GEARBOX WITH A HOUSING

Description

[0001] The invention relates to a transmission with a housing.

[0002] It is generally known that a gearbox has a housing in which bearings for the gearbox shafts are housed.

[0003] From DE 10 2020 002 395 A1 is a gearbox with a housing part is known.

[0004] From DE 10 2016 007 565 A1 a spin segment functional principle of a fluid-driven engine with spark ignition is known.

[0005] A gear pump is known from US 4 259 045 A.

[0006] A leakage prevention device in a gearbox is known from KR 10 1 933 118 B1.

[0007] A gearbox is known from CN 2 04 729 551 U.

[0008] A gearbox is also known from CN 2 02 195 000 U.

[0009] From the US 3 486 207 A The closest state of the art is a gearbox with a housing.

[0010] The invention is based on the object of producing a gearbox cost-effectively.

[0011] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0012] Important features of the invention in the transmission are that the transmission is designed with a housing, wherein the housing has a first housing part and a second housing part, wherein the first housing part is identical to the second housing part, in particular made of the same material and with the same geometric shape, in particular of the same type and of the same shape, wherein the first housing part is connected to the second housing part, in particular to form the housing, in particular wherein the housing is composed of the first and the second housing part.

[0013] The advantage is that only a single mold is required to produce the two housing parts, as they are identical. This keeps manufacturing costs low, even for small quantities of the gearbox.

[0014] In the invention, the first housing part has a first opening for the passage of a drive shaft, in particular a rotor shaft of an electric motor connected to the first housing part, which is connected in a rotationally fixed manner to a gearing part. It is advantageous that the housing part has a first opening through which the drive shaft protrudes.

[0015] According to the inventionThe first housing part has a second opening, which is sealed with a first closure cover, particularly from the environment. Advantageously, the second opening can be tightly closed with a closure cover. The closure cover is connected to the housing part by a force fit and pressed against the housing part in an oil-tight manner.

[0016] In an advantageous embodiment, an output shaft passes through the second opening of the second housing part, in particular, the output shaft being connected in a rotationally fixed manner to a geared part. Advantageously, the output shaft protrudes from the gear unit through the second opening. A shaft seal can also be provided for an oil-tight connection.

[0017] In an advantageous embodiment, the first opening of the second housing part is sealed with a second closure cover, particularly from the environment. It is advantageous that the first opening in the second housing part can be used differently or in a different way than in the first housing part.

[0018] In an advantageous embodiment, the first housing part has bores for receiving pins, in particular on its side facing the second housing part, The second housing part has bores for receiving the pins, particularly on its side facing the first housing part, in particular wherein each pin is partially inserted into one of the bores of the first housing part and also into one of the bores of the second housing part. Advantageously, the two housing parts can be positioned or centered relative to one another by means of the pins, and a high torque can be transmitted through the transmission.

[0019] In an advantageous embodiment, the first housing part has, at the second opening of the first housing part, an annular wall projecting radially inward relative to the axis of rotation of the output shaft, against which the first closure cover is positioned, in particular from the outside environment of the transmission, and against which a bearing of the output shaft of the transmission is positioned, in particular on the side of the annular wall facing away from the first closure cover and / or from the interior of the transmission. It is advantageous that a respective component can be positioned against the annular wall on both sides.

[0020] In an advantageous embodiment, the second housing part has, at the second opening of the second housing part, an annular wall projecting radially inward relative to the axis of rotation of the output shaft, against which a shaft sealing ring is positioned, in particular coming from the external environment of the transmission, and against which a bearing of the output shaft of the transmission is positioned, in particular on the side of the annular wall facing away from the first closure cover and / or coming from the interior of the transmission. It is advantageous that a respective component can be positioned axially against the annular wall on both sides.

[0021] In an advantageous embodiment, the annular wall is ring-shaped, particularly continuous in the circumferential direction. This is advantageous in that a high degree of tightness can be ensured.

[0022] According to the inventionthe second housing part has an intermediate wall section in the first opening, which narrows the first opening, in particular wherein the vertical projection of the first opening parallel to the axis of rotation of the input shaft is a circle and the vertical projection of the intermediate wall section parallel to the axis of rotation of the input shaft is at least partially bordered by a secant of the circle, wherein, in the second housing part, a closure cover is positioned against the intermediate wall section in the first opening, in particular wherein a bearing of an intermediate shaft is accommodated in the intermediate wall section. The advantage here is that a sufficiently high residual wall thickness, particularly in the radial direction, can be ensured for the bearing of an intermediate shaft accommodated in the intermediate wall section.

[0023] In an advantageous embodiment, axially directed through holes, in particular aligned parallel to the axis of rotation of the output shaft, are arranged in the first housing part on one side of a plane which contains the axis of rotation of the input shaft and the axis of rotation of the output shaft, wherein, in the second housing part, on the other side of this plane, there are boreholes that align with the respective through-bores when the two housing parts are connected, in particular designed as threaded holes for screwing in the threaded portion of the screws or designed as blind holes for cutting the self-tapping threaded portions of the screws, wherein the further screws protrude through the through-bores. The advantage here is that the two housing parts can be connected by means of the screws, in that after screwing in the threaded portions of the screws, the screw heads of the screws press the first housing part towards the second housing part.

[0024] In an advantageous embodiment, axially directed through holes, in particular aligned parallel to the axis of rotation of the output shaft, are arranged in the second housing part on one side of a plane which contains the axis of rotation of the input shaft and the axis of rotation of the output shaft, wherein in the first housing part, on the other side of this plane, boreholes are arranged which align with the respective through-bores when connecting the two housing parts, in particular designed as threaded bores for screwing in the threaded portion of further screws or designed as blind holes for cutting the self-tapping threaded portions of the further screws, wherein the further screws protrude through the through-bores. The advantage here is that the two housing parts can be additionally connected by means of the additional screws, in that after screwing in the threaded portions of the additional screws, the screw heads of the additional screws press the second housing part towards the first housing part.

[0025] In an advantageous embodiment, the first housing part has first threaded bores that have the same radial distance from the rotational axis of the input shaft and are preferably evenly spaced from one another in the circumferential direction, in particular for connecting an electric motor driving the transmission. It is advantageous that a further component or the housing, in particular a flange of the electric motor, can be connected to the housing part.

[0026] In an advantageous embodiment, the second housing part has second threaded bores that are at the same radial distance from the axis of rotation of the output shaft and are preferably evenly spaced from one another in the circumferential direction, in particular for connecting to a device driven by the gear unit. It is advantageous that the gear unit can be connected to a driven device.

[0027] In an advantageous embodiment, one of the first threaded holes also functions as one of the second threaded holes, In particular, the axis of this threaded bore is arranged on the plane containing the rotational axis of the input shaft and the rotational axis of the output shaft, in particular, the rotational axis of the input shaft being aligned parallel to the rotational axis of the output shaft. It is advantageous that this threaded bore can be used in the first housing part for connection to the motor housing and in the second housing part for connection to the device.

[0028] In an advantageous embodiment, the first and second housing parts are each manufactured as cast parts, particularly made of metal. This is advantageous because the same casting mold can be used for both housing parts, thus keeping manufacturing costs low even for small quantities of the gearbox.

[0029] Further advantages arise from the dependent claims. Further sensible combination possibilities of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to the skilled person, particularly from the problem and / or the problem posed by comparison with the prior art.

[0030] The invention will now be explained in more detail using schematic illustrations: In the Figure 1 is a housing according to the invention, which is composed of two housing parts 1, of a transmission shown in an oblique view. In the Figure 2 The gearbox is shown from a different angle. In the Figure 3 One of the housing parts 1 is shown in a sectional view. Figure 4 A sectional view of the gearbox is shown. Figure 5 The gearbox is shown exploded in an oblique view.

[0031] As shown in the figures, the two housing parts 1 are designed the same, in particular identical, and are connected to each other.

[0032] The first of the two housing parts 1 has a first through opening which is provided for the passage of a driving rotor shaft of an electric motor which can be connected to the housing.

[0033] This first opening is closed with a cover 7 in the second of the two housing parts 1. This cover 7 is pressed into the opening and thereby positively connected to the second housing part 1.

[0034] A second through opening of the first housing part 1 is connected to a further closure cover 8. This is preferably also pressed into the opening and is thereby connected to the first housing part 1 in a force-fitting manner.

[0035] However, this second opening is provided in the second housing part 1 for the passage of the output shaft 6.

[0036] A shaft sealing ring 5 is pressed into the second opening from the outside and positioned against an annular wall 30 projecting radially inwards towards the output shaft 6.

[0037] From the interior of the gearbox, a bearing 42 is accommodated in the second opening and is also positioned against the annular wall 30. In the other housing part 1, a bearing 40 is also accommodated in the second opening and is also positioned against the annular wall 30 there.

[0038] Both openings therefore function either to pass through a respective shaft or alternatively to accommodate a closure cover (7, 8).

[0039] Bearings are placed on an intermediate shaft 41, with one of the bearings being accommodated in each of the housing parts 1.

[0040] The opening provided for the electric motor is at least partially blocked by an intermediate wall section 9. This intermediate wall section 9 ensures a minimum wall thickness for bearings, in particular for bearings of the intermediate shaft 41. However, it represents an obstacle for a shaft that would have the diameter of the opening and would be inserted through the opening.

[0041] To connect the two housing parts 1, pins 50 are used, which are each inserted on the one hand into a blind hole made in a first of the two housing parts 1 and on the other hand into a blind hole made in the other of the two housing parts 1.

[0042] In addition, screws are inserted into through-holes 3 of the first housing part 1, with the screws 52 each being screwed into a threaded hole in the other housing part with their threaded portion. Alternatively, the threaded holes can also be designed as blind holes, and the threaded portions of the screws 52 can be designed as self-tapping or self-cutting, with the material of the screw 52 being selected to be harder than the material of the housing part 1, in particular with the housing part 1 being made of aluminum and the screw being made of a steel, in particular hardened steel.

[0043] Likewise, further screws 52 are inserted into through-holes 3 of the second housing part 1, wherein the screws 52 are each screwed with their threaded portion into a threaded hole of the other housing part. Alternatively, the threaded holes can also be designed as blind holes, and the threaded portions of the screws 52 can be designed as self-tapping or self-cutting, wherein for this purpose, the material of the further screws 52 is selected to be harder than the material of the second housing part 1, in particular wherein the second housing part 1 is made of aluminum and the further screw 52 is made of a steel, in particular hardened steel.

[0044] A flat seal 51 is arranged between the two housing parts 1 so that when the two housing parts 1 are pressed together, a tight housing is created.

[0045] Preferably, the through holes 3 are arranged on one side of a plane which contains the axis of rotation of the input shaft and the axis of rotation of the output shaft 6. On the other side of this plane, the boreholes which are aligned with the respective through holes 3 when the two housing parts 1 are connected are arranged, in particular designed as threaded holes for screwing in the threaded area of the screws 52 or designed as blind holes for cutting the self-tapping threaded areas of the screws 52.

[0046] The drill holes on the respective housing part 1 are arranged on the outer end face of the housing part, i.e. on the side facing away from the seal 51, in particular the flat seal.

[0047] The pins 50 and the screws 52 are axially guided through respective recesses of the flat seal 51.

[0048] The axial direction is parallel to the axis of rotation of the output shaft 6.

[0049] If the housing part 1 is made of cast iron or cast steel, the threaded holes for the screws 52 must be cut. This allows for a high torque to be transmitted.

[0050] The housing part 1 is made in another, easily manufactured design, preferably from aluminum, in order to be able to insert the self-tapping screws 52 mentioned.

[0051] In further embodiments of the invention, the housing part is made of die-cast zinc.

[0052] In further embodiments of the invention, iron or steel, in particular non-hardened steel, is used instead of aluminum. List of reference symbols

[0053] 1 Housing part 2 First blind hole 3 Through hole 4 Second blind hole 5 Shaft seal 6 Output shaft 7 Cover plate 8 Cover plate 9 Intermediate wall section 30 Ring wall 40 Bearing 41 Intermediate shaft 42 Bearing 50 Pin 51 Seal, in particular flat seal 52 Screw

Claims

1. A gear unit having a housing, wherein the housing has a first housing part (1) and a second housing part, wherein the first housing part (1) is identical to the second housing part, wherein the first housing part (1) is connected to the second housing part, characterised in that in a first opening in the second housing part, a sealing cover (7) is placed against a partition-wall portion (9), the gear unit has an input shaft, wherein the first housing part (1) has a first opening for the passage of the input shaft, wherein the first housing part (1) has a second opening which is sealed with respect to the environment by a first sealing cover (8), wherein the second housing part has the partition-wall portion (9) in the first opening, which partition-wall portion narrows the first opening, wherein the perpendicular projection of the first opening parallel to the rotational axis of the input shaft is a circle and the perpendicular projection of the partition-wall portion (9) parallel to the rotational axis of the input shaft is at least partially bounded by a secant of the circle, wherein in the first opening in the second housing part, a sealing cover (7) is placed against the partition-wall portion (9), wherein a bearing of an intermediate shaft (41) is received in the partition-wall portion (9).

2. A gear unit according to claim 1 or 2, characterised in that the input shaft is a rotor shaft, connected to a toothing part in a rotationally-fixed manner, of an electric motor connected to the first housing part (1).

3. A gear unit according to any one of the preceding claims, characterised in that an output shaft (6) is passed through the second opening of the second housing part, wherein the output shaft (6) is connected to a toothing part in a rotationally-fixed manner, wherein the output shaft (6) is passed through the second opening of the first housing part (1).

4. A gear unit according to any one of the preceding claims, characterised in that the first opening of the second housing part is sealed with respect to the environment by a second sealing cover (7).

5. A gear unit according to any one of the preceding claims, characterised in that the first housing part (1) has bores to receive pins (50), wherein the second housing part has bores to receive the pins (50).

6. A gear unit according to claim 3, characterised in that the first housing part (1) has, at the second opening of the first housing part (1), an annular wall (30) which projects radially inwards related to the rotational axis of the output shaft (6) and against which the first sealing cover (7) and a bearing of the output shaft (6) of the gear unit are placed.

7. A gear unit according to claim 3, characterised in that the second housing part has, at the second opening of the second housing part, an annular wall (30) which projects radially inwards related to the rotational axis of the output shaft (6) and against which a shaft sealing ring (5) and a bearing of the output shaft (6) of the gear unit are placed.

8. A gear unit according to claim 7, characterised in that the annular wall (30) is ring-shaped and uninterrupted in a circumferential direction.

9. A gear unit according to claim 3, characterised in that axially-directed through bores (3) are arranged in the first housing part (1), on one side of a plane which contains the rotational axis of the input shaft and the rotational axis of the output shaft (6), wherein in the second housing part, on the other side of this plane there are arranged borings which come into alignment with the respective through bores (3) upon connection of the two housing parts.

10. A gear unit according to claim 3, characterised in that axially-directed through bores (3) are arranged in the second housing part, on one side of a plane which contains the rotational axis of the input shaft and the rotational axis of the output shaft (6), wherein in the first housing part (1), on the other side of this plane there are arranged borings which come into alignment with the respective through bores (3) upon connection of the two housing parts.

11. A gear unit according to any one of the preceding claims, characterised in that the first housing part (1) has first tapped bores which are at the same radial distance from the rotational axis of the input shaft and are preferably uniformly spaced apart from one another in a circumferential direction.

12. A gear unit according to claim 3, characterised in that the second housing part has second tapped bores which are at the same radial distance from the rotational axis of the output shaft (6) and are preferably uniformly spaced apart from one another in a circumferential direction.

13. A gear unit according to claim 12, characterised in that one of the first tapped bores also acts as one of the second tapped bores.

14. A gear unit according to any one of the preceding claims, characterised in that the first and second housing part (1) are in each case manufactured as a cast part, in particular made of metal