Parking lock system for motor vehicles

Abstract

The present invention relates to a parking lock system (10) for a motor vehicle, comprising a parking lock housing (14) which can be mounted on a transmission case (12), a pawl (16) which is mounted on the parking lock housing (14) in a manner that allows it to rotate around a rotation axis (20), a shift lever (28) which is mounted on the parking lock housing (14) in a manner that allows it to move in an operating direction (32), and an operating member (30) which is mounted on the shift lever (28), wherein the rotation axis (20) is arranged parallel to the operating direction (32).

Description

Technical Field

[0001] The invention relates to a parking lock system for a motor vehicle. Background Art

[0002] Parking lock systems for motor vehicles are known from DE 10 2011 086 238 A1, DE 10 2018 130 315 A1, DE 10 2018 003 751 A1 and DE 10 2015 014 937 A1, in which not only a pawl but also a shift lever provided for operating the pawl is mounted on a parking lock housing which is constructed separately from a transmission housing.

[0003] Furthermore, parking lock systems are known from WO 2017 / 211386 A1, DE 10 2004 037982 A1 and DE 10 2010 061171 A1, in which the parking lock housing also has a plate, wherein the flat area of ​​the plate is arranged perpendicular to the operating direction and wherein a pawl pin is installed in the plate for mounting the pawl. Summary of the invention

[0004] The object of the present invention is to provide a low-cost, compact, easy-to-install and safe parking lock system, which is achieved by the parking lock system and the transmission according to the present invention.

[0005] The present invention is based on a parking lock system for a motor vehicle, which has a parking lock housing that can be mounted on a transmission case, a pawl that can be rotatably mounted on the parking lock housing around a rotation axis, a shift lever that can be movably mounted on the parking lock housing in an operating direction, an operating member mounted on the shift lever, and a hydraulic piston cylinder unit.

[0006] It is also assumed that the parking lock housing has a cylinder bore of a hydraulic piston-cylinder unit, wherein the cylinder bore is arranged coaxially with respect to the shift lever, wherein the axis of rotation of the pawl is arranged parallel to the actuation direction.

[0007] It is also assumed that the parking lock housing has an at least partially flat plate, wherein the flat region of the plate is arranged perpendicular to the actuation direction and wherein a pawl pin is mounted in the plate for mounting the pawl.

[0008] It is furthermore assumed that the pawl is arranged behind the plate, viewed in the actuating direction.

[0009] This plate can fulfill several functions. Firstly, this plate can be advantageously used to fix the parking lock housing to the transmission case, and secondly, the pawl can be mounted on the plate in a simple manner.

[0010] According to the present invention, a hydraulic piston-cylinder unit is provided for moving the shift rod in an operating direction, wherein the parking lock housing has an operating housing which is integrally formed with a plate and is designed in the form of a casting, wherein the operating housing has a cylinder bore of the hydraulic piston-cylinder unit which is arranged coaxially with the shift rod, wherein a piston of the piston-cylinder unit is arranged within the cylinder bore, wherein a stop rod is provided which is arranged in the area of ​​the hydraulic piston-cylinder unit with respect to the operating direction and which is pivotally mounted on the operating housing, wherein the pivot plane of the stop rod is arranged perpendicular to the axis of rotation.

[0011] By the present invention, a compact, low-cost and easy-to-install parking lock system is provided, wherein many components are mounted on a parking lock housing which is formed separately from the transmission housing. In addition, in this way, the locking rod is arranged on the parking lock housing in a space-saving and functionally advantageous manner.

[0012] Advantageously, the locking rod is used to fix the piston of the piston-cylinder unit in a defined position in the operating direction. Advantageously, the piston has a recess for this purpose, into which the locking rod can engage for fixing.

[0013] Advantageously, the locking lever is designed as a substantially flat plate element which is arranged parallel to the plate.

[0014] The hydraulic piston-cylinder unit advantageously operates in the actuating device. The piston of the piston-cylinder unit advantageously is operatively connected to the shift lever.

[0015] Particularly advantageously, the cylinder of the hydraulic piston-cylinder unit is designed in this case in one piece with the parking lock housing.

[0016] A "parking lock system" should be understood to mean a system which is arranged to lock a motor vehicle transmission, in particular an automatic transmission, in the engaged state, so that at least one output shaft of the motor vehicle transmission is locked and the motor vehicle is locked in the parked state and cannot be driven away. In the disengaged / disengaged state, the parking lock system is arranged to unlock the motor vehicle transmission. The motor vehicle transmission preferably has a parking lock gear for this purpose. A "parking lock gear" should be understood here to mean a gear which has a tooth structure on its circumference which is arranged to engage with a pawl. The pawl is preferably arranged to fix the parking lock gear in a manner fixed to the housing in the engaged state of the parking lock system. A "pawl" should be understood here to mean an element which can be rotated between two working positions, which has at least one retaining tooth which is configured to correspond to the tooth structure of the parking lock gear and is arranged to mesh with the tooth structure of the parking lock gear in a form-fitting manner for engaging the parking lock. Preferably, the pawl engages with the parking lock gear in a first working position. In the engaged state, the pawl is in the first working position. Preferably, the pawl is disengaged from the parking lock gear in the second working position. In the disengaged state, the pawl is in the second working position.

[0017] The pawl is preferably actuated by the operating element. An "operating element" should be understood to mean in particular a form-fitting element which is provided for moving the pawl between at least two operating positions. Preferably, the operating element is designed as a conical element which is provided for moving, in particular rotating, the pawl by means of its conical surface in a direction which is particularly preferably orthogonal to the operating direction by an axial displacement in the operating direction.

[0018] The expression “seen in the actuation direction” refers to a viewing direction parallel to the axis of rotation of the pawl and in the direction in which the shift lever is moved in order to engage the pawl.

[0019] A first refinement provides that the compression spring, which is at least partially accommodated in the parking lock housing, is arranged coaxially with respect to the shift lever in such a way that the spring force of the compression spring is applied to the shift lever in the actuation direction, wherein the end of the compression spring facing away from the pawl, the plate and the pawl are arranged in this order as viewed in the actuation direction. With this arrangement, a high degree of compactness of the parking lock system can be achieved.

[0020] Particularly advantageously, the compression spring acts directly on the piston and indirectly on the gear lever via the piston.

[0021] Advantageously, the cylinder of the piston-cylinder unit is part of a cylinder bore, wherein not only the piston but also the shift rod and the compression spring are arranged in the cylinder bore.

[0022] An improved solution of the present invention provides that at least one oil supply point is provided in the flat area. In this way, a corresponding oil channel provided in the transmission case can be advantageously connected to the oil supply point, at which the flat area of ​​the plate is brought into contact with another corresponding flat area of ​​the transmission case.

[0023] Another development of the invention provides that three mounting locations are provided in the plate, wherein the three mounting locations define a triangle within which the flat region is at least partially arranged. By means of at least three mounting locations and their arrangement according to the invention, the plate can simultaneously fulfill several functions: it serves to hold the pawl, but also serves as an oiling location, wherein the three mounting locations provide for the required surface compression so that the oiling location can be sealed in the state mounted on the transmission housing.

[0024] Another improvement of the present invention provides that the pawl has a certain geometry, i.e., the pawl has a claw tooth, a supporting part and an operating recess, wherein a first connecting straight line passing through the supporting part and the operating recess and a second connecting straight line passing through the supporting part and the claw tooth enclose an angle of at least 30°.

[0025] In this way, the shift lever and the piston-cylinder unit operatively connected thereto as well as the parking lock gearwheel of the motor vehicle transmission to be locked can be arranged in a compact manner overall. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further features and advantages are derived from the following description of the drawings, in which:

[0027] Figure 1 and Figure 2 The parking lock system according to the invention is shown in a first view.

[0028] Figure 3 The parking lock system is shown in a second view,

[0029] Figure 4 The parking lock system is shown in a third view. DETAILED DESCRIPTION

[0030] Figure 1 and Figure 2 The first view of FIG. 1 shows the parking lock system 10 in a view in the actuation direction 32 from a side on which a pawl 16 is seated on a plate 36 of the parking lock housing 14 .

[0031] Figure 3 The second illustration of FIG. 3 shows the parking lock system 10 from a perspective perpendicular to the actuation direction 32 .

[0032] Figure 4 The third view of FIG. 1 shows the parking lock system 10 from the rear side in the actuation direction 32 .

[0033] The parking lock housing 14 has a substantially flat plate 36 and an actuating housing 34 fixedly connected to the plate. Advantageously, the actuating housing 34 and the plate 36 are designed in one piece, in particular advantageously as a one-piece cast part.

[0034] The operating housing 34 has a cylinder bore 40, in which a piston 42 is arranged. The cylinder bore 40 and the piston 42 are each part of a hydraulic piston-cylinder unit 38. With the aid of the piston-cylinder unit 38, the lever 28, which is also arranged in the cylinder bore 40, can be moved in an operating direction 32. An operating member 30 is arranged at the end of the lever 28. The operating member 30 preferably has a conical shape and is preferably arranged coaxially with respect to the lever 28. The operating member 30 cooperates with the operating recess 26 in the pawl 16 in such a way that a movement of the operating member 30 in the operating direction 32 causes a pivoting movement of the pawl 16 in a first pivot plane 50.

[0035] Furthermore, a first compression spring 44 is arranged coaxially with the piston 42 , for the most part within the cylinder bore 40 . The piston 42 and thus the shift rod 28 can be moved in the actuation direction 32 by means of the first compression spring 44 .

[0036] Viewed in the direction of the rotational axis 20 of the pawl 16 , the actuating element 30 in the unactuated state of the pawl 16 at least partially overlaps the plate 36 in the axial direction or is arranged at least partially at the same height as the plate 36 in the axial direction.

[0037] The compression spring 44 has an end facing away from the pawl 16 and an end facing the pawl 16. The end of the compression spring 44 facing away from the pawl 16, the plate 36 and the pawl 16 are arranged in sequence in the operating direction 32.

[0038] The latch 16 and the plate 36 are advantageously of substantially flat design, thereby simplifying production, and they are advantageously arranged parallel to one another.

[0039] The locking lever 48 is mounted on the operating housing 34 so as to be pivotable about the pivot axis 52 in the second pivot plane 76. By means of the locking lever 48, the piston 42 can be fixed in a position corresponding to the hydraulically unengaged pawl 16. The locking lever is actuated by means of an electromechanical actuator 78.

[0040] The locking lever 48 , the plate 36 and the pawl 16 are arranged one behind the other, viewed in the actuation direction 32 .

[0041] The electromechanical actuator 78 is advantageously fastened to the operating housing 34 . A further operating direction 80 of the electromechanical actuator 78 is arranged perpendicular to the operating direction 32 .

[0042] Advantageously, the first compression spring 44 , the locking lever 48 and the plate are arranged in sequence on the operating housing 34 , as viewed in the operating direction.

[0043] The pawl 16 is mounted on the plate 36 by means of a pawl pin 18 so as to be rotatable about an axis of rotation 20. For this purpose, the pawl 16 has a bearing 17. The axis of rotation 20 is arranged parallel to the actuation direction 32. The pawl pin 18 is advantageously arranged in a hole in the plate 36 of the parking lock housing 14.

[0044] Particularly advantageously, the pawl pin 18 projects beyond the pawl 16 on the side of the pawl 16 facing away from the plate 36, wherein the pawl pin 18 is mounted in a receptacle 82 at the transmission housing 12 on the side of the pawl 16 facing away from the plate 36. The receptacle 82 is designed, for example, as a blind hole or a hole in the transmission housing 12. Figure 3 The transmission case 12 and the receptacle 82 are schematically shown.

[0045] By means of the two-sided support of the pawl 16 or the pawl pin 18 , a very stable and permanent mounting of the pawl 16 is achieved.

[0046] Viewed in the direction of the axis of rotation 20 , the plate 36 , the pawl 16 and the receptacle 82 are arranged one behind the other.

[0047] Advantageously, there is only a small gap between the pawl 16 and the plate 36 in the area around the pawl pin 18. Likewise, there is only a small gap between the pawl 16 and the transmission case 12 around the pawl pin 18. "Small gap" advantageously refers to a gap of less than 5 mm, particularly advantageously less than 3 mm.

[0048] The parking lock housing 14 is mounted on a transmission housing 12, which is only schematically shown, of a transmission 11 of a motor vehicle by means of a first mounting location 64, a second mounting location 66 and a third mounting location 68. In addition, only one parking lock gear 24 of the transmission is shown, which is connected in a known manner in a rotationally fixed manner to a shaft, not further shown, of the transmission 11.

[0049] The special geometry of the pawl 16 also contributes to the advantageous overall concept of the parking lock system 10. Advantageously, the claw 22 of the pawl 16, the bearing 17 arranged coaxially with respect to the axis of rotation 20, and the actuating recess 26 are arranged such that a first connecting straight line 54 through the bearing 17 and the actuating recess 26 and a second connecting straight line 56 through the bearing 17 and the claw 22 enclose an angle 58 of at least 30°. The pawl 16 thus has a triangular shape in a certain sense, which in itself is a disadvantage due to the greater weight compared to known “elongated” pawls, but is advantageous in the overall system of the parking lock system 10.

[0050] The distance 60 between the bearing point 17 and the actuating recess 26 is advantageously 80% to 120% of the second distance 62 between the bearing point 17 and the claw 22 .

[0051] The bearing point 17 , the actuating recess 26 and the claw 22 are therefore arranged almost in the form of an isosceles triangle. Particularly advantageously, the bearing point 17 , the actuating recess 26 and the claw 22 are arranged in the form of a substantially equilateral triangle.

[0052] In order to fix the parking lock system 10 on the transmission case 12, the parking lock housing 14 has a first mounting location 64, a second mounting location 66 and a third mounting location 68. The mounting locations 64, 66, 68 are designed as holes in the embodiment, so that the fixing is achieved in other corresponding holes not shown in the transmission case 12 by means of bolts not shown.

[0053] The mounting locations 64, 66, 68 are arranged at intervals from each other in the plate 36. The plate 36 also has a flat region 74, in which the first oil supply location 70 and the second oil supply location 72 are arranged. The two oil supply locations 70, 72 are openings of oil channels extending in the parking lock housing 14 and used to supply oil to the hydraulic piston cylinder unit.

[0054] The mounting parts 64, 66, 68 are advantageously arranged in another triangular form, wherein the oil supply parts 70, 72 are arranged within or at least close to the other triangle. Through the at least three mounting parts 64, 66, 68, the required surface pressure can be provided for sealing the oil supply parts 70, 72.

[0055] Reference numerals list

[0056] 10 Parking lock system

[0057] 11 Transmission

[0058] 12 Transmission case

[0059] 14 Parking lock housing

[0060] 16 Pawl

[0061] 17 Supporting parts

[0062] 18 Pawl pin

[0063] 20 Rotation axis

[0064] 22 Claws

[0065] 24 Parking lock gear

[0066] 26 Operating recess

[0067] 28 gear lever

[0068] 30 Operating parts

[0069] 32 Operation direction

[0070] 34 Operation housing

[0071] 36 Plates

[0072] 38 Piston cylinder unit

[0073] 40 cylinder bore

[0074] 42 Piston

[0075] 44 First compression spring

[0076] 48 Stop rod

[0077] 50 first pivot plane

[0078] 52 Pivot axis

[0079] 54 First connecting straight line

[0080] 56 Second connecting straight line

[0081] 58 Angle

[0082] 60 First Distance

[0083] 62 Second Distance

[0084] 64 First installation location

[0085] 66 Second installation position

[0086] 68 Third installation position

[0087] 70 First oil supply point

[0088] 72 Second oil supply position

[0089] 74 Flat Area

[0090] 76 Second pivot plane

[0091] 78 Electromechanical Actuator

[0092] 80 Another operating direction

[0093] 82 Seats

Claims

1. A parking lock system (10) for a motor vehicle, comprising a parking lock housing (14) which can be mounted on a transmission case (12), a pawl (16) mounted on the parking lock housing (14) in a manner that allows it to rotate about a rotation axis (20), a shift lever (28) mounted on the parking lock housing (14) in a manner that allows it to move in an operating direction (32), and an operating member (30) mounted on the shift lever (28), wherein: The rotation axis (20) is arranged parallel to the operating direction (32), wherein the parking lock housing (14) has a plate (36), wherein a flat area (74) of the plate (36) is arranged perpendicular to the operating direction (32), and wherein a pawl pin (18) is mounted in the plate (36) for mounting a pawl (16), wherein the pawl (16) is arranged behind the plate (36) when viewed in the operating direction (32), Its characteristics are: A hydraulic piston-cylinder unit (38) is provided for moving a shift rod (28) in an operating direction (32), wherein the parking lock housing (14) has an operating housing (34) which is integral with a plate (36) and is formed in the form of a cast part, wherein the operating housing (34) has a cylinder bore (40) of the hydraulic piston-cylinder unit (38) which is arranged coaxially with the shift rod (28), wherein a piston (42) of the piston-cylinder unit (38) is arranged within the cylinder bore (40), wherein a stop rod (48) is provided which is arranged in the area of ​​the hydraulic piston-cylinder unit (38) with respect to the operating direction (32) and is mounted on the operating housing (34) in a pivotable manner, wherein a pivot plane (76) of the stop rod (48) is arranged perpendicular to the axis of rotation (20), and wherein the stop rod (48) is arranged in a manner such that the stop rod (48) can be pivoted. In the invention, the transmission case (12) has a receptacle (82) in which a pawl pin (18) is installed, wherein, viewed in the operating direction (32), the plate (36), the pawl (16) and the receptacle (82) are arranged in sequence, and three mounting positions (64; 66; 68) are provided within the plate (36), wherein the three mounting positions (64; 66; 68) define a triangle, and the flat area (74) is at least partially arranged within the triangle, and at least one oil supply position (70; 72) is provided within the flat area (74), wherein the transmission case (12) has an oil passage, and wherein the flat area (74) is arranged on the transmission case (12) in such a way that the oil passage is connected to the oil supply position (70; 72).

2. The parking lock system (10) according to claim 1, characterized in that: It includes a compression spring (44) at least partially arranged within the parking lock housing (14), and the compression spring is coaxially arranged with respect to the shift rod (28) so that the spring force of the compression spring (44) is applied to the shift rod (28) in the operating direction (32), wherein the end of the compression spring (44) facing away from the pawl (16), the plate (36) and the pawl (16) are arranged in sequence in the operating direction (32).

3. The parking lock system (10) according to claim 1 or 2, characterized in that: The actuating element (30) is arranged at least partially overlapping with respect to the plate (36) in the axial direction in the non-actuated state of the pawl (16), as viewed in the direction of the rotation axis (20) of the pawl (16).

4. The parking lock system (10) according to claim 1 or 2, characterized in that: Viewed in the operating direction (32), the locking lever (48), the plate (36) and the pawl (16) are arranged in sequence.

5. The parking lock system (10) according to claim 1 or 2, characterized in that: The pawl (16) has a claw tooth (22), a supporting part (17) and an operating recess (26), wherein a first connecting straight line (54) passing through the supporting part (17) and the operating recess (26) and a second connecting straight line (56) passing through the supporting part (17) and the claw tooth (22) enclose an angle (58) of at least 30°.

6. The parking lock system (10) according to claim 5, characterized in that: A first distance (60) between the bearing point (17) and the actuating recess (26) is 80% to 120% of a second distance (62) between the bearing point (17) and the claw (22).

7. A transmission (11) having a transmission housing (12), a parking lock gear (24) and a parking lock system (10) according to one of the preceding claims, characterized in that: The transmission case (12) has a receptacle (82) in which a pawl pin (18) is mounted, wherein the plate (36), the pawl (16) and the receptacle (82) are arranged in sequence when viewed in the operating direction (32).

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