13 in the region of the shift positions 10 , 11 .

[0027] Figure 2 The shifting arrangement is shown in a state in which the second gear ratio is achieved by means of the sliding sleeve 0 , wherein the sliding sleeve 0 connects the first mating shift element 1 to the third mating shift element 3 for torque transmission. The first toothing area 6 of the sliding sleeve 0 engages with the sliding toothing area at the second shift position 11 , while the second toothing area 7 of the sliding sleeve 0 engages with the shifting toothing of the third mating shift element 3 .

[0028] Figure 3 The shifting arrangement is shown in a state in which the third gear ratio is achieved by means of the sliding sleeve 0, wherein the sliding sleeve 0 connects the fourth mating shift element 4 to the fifth mating shift element 5. To this end, it is necessary to disengage the sliding sleeve 0 from the sliding toothing region of the first mating shift element 1 in order to achieve the third gear ratio with the fourth mating shift element 4 and the fifth mating shift element 5 independently of the first mating shift element 1.

[0029] In order to be able to shift from the third gear ratio to the first gear ratio or the second gear ratio again, it is necessary to engage the sliding sleeve 0 again in the sliding toothing area of ​​the first shifting partner 1. For engagement and disengagement, an obliquely extending shifting edge 13 is also provided at the beginning of the sliding toothing area at the second shifting location of the first shifting partner 1 and at the other areas of the shifting locations 10, 11, preferably in the area of ​​the seating.

[0030] Reference Signs List

[0031] 0Sliding sleeve

[0032] 1First gear shift partner

[0033] 2 Second gear shift matching part

[0034] 3Third gear shift matching parts

[0035] 4Fourth gear shift matching parts

[0036] 5Fifth gear shift matching parts

[0037] 6 First tooth area of ​​the sliding sleeve

[0038] 7 Second toothed area of ​​the sliding sleeve

[0039] 8 transmission gear sets

[0040] 9 rotation axis

[0041] 10 First shift positioning at the first shift partner

[0042] 11 Second shift position at the first shift partner

[0043] 12 Shifting edge in the toothing area of ​​the sliding sleeve

[0044] 13 Shift edge at the first shift partner

[0045] A Predetermined angle of the shift edge at the sliding sleeve

[0046] B Predetermined angle at the first shift partner

Claims

1. A shift assembly of a transmission gear set (8) of a vehicle, the shift assembly comprising an axially movable sliding sleeve (0) for transmitting torque between shifting partners (1, 2, 3, 4, 5) to achieve different gear ratios, wherein: The sliding sleeve (0) and the shifting mating parts (1, 2, 3, 4, 5) implemented as gear stages are arranged coaxially with respect to a rotation axis (9), wherein the sliding sleeve (0) has a first toothing area (6) and a second toothing area (7) for transmitting torque between the shifting mating parts (1, 2, 3, 4, 5), wherein at least one shifting mating part (1) has a sliding toothing area which can be engaged with one of the toothing areas (6, 7) of the sliding sleeve (0), and wherein at least the first toothing area (6) and the second toothing area (7) of the sliding sleeve (0) are each implemented as a shifting toothing.

2. The shift assembly according to claim 1, characterized in that: The teeth of the shifting toothing of the toothing region (6, 7) of the sliding sleeve (0) each have at least one shifting edge (12) on the axial side, which extends obliquely at a predetermined angle (A) relative to the rotation axis (9) of the sliding sleeve (0).

3. The shift assembly according to claim 2, characterized in that: The predetermined angle (A) is implemented as an acute angle.

4. The shift assembly according to claim 2 or 3, characterized in that: The value of the predetermined angle (A) is within a range of values ​​greater than 0° and less than 90°.

5. The shift assembly according to any one of claims 2 to 4, characterized in that: The sliding sleeve (0) has an internal toothing as a toothing area (6, 7), wherein a shifting edge (12) arranged on the axial side on each tooth of the internal toothing extends from the tooth root to the tooth tip at a predetermined angle (A) so that the shifting edges on the two axial sides of each tooth face each other in cross section.

6. A gearshift assembly according to any one of the preceding claims, characterized in that A sliding toothing area at one of the shifting mating parts (1) has at least one first shifting position (10) and a second shifting position (11) for an associated toothing area of ​​a sliding sleeve (0), wherein at least one shifting edge (13) extending obliquely at a predetermined angle (B) relative to the rotation axis (9) is provided in each of the shifting positions (10, 11).

7. The shift assembly according to claim 6, characterized in that: The value of the predetermined angle (B) is within a range of values ​​greater than 0° and less than 90°.

8. The shift assembly according to claim 6 or 7, characterized in that: The sliding sleeve (0) engages with a first shift position (10) or a second shift position (11) of a sliding tooth region of a shift partner (1) using a first tooth region (6), and the sliding sleeve (0) engages with a shift tooth region of another shift partner (2, 3, 4, 5) using a second tooth region (7).

9. A gearshift assembly according to any one of the preceding claims, characterized in that The sliding sleeve (0) engages with the shifting teeth of a shifting partner (2, 3, 4, 5) by means of a first toothing area (6), and the sliding sleeve (0) engages with the shifting teeth of another shifting partner (2, 3, 4, 5) by means of a second toothing area (7).

10. A transmission gear set (8) having a shift assembly according to any one of the preceding claims.

Images