Mounting tool for positioning a shaft seal ring on a shaft and method of forming a shaft seal

Abstract

The present invention relates to an installation tool (1) for sealingly positioning a shaft seal ring (2) on a shaft (3) opposite to the arch (15) of the sealing lip (11) of the shaft seal ring (2), wherein the shaft seal ring (2) has a metallic, annular base (10), a sealing lip (11) fixedly disposed on the base (10) and sealably mounted on the shaft (3), and a spring ring (14) for pre-tightening the sealing lip (11) toward the shaft (3), wherein the sealing lip (11) has an arch (15) pointing outward toward the opening (7) formed by the shaft seal ring (2), and the shaft seal ring (2) has an arch (15) pointing outward toward the opening (7) formed by the shaft seal ring (2). The installation tool includes a can-shaped lower part (4) and a cap-shaped upper part (5), wherein the upper part (5) is releasably fixed to the can-shaped lower part (4) in such a way that the upper part is partially pushed into the lower part at one end, wherein the upper part (5) is substantially tapered at the other end, i.e., at the end opposite to the direction of the lower part, and the outer diameter of the lower part (4) corresponds to the maximum expansion diameter of the sealing lip (15) of the shaft seal ring (2); and a method for forming a shaft seal using the installation tool (1) by means of the shaft seal ring (2) for the shaft (3) extending from the housing (6).

Description

Technical Field

[0001] The present invention relates to a two-piece installation tool for positioning a shaft seal ring on a shaft, and a method for forming a shaft seal by means of the shaft seal ring for the shaft extending from a housing, with the aid of such installation tool. Background Technology

[0002] Shaft seal rings are used to seal the mechanical housing on protruding components, especially rotating shafts, relative to the environment.

[0003] In this type of shaft seal ring, the sealing lip of the shaft seal ring can be arched forward in one direction. To prevent rollover and damage to the sealing lip during installation or positioning of the shaft, a substantially can-shaped mounting sleeve is typically used when pushing the shaft seal ring onto the shaft or when introducing the shaft into the shaft seal ring, and then the mounting sleeve is removed. Summary of the Invention

[0004] The object of this invention is to provide an alternative installation tool, characterized in particular by the ability to easily and conventionally position the shaft seal on the shaft in the opposite direction to the preferred installation direction of the shaft seal ring, i.e., in the direction in which the sealing lip of the shaft seal ring tends to roll over. Furthermore, the object of this invention is to provide a method by means of an installation tool that enables a reliable shaft seal.

[0005] This need can be achieved by the subject matter of the invention according to independent claims 1 and 4. Advantageous embodiments of the invention are described in the dependent claims.

[0006] The installation tool according to the invention is used to reliably position a shaft seal ring on a shaft, wherein the positioning of the shaft seal ring on the shaft is opposite to the preferred installation direction of the shaft seal ring, i.e., opposite to the arch of the sealing lip of the shaft seal ring.

[0007] According to the present invention, the shaft sealing ring has a metallic, annular base, a sealing lip fixedly disposed on the base and sealably mounted on the shaft, and a spring ring for pre-tightening the sealing ring, wherein the sealing lip has an outwardly pointing arched portion toward the shaft. The sealing lip is preferably made of a wear-resistant, elastic material.

[0008] According to the present invention, the installation tool is constructed in two parts and includes a lower part in the shape of a can and an upper part in the shape of a lid.

[0009] According to the invention, the upper part is releasably fixed to the lower part of the can shape in such a way that the upper part is partially pushed into the lower part at one end, i.e., at the first end, and is substantially tapered at the other end, i.e., at the second end opposite to the lower part, gradually tapering towards the second end of the upper part.

[0010] According to the present invention, the outer diameter of the lower portion is designed for the shaft seal ring, or more precisely, the maximum extended diameter of the sealing lip of the shaft seal ring.

[0011] Preferably, the upper portion is at least partially made of abrasion-resistant plastic.

[0012] The lower part of the installation tool is preferably made of surface-hardened steel to ensure its wear resistance and damage resistance (scratching resistance).

[0013] In this context, the term "first direction" is understood as along the arched portion of the sealing lip of the shaft seal ring, i.e., the direction opposite to the open side of the shaft seal ring. Here, this relates to the preferred installation direction of the shaft seal ring. In this context, the term "second direction" is understood as the direction opposite to the arched portion of the sealing lip of the shaft seal ring, i.e., toward the open side of the shaft seal ring. Here, this relates to the non-preferred installation direction of the shaft seal ring.

[0014] The method according to the invention for forming a shaft seal using a shaft seal ring as described above is performed using the mounting tool described above, wherein the shaft seal ring is used to extend a shaft from a housing in the direction opposite to the arch of the sealing lip of the shaft seal ring, i.e., toward the open side of the shaft seal ring, and the method includes at least the following steps:

[0015] 1.) Using an installation tool, the upper part is moved forward along the first direction, i.e., along the direction of the arched portion of the sealing lip of the shaft seal ring, that is, opposite to the open side of the shaft seal ring, past the shaft seal ring, so that the sealing lip of the shaft seal ring is unfolded to its maximum expanded diameter by the force of the lower part and the spring ring of the shaft seal ring.

[0016] The tapered configuration of the upper part of the installation tool allows for easy and safe unfolding of the shaft seal ring, or more precisely, the sealing lip of the shaft seal ring, from the preferred installation direction, i.e., along the first direction of the arched portion of the sealing lip, which is opposite to the open side of the shaft seal ring.

[0017] 2.) Remove the upper part from the lower part along the first direction.

[0018] 3.) The shaft is introduced into the lower part of the installation tool, wherein the shaft is guided in a second direction, that is, opposite to the first direction and thus opposite to the arch of the sealing lip of the shaft seal ring, i.e., towards the open side of the shaft seal ring, but without contacting the shaft seal ring.

[0019] 4.) Remove the lower part of the installation tool along the second direction.

[0020] By unfolding the sealing lip of the shaft seal ring to its maximum expanded diameter, when the lower part of the installation tool is removed in the second direction opposite to the arch of the sealing lip, no material can be pulled under the sealing lip of the shaft seal ring—thus preventing the sealing lip from rolling back.

[0021] The installation tool, regarding the shaft seal ring, particularly the configuration of the sealing lip of the shaft seal ring, moves through the shaft seal ring in a preferred direction, i.e., along a first direction. Normally, a shaft moving through the shaft seal ring from a direction that tends to roll over, i.e., a second direction, would not contact the sealing lip of the shaft seal ring during high-risk engagement (only the installation tool contacts the sealing lip of the shaft seal ring), and thus the sealing lip would not roll over. By unfolding the sealing lip to its maximum expanded diameter via the installation tool, the sealing lip also prevents further rolling over due to the removal of the lower portion of the installation tool. Attached Figure Description

[0022] The present invention will now be described by way of example with reference to the accompanying drawings.

[0023] Figure 1 A housing with an opening is shown, in which a shaft sealing ring is fixed, and an installation tool in a first position.

[0024] Figure 2 It shows an opening and according to Figure 1 The housing of the shaft seal ring and the installation tool in the second position, i.e., the delivery position, in the second position, the installation tool is guided through the opening and then through the shaft seal ring in the housing, and the upper part of the installation tool can be removed.

[0025] Figure 3 The diagram shows the lower portion with an installation tool and the shaft engaged at the end. Figure 1 The shell.

[0026] Figure 4 The arrangement of the housing and shaft is shown in the final installed state, with the lower part of the installation tool removed.

[0027] Figure 5 A section showing a schematic cross-sectional view of the shaft seal ring. Detailed Implementation

[0028] exist Figures 1 to 5 In this invention, the design will be embodied in the arrangement of a housing 6 having an opening 7 and a shaft 3 that is sealed through the opening 7 and then through the shaft sealing ring 2, with the shaft sealing ring 2 fixed in the area of ​​the opening.

[0029] The shaft sealing ring 2 has a metal, annular base 10, i.e., a sheet metal base, a sealing lip 11 made of plastic that is fixedly disposed on the base 10 and can be sealed onto the shaft 3, and a spring ring 14 for pre-tightening the sealing lip 11 toward the shaft 3. The sealing lip 11 has an arched portion 15 toward the shaft 3. Figure 5 ).

[0030] The installation tool 1 according to the invention is used to position the shaft seal ring 2 onto the shaft 3. In the final installed state, the shaft 3 is led out of the housing 6 in the region of the opening 7, sealed via the shaft seal ring 2. In this embodiment, the shaft seal ring 2 is fixedly disposed in the housing 6 and guides the shaft 3 for installation. However, an arrangement in which the shaft 3 remains fixed and the shaft seal ring 2 leads the shaft 3 is also conceivable.

[0031] The installation tool 1 is composed of two parts and includes a lower part 4 in the shape of a can and an upper part 5 in the shape of a lid. Figure 1 ).

[0032] The upper part 5 is releasably fixed to the lower part 4 in a can-shaped manner, wherein the lower part is partially pushed into the lower part 4 at one end, namely the first end 8, and at the other end, namely the second end 9 opposite to the lower part 4, is substantially tapered and gradually tapers toward the second end 9 of the upper part 5.

[0033] The upper part 5 is partially made of plastic, particularly in the region of the first end 8 of the upper part 5.

[0034] The outer diameter of the lower part 4 of the installation tool 1 is designed for the maximum extended diameter of the shaft seal ring 2, or more precisely, the sealing lip 15 of the shaft seal ring 2.

[0035] In this context, the term "first direction" is understood as the direction along the arched portion 15 of the sealing lip 11 of the shaft seal ring 2, i.e., the direction opposite to the open side 16 of the shaft seal ring 16. In this context, the term "second direction" is understood as the direction opposite to the arched portion 15 of the sealing lip 11 of the shaft seal ring 2, i.e., the direction toward the open side 16 of the shaft seal ring 2. Regarding Figures 1 to 5 The first direction therefore corresponds to the direction along the first arrow 12 and the second direction corresponds to the direction along the second arrow 13.

[0036] The method for forming a shaft seal using the shaft seal ring 2 is as described above, utilizing the installation tool 1 ( Figure 1 The method comprises at least the following steps: The shaft sealing ring is used for the shaft 3 extending from the housing 6, wherein the shaft extends from the housing 6 in the opposite direction to the arch 15 of the sealing lip 11, i.e., toward the open side 16 of the shaft sealing ring 2, and the method comprises at least the following steps:

[0037] 1.) Using the installation tool 1, the upper part 5 is moved forward along the first direction 12 past the shaft seal ring 2, so that the sealing lip 11 of the shaft seal ring 2 is unfolded to its maximum expanded diameter by the force opposite to that of the lower part 4 and the spring ring 14. Figure 2 ),

[0038] The tapered configuration of the upper part 5 of the installation tool 1 allows the shaft sealing ring 2, or more precisely, the sealing lip 11 of the shaft sealing ring 2, to be easily and safely unfolded from the preferred direction, i.e., along the first direction of the arched portion 15 of the sealing lip 11, which is opposite to the open side 17 of the shaft sealing ring 2.

[0039] 2.) Remove the upper part 5 from the lower part 4 along the first direction 12, leaving the lower part 4 of the installation tool in the shaft seal ring 2 and unfolding the sealing lip 11 to its maximum extended diameter in opposition to the force of the spring ring 14.

[0040] 3.) The shaft 3 is introduced into the lower part 4 of the installation tool 1, wherein the shaft 3 is guided along the second direction 13, that is, opposite to the first direction 12 and thus opposite to the arch 15 of the sealing lip 11 of the shaft sealing ring 2. Figure 3 ),

[0041] 4.) Remove the lower part 4 of the installation tool 1 along the second direction 13. Figure 4 ).

[0042] By unfolding the sealing lip 11 of the shaft seal ring 2 to its maximum extended diameter, no material can be pulled under the sealing lip 11 of the shaft seal ring 2 when the lower part 4 of the installation tool 1 is removed—thus preventing the sealing lip 11 from rolling over.

[0043] The installation tool 1 moves through the shaft seal ring 2 in a preferred direction regarding the configuration of the shaft seal ring 2, particularly the sealing lip 11 of the shaft seal ring 2, i.e., in a first direction 12 along the arch 15 of the density lip 11. The shaft 3, which normally moves through the shaft seal ring 2 from a direction tending towards the folding of the sealing lip 11, i.e., in a second direction 13 opposite to the arch 15 of the sealing lip 11 of the shaft seal ring 2, does not contact the sealing lip 11 of the shaft seal ring 2 during high-risk engagement, thus preventing the sealing lip from folding.

[0044] By unfolding the sealing lip 11 of the shaft sealing ring 2 to its maximum extended diameter, the sealing lip can no longer be rolled up due to the removal of the lower part 4 of the shaft sealing ring 2.

[0045] List of reference numerals

[0046] 1 Installation tools

[0047] 2-axis sealing ring

[0048] 3-axis

[0049] Part 4

[0050] Part 5

[0051] 6 shells

[0052] 7 openings

[0053] 8 (the upper part) first end

[0054] 9 (the upper part) second end

[0055] 10 matrix

[0056] 11 sealing lip

[0057] 12 First arrow (1. Direction)

[0058] 13. Second arrow (2. Direction)

[0059] 14 Spring Rings

[0060] 15 (Sealing lip) arched portion

[0061] 16-axis sealing ring open side

Claims

1. An installation tool (1) for sealingly positioning a shaft seal ring (2) on a shaft (3) opposite to the arch (15) of the sealing lip (11) of the shaft seal ring (2), wherein the shaft seal ring (2) has a metallic, annular base (10), a sealing lip (11) fixedly disposed on the base (10) and sealably mounted on the shaft (3), and a spring ring (14) for pre-tightening the sealing lip (11) toward the shaft (3), wherein the sealing lip (11) has an outwardly facing, toward the shaft seal ring (15) 2) The direction of the opening (7) is directed towards the arch (15). The installation tool has a can-shaped lower part (4) and a cap-shaped upper part (5), wherein the upper part (5) is releasably fixed to the can-shaped lower part (4) in such a way that the upper part is partially pushed into the lower part at one end, wherein the upper part (5) is substantially tapered at the other end, i.e. at the end opposite to the direction of the lower part, and the outer diameter of the lower part (4) corresponds to the maximum expansion diameter of the sealing lip (11) of the shaft sealing ring (2).

2. The installation tool (1) according to claim 1. Its features are, The upper part (5) is at least partially made of plastic.

3. A method for forming a shaft seal using an installation tool (1) according to any one of claims 1 to 2 by means of a shaft seal ring (2) for a shaft (3), the shaft being led out of a housing (6) in the installation direction opposite to the arch (15) of the sealing lip (11) of the shaft seal ring (2), wherein the shaft seal ring (2) has a metallic, annular base (10), a sealing lip (11) fixedly disposed on the base (10) and sealably mounted on the shaft (3), and a spring ring (14) for pre-tightening the sealing lip (11) toward the shaft (3), wherein the sealing lip (11) has an arch (15) pointing outward toward an opening (7) formed by the shaft seal ring (2), the method comprising at least the following steps: - Using the installation tool (1), the upper part (5) is moved forward along the first direction (12), that is, along the direction of the arch (15) of the sealing lip (11) of the shaft seal ring (2), so that the sealing lip (11) of the shaft seal ring (2) is unfolded to its maximum extended diameter by the force of the lower part (4) and the spring ring (14) of the shaft seal ring (2). - Remove the upper part (5) from the lower part (4) along the first direction; - The shaft (3) is introduced into the lower part (4) of the installation tool (1), wherein the shaft (3) is guided along the second direction (13), that is, the direction opposite to the first direction (12), and thus opposite to the arch (15) of the sealing lip (11) of the shaft sealing ring (2); - Remove the lower part (4) of the installation tool (1) along the second direction (13).

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