DE102016215941A1 - Protection lowering for sensors - Google Patents

Abstract

The invention relates to a planetary pin (101). This has at least one front-side recess (109) for receiving at least one sensor (111).

Description

The invention relates to a planetary pin according to the preamble of claim 1.

Sensors in a transmission are often used for experimental purposes. When the gearboxes are used in series operation, the sensors are removed. At the attachment of the sensors therefore no high demands are made in terms of durability. Production-ready solutions for mounting sensors within a transmission are not yet known.

The fixation of sensors is particularly problematic on gear parts that move through an oil bath. The passing oil exerts a force on the sensors, which can cause long-term destruction.

The invention has for its object to fix sensors on a planetary bolt, bypassing the known from the prior art solutions inherent disadvantages. In particular, the fixation should be durable and durable against damage.

This object is achieved by a planetary pin according to claim 1. Preferred developments are contained in the subclaims.

According to the invention, the planet pin has at least one front-side recess for receiving at least one sensor.

A recess means a recess in a workpiece, such as a planetary pin, which does not completely penetrate the workpiece. It is therefore a recess with exactly one mouth.

The invention makes it possible to introduce the sensor into the recess and secure it there. This protects the sensor from passing oil. Damage caused by the passing oil is thus avoided.

The recess according to the invention is mounted on the front side. This means that one end face of the planet pin has the recess. In particular, the end face on the mouth of the recess. The depression thus opens into the front.

An end face of the planetary pin is a part of its surface. The planet pin has exactly two end faces. These are characterized in that they the planetary pin in the axial direction, d. H. in the direction of a rotation axis of a planetary pin rotatably mounted on the planet or an axis of symmetry of the planetary bolt limit. Each point of the planetary pin is located on an axially extending path that connects a point of one end face of the planetary pin with a point of the other end face. The said axis of rotation or axis of symmetry extends through the end faces of the planet pin.

Preferably, the end faces are flat surfaces. Further preferred is an axial, d. H. orthogonal to the axis of rotation or axis of symmetry, orientation of the end faces.

The frontal arrangement of the recess is particularly advantageous because it protects the sensor as best as possible against the passing oil.

In a preferred embodiment, the end face is recessed in the axial direction. The recess thus extends axially. Accordingly, at least one cross-sectional area intersects the depression along a closed curve.

A cross-sectional area is defined as a plane, radially oriented surface.

A closed curve is a curve c: [0,1] → ² with c (0) = c (1).

In addition, a rotationally symmetrical basic shape of the planetary pin is preferred. A basic shape of a body is generally a shape from which the body is created by removing material. The result is the planetary bolt from a basic shape, inter alia, by introducing the frontal depression.

Likewise, the recess is preferably rotationally symmetrical. In this case, a first axis of symmetry, to which the basic shape of the planetary bolt is rotationally symmetrical, and a second axis of symmetry, to which the recess is rotationally symmetric, run parallel to one another.

The planetary pin forms a preferred arrangement together with at least one sensor. The sensor is located in the front-side recess and is thus protected against damage caused by flowing lubricant.

The recess forms a cavity bounded by the mouth and the planetary pin or a wall of the planetary pin. The sensor is located at least partially in the recess if and only if at least part of the sensor is located in this cavity.

In a preferred embodiment, the sensor is located completely in the depression. This means that the sensor is completely in the above-mentioned cavity. As a result, the protection of the sensor is further improved by the passing lubricant.

The arrangement is preferably developed with at least one planet carrier having a first bore and a second bore. The two holes are bolt seats. Accordingly, the planetary pin is fixed in the first bore and in the second bore. For example, the planetary pin can be stretched in the two holes, or the planet carrier is shrunk with the holes on the planet pins.

The first hole is open on one side. It is therefore a blind hole, which has exactly one mouth. The second hole, however, is continuous. Accordingly, the second bore has exactly two orifices.

The recess is at least partially in the second hole further education. This means that the recess is arranged axially at least partially between the two openings of the second bore.

Preferably, the recess is completely in the second bore. In this case, the entire recess between the two orifices of the second bore is arranged.

A preferred embodiment of the invention is in 1 shown. Matching reference numbers identify identical or functionally identical characteristics. In detail shows:

1 a planetary bolt with protection lowering.

The planetary pin 101 according to 1 is positive and non-positive in a planet carrier 103 fixed. By means of two tapered roller bearings 105 is a planetary gear 107 rotatable in the planetary pin 101 stored. The planet wheel 107 combs with one in 1 not shown sun gear and a in 1 also not shown ring gear.

The planetary pin 101 indicates a lowering of protection 109 on. This is a deepening in one - from the perspective of 1 - right-hand side 111 of the planetary bolt 101 is introduced.

Through the protection lowering 109 creates a substantially cylindrical cavity. In this cavity are two sensors 111 brought in. With the sensors 111 it may be about sensors for detecting vibration acceleration, oil pressure and / or temperature.

Dive the planet bolt 101 due to a rotation of the planet carrier 103 into a supply of lubricant, the planetary pin is exposed to a lubrication flow. The lowering of the protective lubricant reduces the flow of lubricant from the sensors 111 kept away. Thus, the sensors 111 Protected against damage by passing lubricant. Nevertheless, the sensors come 111 in contact with the lubricant so that physical parameters of the lubricant can be measured by means of the sensors.

LIST OF REFERENCE NUMBERS

101

planet shaft

103

planet carrier

105

Tapered roller bearings

107

planet

109

counterbore

111

sensor

Claims (6)

Planet pins ( 101 ); characterized by at least one frontal recess ( 109 ) for receiving at least one sensor ( 111 ). Planet pins ( 101 ) according to claim 1; characterized in that at least one cross-sectional area of the recess ( 109 ) along a closed curve. Planet pins ( 101 ) according to any one of the preceding claims; characterized in that a basic shape of the planetary bolt ( 101 ) is rotationally symmetric to a first axis of symmetry; the depression ( 109 ) is rotationally symmetric to a second axis of symmetry; wherein the first axis of symmetry and the second axis of symmetry are parallel to each other. Arrangement with at least one planetary pin ( 101 ) according to any one of the preceding claims; characterized by at least one at least partially in the recess ( 109 ) sensor ( 111 ). Arrangement according to the preceding claim; characterized in that the sensor ( 111 ) completely in the depression ( 109 ) is located. Arrangement according to one of the preceding two claims; characterized by at least one planet carrier ( 130 ) having a first bore and a second bore; where the planetary pin ( 101 ) is fixed in the first bore and the second bore; wherein the first bore is open on one side and the second bore is continuous; and where the depression ( 109 ) is at least partially in the second bore.

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