Engine and gear transmission device thereof

Abstract

The utility model discloses an engine and a gear transmission device thereof, the gear transmission device of the engine comprises a gear, a transmission shaft and an elastic telescopic piece, and the gear is sleeved on the periphery of the transmission shaft; clamping teeth are arranged on one of the periphery of the transmission shaft and the inner wall of the gear, a clamping cavity for containing the clamping teeth is formed in the other one, and the transmission shaft can coaxially rotate relative to the gear. The two opposite ends of the elastic telescopic piece in the telescopic direction act on the side wall of the clamping cavity and the first side of the clamping tooth correspondingly. The second side of the latch is used for abutting against the side wall of the clamping chamber; in the rotating direction of the gear, the elastic telescopic piece and the clamping teeth are sequentially arranged in the clamping cavities, and the elastic telescopic piece is located in front of the clamping teeth in the same clamping cavity. As the transmission shaft and the gear are provided with the elastic telescopic piece, the rotating speed increased by the transmission shaft is finally eliminated by the elastic telescopic piece and is not transmitted to the gear, so that back clearance knocking noise generated by the gear and the engine driving gear is avoided, and the noise reduction effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power equipment technical field, especially a kind of engine and its gear transmission device. BACKGROUND

[0002] Engine usually adopts gear transmission to transmit power, for example high-pressure oil pump gear, air compressor gear, camshaft gear.

[0003] However, there is negative torque in high-pressure oil pump gear, air compressor gear, camshaft gear and other power transmission, due to negative torque, driven gear and driving gear backlash knock, knock noise is produced, the traditional way is to reduce gear knock noise by controlling side clearance (such as shear gear), but due to the driving gear and preloaded gear of shear gear are connected by flexible component, the reliability of gear transmission is reduced, at the same time, it is easy to cause gear whine and other problems, still lead to the noise of gear transmission device is larger.

[0004] Therefore, how to reduce the noise of gear transmission device is a technical problem to be solved by the person skilled in the art. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of gear transmission device of engine, the noise of the gear transmission device is reduced.The other purpose of the utility model is to provide a kind of engine comprising above-mentioned gear transmission device.

[0006] The gear transmission device of engine provided in the application comprises:

[0007] Gear;

[0008] Transmission shaft, the gear is sleeved on the outer periphery of the transmission shaft;One of the outer periphery of the transmission shaft and the inner wall of the gear is provided with a tooth, and the other is provided with a clamping chamber accommodating the tooth, and the transmission shaft can rotate coaxially relative to the gear;

[0009] Elastic expansion piece, the opposite ends of the elastic expansion piece in the direction of expansion are respectively applied to the side wall of the clamping chamber and the first side of the tooth;The second side of the tooth is used to abut with the side wall of the clamping chamber;Along the rotation direction of the gear, the elastic expansion piece and the tooth are sequentially arranged in the clamping chamber, and the elastic expansion piece is located in front of the tooth in the same clamping chamber.

[0010] Optionally, in the above-mentioned gear transmission device of engine, the elastic expansion piece is spring;When the gear transmission device is in non-working state, the elastic expansion piece is in natural elongation state or compression state.

[0011] Optionally, in the gear transmission device of the engine, the clamping cavity is a clamping groove arranged on the gear side, and the clamping teeth are arranged on the outer periphery of the transmission shaft.

[0012] Optionally, in the gear transmission device of the engine, the clamping teeth and the transmission shaft are integrally formed.

[0013] Optionally, in the gear transmission device of the engine, the outer peripheral surface of the clamping teeth away from the transmission shaft is arranged separately from the clamping cavity.

[0014] Optionally, in the gear transmission device of the engine, the gear transmission device further comprises a guide sliding assembly arranged in the clamping cavity, the elastic expansion piece is sleeved on the outer periphery of the guide sliding assembly, the guide sliding assembly comprises a first sliding piece and a second sliding piece slidingly matched with the first sliding piece, one of the first sliding piece and the second sliding piece is fixedly connected with the transmission shaft, and the other is fixedly connected with the gear.

[0015] Optionally, in the gear transmission device of the engine, the clamping teeth are sector teeth, and the arc length of the clamping teeth gradually increases away from the transmission shaft.

[0016] Optionally, in the gear transmission device of the engine, the number of the clamping teeth and the clamping cavities is the same and one-to-one correspondence, and the number of the clamping teeth and the clamping cavities is at least two.

[0017] Optionally, in the gear transmission device of the engine, the clamping teeth are arranged at equal intervals in the circumferential direction around the outer periphery of the transmission shaft.

[0018] An engine comprises a gear transmission device, and the gear transmission device is any one of the above-mentioned gear transmission devices.

[0019] In the technical scheme, the gear transmission device of the engine comprises a gear, a transmission shaft and an elastic expansion piece, the gear is sleeved on the outer periphery of the transmission shaft, one of the outer periphery of the transmission shaft and the inner wall of the gear is provided with a clamping tooth, and the other is provided with a clamping cavity accommodating the clamping tooth, and the transmission shaft can rotate coaxially relative to the gear. The opposite ends of the elastic expansion piece in the expansion direction are respectively applied to the side wall of the clamping cavity and the first side of the clamping tooth; the second side of the clamping tooth is used for abutting against the side wall of the clamping cavity; in the rotation direction of the gear, the elastic expansion piece and the clamping tooth are sequentially arranged in the clamping cavity, and the elastic expansion piece is located in front of the clamping tooth in the same clamping cavity. When the gear rotates, the clamping tooth is combined with the clamping cavity, and then the transmission shaft is driven to rotate synchronously; when the rotation speed of the transmission shaft increases greater than the rotation speed of the gear, the clamping tooth is separated from the clamping cavity, the spring is compressed, and then the transmission shaft is compressed and elongated when the rotation speed of the transmission shaft decreases, the clamping tooth is combined with the clamping cavity again, and the transmission shaft and the gear rotate synchronously.

[0020] From the above description, it can be known that in the gear transmission device of the engine provided in the application, when the driven part appears negative torque, the transmission shaft will be accelerated to rotate, but since the transmission shaft and the gear have the elastic expansion part, the increased rotating speed of the transmission shaft is eliminated by the elastic expansion part, and will not be transmitted to the gear, so that the backlash knocking noise of the gear and the engine driving gear will not be caused, so that the noise reduction effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the provided drawings without creative labor.

[0022] Fig. 1 The front view of the gear transmission device provided in the embodiments of the present application;

[0023] Fig. 2 The side view of the gear transmission device provided in the embodiments of the present application;

[0024] Fig. 3 The exploded view of the gear transmission device provided in the embodiments of the present application.

[0025] Among them Figs. 1-3 In the figure: 1-gear, 2-latching, 3-transmission shaft, 4-elastic expansion part, 5-elastic retaining ring, 6-latching chamber. DETAILED DESCRIPTION

[0026] The core of the present application is to provide a gear transmission device of an engine, which reduces noise. Another core of the present application is to provide an engine comprising the above gear transmission device.

[0027] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below in combination with the drawings and embodiments.

[0028] Please refer to Figs. 1 to 3 .

[0029] In one specific embodiment, the gear transmission device of the engine provided in the embodiments of the present application comprises a gear 1, a transmission shaft 3 and an elastic expansion part 4. The gear 1 is sleeved on the outer periphery of the transmission shaft 3, and the transmission shaft 3 and the gear 1 are coaxially arranged. One of the outer periphery of the transmission shaft 3 and the inner wall of the gear 1 is provided with a latching 2, and the other is provided with a latching chamber 6 accommodating the latching 2. For example, the latching chamber 6 is arranged on the transmission shaft 3, and at this time the latching 2 is arranged on the gear 1.

[0030] The transmission shaft 3 can rotate coaxially relative to the gear 1, that is, when the compression elastic member 4 is compressed, the transmission shaft 3 rotates coaxially relative to the gear 1.

[0031] The elastic member 4 and the pawl 2 are sequentially arranged in the clamping chamber 6 in the circumferential direction of the transmission shaft 3. The opposite ends of the elastic member 4 in the extension direction are respectively applied to the side wall of the clamping chamber 6 and the first side of the pawl 2. The second side of the pawl 2 is used to abut against the side wall of the clamping chamber 6. Specifically, in order to facilitate the abutment of the machine pawl 2 and the side wall of the clamping chamber 6, preferably, the pawl 2 and the side wall of the clamping chamber 6 are both flat structures.

[0032] In view of the collision between the pawl 2 and the clamping chamber 6, in order to prolong the service life, preferably, the wall surface abutting against the pawl 2 and the clamping chamber 6 is provided with a wear-resistant layer.

[0033] In the same clamping chamber 6 in the rotation direction of the gear 1, the elastic member 4 is located in front of the pawl 2.

[0034] The elastic member 4 can be a silica gel pad or a rubber pad, or the elastic member 4 is a spring. When the gear transmission device is in a non-working state, the elastic member 4 is in a natural elongation state or a compression state.

[0035] In the specific assembly, the side of the transmission shaft 3 away from the elastic member 4 is connected with the gear 1 through the elastic retainer 5.

[0036] In specific use, the transmission shaft 3 is connected with the shaft system of the driven member, wherein the driven member can be an air compressor, an oil pump, a camshaft, etc. The gear 1 is engaged with other transmission gears 1 of the engine to transmit driving torque.

[0037] When the gear transmission device is working, the gear 1 rotates, the pawl 2 abuts against the clamping chamber 6, thereby driving the transmission shaft 3 to rotate synchronously, the transmission shaft 3 drives the shaft system of the driven member to rotate, and power transmission is realized. When the rotation speed of the transmission shaft 3 increases greater than the rotation speed of the gear 1, the pawl 2 abuts against and separates from the clamping chamber 6, the transmission shaft 3 compresses the spring, and when the rotation speed of the transmission shaft 3 decreases, the compression elongates, the pawl 2 abuts against the clamping chamber 6 again, and the transmission shaft 3 and the gear 1 rotate synchronously.

[0038] As known from the above description, in the gear transmission device of the engine provided in the specific embodiment of the present application, when the driven member appears negative torque, it will drive the transmission shaft 3 to rotate faster, but since the transmission shaft 3 and the gear 1 have the elastic member 4, the increased rotation speed of the transmission shaft 3 is eliminated by the elastic member 4, and will not be transmitted to the gear 1, so as not to cause backlash knocking noise between the gear 1 and the driving gear of the engine, thereby achieving the noise reduction effect.

[0039] In an embodiment, the clamping chamber 6 is a clamping groove arranged on the side of the gear 1, and the clamping teeth 2 are arranged on the outer periphery of the transmission shaft 3, and specifically, the clamping teeth 2 are fixedly connected with the transmission shaft 3 to form a gear shaft.

[0040] In order to improve the assembly efficiency and the installation position accuracy of the clamping teeth 2 on the transmission shaft 3, preferably, the clamping teeth 2 and the transmission shaft 3 are integrally formed. Specifically, the clamping teeth 2 and the transmission shaft 3 can be cast formed.

[0041] In order to facilitate the friction between the transmission shaft 3 and the gear 1, preferably, the outer peripheral surface of the clamping teeth 2 away from the transmission shaft 3 is arranged separately from the clamping chamber 6. As shown in the figure, the outer peripheral arc surface of the clamping teeth 2 is spaced apart from the clamping chamber 6. Specifically, the distance between the outer peripheral surface of the clamping teeth 2 away from the transmission shaft 3 and the clamping chamber 6 is determined according to the needs, and the present application does not make specific limitations.

[0042] In an embodiment, the gear transmission device further comprises a guide sliding assembly located in the clamping chamber 6, and the elastic expansion piece 4 is sleeved on the outer periphery of the guide sliding assembly. The guide sliding assembly comprises a first sliding piece and a second sliding piece slidingly matched with the first sliding piece, one of the first sliding piece and the second sliding piece is fixedly connected with the transmission shaft 3, and the other is fixedly connected with the gear 1. Through the arrangement, the guide sliding assembly enables the elastic expansion piece 4 to expand and contract along a predetermined path.

[0043] One of the first sliding piece and the second sliding piece can be a circular arc column, and the other can be a semicircular arc groove matched with the circular arc column.

[0044] In an embodiment, as shown in the figure, Fig. 1 the clamping teeth 2 are fan-shaped teeth, and the arc length of the clamping teeth 2 gradually increases away from the transmission shaft 3. In the direction of the axis of the transmission shaft 3, the thickness of the clamping teeth 2 can be equal to or less than the thickness of the clamping chamber 6, so as to avoid interference between the clamping teeth 2 and external components.

[0045] On the basis of the above-mentioned schemes, the number of the clamping teeth 2 and the clamping chambers 6 is the same and one-to-one correspondence, and the number of the clamping teeth 2 and the clamping chambers 6 is at least two. Specifically, preferably, the shape of each clamping tooth 2 is the same. Specifically, the number of the clamping teeth 2 and the clamping chambers 6 is preferably greater than or equal to three.

[0046] In order to make the transmission shaft 3 bear force more uniformly, preferably, the clamping teeth 2 are arranged at equal intervals in the circumferential direction around the outer periphery of the transmission shaft 3. For example, when two clamping teeth 2 are arranged, the two clamping teeth 2 can be symmetrically distributed on the opposite sides of the transmission shaft 3, and when four clamping teeth 2 are arranged, the center lines of the four clamping teeth 2 are cross-shapedly distributed.

[0047] The engine provided in the application comprises a gear transmission device, wherein the gear transmission device is any one of the above gear transmission devices.

[0048] The various embodiments are described in the specification with progressive progression, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0049] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. 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 application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gear transmission for an engine, characterized by, The utility model provides a gear transmission device, including; Gear (1); Transmission shaft (3), the gear (1) is sleeved in the outer circumference of transmission shaft (3), one of the outer circumference of transmission shaft (3) and the inner wall of gear (1) is equipped with the latch (2), the other is equipped with the clamping chamber (6) of accommodating the latch (2), and transmission shaft (3) can rotate coaxially relative to gear (1); Elastic telescopic part (4), the opposite ends of the telescopic direction of elastic telescopic part (4) are acted on the side wall of clamping chamber (6) and the first side of latch (2) respectively, the second side of latch (2) is used to abut with the side wall of clamping chamber (6), along the direction of rotation of gear (1), elastic telescopic part (4) and latch (2) are sequentially arranged in clamping chamber (6), and in the same clamping chamber (6), elastic telescopic part (4) is located in front of latch (2).

2. The engine gear transmission of claim 1, wherein, The elastic telescopic part (4) is a spring, when the gear transmission device is in non-working state, the elastic telescopic part (4) is in natural elongation state or compression state.

3. The engine gear transmission of claim 1, wherein, The clamping chamber (6) is a clamping groove arranged on the side of the gear (1), and the latch (2) is arranged on the outer circumference of the transmission shaft (3).

4. The engine gear transmission of claim 3, wherein, The latch (2) and the transmission shaft (3) are integrally formed.

5. The engine gear transmission of claim 3, wherein, The outer circumferential surface of the latch (2) away from the transmission shaft (3) is arranged separately from the clamping chamber (6).

6. The engine gear transmission of claim 3, wherein, Further comprising a guide sliding assembly located in the clamping chamber (6), the elastic telescopic part (4) is sleeved on the outer circumference of the guide sliding assembly, the guide sliding assembly includes a first sliding member and a second sliding member slidingly matched with the first sliding member, one of the first sliding member and the second sliding member is fixedly connected with the transmission shaft (3), and the other is fixedly connected with the gear (1).

7. The engine gear transmission of claim 3, wherein, The latch (2) is a fan-shaped tooth, and the arc length of the latch (2) gradually increases away from the transmission shaft (3).

8. The engine gear transmission of any one of claims 1-7, wherein, The number of the latch (2) and the clamping chamber (6) is the same, and one-to-one correspondence, the number of the latch (2) and the clamping chamber (6) is at least two.

9. A gear transmission for an engine according to claim 8, characterised in that, The latch (2) is arranged at equal intervals around the outer circumference of the transmission shaft (3).

10. An engine comprising a gear transmission, characterised in that, The gear transmission device is the gear transmission device of any one of claims 1-9.

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