Transmission component with emergency lubrication device

Abstract

The invention relates to a transmission component having an emergency lubrication device, the transmission component (101) having at least one bore (103) for conducting oil between two ports (105) and having means (209) which are arranged and fixed at least partially in the bore (103). The transmission component (101) has an axially displaceable piston (205) arranged in the bore (103) and a spring (207) tensioned between the device (209) and the piston (205); wherein the spring (205), together with the means (209), is located on a different side of the piston (205) from the through-opening (105).

Description

Field of the Invention

[0001] The present invention relates to a transmission component according to the preamble of claim 1. Background Art

[0002] An operating wind power facility needs to be stopped occasionally, for example in case of a fault or excessive wind. When stopping, the lubricant pressure generated by mechanically connecting a lubricant pump in the drive train drops, while the transmission is under full load due to the wind still acting on the rotor. This can lead to damage of bearings and gears due to insufficient lubrication.

[0003] Electric lubricant pumps are relatively prone to failure and also depend on the presence of an electrical power supply. In case of pump failure or interruption of the electrical power supply, insufficient lubrication also occurs with the above - mentioned consequences.

[0004] A system for emergency lubrication is known from EP 3074689 A1. The lubricant is placed under pressure by means of a spring - loaded piston. This pressure is sufficient to safely bring the transmission to a standstill in case of impending lack of lubrication. The piston is installed in a separate container. This increases the structural space requirement on the one hand and also makes it impossible to install the piston near the lubrication site on the other hand. Summary of the Invention

[0005] The object of the present invention is to provide an improved emergency lubrication section. This object is solved by the transmission component according to claim 1. Preferred improvements are included in the dependent claims and result from the following description.

[0006] The transmission component according to the invention has at least one hole for guiding oil. Thus, the hole is configured as part of the oil line of the transmission. This means that the hole has an inlet port and an outlet port for the oil. The oil entering the hole via the inlet port is guided from the hole to the outlet opening and discharged from the hole there. The ports can be arranged coaxially with the central axis of the hole respectively, or arranged in the circumferential side surface of the hole. In particular, one port can be arranged coaxially with the central axis of the hole, while the other ports are arranged in the circumferential side surface. The port arranged coaxially with the central axis of the hole is the same as the port left by the drill bit when drilling is completed.

[0007] The transmission component also has a device at least partially arranged in the hole. Thus, at least a part of the device, preferably the whole device, is located in the hole. In addition, the device is fixed in the hole. The device is preferably rigidly fixed in the hole, that is, such that no relative movement can occur between the device and the hole.

[0008] According to the present invention, the transmission device component has a piston which is arranged in a hole and can move relative to the hole in the axial direction, i.e., along the central axis of the hole. The piston is preferably sealed relative to the circumferential side surface of the hole in a fluid-tight manner. For this purpose, the piston has, for example, one or more sealing rings which are arranged coaxially with the central axis of the hole and extend between the piston and the circumferential side surface.

[0009] The transmission device component also has a spring. Here, a spring generally refers to a device that exerts a spring force. For example, the spring can be a helical spring. The spring is tensioned between the device and the piston. This means that the spring exerts spring forces of equal magnitude and opposite directions on the device and the piston. The spring force acts outward from the spring. Thereby, the device and the piston are pushed apart from each other.

[0010] The spring together with the device is located on a different side of the piston from the above two ports. Thus, the spring together with the device is located on one side of the piston, while the ports are located on the other side of the piston. The piston divides the hole into a first cavity and a second cavity. The first cavity and the second cavity are located on different sides of the piston. The spring and the device are located in the first cavity. The second cavity has ports. The second cavity serves to guide the oil from the inlet port to the outlet port accordingly.

[0011] The oil in the second cavity is loaded with pressure via the spring and the piston. This makes it possible to maintain the oil pressure for a short time in case of a failure of the main lubricant supply and to safely bring the transmission device into a stopped state.

[0012] This construction according to the present invention in terms of the transmission device component is particularly advantageous because no additional structural space is required. This makes it possible to arrange it in the vicinity of the lubrication site.

[0013] In a preferred improvement, the device is screwed into the hole. Thereby, the placement of the device is simplified. Preferably, the hole is provided with an internal thread and the device is provided with an external thread which is screwed into the internal thread.

[0014] Preferably, the transmission device component is improved with a sleeve which is at least partially, preferably entirely, arranged and fixed in the hole. The sleeve is preferably rigidly fixed in the hole, i.e., there is no relative movement possible between the sleeve and the hole at all. In particular, the sleeve can be a sleeve in the form of at least a partially hollow cylinder.

[0015] Again, the device is at least partially, preferably entirely, arranged and fixed in the sleeve. Preferably, the device is rigidly fixed in the sleeve, i.e., there is no relative movement possible between the device and the sleeve at all.

[0016] Furthermore, according to the improved solution, the piston is also arranged in the sleeve. In particular, the piston can be sealed fluid-tightly relative to the circumferential side surface of the sleeve. For this purpose, the piston has, for example, one or more sealing rings, which are arranged coaxially with the central axis of the hole and extend between the piston and the circumferential side surface.

[0017] Since the piston can move within the hole while the sleeve is fixed in the hole, the piston can also move within the sleeve. Thus, the piston, in cooperation with the sleeve, performs the functions described at the beginning. According to the improved solution, a spring is also arranged in the sleeve.

[0018] Using the sleeve according to the improved solution is advantageous because the piston, the device, and the spring can be pre-assembled in the sleeve. Then the assembly consisting of the sleeve, the device, the spring, and the piston is placed and fixed in the hole. Thereby, the assembly is simplified. In addition, no costly finishing is required for smoothing the circumferential side surface of the hole because the piston is guided by the circumferential side surface of the sleeve.

[0019] The sleeve preferably has an internal thread and an external thread. The sleeve is screwed into the corresponding internal thread of the hole through the external thread. The device preferably also has an external thread corresponding to the internal thread of the sleeve, and the device is screwed into the internal thread of the sleeve through this external thread.

[0020] Furthermore, in another preferred improved solution, the device has intake and exhaust openings. The intake and exhaust openings connect the first cavity to the environment in a gas-conducting manner. Thereby, it is possible to prevent the air in the first cavity from being compressed and thus working against the spring force.

[0021] In a preferred improved solution, the transmission component is designed as a transmission housing, a planet carrier, or a planet pin. Thus, the transmission housing, the planet carrier, or the planet pin has the above-mentioned hole, device, piston, and spring.

[0022] Preferably, the transmission component is improved as part of a wind turbine transmission. The wind turbine transmission has at least one oil line, which is configured to supply oil to at least one lubrication site. The lubrication site refers to a component of the wind turbine transmission that needs to be supplied with oil during operation to prevent wear. The component is a gear or a bearing, such as a planetary gear bearing.

[0023] According to the improved solution, the hole forms the first part of the oil line. Then the second part of the oil line is connected to the inlet port or the outlet port of the hole in an oil-conducting manner. In particular, the second part can be connected to the inlet port in an oil-conducting manner, while the third part of the oil line is connected to the outlet port in an oil-conducting manner.

[0024] With this improved solution, the lubricant pressure generated by the oil pump acts on the piston. As a result, the piston moves in the direction of the device, causing the spring to be tensioned between the device and the piston. Therefore, the force exerted by the spring on the piston acts in the opposite direction to the lubricant pressure. If the pressure applied by the oil pump drops, the lubricant pressure in the oil line will be maintained for a while due to the tensioned spring. Thereby, the wind turbine drive can enter the stop state without the risk of insufficient lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Preferred embodiments of the present invention are shown in the drawings. Identical reference numerals herein represent identical or functionally identical features. In the drawings:

[0026] Figure 1 The planetary pin is shown;

[0027] Figure 2 The emergency lubrication device in the relaxed state is shown; and

[0028] Figure 3 The emergency lubrication device in the compressed state is shown. DETAILED DESCRIPTION OF THE INVENTION

[0029] In Figure 1 shown, the planetary pin 101 has a hole 103. This hole is used to supply oil to the planetary gear bearing. For this purpose, the hole 103 has two ports 105 through which oil enters or exits the hole 103. Depending on the direction of oil flow, the port 105 can be selectively used as an inlet port or an outlet port.

[0030] To supply sufficient oil to the planetary gear bearing in case of failure of the normal lubricating oil supply or when the drive stops, the emergency lubrication device 107 is placed in the hole 103. The hole 103 has an internal thread 109

[0031] In Figure 2 and Figure 3 the emergency lubrication device 107 is shown in detail. Here, the emergency lubrication device 107 is installed in the sleeve 201. The sleeve has an external thread 203 which is screwed with the internal thread 109 of the hole 103.

[0032] Inside the sleeve 201 there is a piston 205, a spring 207 and a plug 209. The plug 209 is constructed with an external thread 211 which is screwed with the corresponding internal thread 213 of the sleeve 201.

[0033] The spring 207 is tensioned between the piston 205 and the plug 209. The spring exerts spring forces acting in opposite directions and outwardly on the piston 205 and the plug 209.

[0034] Figure 2Shows the emergency lubrication device 107 in a relaxed state. The emergency lubrication device 107 is in this state when there is no oil pressure.

[0035] If oil pressure is built up during normal operation by the main oil pump, this oil pressure acts on the piston 205 and causes the piston to move in the direction of the plug 209. Figure 3 Shows the corresponding positioning of the piston 205.

[0036] The spring 207 is compressed due to the movement of the piston 205. When the oil pressure drops, the piston 205 moves in the opposite direction. Through the spring force acting on the piston 205, it is possible to compensate for the drop in oil pressure until the piston reaches Figure 2 The initial positioning shown.

[0037] List of reference numerals

[0038] 101 planetary pin

[0039] 103 hole

[0040] 105 port

[0041] 107 emergency lubrication device

[0042] 109 internal thread

[0043] 109 internal thread

[0044] 201 sleeve

[0045] 203 external thread

[0046] 205 piston

[0047] 207 spring

[0048] 209 plug

[0049] 211 external thread

[0050] 213 internal thread

Claims

1. A transmission component (101) having at least one hole (103) for guiding oil between two ports (105) and having a device (209), wherein the device is at least partially arranged and fixed in the hole (103); Characterized in that it has an axially movable piston (205) arranged in the hole (103) and a spring (207) tensioned between the device (209) and the piston (205); wherein the spring (205) together with the device (209) is on a different side of the piston (205) from the port (105).

2. The transmission component (101) according to claim 1, Characterized in that the device (209) is screwed into the hole (103).

3. The transmission component (101) according to any one of the preceding claims; Characterized in that it has a sleeve (201) at least partially arranged and fixed in the hole (103); wherein, the device (209) is at least partially arranged and fixed in the sleeve (201); and wherein, the piston (205) is arranged in the sleeve (201).

4. The transmission component (101) according to any one of the preceding claims, Characterized in that the device (209) has intake and exhaust openings ().

5. The transmission component according to any one of the preceding claims, which is designed as a transmission housing, a planet carrier or a planet pin (101).

6. A wind turbine transmission having at least one oil line for supplying oil to at least one lubrication site; characterized in that it has a transmission component (101) according to any one of the preceding claims; wherein, the hole (103) forms part of the oil line.

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