JPH063258Y2 - Pipe fitting with oil temperature switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a case having a hydraulic oil passage and a tube (for example, a transaxle case accommodating a power transmission device of an automobile and a tube connected to an oil cooler). TECHNICAL FIELD The present invention relates to a pipe joint used for connecting an oil temperature switch, and particularly to a pipe joint with an oil temperature switch, which is provided with an oil temperature switch that operates by detecting the temperature of hydraulic oil.

[Prior art]

This type of pipe joint 1 is conventionally arranged as shown in FIG.
The inflow hole 1a is screwed and attached to the case 2 having a hydraulic oil passage (not shown).
B has a bending angle of zero with respect to the inflow hole 1a (on the same axis), and the oil temperature switch mounting hole 1c has a bending angle of substantially right angle with respect to the inflow hole 1a. Further, the oil temperature switch 3 uses the inner end projection 3a as a temperature sensing portion to form an adapter 4 (this adapter 4 prevents the oil temperature switch 3 from interfering with the side wall 2a of the case 2 when the fitting 1 is screwed into the case 2. 3 is removed from the pipe joint 1 together with the mounting hole 1c
The inner end projection 3a is projected into the communication passage that connects the inflow hole 1a and the outflow hole 1b.

[Problems to be solved by the device]

Therefore, the inner end projection 3a of the oil temperature switch 3 obstructs the flow of the hydraulic oil to cause turbulence, resulting in a large flow path resistance, and in some cases, the oil temperature cannot be accurately measured.

The present invention has been made to address the above problems, and an object of the present invention is to provide a pipe joint with an oil temperature switch that can improve the flow of hydraulic oil and improve the accuracy of oil temperature measurement.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, the pipe joint with an oil temperature switch is connected with an attachment hole for attaching the oil temperature switch at an acute bending angle with respect to the inflow hole, and an outflow hole for attaching a tube. Is connected to the mounting hole with a bending angle substantially at a right angle, and the oil temperature switch exposes an inner end surface substantially orthogonal to the mounting hole as a temperature sensing portion at a connecting portion between the mounting hole and the outflow hole, The inflow hole portion is screwed and attached to a case having a hydraulic oil passage.

[Effect of the device]

The pipe joint with oil temperature switch configured as above is screwed into the case that has the hydraulic oil passage in the inlet hole, and is used with the tube attached to the outlet hole. When the hydraulic oil flows from the hydraulic oil passage of the case into the inflow hole, the hydraulic oil flows from the inflow hole into the mounting hole and flows toward the inner end surface of the oil temperature switch.
After flowing along the inner end face, it flows into the outflow hole and then into the tube.

By the way, in the pipe joint with the oil temperature switch, the oil temperature switch has an inner end surface substantially orthogonal to the mounting hole as a temperature sensing portion and does not project into the passage, and moreover, the working oil is entirely on the inner end surface of the oil temperature switch. Since it flows toward the inner end face and touches the inner end face without causing turbulence, the flow of hydraulic oil is better than before and the loss of flow can be reduced, and the oil temperature can be measured. The accuracy can be improved and the oil temperature switch can always be operated accurately.

Further, in the pipe fitting with the oil temperature switch, since the mounting hole to which the oil temperature switch is mounted is connected to the inflow hole with a sharp bending angle, the inflow hole in the state where the oil temperature switch is mounted to the mounting hole is The length from the axis to the outer end of the oil temperature switch is shorter than before. Therefore, even if the side wall of the case to which the pipe joint with the oil temperature switch is attached is close to the pipe joint, the oil temperature switch is attached to the pipe joint by setting the bending angle (acute angle) appropriately. In this state, the pipe joint can be screwed into the case without interfering with the case, and the cost can be reduced by eliminating the conventionally required adapter.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

The pipe joint 10 shown in FIG. 1 has an inflow hole 10a and a mounting hole 1
0b and an outflow hole 10c, and a male screw portion 10d provided on the outer periphery of the tip of the inflow hole 10a at the transaxle case (the power transmission device of the vehicle is housed inside).
11 is screwed into an internal thread portion 11b provided at the outer end of the hydraulic oil passage 11a, and is fluid-tightly fixed to the case 11 by using an oil seal O, a seal ring 12, and a lock nut 13 in the set state shown in the drawing.

Therefore, in this embodiment, the mounting hole 10b is connected to the inflow hole 10a at the inner end with the bending angle α1 as an acute angle, and the oil temperature switch 14 is connected to the female screw portion 10b1 provided at the outer end thereof. It is mounted in a liquid-tight manner via a seal 15. Further, the outflow hole 10c has a bending angle of substantially right angle with respect to the mounting hole 10b, and the bending angle α2 with respect to the inflow hole 10a.
Is connected to the intermediate portion of the mounting hole 10b with an acute angle, and the tube 1 is attached to the female screw portion 10c1 provided at the outer end thereof.
6 is mounted in a liquid-tight manner by a lock nut 17.
The tube 16 is connected to an oil cooler (not shown).

Further, in this embodiment, the oil temperature switch 14 has an inner end surface 14a that is substantially orthogonal to the mounting hole 10b as a temperature sensing portion, and this inner end surface 14a is a connecting portion (T-shaped portion) between the mounting hole 10b and the outflow hole 10c. Exposed to. The switch operating portion of the oil temperature switch 14 (the portion that opens and closes based on the oil temperature sensed at the inner end surface 14a) is not shown, but it is provided in the mounting screw portion 14b as in the conventional switch. The opening / closing operation signal obtained at this switch operation portion is taken out through the connector 18.

In the present embodiment configured as described above, the case 11
When the working oil flows from the working oil passage 11a into the inflow hole 10a of the pipe joint 10, the working oil flows from the inflow hole 10a into the mounting hole 10b and flows toward the inner end surface 14a of the oil temperature switch 14, After flowing along the end face 14a, it flows into the outflow hole 10c and then into the tube 16.

By the way, in the pipe fitting with the oil temperature switch, the oil temperature switch 14 has an inner end surface 14a substantially orthogonal to the mounting hole 10b.
Is a temperature sensing unit and does not project into the passage, and moreover, all the hydraulic oil flows toward the inner end surface 14a of the oil temperature switch 14 and touches on the inner end surface 14a without causing turbulence. The flow of hydraulic oil is better than that of the conventional one shown in FIG. 2 and the loss of flow can be reduced, and the accuracy of oil temperature measurement is improved to improve the oil temperature switch 1.
4 can always be operated correctly.

Further, in the pipe joint with the oil temperature switch, the mounting hole 10b in which the oil temperature switch 14 is mounted is connected to the inflow hole 10a with the bending angle α1 being an acute angle, so the oil temperature switch 14 is mounted in the mounting hole 10b. In this state, the length l from the axis L of the inflow hole 10a to the outer end of the oil temperature switch 14 becomes shorter than in the conventional case. Therefore, the side wall 11 of the case 11 to which the pipe joint with the oil temperature switch is attached
Even if c is close to the pipe joint 10 as shown in the drawing, the pipe joint 10 is still attached with the oil temperature switch 14 attached.
Can be screwed in and attached to the case 11 without interfering with the case 11, and it is possible to reduce the cost by eliminating the conventionally required adapter.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a pipe joint with an oil temperature switch according to the present invention, and FIG. 2 is a sectional view showing an example of a conventional pipe joint with an oil temperature switch. Explanation of symbols 10 ... Pipe joint, 10a ... Inflow hole, 10b ... Mounting hole, 10c ... Outflow hole, 11 ... Case, 11a ... Hydraulic oil passage, 14 ... Oil temperature switch, 14a. End face,
α1 ... Bending angle.

Claims (1)

[Scope of utility model registration request] 1. An attachment hole to which an oil temperature switch is attached is connected to an inflow hole with a bending angle of an acute angle, and an outflow hole to which a tube is attached is connected to the installation hole with a bending angle of substantially right angles, and The oil temperature switch has an inner end surface that is substantially orthogonal to the mounting hole exposed as a temperature sensing portion at the connecting portion between the mounting hole and the outflow hole, and is screwed into a case having a hydraulic oil passage at the inflow hole portion for mounting. Pipe joint with oil temperature switch.