Adjustable hydraulic tensioning device for grinding wheel shaft of dresser of gear grinding machine

Abstract

The utility model relates to a grinding wheel shaft expansion sleeve, in particular to an adjustable hydraulic expansion device for a grinding wheel shaft of a dresser of a gear grinding machine, which is used for solving the problems that the clamping of the dresser is loosened and the machining precision of equipment is influenced due to the fact that the expansion force of an expansion sleeve in the prior art is reduced after the expansion sleeve is used for a long time. The oil seal comprises an outer ring, an inner ring, a bush, a jackscrew arranged on the outer ring and a sealing piece arranged in an oil storage cavity in the bush, hydraulic oil channels are designed between the bush and the outer ring and between the bush and the inner ring, the bush is further provided with an oil channel enabling the oil storage cavity to be communicated with the hydraulic oil channels, and a communication area is filled with hydraulic oil. When the tensioning device is used, the tensioning device is installed between the grinding wheel and a grinding wheel shaft, the jackscrew is manually rotated, the sealing piece is pushed to move inwards, hydraulic oil is pushed into the hydraulic oil channel, and positioning and clamping between the grinding wheel and the grinding wheel shaft are achieved through the pressure of the hydraulic oil on the outer ring and the inner ring.

Description

Technical Field

[0001] The utility model relates to a grinding wheel shaft expansion device, in particular to an adjustable hydraulic expansion device for a grinding wheel shaft of a gear grinding machine dresser. Background Art

[0002] Currently, the mainstream design for the dresser wheel mounting system in gear grinding machines, such as the Reishauer RZ260 and RZ550 gear grinding machines, is based on a mechanical flange fastening system. This system achieves high-precision clamping and positioning of the dresser wheel by peripherally fastening the flange on the grinding wheel spindle.

[0003] Chinese patent CN109877353B discloses an internal support type core expansion positioning tool, which utilizes the cooperation of the outer conical surface provided at the axial front end of the pulling core and the inner conical surface provided at the axial front end of the expanding sleeve. The outer conical surface of the pulling core is displaced axially backward, causing the inner conical surface of the expanding sleeve to produce radial deformation, thereby tightening the inner hole of the workpiece to be processed outside the expanding sleeve; Chinese patent CN206305487U discloses a tightening tooling device for drilling in a CNC machining center, which utilizes the conical outer surface of the expanding core to cooperate with the conical inner surface of the conical expansion sleeve. During use, the conical expansion sleeve moves downward along the outer wall of the expanding core, thereby expanding the volume of the conical expansion sleeve until the workpiece is fixed. The expansion degree of the conical expansion sleeve can be appropriately adjusted by the movement amplitude of the pull rod according to the aperture of the workpiece. Both of the above tensioning devices use mechanical methods for tightening. While these methods do provide good initial tightening results, they suffer from a common problem over time: the tensioning force gradually decreases over time, which can easily lead to loosening of the dresser clamp, seriously affecting the machining accuracy of the equipment and even causing substandard quality of mass-produced gears. Therefore, there is an urgent need for a tensioning device that can maintain tension strength over a long period of time. Utility Model Content

[0004] The main purpose of the utility model is to solve the problem that the tensioning force of the existing tensioning sleeve decreases after long-term use, thereby causing the dresser clamping to loosen and affecting the processing accuracy of the equipment, and to provide an adjustable hydraulic tensioning device for the grinding wheel shaft of the gear grinding machine dresser.

[0005] The concept of this utility model is to abandon the traditional mechanical single tensioning mode and adopt a design scheme with both mechanical positioning and hydraulic tensioning mechanisms. The hydraulic pressure is used to tighten the grinding wheel, thereby accurately achieving simultaneous positioning and firm clamping of the inner and outer rings to ensure their stability.

[0006] In order to achieve the above objectives and complete the above concepts, the present invention provides the following technical solutions:

[0007] An adjustable hydraulic tensioning device for a grinding wheel spindle of a gear grinding machine dresser comprises an outer ring and an inner ring, and its special features are:

[0008] The outer ring and the inner ring are both stepped structures and are divided into a large diameter section and a small diameter section; the small diameter section of the inner ring is sleeved inside the outer ring and abuts against the inner wall of the small diameter section of the outer ring; the inner end surface of the large diameter section of the inner ring abuts against the end of the large diameter section of the outer ring; thus, an annular area is formed between the outer ring and the inner ring, and a bushing is installed in the annular area; a positioning hole is also provided on the small diameter section of the outer ring;

[0009] The inner wall of the bushing abuts against the outer wall of the small diameter section of the inner ring, and the outer wall of the bushing abuts against the inner wall of the large diameter section of the outer ring;

[0010] An outer hydraulic oil channel and an inner hydraulic oil channel are respectively provided between the bushing and the outer ring and the inner ring;

[0011] An oil storage cavity is axially provided on the bushing, and oil passages are radially provided on the bushing, connecting the oil storage cavity with the external hydraulic oil passage and the internal hydraulic oil passage, respectively. The oil storage cavity and the connected oil passages are filled with hydraulic oil; a connecting hole communicating with the oil storage cavity is provided on the side of the bushing that abuts against the large-diameter section of the inner ring;

[0012] A threaded hole is axially formed on the large diameter section of the inner ring at a position corresponding to the communicating hole on the bushing; a top screw is installed in the threaded hole, and the end of the top screw extends into the communicating hole;

[0013] The oil storage cavity of the bushing is provided with a seal which is adapted to the radial cross-sectional shape of the oil storage cavity and whose outer wall abuts against the inner wall of the oil storage cavity, so that the communication area is sealed in the welding body, and the outer end of the seal abuts against the top end of the top screw.

[0014] Furthermore, a sealing plug is installed in the communicating hole, and the sealing member abuts against the top end of the top screw through the sealing plug to further prevent leakage of hydraulic oil during operation.

[0015] Furthermore, the oil storage cavity is a cylindrical cavity arranged along the axial direction, and the diameter of the communicating hole is equal to the diameter of the cylindrical cavity.

[0016] Furthermore, an annular groove is provided on the outer wall of the small diameter section of the inner ring, which cooperates with the inner wall of the bushing to form an annular inner hydraulic oil channel.

[0017] Furthermore, an annular groove is provided on the inner wall of the large diameter section of the outer ring, which cooperates with the outer wall of the bushing to form an annular external hydraulic oil channel.

[0018] Furthermore, an annular groove is provided on the outer wall of the bushing, which cooperates with the inner wall of the large diameter section of the outer ring to form an annular external hydraulic oil channel.

[0019] Furthermore, an annular groove is provided on the inner wall of the bushing, which cooperates with the outer wall of the small diameter section of the inner ring to form an annular inner hydraulic oil channel.

[0020] Furthermore, the sealing plug is a urethane sealing plug.

[0021] Furthermore, the outer diameter of the outer ring is equal to the outer diameter of the large diameter section of the inner ring.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. This utility model proposes an adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser. It improves the existing tensioning sleeve structure and optimizes it to a surface contact design. This significantly enhances the clamping force generated by the tensioning sleeve under the action of hydraulic pressure and maintains its long-term effectiveness. This not only solves the problems of internal slippage and reduced clamping force caused by long-term use of existing tensioning sleeves, but also significantly reduces the cost of frequent replacement of expensive components.

[0024] 2. The utility model proposes an adjustable hydraulic tensioning device for the grinding wheel shaft of the gear grinding machine dresser. It has a wide range of applicability and can be adapted to any similar mechanical equipment with strict requirements on the tensioning of the inner and outer rings. It provides the entire industry with a new solution that can ensure the long-term stable operation of the equipment while saving maintenance costs. With its superior performance improvement and economic advantages, it will bring significant technological progress and economic benefits to gear grinding machines and related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The utility model is a cross-sectional structural diagram of an adjustable hydraulic tensioning device for a grinding wheel shaft of a gear grinding machine dresser.

[0026] Description of reference numerals:

[0027] 1-outer ring; 2-bushing; 3-inner ring; 4-seal; 5-sealing plug; 6-top screw. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] An adjustable hydraulic tensioning device for the grinding wheel shaft of a gear grinding machine dresser comprises an outer ring 1, a bushing 2 and an inner ring 3. Both the outer ring 1 and the inner ring 3 have a stepped structure and are divided into a large diameter section and a small diameter section. The outer diameter of the large diameter section of the inner ring 3 is equal to the outer diameter of the outer ring 1. A positioning hole is also provided on the small diameter section of the outer ring 1.

[0030] The small diameter section of the inner ring 3 is sleeved inside the outer ring 1 and abuts against the inner wall of the small diameter section of the outer ring 1; the inner end surface of the large diameter section of the inner ring 3 abuts against the end of the large diameter section of the outer ring 1; thereby forming an annular area between the outer ring 1 and the inner ring 3, in which the bushing 2 is installed; the inner wall of the bushing 2 abuts against the outer wall of the small diameter section of the inner ring 3, and the outer wall of the bushing 2 abuts against the inner wall of the large diameter section of the outer ring 1; the outer ring 1, bushing 2 and inner ring 3 are connected by brazing to ensure that these core components have high connection strength and stability;

[0031] An annular groove is provided on the outer wall of the small-diameter section of the inner ring 3, which cooperates with the inner wall of the bushing 2 to form an annular inner hydraulic oil channel; an annular groove is provided on the inner wall of the large-diameter section of the outer ring 1, which cooperates with the outer wall of the bushing 2 to form an annular outer hydraulic oil channel; a cylindrical oil storage cavity is provided axially on the bushing 2, and an oil channel is provided radially on the bushing 2 to connect the oil storage cavity with the hydraulic oil channel, and the connecting area is filled with hydraulic oil;

[0032] A threaded hole is axially formed on the large diameter section of the inner ring 3 at a position corresponding to the oil storage cavity on the bushing 2; a top screw 6 is provided on the threaded hole;

[0033] The oil storage cavity on the bushing 2 is also provided with a seal 4 that abuts against the inner wall of the oil storage cavity. The outer end of the seal 4 abuts against the top of the top screw 6. The other end of the seal 4 is also provided with a sealing plug 5 that abuts against the seal 4. The sealing plug 5 is a polyurethane sealing plug, so that the connecting area is a closed area in the weld body to prevent the hydraulic oil from leaking during operation.

[0034] In actual application, by rotating the top screw 6, the seal 4 and the urethane sealing plug 5 are pushed to move smoothly along the axial direction in the oil storage cavity, and the hydraulic oil in the oil storage cavity is pushed into the hydraulic oil channel between the bushing 2 and the outer ring 1 and the inner ring 3. The pressure of the hydraulic oil on the outer ring 1 and the inner ring 3 is used to accurately control the distance between the outer ring 1 and the inner ring 3, thereby realizing the tension and relaxation between the grinding wheel and the grinding wheel shaft.

[0035] The installation process of the hydraulic tensioning device is as follows: first, the adjustable hydraulic tensioning device for the grinding wheel shaft of the gear grinding machine dresser described in the utility model is sleeved on the grinding wheel shaft provided with a shoulder, so that the locating pin provided on the shoulder of the grinding wheel shaft can be inserted into the locating hole provided on the outer ring. Special attention should be paid to ensure that the top screw 6 faces outward to facilitate manual adjustment of the tensioning degree during installation; secondly, the grinding wheel is smoothly sleeved on the installed hydraulic tensioning device to ensure that the two are tightly fitted, and one side of the grinding wheel abuts against the shoulder on the grinding wheel shaft; finally, by manually rotating the top screw 6, it gradually pushes the internally abutting seal 4 and the urethane sealing plug 5 inward, causing the hydraulic tensioning device to produce radial expansion, thereby achieving firm clamping and tensioning of the grinding wheel, ensuring that the grinding wheel can still maintain a stable and safe working state under high-speed operation.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. For ordinary professional and technical personnel in this field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. An adjustable hydraulic tensioning device for a grinding wheel spindle of a gear grinding machine dresser, comprising an outer ring (1) and an inner ring (3), characterized in that: The outer ring (1) and the inner ring (3) are both stepped structures and are divided into a large diameter section and a small diameter section; the small diameter section of the inner ring (3) is sleeved inside the outer ring (1) and abuts against the inner wall of the small diameter section of the outer ring (1); the inner end surface of the large diameter section of the inner ring (3) abuts against the end of the large diameter section of the outer ring (1); thereby, the outer ring (1) and the inner ring (3) enclose an annular area, and the bushing (2) is installed in the annular area; The inner wall of the bushing (2) abuts against the outer wall of the small diameter section of the inner ring (3), and the outer wall of the bushing (2) abuts against the inner wall of the large diameter section of the outer ring (1); An outer hydraulic oil channel and an inner hydraulic oil channel are respectively provided between the bushing (2) and the outer ring (1) and the inner ring (3); An oil storage cavity is provided on the bushing (2), and oil passages are provided radially on the bushing (2) for connecting the oil storage cavity with an external hydraulic oil passage and an internal hydraulic oil passage, respectively. The oil storage cavity and the connected oil passages are filled with hydraulic oil; a connecting hole is provided on the side of the bushing (2) that abuts against the large-diameter section of the inner ring (3) and is connected to the oil storage cavity; A threaded hole is provided in the axial direction on the large diameter section of the inner ring (3) at a position corresponding to the communicating hole on the bushing (2); a top screw (6) is installed in the threaded hole, and the end of the top screw (6) extends into the communicating hole; The oil storage cavity on the bushing (2) is provided with a sealing member (4) which is adapted to the radial cross-sectional shape of the oil storage cavity and whose outer wall abuts against the inner wall of the oil storage cavity. The outer end of the sealing member (4) abuts against the top end of the top screw (6).

2. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 1, characterized in that: A sealing plug (5) is also installed in the communicating hole, and the sealing member (4) abuts against the top end of the top screw (6) through the sealing plug (5).

3. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 1, characterized in that: The oil storage cavity is a cylindrical cavity arranged along the axial direction, and the diameter of the communicating hole is equal to the diameter of the cylindrical cavity.

4. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 1, characterized in that: An annular groove is provided on the outer wall of the small diameter section of the inner ring (3), and cooperates with the inner wall of the bushing (2) to form an annular inner hydraulic oil channel.

5. An adjustable hydraulic tensioning device for a grinding wheel spindle of a gear grinding machine dresser according to any one of claims 1 to 4, characterized in that: An annular groove is provided on the inner wall of the large diameter section of the outer ring (1), and cooperates with the outer wall of the bushing (2) to form an annular external hydraulic oil channel.

6. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 1, characterized in that: An annular groove is provided on the outer wall of the bushing (2), which cooperates with the inner wall of the large diameter section of the outer ring (1) to form an annular external hydraulic oil channel.

7. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 6, characterized in that: An annular groove is provided on the inner wall of the bushing (2), which cooperates with the outer wall of the small diameter section of the inner ring (3) to form an annular inner hydraulic oil channel.

8. The adjustable hydraulic tensioning device for the grinding wheel spindle of a gear grinding machine dresser according to claim 2, characterized in that: The sealing plug (5) is a polyurethane sealing plug.

9. The adjustable hydraulic tensioning device for a grinding wheel spindle of a gear grinding machine dresser according to claim 1, characterized in that: The outer diameter of the outer ring (1) is equal to the outer diameter of the large diameter section of the inner ring (3).

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