A propeller hub tightness adjustment device

Abstract

The present invention discloses a propeller hub tightness adjustment device, which includes a tightness adjustment nut, a tightness adjustment sleeve, a thrust roller bearing, a bearing washer, a locking bushing, a locking sleeve, a locking spring and a locking pin; the upper end surface of the bearing washer abuts against the corresponding surface of the hub, the lower end surface of the first shoulder on the tightness adjustment nut abuts against the corresponding surface of the propeller housing, and the tightness adjustment nut presses the hub through the tightness adjustment sleeve, the thrust roller bearing and the bearing washer; the locking bushing is installed and fixed through the tightness adjustment sleeve; the locking spring is installed between the locking sleeve and the limiting member, and can press the locking sleeve into the tightness adjustment sleeve and fix it. The present invention provides a structure with relatively simple structure, convenient installation and disassembly, and adjustable hub tightness, so that the rotational torque of the hub meets the requirements, can ensure the use function of the propeller, and enables the propeller to work normally.

Description

Technical Field

[0001] The present invention relates to the technical field of propellers, and in particular, to a device for adjusting the tightness of a propeller hub sleeve. Background Art

[0002] The propeller hub sleeve and the propeller blade rotate circumferentially around the propeller blade axis within the propeller sleeve of the propeller housing. Between the propeller housing and the hub sleeve, the raceways on the hub sleeve, the raceways on the propeller housing, and the steel balls act as bearings. In order to control the rotational torque of the hub sleeve, a device for adjusting the tightness of the hub sleeve is also required to adjust the tightness of the hub sleeve.

[0003] Currently, the existing devices for adjusting the tightness of the hub sleeve are all arranged outside the hub sleeve, which have defects such as occupying external space and being prone to corrosion. Therefore, it is necessary to improve the existing devices for adjusting the tightness of the hub sleeve to overcome the above technical problems. Summary of the Invention

[0004] In view of this, the present invention provides a device for adjusting the tightness of a propeller hub sleeve, and its specific technical solution is as follows:

[0005] A propeller hub tightness adjustment device is installed between the hub and the hub shell. A propeller blade is installed on the hub, and the hub makes a circumferential rotary motion around the axis of the propeller blade within the hub shell. The propeller hub tightness adjustment device includes a tightness adjustment nut, a tightness adjustment sleeve, a thrust roller bearing, a bearing washer, a locking bush, a locking sleeve, a locking spring, and a locking pin. The tightness adjustment nut includes a first hollow cylinder. The upper edge of the first hollow cylinder is provided with a first shoulder, and several grooves evenly distributed along the circumference are formed on the lower end surface. The lower end surface of the first shoulder abuts against the corresponding surface on the hub shell. The first hollow cylinder extends into the corresponding hole of the hub shell and is fixedly connected to the hub shell. An internal thread is provided in the inner hole of the first hollow cylinder. The tightness adjustment sleeve includes a second hollow cylinder. The upper edge of the second hollow cylinder is provided with a second shoulder. An external thread that matches the internal thread on the first hollow cylinder is provided on the outer cylindrical surface of the second hollow cylinder. The thrust roller bearing is arranged above the second shoulder, and the bearing washer is arranged above the thrust roller bearing. The upper end surface of the bearing washer abuts against the corresponding surface of the hub. The locking bush passes through the bearing washer and the thrust roller bearing and is supported by an annular rib provided in the inner hole of the tightness adjustment sleeve. The locking sleeve includes a sleeve body. A third shoulder is integrally connected to the lower end of the sleeve body. Several convex teeth evenly distributed along the circumference are formed on the outer peripheral surface of the third shoulder. The convex teeth cooperate with the grooves on the first hollow cylinder. Several side holes are provided in the circumferential direction at the connection between the third shoulder and the sleeve body. The sleeve body extends into the tightness adjustment sleeve. The locking pin is installed in the inner holes of the locking bush and the sleeve body. A end cap is provided at the top of the locking pin. The lower end surface of the end cap abuts tightly against the upper end surface of the locking bush through surface contact. A locking spring is sleeved on the outer cylindrical surface of the locking pin. One end of the locking spring tightly abuts against the inner end surface of the top of the sleeve body, and the other end is tightly abutted by a limiting member detachably connected to the bottom of the locking pin. The locking spring is in a compressed state after installation.

[0006] By adopting the above technical solution, the present invention provides a structure with relatively simple structure, convenient installation and disassembly, and adjustable hub tightness, so that the rotary torque of the hub meets the requirements, can ensure the use function of the propeller, and enables the propeller to work normally.

[0007] At the same time, compared with the device installed outside the hub, the device of the present invention is installed inside, which saves more space, is less prone to corrosion, and reduces the redundancy of the external structure.

[0008] Preferably, both the internal thread and the external thread are trapezoidal threads with a trapezoidal cross-section.

[0009] Preferably, a semi-circular tightness positioning pin mounting hole is provided on the outer peripheral surface of the first hollow cylinder, and the first hollow cylinder is circumferentially connected and fixed to the propeller housing through a tightness positioning pin placed in the tightness positioning pin mounting hole.

[0010] Preferably, the limiting member is a cross washer, a rectangular block is vertically fixed at the bottom of the locking pin, two square holes perpendicular to each other and communicating with each other are provided at the upper and lower positions in the cross washer, and the rectangular block can cooperate with the upper and lower two square holes in the cross washer to realize the clamping and disassembly of the cross washer on the locking pin.

[0011] Preferably, the outer wall of the sleeve body and the inner wall of the tightness adjustment sleeve are circumferentially fixed through spline connection. The inner wall of the tightness adjustment sleeve is provided with inner sleeve teeth, and the outer cylindrical surface of the sleeve body is provided with outer sleeve teeth that cooperate with the inner sleeve teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0013] Figure 1 It is an exploded view of a propeller sleeve tightness adjustment device of the present invention.

[0014] Figures 2-3 It is an overall view of a propeller sleeve tightness adjustment device of the present invention.

[0015] Figure 4 It is a cross-sectional schematic view of a propeller sleeve tightness adjustment device of the present invention.

[0016] Figures 5-6 It is an installation cross-sectional schematic view of a propeller sleeve tightness adjustment device of the present invention.

[0017] Figure 7 It is an axonometric view of the locking sleeve in the present invention.

[0018] In the figure: 1 - tightness adjustment nut, 2 - tightness adjustment sleeve, 3 - thrust roller bearing, 4 - bearing washer, 5 - locking bushing, 6 - locking sleeve, 7 - locking spring, 8 - locking pin, 9 - cross washer, 10 - tightness positioning pin, 11 - propeller sleeve, 12 - propeller housing, 13 - groove, 14 - convex tooth, 15 - side hole, 16 - end cap, 17 - tightness positioning pin mounting hole, 18 - rectangular block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment:

[0021] As Figures 1-7 shown, a propeller hub tightness adjustment device of the present invention is installed between the hub 11 and the hub shell 12. The hub 11 is installed with blades by means of threads or the like, and the hub 11 makes a circumferential rotational movement around the blade axis within the hub shell 12.

[0022] Specifically, as Figure 5 、 Figure 6 shown, between the hub 11 and the hub shell 12, the raceways on the hub 11, the raceways on the hub shell 12 and the steel balls play the role of bearings.

[0023] The propeller hub tightness adjustment device includes a tightness adjustment nut 1, a tightness adjustment sleeve 2, a thrust roller bearing 3, a bearing washer 4, a locking bushing 5, a locking sleeve 6, a locking spring 7, and a locking pin 8.

[0024] The tightness adjustment nut 1 includes a first hollow cylinder. The upper edge of the first hollow cylinder is provided with a first shoulder, and several grooves 13 evenly distributed along the circumference are opened on the lower end face; the lower end face of the first shoulder abuts against the corresponding surface on the hub shell 12 (i.e., Figure 5 the F surface of the hub shell in

[0025] ); the first hollow cylinder extends into the corresponding hole of the hub shell 12 and is fixedly connected to the hub shell 12. Specifically, a semi-circular tightness positioning pin mounting hole 17 is provided on the outer peripheral surface of the first hollow cylinder, and the first hollow cylinder is fixedly connected to the hub shell 12 in the circumferential direction through a tightness positioning pin 10 placed in the tightness positioning pin mounting hole 17.

[0026] The inner thread and the outer thread in the above are preferably trapezoidal threads with a trapezoidal cross-sectional shape. The trapezoidal thread can ensure a better tolerance gap for the connection. At the same time, the inner and outer threads are tightly attached to each other with a tapered surface and are not easy to loosen. The process is good, the root strength is high, and the centering is good.

[0027] The thrust roller bearing 3 is provided above the second shoulder, and the bearing washer 4 is provided above the thrust roller bearing 3. The upper end surface of the bearing washer 4 abuts against the corresponding surface of the paddle sleeve 11 (i.e., Figure 5 the E surface of the paddle sleeve in

[0028] In other words, the tightening nut 1 presses the paddle sleeve 11 through the tightening sleeve 2, the thrust roller bearing 3 and the bearing washer 4.

[0029] The locking bushing 5 passes through the bearing washer 4 and the thrust roller bearing 3 and is supported by the annular flange provided in the inner hole of the tightening sleeve 2; the locking sleeve 6 includes a sleeve body, and a third shoulder is integrally connected to the lower end of the sleeve body. A plurality of convex teeth 14 are evenly distributed along the circumference on the outer peripheral surface of the third shoulder. The convex teeth 14 cooperate with the groove 13 on the first hollow cylinder, that is, the convex teeth 14 of the locking sleeve 6 can be adaptively snapped into the groove 13 on the tightening nut 1.

[0030] The sleeve body extends into the tightening sleeve 2. Further, the sleeve body and the inner wall of the tightening sleeve 2 are circumferentially fixed by spline connection. The inner wall of the tightening sleeve 2 is provided with inner spline teeth, and the outer cylindrical surface of the sleeve body is provided with outer spline teeth that cooperate with the inner spline teeth.

[0031] The locking pin 8 is installed in the inner holes of the locking bushing 5 and the sleeve body. The top end of the locking pin 8 is provided with an end cap 16. The lower end surface of the end cap 16 abuts against the upper end surface of the locking bushing 5 by surface contact. A locking spring 7 is sleeved on the outer cylindrical surface of the locking pin 8. The locking spring 7 is wound with a wire. One end of the locking spring 7 abuts tightly against the inner end surface of the top of the sleeve body, and the other end is tightly abutted by a limiting member detachably connected to the bottom of the locking pin 8. The locking spring 7 is in a compressed state after installation.

[0032] The locking pin 8 cooperates with the locking spring 7 and the limiting member, that is, the locking spring 7 is installed between the locking sleeve 6 and the limiting member, and can press the locking sleeve 6 into the tightening sleeve 2 and fix it to prevent the locking sleeve 6 from falling off from the tightening sleeve 2.

[0033] In this embodiment, the limiting member is preferably a cross washer 9. A rectangular block 18 is vertically fixed to the bottom of the locking pin 8. Two perpendicular and communicating square holes are provided at the upper and lower positions in the cross washer 9. The rectangular block 18 can cooperate with the upper and lower square holes in the cross washer 9 to realize the clamping and disassembly of the cross washer 9 on the locking pin 8.

[0034] The working process of the present invention:

[0035] When assembling the paddle sleeve 11 into the hub, after installing steel balls into the raceway grooves of the paddle sleeves on the paddle sleeve 11 and the paddle housing 12, the paddle sleeve 11 is pressed tightly towards the end face direction of the paddle sleeve, and the tightness is achieved by screwing out the tightness adjustment sleeve 2 from the tightness adjustment nut 1.

[0036] To achieve the specified tightness, the locking sleeve 6 must be removed first. For this purpose, gently press down the cross washer 9 and the locking spring 7, rotate the cross washer 9 by 90°, and then remove the cross washer 9 and the locking spring 7 from the locking pin 8. At this time, use a small hook to insert through the hollow cavity on the paddle housing 12 into the side hole 15 of the locking sleeve 6 to remove the locking sleeve 6. After the locking sleeve 6 is removed, install a special wrench at the position where the locking sleeve 6 was removed, and use this special wrench to tighten the tightness adjustment sleeve 2. When the tightness adjustment sleeve 2 rotates one circle, the paddle sleeve 11 moves 3 mm.

[0037] When the paddle sleeve 11 reaches the required tightness, reinstall the locking sleeve 6, install the locking spring 7 and the cross washer 9 on the locking pin 8, press the locking sleeve 6 into the tightness adjustment sleeve 2 and fix it. To further prevent the tightness adjustment sleeve 2 from disengaging from the tightness adjustment nut 1, the tightness adjustment sleeve 2 is secured by the locking sleeve 6. Insert the outer teeth of the locking sleeve 6 into the inner teeth of the tightness adjustment sleeve 2, and install the convex teeth 14 of the locking sleeve 6 in the end face groove 13 of the tightness adjustment nut 1.

[0038] Tightness positioning pin installation holes 17 are provided in both the tightness adjustment nut 1 and the paddle housing 12, and the tightness adjustment nut 1 is fixed to the paddle housing 12 with the tightness positioning pin 10.

[0039] The structure of the present invention is relatively simple, convenient for installation and disassembly, capable of adjusting the tightness of the paddle sleeve 11, controlling the rotational torque of the paddle sleeve 11 within the specified range, and enabling the propeller to work properly.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A propeller hub tightness adjustment device is installed between a hub (11) and a hub shell (12). Blades are installed on the hub (11), and the hub (11) makes a circumferential rotary motion around the blade axis within the hub shell (12); characterized in that, The propeller hub tightness adjustment device includes a tightness adjustment nut (1), a tightness adjustment sleeve (2), a thrust roller bearing (3), a bearing washer (4), a locking bushing (5), a locking sleeve (6), a locking spring (7) and a locking pin (8); the tightness adjustment nut (1) includes a first hollow cylinder, the upper edge of the first hollow cylinder is provided with a first shoulder, and several grooves (13) evenly distributed along the circumference are opened on the lower end surface; the lower end surface of the first shoulder abuts against the corresponding surface on the propeller housing (12), the first hollow cylinder extends into the corresponding hole in the propeller housing (12) and is fixedly connected to the propeller housing (12), and an internal thread is provided in the inner hole of the first hollow cylinder; the tightness adjustment sleeve (2) includes a second hollow cylinder, the upper edge of the second hollow cylinder is provided with a second shoulder, and an external thread matching the internal thread on the first hollow cylinder is provided on the outer cylindrical surface of the second hollow cylinder, the thrust roller bearing (3) is arranged above the second shoulder, the bearing washer (4) is arranged above the thrust roller bearing (3), and the upper end surface of the bearing washer (4) abuts against the corresponding surface of the hub (11); the locking bushing (5) passes through the bearing washer (4) and the thrust roller bearing (3) and is supported by a ring-shaped rib provided in the inner hole of the tightness adjustment sleeve (2); the locking sleeve (6) includes a sleeve body, a third shoulder is integrally connected to the lower end of the sleeve body, several convex teeth (14) evenly distributed along the circumference are opened on the outer peripheral surface of the third shoulder, and the convex teeth (14) cooperate with the grooves (13) on the first hollow cylinder; several side holes (15) are provided in the circumferential direction at the connection between the third shoulder and the sleeve body, and the sleeve body extends into the tightness adjustment sleeve (2); the locking pin (8) is installed in the inner holes of the locking bushing (5) and the sleeve body, a end cap (16) is provided at the top end of the locking pin (8), the lower end surface of the end cap (16) abuts tightly against the upper end surface of the locking bushing (5) by surface contact, a locking spring (7) is sleeved on the outer cylindrical surface of the locking pin (8), one end of the locking spring (7) tightly abuts against the inner end surface of the top of the sleeve body, and the other end is tightly abutted by a limiting member detachably connected to the bottom of the locking pin (8), and the locking spring (7) is in a compressed state after installation.

2. The propeller hub tightness adjustment device according to claim 1, characterized in that, Both the internal thread and the external thread are trapezoidal threads with a trapezoidal cross-section.

3. The propeller hub tightness adjustment device according to claim 1, characterized in that, A semi-circular tightness positioning pin installation hole (17) is provided on the outer peripheral surface of the first hollow cylinder, and the first hollow cylinder is circumferentially connected and fixed to the propeller housing (12) through a tightness positioning pin (10) placed in the tightness positioning pin installation hole (17).

4. A propeller hub tightness adjustment device according to claim 1, characterized in that, The limiting member is a cross washer (9). A rectangular block (18) is vertically fixed to the bottom of the locking pin (8). Two perpendicular and communicating square holes are provided at the upper and lower positions inside the cross washer (9). The rectangular block (18) can cooperate with the upper and lower square holes inside the cross washer (9) to realize the clamping and disassembly of the cross washer (9) on the locking pin (8).

5. A propeller hub tightness adjustment device according to claim 1, characterized in that, The sleeve body is circumferentially fixed to the inner wall of the tightness adjustment sleeve (2) through spline connection. The inner wall of the tightness adjustment sleeve (2) is provided with inner sleeve teeth, and the outer cylindrical surface of the sleeve body is provided with outer sleeve teeth that cooperate with the inner sleeve teeth.

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