JP2008500499A - Spinner-Upper roller for draft mechanism - Google Patents

Abstract

  The upper roller for the spinning machine-draft mechanism has a roller body (4) rotatably supported on a shaft (2), and the shaft (2) has two ball rows ( For the rolling bearing formed from (5, 6), it has two rolling paths (10, 11) with high surface quality. One opening of the roller body (4) is closed by a cover (15) configured as a lid and the opposite opening is closed by a sealing device (14) between the roller body (4) and the shaft (2). ing. The cover (15) and the sealing device (14) are such that the rolling bearing is hermetically sealed against the surroundings, and an inner chamber is formed for the rolling bearing lubricant that is sufficient for receiving grease stock over the service life. It is configured.

Description

  The present invention relates to an upper roller for a spinning machine-draft mechanism having the superordinate features of claim 1.

  The upper roller is used as an inlet-outlet- and belt-upper roller in a spinning machine-draft mechanism for fiber drafting.

  DE-AS 1164288 describes an upper roller for a spinning machine-draft mechanism, in which two roller bodies are rotatably supported on a common shaft. On the inside, the roller body is sealed against the periphery by an axially movable sealing member having two sealing flanges spaced apart from each other. A seal gap remains between both seal flanges and the bearing outer race. In such a sealing device, contaminants, particularly fiber waste, may enter through the seal gap. Therefore, the upper roller is configured so that it is easy to reliably clean the inner chamber in order to remove the invading contaminants.

  DE 19509055 C1 is a twin-type upper roller for a spinning machine-draft mechanism, having two roller bodies, each supported by two rolling bearings at the end of one common consistent shaft. Are disclosed. A roller body called an outer ring of the upper roller protrudes laterally beyond the shaft end. On the end face side, the roller body is provided with a cover, which forms at least a part of the cylindrical jacket of the upper roller.

  The post-lubrication time of the upper roller supported by today's ball is remarkably advanced compared to the previous configuration. The upper roller is typically post-lubricated after about 50000 hours of operation time, especially if it is used as an inlet or outlet roller. The inlet or outlet roller is operated at a higher load or at a higher speed than the belt roller. The upper roller of the draft mechanism usually has the same configuration regardless of the place of use. Therefore, when the upper roller of the known configuration is used as a belt roller, it has a lubricating action that is sufficient as a lifetime lubrication. This lubricating action is a lifetime lubrication in the case of the upper roller used as an entrance roller or an exit roller. Is insufficient. It is known to configure the closure lid of the upper roller with a rear lubrication hole. The post-lubrication holes allow post-lubrication to be performed in a simple manner using a suitable post-lubricator. In order to keep the post-lubrication interval as large as possible, it is desirable to seal the bearing device well. This is done by means of a low-friction gap seal known from DE-AS 1 164 288 or DE 19509055 C1 or by a frictional multi-disc sealing device which is selectively self-adjusting. However, for a somewhat better sealing action for a multi-disc sealing device, a significantly higher cost is required. In the post-lubrication process, there is a risk that maintenance will be performed incorrectly, both in the case of gap seals and in the case of multiple discs that rub. The error is either an excessive supply or an excessive supply of lubricant to the bearing device. In the case of oversupply, the lubricant exits through the seal gap due to overfilling. This can occur during the post-lubrication process itself, or can be based on increased bearing friction due to grease compaction when the bearing is inserted. The leached lubricating grease collects contaminants and fibers to a considerable degree. If the upper roller is not carefully cleaned before post-lubrication, the post-lubrication process will also draw contaminants into the bearing device. The operating conditions of the upper roller impose high demands on the lubricant.

  In order to achieve sufficient operation time, it is necessary to use high-cost special grease. In addition to the above-mentioned drawbacks, erroneous or inadequate maintenance causes a heavy use of the lubricant and thus unnecessarily increased maintenance costs.

  An object of the present invention is to improve the known upper roller.

  This problem has been solved according to the invention by the features of claim 1.

  Advantageous configurations of the invention are the subject of the dependent claims.

  The high surface quality of the rolling path, combined with sufficient lubrication, reduces contamination of the rolling bearing due to wear between the sphere and the rolling path. The cover that always closes the opening of the roller body at the free end of the shaft and the sealing device according to the present invention at the other end of the roller body, on the one hand, the entry of contaminants from the periphery of the roller body into the inner chamber Against the other, and prevents the liquid lubricant component from leaching out. This eliminates the disadvantage that the leaching lubricant is distributed on the shaft or on the roller body and collects dirt or dust adhering to it. This sealing device itself does not take up a large space. This provides space for lubricants, particularly lubricating grease. Thus, sufficient lubricant is prepared on both sides of the row of balls arranged toward the other end of the roller body for the lifetime lubrication of the rolling transfer. In the arrangement of the present invention, a sufficient amount of lubricant stock is metered and metered in close proximity to each of the ball trains. This guarantees the action of the lubricant as a lifetime lubrication.

  The seal according to the invention allows an intimate contact with the reaction sealing surface formed by the inner bore of the roller body. Pushing into the inside, especially when a seal is assembled, becomes easy.

  According to the structure of claim 3, the seal lip on the outside contacts the corresponding seal surface formed by the inner hole of the roller body without forming a chamfer and without a gap. Fibers or contaminants are trapped and do not enter the rolling bearing placed inside the roller body.

  The L-shaped metal carrier according to claim 4 improves the assembly, stability and durability of the sealing device.

  A particularly durable and reliable construction can be obtained with a low friction sealing material vulcanized to the holding body according to claim 5 or a sealing material sprayed onto the holding body according to claim 6.

  The surface quality of the rolling path whose roughness depth does not exceed a value of 0.2 μm enables less wear and longer service life of the rolling bearing.

  The cover according to claim 8 can be constructed with a small wall thickness and prevents any ingress of contaminants or fibers.

  The upper roller in which the cover is positioned in the roller body so that the end surface of the cover of the upper roller is retracted with respect to the end surface of the roller body can be placed in a stable state in the end surface of the roller body.

  With the upper roller of the present invention, lifetime lubrication is guaranteed even at higher loads and speeds to which the inlet or outlet roller is exposed, compared to the belt roller. Maintenance costs that were common for post-lubrication are no longer necessary. This saves maintenance costs and lubricant costs that are no longer needed.

  Lubricant stock sufficient for lifetime lubrication can be suitably distributed in relation to the position of the ball row during assembly of the upper roller. Maintenance mistakes made by service personnel during post-lubrication, such as over-lubrication of the bearing or entrainment of contaminants into the inner chamber of the upper roller, are eliminated.

  The sealing device according to the present invention can be suitably manufactured in terms of cost, and can be easily and easily assembled.

  An advantage of the construction of the upper roller according to the invention is that it does not require high costs compared to, for example, a general cover with rear lubrication holes and known adjustable multiple disc seals.

  Further details of the invention are disclosed in the illustrated embodiment.

  FIG. 1 is a perspective view of a partially sectioned upper roller.

  FIG. 2 is a sectional view of a part of the upper roller.

  FIG. 3 is an enlarged sectional view of the sealing device.

  The upper roller 1 shown in the embodiment of FIG. 1 has a shaft 2 with a central portion 3 reduced in diameter. At the center 3, the upper roller 1 is held during use by a holding arm (not shown) for the sake of simplicity. One roller body 4 is rotatably disposed at each end of the shaft 2. For this purpose, the roller body 4 is supported by two ball rows 5 and 6. The balls 7 of the ball rows 5 and 6 are guided by ball bearing cages 8 and 9 configured as snap cages and move on rolling paths 10 and 11 formed on the shaft 2. For the ball train 6, a rolling path 12 is additionally formed in the inner hole of the roller body 4 as shown in FIG. 2. The additional rolling path 12 absorbs the axial force generated in both directions by the balls 7 of the ball array 6 in cooperation with the rolling path 10 in the roller body 4.

  The inner chamber 13 of the roller body 4 is closed by a sealing device 14 on the side toward the central part 3 and hermetically closed by a cover 15 configured as a lid on the side at the end of the shaft 2. The cover 15 is not provided with a rear lubrication opening. The cover 15 partially has a raised portion 16 on the outer periphery, and the cover 15 engages with one annular groove in the inner hole of the roller body 4. In this way, a reliable seating and good sealing action of the cover is achieved which is not impaired or temporarily disturbed by maintenance work.

The sealing device 14 includes a ring-shaped metal holding body 18 configured in an L shape and an elastic seal 19. The seal 19 is made of a sealing material having a small elastic friction and vulcanized to the holding body 18 so as not to be dissociated. As the outer diameter D _L of the seal 19 is shown in FIG. 3, slightly smaller than the inner diameter D _A of the roller body 4. The seal 19 has seal lip tips 20 and 21 on the outer diameter, and the seal lip tips 20 and 21 exert a seal covering action and a seal lip preload action at the operating position of the seal device 14. The end face of the seal 19 extends perpendicular to the surface of the inner hole of the roller body 4 or is located perpendicular to the rotational axis of the sealing device 14 and the rotational axis of the shaft 2.

  When the upper roller 1 is assembled, the sealing device 14 is first fitted over the shaft 2 beyond the bearing of the roller body 4. In this state, the roller body 4 is tilted to attach the ball rows 5 and 6. Through a bearing which is still open, a lubricant, for example special grease, can be dispensed or applied to the area of both ball rows 5 and 6 and the area of the contact surface of the seal 19 without being blocked. After being supplied to the seal 19, the seal 19 is pushed into the operating position. This operating position is shown in FIGS. The seal 19 is formed in a U-shape, thereby forming a groove 26 extending annularly on the end face side. The U-shaped shape of the seal 19 and its orientation facilitate the sliding of the seal lip 22 into the rotor body 4 when the seal device 14 is assembled. In addition, the seal 19 contacts the surface 24 of the inner hole of the roller body 4 with a slight but sufficient radial pressing force.

  The seal 19 contacts the inner hole of the roller body 4 in the tangential direction at the outer leg portion of the seal lip 22 formed in a U-shape. The surface 24 of the inner bore of the roller body 4 acts as a sealing surface that cooperates with the seal 19. The position of the surface 24 of the inner hole of the roller body 4 and the position of the surface 23 of the shaft 2 after the sealing device 14 has been incorporated into the upper roller 1 are indicated by one-dot chain lines in FIG. A chamber 25 is formed between the seal lip 22 of the seal 19 and the surface 24 of the inner hole of the roller body 4 and between the seal lip tips 20 and 21. The construction of the sealing device 14 with the sealing lip tips 20, 21 effectively improves and allows protection against contamination penetration and lubricant penetration into the roller body 4.

  The upper roller 1 of the draft mechanism constructed according to the invention can also be used as an inlet or outlet roller with lubrication sufficient for lifetime lubrication.

The perspective view which carried out the cross section of the upper roller partially. Sectional drawing of 1 part of an upper roller. The expanded sectional view of a seal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper roller 2 Axis 3 Center part 4 Roller body 5,6 Ball row 7 Ball 8,9 Ball bearing cage 10,11 Rolling path 12 Rolling path 13 Inner chamber 14 Sealing device 15 Cover 16 Raised part 17 Groove 18 Holding body 19 Seal 20, 21 Seal tip 22 Seal lip 23 Surface 24 Surface 25 Chamber

Claims (9)

  An upper roller for an entrance roller and an exit roller in a spinning machine-draft mechanism, having a plurality of roller bodies rotatably supported on a stationary shaft, the shaft being held only in the center And two rolling paths with high surface accuracy on the roller body for one rolling bearing formed from two ball rows and at the free end of the shaft In a type having a cover for closing the opening on the end face side and a seal device that acts only between the roller body and the shaft at the other end of the roller body, the rolling bearing is The cover (15) and the sealing device (14) are configured such that an inner chamber is formed for the rolling bearing lubricant that is sealed and is large enough for a grease stock for a lifetime. The sealing device (14 The seal (19) has an elastic seal lip (22), and the seal lip (22) contacts the inner hole of the roller body (4) in a tangential direction with a slight pressing force. , Spinner-Draft mechanism upper roller.   The upper roller according to claim 1, wherein the sealing device (14) has a seal (19) with a groove (26) extending annularly on the end face side.   A web-like seal lip tip (20, 21) extending in an annular shape is formed on the outer periphery of the seal lip (22), and the end surface of the seal lip (22) opposite to the rolling bearing and the seal lip ( The upper roller according to claim 2, wherein the side surface of the seal lip tip (21) arranged at the edge of 22) extends perpendicularly to the surface of the inner hole of the roller body (4).   The sealing device (14) has an L-shaped metal holding body (18), the holding body (18) can be fitted onto the shaft (2), and the holding body (18) 4. Upper roller according to claim 1, wherein the seal (19) is fixedly connected.   The upper roller according to claim 4, wherein the seal (19) is made of a low-friction seal material vulcanized to the holding body (18).   The upper roller according to claim 4, wherein the seal (19) is made of a low-friction seal material sprayed onto the holding body (18).   7. The surface quality of the rolling path (10, 11, 12) is configured so that a value of 0.2 μm cannot be exceeded at a rough surface depth Ra. Top roller.   The upper roller according to any one of claims 1 to 7, wherein the cover (15) is configured without an opening therethrough.   The cover (15) is arranged on the roller body (4) so that the end of the cover (15) is retracted relative to the end surface of the roller body (4). Upper roller as described in item.

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