Transmission having a case

Abstract

A transmission having a case, wherein: the interior of the transmission surrounded by the case is at least partially filled with oil; a block part is fastened to the case; an impeller around which oil can flow is rotatably mounted in the block part; and a sensor for detecting blades of the impeller is located in a first blind hole of the block part.

Description

[0001] Gearbox with a housing

[0002] Description:

[0003] The invention relates to a transmission with a housing.

[0004] It is well known that gearboxes generate waste heat and oil is used as a lubricant in gearboxes.

[0005] The closest state of the art is a gearbox known from CN 216 589 860 U.

[0006] A flow measuring device is known from DE 2629 766 A1.

[0007] A boat is known from CN 109 163 078 A.

[0008] A gearbox is known from DE 102005 053 772 A1.

[0009] A gearbox is known from DE 102007 004 964 A1.

[0010] A turbine flow meter is known from DE 1 473 142 B.

[0011] A flow sensor is known from DE 102005 045 995 A1.

[0012] A device for measuring the volume flow is known from DE 202008 008 797 U1.

[0013] A gearbox is known from GB 2 234 824 A.

[0014] A drive device is known from DE 102016 008 377 A1.

[0015] A transmission system is known from DE 102016 003 716 A1.

[0016] A sensor connector is known from US Pat. No. 6,425,293 B1. The invention is therefore based on the object of ensuring the safe operation of a transmission.

[0017] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0018] Important features of the invention in the gearbox with a housing are that the interior of the gearbox surrounded by the housing is at least partially filled with oil, wherein a block part is fastened to the housing, wherein an impeller around which oil flows is rotatably mounted in the block part, wherein a sensor for detecting blades of the impeller is arranged in a first blind hole of the block part.

[0019] The advantage here is that the speed of the impeller can be monitored using the sensor, thus ensuring safe operation. This is because waste heat is generated during operation of the gearbox, which must be dissipated to prevent critically high temperatures in the gearbox. The oil allows the heat to be efficiently transported out of the gearbox interior. The oil flow is monitored by monitoring the speed of the impeller, thus ensuring that the heat is dissipated. As soon as the oil flow stops, the gearbox must be put into a safe state. Because the sensor is located in a blind hole, it is safely separated from the oil and is still able to detect the passing blades of the impeller through the material of the block part, thus making the speed determinable.The impeller blade approaching the sensor is detected when it falls below a certain minimum distance, and a corresponding sensor signal is generated by the sensor. In this way, a sensor signal is generated as the nearest blade rotates past, and the impeller's speed can be determined from this.

[0020] In an advantageous embodiment, oil can be or is pumped from the interior of the gearbox through an oil pipeline to the impeller by means of an oil pump, in particular, the oil pumped to the impeller can be or is returned to the interior of the gearbox via additional pipelines. Advantageously, an oil circuit is available that dissipates the gearbox's heat losses. The sensor acts as a flow monitor via the impeller, thus monitoring the cooling function.

[0021] In an advantageous embodiment, an axle, in particular a fully cylindrical axle, is arranged in the block part in a rotationally fixed manner, onto which an inner ring of a bearing, in particular a roller bearing, is mounted, with the outer ring of the bearing being accommodated in the impeller. Advantageously, the impeller is rotatably mounted on the axle, thus allowing the sensor to detect the rotating vanes.

[0022] In an advantageous embodiment, at least the radial end regions of the blades of the impeller are made of metal, in particular a material that is detectable by the sensor. This is advantageous in that each blade is detectable, with the sensor even detecting the respective blade through the material of the block part.

[0023] In an advantageous embodiment, the sensor is an inductive proximity sensor or an eddy current sensor. This is advantageous in that the moving, particularly approaching, metallic material of the respective blade can be detected.

[0024] In an advantageous embodiment, the impeller is arranged in a first bore extending through the block part. Advantageously, an oil channel is formed through which the oil supplied via the oil pipeline flows, thus driving the impeller.

[0025] In an advantageous embodiment, a second bore in the block part opens into the first bore, in particular such that the block part functions as an oil distribution block. It is advantageous here that the block part functions as a distribution block. In an advantageous embodiment, an airfoil part is arranged axially in front of and behind the impeller, the outer radius of which increases monotonically with decreasing distance from the impeller. The advantage here is that the flow is as laminar as possible, thus in particular preventing or at least reducing turbulence. The airfoil part is not arranged to rotate with the impeller, but is connected to the block part in a rotationally fixed manner, in particular indirectly via the axis.

[0026] In an advantageous embodiment, the respective airfoil part is made of plastic, in particular as an injection-molded plastic part. This allows for simple, cost-effective production.

[0027] In an advantageous embodiment, the mathematical axis of the first blind hole intersects the impeller, in particular, the mathematical axis of the first blind hole being aligned perpendicular to the rotational axis of the impeller. This advantageously keeps the sensor away from the oil, in particular without the use of seals.

[0028] In an advantageous embodiment, a temperature sensor is arranged in a second blind hole of the block part, in particular with the second blind hole being spaced apart from the first. Advantageously, the temperature sensor is also protected from oil and determines the oil temperature through the material of the block part.

[0029] In an advantageous embodiment, the respective airfoil part is designed as a rotating body whose rotational symmetry axis is aligned coaxially with the rotational axis of the impeller. This advantageously creates a laminar flow, which is directed toward the impeller. No turbulence is generated by the airfoil parts when directing the air toward the impeller or away from the impeller. The airfoil parts are preferably streamlined.

[0030] In an advantageous embodiment, the distance between the oil and the sensor for detecting impeller vanes is smaller than the radius of the first blind hole. This is advantageous because the sensor detects the passing impeller vanes through the material of the block part and can thus be operated protected from oil.

[0031] In an advantageous embodiment, the distance between the oil and the temperature sensor is smaller than the radius of the second blind hole. This is advantageous because the temperature determined by the temperature sensor is essentially the same as the oil temperature.

[0032] In an advantageous embodiment, a connector is attached to the block part, to which the sensor lines of the temperature sensor and the sensor lines of the sensor for detecting impeller blades are routed and electrically connected. Advantageously, the sensor signals can be routed to an evaluation unit via a plug connection. This enables secure, quick, and easy connection.

[0033] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0034] The invention will now be explained in more detail using schematic illustrations:

[0035] Figure 1 shows a sectioned block part of a transmission according to the invention in an oblique view.

[0036] As shown in Figure 1, the transmission has a block part 1 in which an axle 2 is arranged.

[0037] The axis 2 extends through a first bore which is made in the block part 1.

[0038] At least a second bore opens into the first bore, so that block part 1 acts as a distributor for oil.

[0039] The axis 2 is connected to the block part 1 in a rotationally fixed manner.

[0040] An impeller 4 is rotatably mounted on the axis 2 in that a bearing, in particular an inner ring of the bearing, is pushed onto the axis 2 and the outer ring of the bearing is accommodated in the impeller 4.

[0041] Preferably, the impeller 4 is designed as a plastic injection-molded part.

[0042] Impeller 4 is arranged in the channel formed by the first bore, through which oil flows. Impeller 4 rotates depending on the flow velocity of the oil.

[0043] The first bore is preferably continuous through the block part 1.

[0044] The movement of the impeller 4 and thus the flow velocity of the oil in the channel can be detected with a sensor.

[0045] The sensor, together with the impeller 4, thus functions as a flow monitor. The sensor is located in a blind hole exposed from the environment and detects the impeller 4 through the material of the block part 1.

[0046] A flow profile part 3 is arranged axially in front of and behind the impeller, the outer radius of which increases monotonically with decreasing distance from the impeller 4.

[0047] The bore axis of the blind hole is preferably perpendicular to the bore axis of the first hole. The bore axis of the second hole is preferably perpendicular to the bore axis of the first hole, in particular and preferably perpendicular to the bore axis of the blind hole.

[0048] A metallic region, in particular a ferromagnetic region, is arranged on the respective blade of the impeller 4 at least at its radially outer end regions.

[0049] The sensor thus detects the passing of each blade. The sensor generates a pulse for each passing blade, and an evaluation unit evaluates the sensor signal. The evaluation unit preferably determines the time required for a number of such consecutive pulses equal to the number of blades on the impeller. The rotational speed can then be determined from this time, particularly as the reciprocal, and thus serves as a measure of the flow velocity.

[0050] The block part 1 is fastened to the housing of the gearbox, in particular by means of screws. A first oil line is connected to the first end of the first bore and a second oil line is connected to the second end of the bore. A third oil line is connected to the end of the second bore. Thus, the oil supplied through the first oil line is supplied by the distributor to the second oil line and the third oil line. The block part 1 therefore functions as an oil distributor. The first oil line is fed by an oil pump, which is designed as a shaft end pump and is driven by one of the shafts of the gearbox. The second oil line and the third oil line each lead into the interior of the gearbox and supply different points with oil, so that the gearbox is both lubricated and cooled.This is because the supplied oil preferably flows through an oil cooler or at least through an oil pipe attached to the outside of the transmission housing. As it flows through this oil pipe, heat is released from the oil to the environment, so that the oil pumped from the interior of the transmission reaches block part 1 at a reduced temperature after flowing through the oil pipe. The sensor can be implemented, for example, as an inductive proximity sensor or an eddy current sensor. Block part 1 is made of metal.

[0051] The impeller 4 preferably has metallic areas, at least on its radial outer edge, which are detectable by the sensor. The block part 1 is preferably made of steel or aluminum.

[0052] In further embodiments of the invention, a check valve is also accommodated in the first bore.

[0053] List of reference symbols

[0054] 1 block part 2 axle

[0055] 3 Flow profile part

[0056] 4 Impeller with bearing, especially rolling bearing

[0057] 5 Recess for sensor

Claims

Patent claims:

1. Gearbox with a housing, wherein the interior of the gearbox surrounded by the housing is at least partially filled with oil, characterized in that a block part, in particular an oil distribution block, is fastened to the housing, wherein an impeller around which oil flows is rotatably mounted in the block part, wherein a sensor for detecting blades of the impeller is arranged in a first blind hole of the block part.

2. Gearbox according to claim 1, characterized in that by means of an oil pump oil can be or is conveyed from the interior of the gearbox through an oil pipe to the impeller, in particular wherein the oil pipe is connected to the block part, in particular wherein the oil conveyed to the impeller can be or is returned to the interior of the gearbox via further pipes, in particular wherein the further pipes are each connected to the block part.

3. Gearbox according to one of the preceding claims, characterized in that an axle, in particular a fully cylindrical axle, is arranged in a rotationally fixed manner in the block part, onto which an inner ring of a bearing, in particular a rolling bearing, is placed, the outer ring of the bearing being received in the impeller.

4. Gearbox according to one of the preceding claims, characterized in that at least the radial end regions of the blades of the impeller are made of metal, in particular which is detectable by the sensor.

5. Transmission according to one of the preceding claims, characterized in that the sensor is an inductive proximity sensor or an eddy current sensor.

6. Gearbox according to one of the preceding claims, characterized in that the impeller is arranged in a first bore passing through the block part.

7. Transmission according to one of the preceding claims, characterized in that a second bore of the block part opens into the first bore, in particular in such a way that the block part functions as an oil distribution block.

8. Gearbox according to one of the preceding claims, characterized in that a flow profile part is arranged axially in front of and behind the impeller, the outer radius of which increases monotonically with decreasing distance from the impeller.

9. Gearbox according to one of the preceding claims, characterized in that the respective flow profile part is made of plastic, in particular as a plastic injection-molded part.

10. Gearbox according to one of the preceding claims, characterized in that the mathematical bore axis of the first blind hole intersects the impeller, in particular wherein the mathematical bore axis of the first blind hole is aligned perpendicular to the axis of rotation of the impeller.

11. Transmission according to one of the preceding claims, characterized in that a temperature sensor is arranged in a second blind hole of the block part, in particular wherein the second blind hole is spaced from the first blind hole.

12. Gearbox according to one of the preceding claims, characterized in that the respective flow profile part is designed as a rotary body whose rotational symmetry axis is aligned coaxially with the rotational axis of the impeller.

13. Gearbox according to one of the preceding claims, characterized in that the distance between the oil and the sensor for detecting vanes of the impeller is smaller than the radius of the first blind hole.

14. Transmission according to one of the preceding claims, characterized in that the distance between the oil and the temperature sensor is smaller than the radius of the second blind hole.

15. Gearbox according to one of the preceding claims, characterized in that a plug connector is attached to the block part, to which the sensor lines of the temperature sensor and the sensor lines of the sensor for detecting blades of the impeller are brought and electrically connected.

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