Transmission

Abstract

Transmission comprising a transmission housing, toothed parts, and at least one shaft, wherein a toothed part is arranged within the transmission housing and is rotationally rigidly connected to the shaft, wherein an adapter shaft of the transmission has a threaded portion which is screwed into a threaded bore of the shaft, wherein a measuring gear is rotationally rigidly connected to the adapter shaft and / or is plugged onto the adapter shaft.

Description

[0001] transmission

[0002] Description:

[0003] The invention relates to a gearbox.

[0004] It is generally known that the interior of a gearbox is at least partially filled with lubricating oil.

[0005] From DE 102013002049 A1, a sensor arrangement is known as the closest prior art.

[0006] From WO 2018 / 096071 A1, an arrangement for fixing an angle sensor is known.

[0007] From FR 2590989 A1, an arrangement for recording a speed is known.

[0008] A rotary encoder gear device is known from DE 102010029640 B4.

[0009] From DE 19543562 A1, an arrangement for non-contact detection of the rotation angle of a rotatable element is known.

[0010] From DE 102009041 989 A1 a system is known which receives a switching point when the encoder is in a static position.

[0011] The invention is based on the objective of monitoring the function of a gearbox.

[0012] According to the invention, the problem is solved in the transmission according to the features specified in claim 1.

[0013] Important features of the invention in the gearbox are that it comprises a gearbox housing, gear components and at least one shaft,

[0014] ISI \ EIDOPAT 11.12.2025 wherein a gear part is arranged inside the gearbox housing and is rotatably connected to the shaft,

[0015] wherein an adapter shaft of the gearbox has a threaded area, in particular an external threaded area, which is screwed into a threaded bore, in particular a centering bore, of the shaft,

[0016] wherein a measuring gear is rotatably connected to the adapter shaft and / or is mounted on the adapter shaft

[0017] in particular wherein the maximum outer diameter of the measuring gear is larger than the maximum outer diameter of the shaft to improve measuring accuracy or wherein the maximum outer diameter of the measuring gear is smaller than the maximum outer diameter of the shaft to save installation space.

[0018] A key advantage is that the shaft angle measurement can be performed outside the lubricated oil area. This allows for highly precise measurement with minimal additional effort. Furthermore, only a small axial installation space is required for angle measurement. Direct angle measurement at the gearbox enables functional monitoring of the gearbox.

[0019] In an advantageous embodiment, a cover is attached to the bearing cap, and the measuring gear is arranged and thus enclosed within the space enclosed by the cover and the bearing cap. It is advantageous that the cover is preferably attached to the bearing cap with screws, thus enabling simple and cost-effective mounting. The cover provides at least dust protection for the measuring gear, ensuring interference-free measurement. This is because the signal induced by the rotating gear passing the sensors is periodic at a constant shaft speed, with only a brief deviation from this periodic pattern occurring due to a reference mark. The sensor signals are evaluated by electronic control units.

[0020] In an advantageous embodiment, a shaft seal ring integrated into the mounting cover seals against the adapter shaft. It is advantageous that the sensor is located outside the oil-filled interior, particularly the oil chamber, and / or that the oil-filled interior is separated from the measuring gear.

[0021] In an advantageous embodiment, a first sensor is attached to the bearing cover by means of a first adjustment means.

[0022] A second sensor is attached to the bearing cap by means of a second adjustment device. The advantage of this design is that the sensors can be adjusted so that the rotating teeth of the measuring gear generate a periodic signal with a sufficiently large amplitude to achieve the desired angular resolution.

[0023] In an advantageous embodiment, the two sensors detect the rotating teeth of the measuring gear as they pass by them. It is advantageous that the sensors detect the material of each tooth, especially the tip of the tooth, and generate a sufficiently strong signal.

[0024] In an advantageous embodiment, the sensors are arranged and aligned such that the periodic signals from the sensors, generated during operation of the gearbox, are offset from each other, in particular by 90°, so that the sensors function like a sine / cosine encoder for angle detection. An advantage of this is that the direction of rotation can also be determined by the offset. Furthermore, at least one relative angular position can be derived from the signals.

[0025] In an advantageous embodiment, the measuring gear has a reference mark at a circumferential point, particularly on a tooth of the measuring gear's teeth, especially for determining a zero position. It is advantageous that the absolute angular position can be determined, since a relative determination to the zero position, particularly the angular zero position, is possible using the time-delayed generated signals. Importantly, the sensor signal thus contains not only the angular information but also the zero signal. In an advantageous embodiment, the measuring gear is an externally toothed spur gear. It is advantageous that simple manufacturing is possible and the number of teeth can be selected according to the desired resolution.

[0026] In an advantageous embodiment, an externally conical area of ​​the adapter shaft borders the threaded area of ​​the adapter shaft.

[0027] The internally tapered section of the shaft abuts the threaded bore of the shaft and rests against the externally tapered section. This design offers the advantage of very precise alignment of the adapter shaft and, consequently, of the measuring gear mounted on the adapter shaft.

[0028] In an advantageous embodiment, the space enclosed by the gearbox housing is at least partially filled with lubricating oil. It is advantageous that the measuring gear is located outside this space, which is at least partially filled with lubricating oil, thus ensuring undisturbed detection of the gear teeth.

[0029] In an advantageous embodiment, the measuring gear is surrounded by air and / or the area enclosed by the cover comprises the measuring gear and the sensors surrounded by air. An advantage of this is that dirt or dust cannot interfere with the detection of the measuring gear.

[0030] In an advantageous embodiment, the measuring gear is made of metal, in particular a ferromagnetic metal. An advantage of this is that the measuring gear is easy to manufacture.

[0031] In a preferred embodiment, the sensors are designed as GMR sensors. The advantage here is that cost-effective sensors can be used.

[0032] In a preferred design, the cover is manufactured as an injection-molded plastic part. This offers the advantage of simple and cost-effective production.

[0033] Alternatively, a sheet metal part can be used as a cover, so that large mechanical forces can be absorbed.

[0034] In an advantageous embodiment, the measuring gear is materially bonded to the adapter shaft. This design offers the advantage of simplified manufacturing. In another advantageous embodiment, the gearbox housing incorporates a first bearing and a second bearing for the rotatable mounting of the shaft. This design also offers the advantage of allowing the bearings and the meshing gear components to be lubricated with oil.

[0035] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to a schematic diagram:

[0036] Figure 1 schematically sketches the essential area of ​​a transmission according to the invention.

[0037] As shown in the figure, the gearbox has a one-piece or multi-piece gearbox housing 4 in which a first bearing 1 and a second bearing 2 are accommodated for the rotatable support of a shaft 3 of the gearbox.

[0038] Shaft 3 functions either as the input shaft of the gearbox, as the output shaft of the gearbox, or as the intermediate shaft of the gearbox.

[0039] The first axial end of the shaft 3 is covered by a bearing cap 5, which is mounted on the outside of the gearbox housing 4.

[0040] An adapter shaft 9 has a threaded area that is screwed into a centering bore of the shaft 3.

[0041] The adapter shaft 9 is aligned coaxially with the shaft 3 and protrudes through the bearing cover 5.

[0042] A measuring gear 8, serving as a measure, is mounted on the adapter shaft 9 and connected to it in a rotationally fixed manner.

[0043] A shaft seal 10, which is incorporated in the bearing cover 5, seals against the shaft 3.

[0044] The measuring gear 8 is not surrounded by lubricating oil, but by air. However, the other gear components of the transmission, which are enclosed by the transmission housing 4, are in contact with lubricating oil, since the interior of the transmission is at least partially filled with lubricating oil.

[0045] A first sensor 6 is attached to the bearing cap 5 via a first adjustment means, and a second sensor 11 is attached via a second adjustment means. Both sensors (6, 11) detect the teeth of the measuring gear 8 rotating past them, wherein the sensors (6, 11) are arranged and aligned such that the periodic signals of the sensors (6, 11) during operation of the gearbox are preferably offset from each other by 90°, in particular so that the sensors (6, 11) can be used for angle detection in the manner of a sine / cosine encoder.

[0046] A cover 7 is attached to the bearing cover 5 and houses the sensors (6, 11) and the measuring gear 8.

[0047] The measuring gear 8 has a reference mark, in particular on a tooth of the toothing of the measuring gear 8. In this way, a zero position of the shaft 3, in particular a reference circumferential angle position of the shaft 3, can be determined.

[0048] In this way, the angle detection of shaft 3 is made possible outside the interior of the gearbox, which is at least partially filled with lubricating oil.

[0049] The measuring gear 8 is preferably made of metal and / or the sensors (6, 11) are preferably designed as GMR sensors.

[0050] In further embodiments of the invention, the two sensors (6, 11) are designed as a single sensor assembly, wherein the relative position of the two sensors is determined with high precision during the manufacture of the sensor assembly, in particular corresponding to a tooth pitch. In this way, only a single adjustment means is necessary during assembly.

[0051] In further embodiments of the invention, the measuring gear is made of a plastic and the sensors (6, 11) are suitably designed for detecting the teeth of the measuring gear 8. Reference numeral list

[0052] First camp

[0053] 2 second camp

[0054] 3rd wave

[0055] 4 Gearbox housings

[0056] 5 bearing caps

[0057] 6 first sensor

[0058] 7 Cover

[0059] 8 Measuring gear, in particular measuring scale 9 Adapter shaft

[0060] 10 Shaft seal

[0061] II second sensor

Claims

Patent claims:

1. Gearbox, comprising a gearbox housing, gear components and at least one shaft, wherein a toothed part is arranged inside the gearbox housing and is rotatably connected to the shaft, characterized by the fact that an adapter shaft of the gearbox has a threaded area, in particular an external threaded area, which is screwed into a threaded bore, in particular a centering bore, of the shaft, wherein a measuring gear is non-rotatably connected to the adapter shaft and / or is mounted on the adapter shaft, 2. Gearbox according to claim 1, in particular wherein the maximum outer diameter of the measuring gear is larger than the maximum outer diameter of the shaft. characterized by the fact that a cover is attached to a bearing cap and the measuring gear is enclosed by the cover together with the bearing cap.

3. Transmission according to any of the preceding claims, characterized by the fact that A shaft seal ring, mounted in the cover, seals the adapter shaft.

4. Transmission according to any of the preceding claims, characterized by the fact that a first sensor is attached to the bearing cover by means of a first adjustment device, a second sensor is attached to the bearing cover by means of a second adjusting device. or that the two sensors are attached to the bearing cover as a sensor assembly by means of a It is attached with a basting agent.

5. Transmission according to any of the preceding claims, characterized by the fact that The two sensors detect the teeth of the measuring gear rotating past them.

6. Transmission according to any of the preceding claims, characterized by the fact that The sensors are arranged and aligned such that the periodic signals of the sensors during operation of the gearbox are offset from each other, in particular by 90°, and in particular so that the sensors function like a sine / cosine encoder for angle detection.

7. Gearbox according to one of the preceding claims, characterized by the fact that the measuring gear has a reference mark at a circumferential point, in particular on a tooth of the toothing of the measuring gear, especially for determining a zero position.

8. Transmission according to any of the preceding claims, characterized by the fact that the measuring gear is an externally toothed spur gear, and / or that an externally conical area of ​​the adapter shaft borders the threaded area of ​​the adapter shaft, wherein an internally conical area of ​​the shaft borders the threaded bore of the shaft and rests against the externally conical area.

9. Gearbox according to any of the preceding claims, characterized by the fact that the area enclosed by the gearbox housing is at least partially filled with lubricating oil.

10. Transmission according to any of the preceding claims, characterized by the fact that the measuring gear is surrounded by air and / or the area of ​​space enclosed by the cover contains the measuring gear and the sensors surrounded by air.

11. Transmission according to any of the preceding claims, characterized by the fact that The measuring gear is made of metal, in particular of a ferromagnetic metal.

12. Gearbox according to one of the preceding claims, characterized by the fact that the sensors are designed as GMR sensors.

13. Transmission according to any of the preceding claims, characterized by the fact that The cover is made of injection-molded plastic.

14. Transmission according to any of the preceding claims, characterized by the fact that the measuring gear is materially bonded to the adapter shaft.

15. Transmission according to any of the preceding claims, characterized by the fact that The gearbox housing contains a first bearing for the rotatable mounting of the shaft and a second bearing for the rotatable mounting of the shaft.

Images