JP2017180553A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and assembly costs in a power transmission device having an oil passage for supplying an oil to multiple lubrication parts.SOLUTION: A power transmission device includes: a belt type non-stage transmission having a transmission belt 7 wound around a pair of pulleys; a case 10 which houses the belt type non-stage transmission; and a belt lubrication tube 14 which is inserted into a main oil passage 12 provided at the case 10, positioned by a fixing member, and used to supply an oil to the transmission belt 7. A branch oil passage 13 which is branched from the main oil passage 12 and extends toward a bearing 11 supporting a differential case is provided at the case 10. A connection part of the main oil passage 12 connected with the branch oil passage 13 is sealed by the belt lubrication tube 14, and the main oil passage 12 communicates with the branch oil passage 13 through an orifice hole 14b provided at the belt lubrication tube 14.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power transmission device, and more particularly to a power transmission device having an oil passage for supplying oil to a plurality of lubricating portions.

  For example, in a power transmission device in which a transmission, a differential gear device, and the like are housed in a common case, oil is supplied from a hydraulic supply source to a main oil passage provided in the case, and branched from the main oil passage. Conventionally, oil is supplied to each lubricating portion through a plurality of branch oil passages extending toward the lubricating portion.

  However, in such a lubrication structure, in order to adjust the amount of oil supplied from each branch oil passage, it is common to attach an orifice plug to each branch oil passage, so a plurality of orifice plugs are required. Thus, there is a problem that the number of parts increases. Further, since there is no space in the branch oil passage, it is difficult to attach the orifice plug except by press-fitting, so that there is a problem that the assembling cost increases.

  In order to solve such a problem, for example, in Patent Document 1, a liquid inflow portion (corresponding to a main oil passage) communicating with a liquid passage (corresponding to a branch oil passage) provided in a case is connected to a liquid pressure supply source. Disclosed is a hydraulic circuit of a transmission in which a tip of a connected pipe is inserted, a discharge hole is provided in a side surface portion of the pipe, and liquid from a hydraulic pressure supply source is supplied to the liquid passage through the discharge hole. Has been.

Japanese Patent Application Laid-Open No. 08-303560

  Certainly, according to the above-mentioned Patent Document 1, since an orifice plug is unnecessary, it seems that an increase in the number of parts and an increase in assembly cost can be suppressed.

  However, in the thing of patent document 1, when a pipe rotates, a communication with an oil path and a branch oil path is not ensured, and it becomes difficult to supply oil to a lubrication part, and there exists a possibility that a lubrication part may seize. There is.

  In order to solve such a problem, in order to suppress the rotation of the pipe, the pipe is provided with a detent or a plurality of discharges in the circumferential direction of the pipe so that the discharge hole and the liquid passage are connected even if the pipe rotates. It is conceivable to provide holes. However, when the pipe is provided with a rotation stopper, there is a problem that the number of parts and the assembly cost increase by the amount of rotation prevention, and when a plurality of discharge holes are provided in the pipe, the pipe is connected to the liquid passage. There is a problem that a large amount of oil leaks from no discharge hole.

  The present invention has been made in view of such a point, and an object of the present invention is to reduce the number of parts and to assemble in a power transmission device having an oil passage for supplying oil to a plurality of lubrication parts. The object is to provide a technique for reducing costs.

  In order to achieve the above object, in the power transmission device according to the present invention, an orifice hole is provided in the oil supply tube already positioned by the fixing member toward the other lubricating portion.

  Specifically, the present invention relates to a belt-type continuously variable transmission having a belt wound around a pair of pulleys, a case accommodating the belt-type continuously variable transmission, and a main oil passage provided in the case And a tube for supplying oil toward the belt, which is inserted into the belt and positioned by a fixing member.

  The case is provided with a branch oil passage that branches off from the main oil passage and extends toward another lubricating portion, and the main oil passage has a connection portion with the branch oil passage at the tube. And is connected to the branched oil passage through an orifice hole provided in the tube.

  According to this configuration, the tube that supplies the oil toward the belt, which is normally positioned by the fixing member, seals the connecting portion with the branch oil passage in the main oil passage, and the tube Since the main oil passage and the branch oil passage are communicated with each other through the orifice hole provided in the nozzle, it is possible to adjust the amount of oil supplied to other lubrication parts without using an orifice plug. Thereby, the orifice plug can be omitted and the number of parts can be reduced, and the assembly cost for press-fitting the orifice plug can be reduced.

  In addition, when a pipe or the like is used to block the connection between the main oil passage and the branch oil passage, a detent is provided to prevent the pipe from rotating, or even if the pipe rotates, the main oil passage and the branch oil passage In order to ensure communication, it is necessary to provide a plurality of orifice holes in the circumferential direction of the pipe. However, according to the present invention using the already positioned tube, the cost of providing a detent can be reduced, and a plurality of orifice holes can be reduced. Since it is not necessary to provide the orifice hole, oil leakage can be suppressed to a small amount.

  As described above, according to the power transmission device of the present invention, the number of parts can be reduced and the assembling cost can be reduced.

It is a figure showing typically the power transmission device concerning the embodiment of the present invention. It is arrow sectional drawing of the II-II line | wire of FIG. It is a perspective view which shows a fixing member typically. It is a figure corresponding to FIG. 2 in the conventional power transmission device.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating a power transmission device 1 according to the present embodiment. This power transmission device 1 includes a torque converter (not shown), a forward / reverse switching device (not shown), a belt-type continuously variable transmission 2 and a reduction gear device 3 in a case 10 constituted by a plurality of case members. And a differential gear device 4 are accommodated, and a plurality of rotating shafts (C1 to C4) are provided. A torque converter, a forward / reverse switching device, a primary pulley 5 of the belt-type continuously variable transmission 2 and the like are disposed on the first shaft C1, and a secondary pulley 6 of the belt-type continuously variable transmission 2 and the like on the second shaft C2. The reduction gear device 3 is arranged on the third axis C3, and the differential gear device 4 is arranged on the fourth axis C4.

  In the power transmission device 1 configured as described above, the rotational driving force output from the engine (not shown) transmits the power through the hydraulic oil, and the direction of the power is set to the forward direction and the reverse direction. Is transmitted to the belt-type continuously variable transmission 2 via a forward / reverse switching device.

  The belt type continuously variable transmission 2 includes a primary pulley 5, a secondary pulley 6, and a transmission belt 7 wound around the primary pulley 5 and the secondary pulley 6. The transmission belt 7 is composed of a plurality of metal elements 8 arranged in the circumferential direction and two hoops 9 for bundling the plurality of elements 8 (see FIG. 2). The belt-type continuously variable transmission 2 can continuously change the transmission gear ratio by changing the winding radius of the transmission belt 7 by changing the width of the V groove of the primary pulley 5 and the secondary pulley 6. It is configured.

  The rotational driving force output from the belt-type continuously variable transmission 2 is output to the differential gear device 4 via the reduction gear device 3 that reduces the rotation, and is transmitted to the left and right wheels (not shown). Although not shown, the differential gear device 4 includes a differential case, a ring gear, a pinion gear, a side gear, a pinion shaft, and the like. Both ends of the differential case are supported by a pair of bearings 11 in the case 10. ing.

  2 is a cross-sectional view taken along line II-II in FIG. In the power transmission device 1 configured as described above, it is necessary to supply lubricating oil to each lubricating portion. However, as shown in FIG. 2, the main transmission for supplying oil to the transmission belt 7 is provided in the case 10. An oil passage 12 and a branch oil passage 13 for supplying oil to the bearing 11 that supports the differential case are provided.

  A belt lubrication tube 14 for supplying oil toward the transmission belt 7 is inserted into the main oil passage 12. As indicated by the black arrows in FIG. 2, the oil supplied to the main oil passage 12 from a hydraulic supply source (not shown) is transmitted from the tip end portion 14 a of the belt lubrication tube 14 bent toward the transmission belt 7. 7 is supplied. In the belt-type continuously variable transmission 2, it is necessary to lubricate the engagement portion of the element 8 that is engaged with the sheave surfaces of the primary pulley 5 and the secondary pulley 6. As shown in FIG. 3, the belt lubrication tube 14 is positioned by the fixing member 15.

  On the other hand, the branch oil passage 13 branches from the main oil passage 12 and extends toward the bearing (other lubricating portion) 11. A part of the oil supplied to the main oil passage 12 is supplied to the bearing 11 through the branch oil passage 13 as shown by the white arrow in FIG.

  Here, in order to make the power transmission device 1 of this embodiment easy to understand, a conventional power transmission device will be described with reference to FIG.

  FIG. 4 is a diagram corresponding to FIG. 2 in a conventional power transmission device. Also in the conventional power transmission device, as in the power transmission device 1 of the present embodiment, the case 110 has a main oil passage 112 for supplying oil to the transmission belt 107 and a bearing 111 as shown in FIG. And a branch oil passage 113 for supplying oil to the main body. In addition, a belt lubrication tube 114 for supplying oil toward the transmission belt 107 is inserted into the main oil passage 112, and a fixing member (see FIG. 5) is used to fix the direction of the tip portion 114a of the belt lubrication tube 114. The belt lubrication tube 114 is positioned by the same as in the power transmission device 1 of the present embodiment.

  However, the conventional power transmission device has a problem that the number of parts increases because the orifice plug 116 is attached to the branch oil passage 113 in order to adjust the amount of oil supplied from the branch oil passage 113. Further, since there is no space in the branch oil passage 113, it is difficult to attach the orifice plug 116 except by press-fitting, so that there is a problem that the assembling cost increases.

  Therefore, in the power transmission device 1 of the present embodiment, as shown in FIG. 2, the connecting portion of the main oil passage 12 with the branch oil passage 13 is sealed by the belt lubrication tube 14, and the orifice hole 14 b is formed in the belt lubrication tube 14. The main oil passage 12 and the branch oil passage 13 are communicated with each other through the orifice hole 14b. More specifically, by extending the belt lubrication tube 14 as compared with the prior art, the connection portion between the main oil passage 12 and the branch oil passage 13 is sealed, and the branch oil passage 13 in the belt lubrication tube 14 is blocked. An orifice hole 14b having a diameter smaller than that of the branch oil passage 13 is formed.

  According to this configuration, since the main oil passage 12 and the branch oil passage 13 communicate with each other via the orifice hole 14b, the amount of oil supplied to the bearing 11 that supports the differential case without using the orifice plug 116. Can be adjusted. Therefore, the orifice plug 116 can be omitted to reduce the number of parts, and the assembly cost for press-fitting the orifice plug 116 can be reduced.

  Further, for example, when the connection portion of the main oil passage 12 with the branch oil passage 13 is closed with an unpositioned pipe, a rotation stopper is provided to suppress the rotation of the pipe, or the main oil passage even when the pipe rotates. Although it is necessary to provide a plurality of orifice holes in the circumferential direction of the pipe so that the communication between the branch oil passage 12 and the branch oil passage 13 is ensured, this embodiment uses the belt lubrication tube 14 already positioned by the fixing member 15. In the configuration, since it is not necessary to perform positioning with a new fixing member, it is possible to reduce the cost of providing a rotation stopper, and it is not necessary to provide a plurality of orifice holes, so that oil leakage can be suppressed to a small amount. .

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the above embodiment, the present invention is applied to the branch oil passage 13 for supplying oil to the bearing 11 that supports the differential case. However, if the already-positioned belt lubrication tube 14 is used, the present invention is not limited thereto. The present invention may be applied to a branched oil passage that branches off from the main oil passage 12 and extends toward the lubricating portion other than the bearing 11.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  According to the present invention, since the number of parts can be reduced and the assembly cost can be reduced, a power transmission device having an oil passage for supplying oil to a plurality of lubricating parts including a belt of a continuously variable transmission is provided. It is extremely beneficial to apply.

DESCRIPTION OF SYMBOLS 1 Power transmission device 2 Belt type continuously variable transmission 5 Primary pulley 6 Secondary pulley 7 Transmission belt 10 Case 11 Bearing (other lubrication part)
12 Main oil passage 13 Branch oil passage 14 Belt lubrication tube 14b Orifice hole 15 Fixing member

Claims (1)

A belt-type continuously variable transmission having a belt wound around a pair of pulleys, a case for housing the belt-type continuously variable transmission, and inserted into a main oil passage provided in the case and positioned by a fixing member A power transmission device comprising a tube for supplying oil toward the belt,
The case is provided with a branch oil passage that branches off from the main oil passage and extends toward the other lubrication part,
The main oil passage has a connecting portion with the branch oil passage sealed by the tube and communicates with the branch oil passage through an orifice hole provided in the tube. Transmission device.

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