TWI385327B - Hydraulic tensioner - Google Patents

Description

Hydraulic tensioning device

The present invention relates to a hydraulic tensioning device, and more particularly to a hydraulic tensioning device for use in a powerplant or transmission.

Hydraulic tensioning devices are typically used in power systems or transmission systems. For example, a circulating elastic member for transmitting power of a drive shaft of a power system, in order to smooth the transmission of power and avoid vibration caused by a change in tension of the circulating elastic member, a hydraulic tension is usually provided on the slack side of the circulating elastic member. The device is connected to the hydraulic pressure tank through a hydraulic passage to form a hydraulic tensioning device group with a hydraulic pump (for example, an oil pump), thereby automatically adjusting the tension of the circulating elastic member.

In US Patent No. 5,346,436, Francis J. Hunter et al. disclose that a general hydraulic tensioning device includes a body, a piston, an air valve, and a spring, wherein the air valve functions primarily to provide a passage for communicating the through hole of the piston tip and the piston depression. The space in the section, through the passage of the air valve, allows the gas in the hydraulic oil contained between the piston and the body to be discharged outside the hydraulic tensioning device. The main technical feature is the design of the passage on the air valve, wherein the passage is provided on the top surface of the air valve, and the bending geometry is used to increase the distance of the passage on the air valve. However, the channel design of this air valve makes the gas discharge less smooth.

The object of the present invention is to provide a hydraulic tensioning device, wherein a third recessed portion is disposed on a top surface of an air valve of the hydraulic tensioning device, and a passage portion connecting the third recessed portion and the first through hole of the piston to allow hydraulic oil The gas contained in the gas is discharged more smoothly, thereby increasing the distance that the hydraulic oil leaks outside the hydraulic tensioning device, and reducing excessive hydraulic oil leakage to the outside of the hydraulic tensioning device.

The invention has the advantages that the top surface of the air valve can be operated without having to cooperate with the top surface of the recessed portion of the piston, so that the air valve can be modularly produced and is suitable for various types of tensioning devices.

According to an embodiment of the invention, a hydraulic tensioning device is provided. The hydraulic tensioning device includes a body having a first recessed portion, a piston having a second recessed portion on the bottom surface, an air valve accommodated in the second recessed portion, an elastic member, a hydraulic passage portion, and a check valve. The first recess is for receiving a liquid that provides hydraulic pressure. The top surface of the piston has a first through hole, wherein the piston is movably received in the first recess and protrudes beyond the first recess. The air valve has opposite top and bottom surfaces, wherein the top surface includes at least one third recess portion and at least one passage portion communicating with the third recess portion and the first through hole of the piston, and the bottom surface of the third recess portion is concave And at least one second through hole for connecting the third recess and the bottom surface of the air valve. One end of the elastic member is in contact with the air valve. The hydraulic passage is configured to communicate with the first recess of the body and the supply of the liquid. A check valve is used to prevent backflow of liquid to the supply.

In the following description, similar elements will be denoted by the same reference numerals.

Please refer to FIG. 1A, which is a cross-sectional view showing a hydraulic tensioning device according to an embodiment of the present invention. The hydraulic tensioning device 100 includes a body 102, a piston 104, an air valve 200, an elastic member 108, and a check valve 110, and the body 102 further has a hydraulic passage 112 therein. The hydraulic tensioning device 100 is connected to a hydraulic line (not shown) by a hydraulic passage 112, wherein the hydraulic line is in communication with a hydraulic groove (not shown), and the hydraulic groove is connected to a hydraulic pump (not shown). Connected to form a hydraulic tensioning device group. In the hydraulic tensioning device group, liquid (for example, hydraulic oil) in the hydraulic pressure tank is mainly supplied to the body 102 of the hydraulic tensioning device 100 through the hydraulic line and the hydraulic passage 112 by means of a hydraulic pump.

In the hydraulic tensioning device 100, the body 102 has a first recessed portion 102a. In this embodiment, the first recessed portion 102a has a bottom surface 102aa and a side surface 102ab, wherein the first recessed portion 102a is used to accommodate the aforementioned hydraulic pressure. The liquid in the tank, which is primarily used to transfer the pressure of the hydraulic pump, thereby providing the thrust required by the piston 104.

In this embodiment, the bottom surface 104a of the piston 104 has a second recess 104b, wherein the second recess 104b includes a bottom surface 104ba and a side surface 104bb, and the top surface 104c of the piston 104 has a first through hole 104d, wherein the piston 104 is accommodated. In the first recessed portion 102a of the body 102, the second recessed portion 104b of the piston 104 and the first recessed portion 102a of the body 102 together form a space for accommodating the liquid from the hydraulic groove. In addition, the top surface 104c of the piston 104 can be Projecting beyond the first recess 102a of the body 102. When the piston 104 is pushed by the liquid contained in the first recess 102a of the body 102, the piston 104 can move along the axial direction of the first recess 102a of the body 102 away from the body 102, thereby maintaining the piston The tension of the cyclic elastic member (not shown) that the top surface 104c of 104 contacts.

In the present embodiment, the air valve 200 is housed in the second recess 104b of the piston 104.

Please refer to FIGS. 1B and 1C, wherein FIG. 1B is a top view of the air valve 200 of FIG. 1A, and FIG. 1C is a cross-sectional view taken along line AA' of FIG. 1B. The air valve 200 has an opposite top surface 202 and a bottom surface 204 and a side surface 205. The top surface 202 is provided with at least a third recess portion 206 and a channel portion 212, wherein the channel portion 212 is configured to communicate with the third recess portion. 206 and the first through hole 104d of the piston 104.

In the present embodiment, the third recessed portion 206 is annular, but in other embodiments, the third recessed portion 206 may have other geometric shapes, such as a polygon or the like. The third recessed portion 206 is disposed around the top surface 202 of the air valve 200, and the bottom surface of the third recessed portion 206 is regularly provided with six second through-circle of the third recessed portion 206 in this embodiment. The hole 210 and the second through hole 210 are configured to communicate the third recess 206 with the bottom surface 204 of the air valve 200.

When the top surface 202 and the side surface 205 of the air valve 200 and the bottom surface 104ba of the second recessed portion 104b of the piston 104 are closely fitted to the side surface 104bb, the gas contained in the liquid contained in the first recess portion 102a is sequentially passed through the air valve. The second through hole 210 of the bottom surface 204 of the 200, and then to the third recessed portion 206, passes through the passage portion 212 and is discharged outside the hydraulic tensioning device 100 via the first through hole 104d of the piston 104.

As shown in FIG. 1A, in the present embodiment, the elastic member 108 is a spring, but is not limited thereto. The elastic member 108 is received in the second recess 104b of the piston 104. One end of the elastic member 108 is in contact with the air valve 200, and the other end is placed in the second recess 104b of the piston 104. The primary function of the resilient member 108 is to provide a substantial thrust of the piston 104 thereby maintaining the tension of a circulating resilient member (not shown) that is in contact with the top surface 104c of the piston 104.

2A and 2B are respectively a top view of an air valve 300 according to another embodiment of the present invention, and a cross-sectional view taken along line BB' of FIG. 2A. In this embodiment, the structure, the change, and the relative relationship between the air valve 300 and the piston are similar to those of the air valve 200. Therefore, only the differences will be described below, and similar parts will not be described again. In order to further improve the smoothness of the gas contained in the liquid flowing through the first through hole 104d of the piston 104, the air valve 300 is further provided with a fourth recessed portion 208 corresponding to the air valve 200, and a fourth recessed portion 208 is added. In the present embodiment, the fourth recessed portion 208 is concentric with the third recessed portion 206 and has a smaller diameter than the third recessed portion 206. In addition, the fourth recessed portion 208 is also identical to the third recessed portion 206 . The second through hole 210 surrounding the fourth recessed portion 208 is regularly provided on the bottom surface 304 , and the fourth recessed portion 208 and the third recessed portion 206 . The fourth recessed portion 208 and the third recessed portion 206 have the same top surface 302, but one of the third recessed portions 206 has a side height that is higher than one of the fourth recessed portions 208. A channel portion 212 is formed between the third recess portion 206 and the fourth recess portion 208 and the top surface 302 of the air valve 300. The channel portion 212 is configured to communicate with the fourth recess portion 208 and the third recess portion 206, and Consistently perforated 104d connected. The height of the sidewall shared between the third recessed portion 206 and the fourth recessed portion 208 is different from the other sidewall of the fourth recessed portion 208 and lower than the top surface 302 of the air valve 300.

Please refer to FIGS. 3A and 3B, which are respectively a top view of an air valve 400 according to another embodiment of the present invention, and a cross-sectional view taken along line CC' of FIG. 3A. In this embodiment, the structure, the change, and the relative relationship between the air valve 400 and the piston are similar to those of the air valve 300. Therefore, only the differences will be described below, and similar parts will not be described again. In the air valve 400, the top surface between the third recessed portion 206 and the fourth recessed portion 208 is flush with the top surface 402 of the air valve 400 and closely mates with the bottom surface 104ba of the second recessed portion 104b of the piston. The partial top surface 402 between the third recessed portion 206 and the fourth recessed portion 208 is recessed to form a rectangular groove shape, and communicates with the third recessed portion 206 and the fourth recessed portion 208 and communicates with 104d.

4A and 4B are respectively a top view of an air valve 500 according to another embodiment of the present invention, and a cross-sectional view taken along line DD' of Fig. 4A. In this embodiment, the structure, the change, and the relative relationship between the air valve 500 and the piston are similar to those of the air valve 400. Therefore, only the differences will be described below, and similar parts will not be described again. In the air valve 500, the outer periphery of the third recessed portion 206 is substantially circular and annular, and the inner periphery is formed by a plurality of arcs combined to form a geometry (but not limited to this shape). The purpose is to increase the space of the third recessed portion 206 so that the gas contained in the liquid is easily accumulated there. The fourth recessed portion 208 is disposed at the center of the air valve 500 and directly communicates with the first through hole 104d, and the bottom surface thereof is recessed to a lesser extent than the third recessed portion 206. In other specific embodiments, the fourth recessed portion The bottom portion of the portion 208 may also be recessed to a depth deeper than the third recess portion 206.

In addition, the fourth recessed portion 208 is not provided with the second through hole 210 in the bottom surface in the embodiment, and in the embodiment, the top surface 502 between the fourth recessed portion 208 and the third recessed portion 206 forms a channel. The portion 212 is configured to connect the third recess portion 206 and the fourth recess portion 208. The channel portion 212 is in the shape of a groove between the third recessed portion 206 and the fourth recessed portion 208, so that the gas contained in the liquid collected in the third recessed portion 206 can only pass through the third recessed portion 206. The specific position of the inner periphery enters the channel portion 212, enters the fourth recess portion 208, and is finally discharged outside the hydraulic tensioning device 100 via the first through hole 104d of the piston 104.

Referring to FIG. 4C, in the embodiment, the air valve further protrudes from the bottom surface 504 with a protrusion 214, and the protrusion 214 is seated in the second recess 104b of the piston 104 as shown in FIG. . The projection 214 mainly functions to reduce the space between the second recess 104b of the piston 104 and the first recess 102a of the body 102, thereby reducing the time required to establish the oil pressure.

The features of the various embodiments have been described above in a manner to provide a more detailed description of the embodiments. Those skilled in the art will recognize that other procedures and structures may be constructed or modified to achieve the same objectives and/or advantages of the embodiments described herein. A person skilled in the art can also appreciate that various modifications, substitutions, and refinements can be made without departing from the spirit and scope of the disclosure, and without departing from the spirit and scope of the disclosure.

100. . . Hydraulic tensioning device

102. . . Ontology

102a. . . First depression

102aa. . . Bottom

102ab. . . side

104. . . piston

104a. . . Bottom

104b. . . Second depression

104ba. . . Bottom

104bb. . . side

104c. . . Top surface

104d. . . First through hole

108. . . Elastic member

110. . . Check valve

112. . . Hydraulic passage

200. . . Air valve

202. . . Top surface

204. . . Bottom

205. . . side

206. . . Third depression

208. . . Fourth depression

210. . . Second through hole

212. . . Channel department

214. . . Protrusion

300. . . Air valve

302. . . Top surface

304. . . Bottom

400. . . Air valve

402. . . Top surface

500. . . Air valve

502. . . Top surface

504. . . Bottom

For a better understanding of the present invention, reference is made to the above detailed description and the accompanying drawings. It is emphasized that, in accordance with the standard of the industry, the various features in the drawings are not to scale. In fact, the dimensions of the various features may be arbitrarily enlarged or reduced in order to clearly illustrate the above embodiments. The relevant schema description is as follows.

1A is a schematic cross-sectional view showing a hydraulic tensioning device according to an embodiment of the present invention.

Fig. 1B is a schematic plan view showing the air valve of Fig. 1A.

Fig. 1C is a schematic cross-sectional view taken along line AA' of Fig. 1B.

2A is a schematic top plan view of an air valve according to another embodiment of the present invention.

Fig. 2B is a schematic cross-sectional view taken along line BB' of Fig. 2A.

3A is a schematic top plan view of an air valve according to another embodiment of the present invention.

Fig. 3B is a schematic cross-sectional view taken along line CC' of Fig. 3A.

4A is a schematic top plan view of an air valve in accordance with another embodiment of the present invention.

Fig. 4B is a schematic cross-sectional view taken along line DD' of Fig. 4A.

Figure 4C is a cross-sectional view showing an air valve according to another embodiment of the present invention.

100. . . Hydraulic tensioning device

102. . . Ontology

102a. . . First depression

102aa. . . Bottom

102ab. . . side

104. . . piston

104a. . . Bottom

104b. . . Second depression

104ba. . . Bottom

104bb. . . side

104c. . . Top surface

104d. . . First through hole

108. . . Elastic member

110. . . Check valve

112. . . Hydraulic passage

200. . . Air valve

205. . . side

206. . . Third depression

210. . . Second through hole

212. . . Channel department

Claims (8)

A hydraulic tensioning device includes: a body having a first recessed portion, wherein the first recessed portion is configured to receive a liquid for providing hydraulic pressure; and a piston having a second recessed portion on a bottom surface thereof, the piston The top mask has a first through hole, wherein the piston is movably received in the first recess, and the top surface of the piston protrudes beyond the first recess; an air valve a second recessed portion of the piston, wherein the air valve has a top surface and a bottom surface, the air valve includes: a third recess, wherein the third recess is recessed in the air valve a bottom surface of the third recessed portion is provided with at least one second through hole for communicating the third recess portion and the bottom surface of the air valve; and at least one channel portion, wherein The passage portion is configured to communicate the third recess portion with the first through hole of the piston. The hydraulic tensioning device of claim 1, wherein the top surface of the air valve is recessed with a fourth recess that communicates with the passage portion. The hydraulic tensioning device of claim 2, wherein the bottom surface of the fourth recess is provided with at least one of the second through holes. The hydraulic tensioning device of claim 2, wherein the fourth recess has a degree of depression that is the same, deeper or shallower than the third recess. The hydraulic tensioning device of claim 2, wherein a side sill height of the third recess is different from a side wall of the fourth recess and lower than the top surface of the air valve. The hydraulic tensioning device of claim 2, 3 or 4, wherein the geometric shape of the inner periphery or the outer periphery of the third recess or the fourth recess is selected from a ring shape and a plurality of A group of geometric shapes or geometric shapes of polygons formed by arcs. The hydraulic tensioning device of claim 6, wherein the top surface portion of the air valve between the third recess portion and the fourth recess portion and the second recess portion of the piston The bottom surface is closely matched, and the channel portion is formed in at least one groove shape between the third recess portion and the fourth recess portion. The hydraulic tensioning device of claim 1, wherein the bottom surface of the air valve protrudes from a protrusion.