Hobbing tool for improving precision of step inner hole gear

Abstract

The utility model discloses a hobbing tool for improving the precision of a step inner hole gear, and relates to the technical field of gear machining. Comprising a containing assembly, the containing assembly is composed of a mounting base, a containing table, a circular truncated cone and a threaded column, the outer surface of the top of the containing assembly is sequentially sleeved with a gear hobbing expansion sleeve and a gasket, the containing table and the mounting base are in running fit, and a nut is in threaded connection with the outer surface of the threaded column and used for fixing the gear hobbing expansion sleeve and the gasket. The placing table is used for placing a stepped inner hole gear, and a mounting disc is mounted at the bottom of the outer surface of the placing table. The step inner hole gear is sleeved on the hobbing expansion sleeve, then the nut is screwed, and the vertical force generated by the nut is converted into the horizontal expansion force through the taper of the hobbing expansion sleeve and the taper of the circular truncated cone, so that the step inner hole gear is in close contact with the hobbing expansion sleeve, and a gap is eliminated; the problems caused by a gear hobbing mandrel with a fixed diameter value are solved, the centering effect of a tool is improved, and the gear hobbing precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear machining technical field, concretely is a kind of hobbing tool for improving the precision of stepped bore gear. BACKGROUND

[0002] Stepped bore gear is a kind of stepped bore gear, its structural features are that multiple steps are designed in inner hole part, the diameter of each step is different, and it is widely used in various mechanical transmission systems, especially in occasions requiring high precision and high reliability.

[0003] The stepped bore gear is often used in the fixed diameter value hobbing arbor in the machining process, and is pressed after being matched with the inner hole, but because it is fixed value arbor, there is gap between the inner hole of stepped bore gear and arbor, so that the centering effect of tooling is not good, thereby affecting the gear precision of product. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of hobbing tool for improving the precision of stepped bore gear to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of hobbing tool for improving the precision of stepped bore gear, including placement assembly, the placement assembly is by installation base, placement table, circular table and threaded column composition, and the top outer surface of placement assembly is successively equipped with hobbing expansion sleeve and gasket, and placement table is rotationally cooperated with installation base, the outer surface of threaded column is screwed with nut, and nut is used to fixed hobbing expansion sleeve and gasket, the placement table is used to place stepped bore gear, and the outer surface bottom of placement table is equipped with mounting disc, the top outer surface of mounting disc is equipped with lower pressure assembly, and the lower pressure end of lower pressure assembly is slidably cooperated with threaded column, and lower pressure assembly is used to lower pressure positioning stepped bore gear, the top outer surface of mounting disc is equipped with rotating assembly, and rotating assembly is fixedly connected with placement table, and rotating assembly is used to drive placement table to rotate.

[0006] Further, the top outer surface of placement assembly is equipped with circular groove, and the inside of circular groove is connected with connecting shaft through bearing, and the top end of connecting shaft is fixedly connected with placement table, and circular table is welded on the top outer surface of placement table, and threaded column is welded on the top outer surface of circular table.

[0007] Further, the top outer surface and bottom outer surface of hobbing expansion sleeve are all equipped with three equidistant annular distribution expansion holes, and the whole of hobbing expansion sleeve is annular, and the inside of hobbing expansion sleeve is circular table shape.

[0008] Further, the lower pressing assembly comprises a housing fixed to the top outer surface of the mounting disc, a servo motor is installed in the housing, an output shaft of the servo motor penetrates through the housing and is connected with a connecting disc, a cylinder is installed on the top outer surface of the connecting disc, a connecting column is installed on the top end of the piston rod of the cylinder, a connecting sleeve is installed on one end of the connecting column, and a hobbing sleeve is installed on the bottom outer surface of the connecting sleeve and is in sliding fit with the outer surface of the threaded column.

[0009] Further, the rotating assembly comprises an annular sliding table fixedly connected to the top outer surface of the mounting disc, an L-shaped column is installed on the top outer surface of the sliding part of the annular sliding table, and an installation ring is installed on the top end of the L-shaped column and is fixedly connected to the placing table through bolts.

[0010] Further, the hobbing sleeve and the gasket are located in the interior of the hobbing sleeve, and the placing table is located in the interior of the annular sliding table.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] The utility model discloses a hobbing tool for improving the precision of stepped inner hole gear, the stepped inner hole gear is sleeved on the hobbing sleeve, then the nut is screwed, the vertical force of the nut is converted into the horizontal expansion force through the taper of the hobbing sleeve and the taper of the circular table, the stepped inner hole gear is in close contact with the hobbing sleeve, and the gap is eliminated, the problem caused by the fixed diameter value of the hobbing mandrel is solved, the centering effect of the tool is improved, and the hobbing precision is ensured.

[0013] Meanwhile, the lower pressing assembly can drive the hobbing sleeve to move up and down, thereby the placed stepped inner hole gear can be pressed tightly, manual operation is not needed to press the stepped inner hole gear, the hobbing sleeve can be driven to rotate and adjust the position, the stepped inner hole gear is prevented from being hindered when being taken, the annular sliding table, the L-shaped column and the installation ring can drive the placing table to rotate, thereby the stepped inner hole gear is driven to rotate, and different machining requirements can be met. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of the main structure of the utility model;

[0015] Figure 2 It is a schematic view of the placing assembly, the hobbing sleeve and the gasket structure of the utility model;

[0016] Figure 3 It is a schematic view of the main structure of the placing assembly of the utility model;

[0017] Figure 4 It is a sectional structure schematic view of the hobbing sleeve of the utility model;

[0018] Figure 5The utility model discloses a hobbing expansion sleeve structure schematic diagram.

[0019] In the drawing: 1, mounting base; 2, placing table; 3, round table; 4, threaded column; 5, hobbing expansion sleeve; 51, expansion hole; 6, gasket; 7, hobbing gland; 8, mounting disc; 9, setting cover; 10, air cylinder; 11, connecting column; 12, connecting sleeve; 13, annular slide table; 14, L-shaped column; 15, mounting ring. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the utility model.

[0021] The hobbing tool for improving the precision of stepped inner hole gear can significantly improve the poor centering effect in the traditional machining method, can realize the accurate adaptation and compression of the inner hole of the stepped inner hole gear, improve the machining precision of the gear, and enhance the stability and reliability of the tool, so that the stepped inner hole gear is more widely and reliably applied in various mechanical transmission systems. In the traditional machining method, the hobbing mandrel with a fixed diameter value is used to compress the inner hole of the stepped inner hole gear. Due to the gap between the mandrel and the inner hole, the centering effect of the tool is poor, which affects the gear precision. After the utility model is introduced, the adjustable hobbing expansion sleeve and gasket combination, and the lower pressing assembly and rotating assembly for accurately rotating the placing table are adopted, so that the accurate adaptation and compression of the inner hole of the stepped inner hole gear are realized.

[0022] As Figures 1-5 shown, the utility model provides a technical scheme: a hobbing tool for improving the precision of stepped inner hole gear, including placing assembly, placing assembly is by mounting base 1, placing table 2, round table 3 and threaded column 4 are formed, and the top outer surface of placing assembly is sequentially equipped with hobbing expansion sleeve 5 and gasket 6, and placing table 2 and mounting base 1 form rotating cooperation, and the outer surface of threaded column 4 is screwed with nut, and the nut is used for fixing hobbing expansion sleeve 5 and gasket 6, and placing table 2 is used to place stepped inner hole gear, and the outer surface bottom of placing table 2 is equipped with mounting disc 8, and the top outer surface of mounting disc 8 is equipped with lower pressing assembly, and the lower pressing end of lower pressing assembly forms sliding cooperation with threaded column 4, and lower pressing assembly is used to lower positioning for stepped inner hole gear, and the top outer surface of mounting disc 8 is equipped with rotating assembly, and rotating assembly is fixedly connected with placing table 2, and rotating assembly is used to drive placing table 2 to rotate.

[0023] It should be noted that the hobbing expansion sleeve 5 has good elasticity and wear resistance to ensure that it can tightly fit in the inner hole of the stepped bore gear during hobbing, while avoiding damage to the stepped bore gear. The nut needs to be tightened after the stepped bore gear is sleeved on the hobbing expansion sleeve 5.

[0024] As shown in Figures 1-3 The top outer surface of the placement assembly is provided with a circular groove, and the inside of the circular groove is connected with a connecting shaft through a bearing, and the top end of the connecting shaft is fixedly connected with the placement table 2. The circular table 3 is welded to the top outer surface of the placement table 2, and the threaded column 4 is welded to the top outer surface of the circular table 3.

[0025] It should be noted that the placement of the connecting shaft allows the placement table 2 to rotate, thereby allowing the stepped bore gear to rotate and cooperate with the hobbing machine for processing.

[0026] As shown in Figure 2 and Figure 5 The top outer surface and the bottom outer surface of the hobbing expansion sleeve 5 are provided with three equally spaced annular expansion holes 51. The hobbing expansion sleeve 5 is annular, and the inside of the hobbing expansion sleeve 5 is circular.

[0027] It should be noted that the hobbing expansion sleeve 5 needs to withstand a large clamping force and torque, so an alloy steel material can be selected.

[0028] As shown in Figure 1 The lower pressing assembly includes a placement cover 9 fixed to the top outer surface of the mounting disc 8, and a servo motor is installed in the inside of the placement cover 9. The output shaft of the servo motor penetrates the placement cover 9 and is installed with a connecting disc. The top outer surface of the connecting disc is installed with a gas cylinder 10, and the top end of the piston rod of the gas cylinder 10 is installed with a connecting column 11. One end of the connecting column 11 is installed with a connecting sleeve 12, and the bottom outer surface of the connecting sleeve 12 is installed with a hobbing gland 7. The connecting sleeve 12 and the hobbing gland 7 are in sliding fit with the outer surface of the threaded column 4.

[0029] It should be noted that the operation of the servo motor can make the hobbing gland 7 away from the placement assembly, and the operation of the gas cylinder 10 can drive the hobbing gland 7 to move up and down. The hobbing gland 7 can press and position the stepped bore gear.

[0030] As shown in Figure 1 The rotating assembly includes an annular sliding table 13 fixedly connected to the top outer surface of the mounting disc 8. The top outer surface of the sliding member of the annular sliding table 13 is installed with an L-shaped column 14, and the top end of the L-shaped column 14 is installed with a mounting ring 15 fixedly connected with the placement table 2 through bolts.

[0031] It should be noted that since the placement table 2 is rotatable, the rotating assembly can drive the placement table 2 to rotate. The mounting ring 15 and the L-shaped column 14 can be connected together through bolts, which is convenient for subsequent disassembly and maintenance.

[0032] As Figure 1 shown, the hobbing sleeve 5 and the gasket 6 are located inside the hobbing gland 7, and the placement platform 2 is located inside the annular sliding platform 13.

[0033] It should be noted that after the machining is completed, the loose nut can take the machined stepped inner hole gear, and the subsequent hobbing sleeve 5 and gasket 6 do not need to be disassembled, which is convenient for the next stepped inner hole gear.

[0034] Working principle: when in use, the stepped inner hole gear is sleeved on the hobbing sleeve 5, and then the nut is tightened, so that the vertical force generated by the nut is converted into horizontal expansion force through the taper of the hobbing sleeve 5 and the taper of the circular platform 3, so that the stepped inner hole gear is in close contact with the hobbing sleeve 5, and the gap is eliminated, then the lower assembly drives the roller gland 7 to be sleeved on the threaded column 4 to press and position the placed stepped inner hole gear, and in the machining process, the annular sliding platform 13 cooperates with the L-shaped column 14 and the mounting ring 15 to drive the placement platform 2 to rotate, thereby driving the stepped inner hole gear to rotate, meeting different machining requirements.

[0035] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended embodiments and their equivalents.

Claims

1. A hobbing tool for improving the accuracy of a stepped bore gear comprising a placement assembly, characterized in that: The placing assembly is composed of a mounting base (1), a placing table (2), a circular table (3) and a threaded column (4), and the top outer surface of the placing assembly is sequentially sleeved with a gear rolling expansion sleeve (5) and a gasket (6), the placing table (2) is rotationally connected with the mounting base (1), the outer surface of the threaded column (4) is screwed with a nut, the nut is used for fixing the gear rolling expansion sleeve (5) and the gasket (6), the placing table (2) is used for placing a stepped bore gear, and the bottom outer surface of the placing table (2) is provided with a mounting disc (8), and the top outer surface of the mounting disc (8) is provided with a pressing assembly, the pressing end of the pressing assembly is slidably connected with the threaded column (4), and the pressing assembly is used for pressing and positioning the stepped bore gear, and the top outer surface of the mounting disc (8) is provided with a rotating assembly, the rotating assembly is fixedly connected with the placing table (2), and the rotating assembly is used for driving the placing table (2) to rotate.

2. The hobbing tool for improving the accuracy of a stepped bore gear according to claim 1, wherein: The top outer surface of the placing assembly is provided with a circular groove, the inside of the circular groove is connected with a connecting shaft through a bearing, the top end of the connecting shaft is fixedly connected with the placing table (2), the circular table (3) is welded on the top outer surface of the placing table (2), and the threaded column (4) is welded on the top outer surface of the circular table (3).

3. The hobbing tool for improving the accuracy of a stepped bore gear according to claim 1, wherein: The top outer surface and the bottom outer surface of the gear rolling expansion sleeve (5) are provided with three equidistant annular expansion holes (51), the gear rolling expansion sleeve (5) is annular as a whole, and the inside of the gear rolling expansion sleeve (5) is circular table-shaped.

4. The hobbing tool for improving the accuracy of a stepped bore gear according to claim 1, wherein: The pressing assembly comprises a housing (9) fixed on the top outer surface of the mounting disc (8), a servo motor installed in the housing (9), a connecting disc installed on the output shaft of the servo motor and penetrating through the housing (9), a pneumatic cylinder (10) installed on the top outer surface of the connecting disc, a connecting column (11) installed on the top end of the piston rod of the pneumatic cylinder (10), a connecting sleeve (12) installed on one end of the connecting column (11), a gear rolling cover (7) installed on the bottom outer surface of the connecting sleeve (12), and the connecting sleeve (12) and the gear rolling cover (7) are slidably connected with the outer surface of the threaded column (4).

5. The hobbing tool for improving the accuracy of a stepped bore gear according to claim 1, wherein: The rotating assembly comprises an annular sliding table (13) fixedly connected with the top outer surface of the mounting disc (8), an L-shaped column (14) installed on the top outer surface of the sliding member of the annular sliding table (13), an installation ring (15) installed on the top end of the L-shaped column (14), and the installation ring (15) is fixedly connected with the placing table (2) through bolts.

6. The hobbing tool for improving the accuracy of a stepped bore gear according to claim 1, wherein: The gear rolling expansion sleeve (5) and the gasket (6) are located in the inside of the gear rolling cover (7), and the placing table (2) is located in the inside of the annular sliding table (13).

Images